--- _id: '55999' abstract: - lang: eng text: Clean hydrogen is a key aspect of carbon neutrality, necessitating robust methods for monitoring hydrogen concentration in critical infrastructures like pipelines or power plants. While semiconducting metal oxides such as In2O3 can monitor gas concentrations down to the ppm range, they often exhibit cross-sensitivity to other gases like H2O. In this study, we investigated whether cyclic optical illumination of a gas-sensitive In2O3 layer creates identifiable changes in a gas sensor´s electronic resistance that can be linked to H2 and H2O concentrations via machine learning. We exposed nanostructured In2O3 with a large surface area of 95 m2 g-1 to H2 concentrations (0-800 ppm) and relative humidity (0-70%) under cyclic activation utilizing blue light. The sensors were tested for 20 classes of gas combinations. A support vector machine achieved classification rates up to 92.0%, with reliable reproducibility (88.2 ± 2.7%) across five individual sensors using 10-fold cross-validation. Our findings suggest that cyclic optical activation can be used as a tool to classify H2 and H2O concentrations. article_type: original author: - first_name: 'Dominik ' full_name: 'Baier, Dominik ' last_name: Baier - first_name: 'Alexander ' full_name: 'Krüger, Alexander ' last_name: Krüger - first_name: 'Thorsten ' full_name: 'Wagner, Thorsten ' last_name: Wagner - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger citation: ama: 'Baier D, Krüger A, Wagner T, Tiemann M, Weinberger C. Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O. Chemosensors. 2024;12(9):178. doi:10.3390/chemosensors12090178' apa: 'Baier, D., Krüger, A., Wagner, T., Tiemann, M., & Weinberger, C. (2024). Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O. Chemosensors, 12(9), 178. https://doi.org/10.3390/chemosensors12090178' bibtex: '@article{Baier_Krüger_Wagner_Tiemann_Weinberger_2024, title={Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O}, volume={12}, DOI={10.3390/chemosensors12090178}, number={9}, journal={Chemosensors}, publisher={MDPI}, author={Baier, Dominik and Krüger, Alexander and Wagner, Thorsten and Tiemann, Michael and Weinberger, Christian}, year={2024}, pages={178} }' chicago: 'Baier, Dominik , Alexander Krüger, Thorsten Wagner, Michael Tiemann, and Christian Weinberger. “Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O.” Chemosensors 12, no. 9 (2024): 178. https://doi.org/10.3390/chemosensors12090178.' ieee: 'D. Baier, A. Krüger, T. Wagner, M. Tiemann, and C. Weinberger, “Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O,” Chemosensors, vol. 12, no. 9, p. 178, 2024, doi: 10.3390/chemosensors12090178.' mla: 'Baier, Dominik, et al. “Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O.” Chemosensors, vol. 12, no. 9, MDPI, 2024, p. 178, doi:10.3390/chemosensors12090178.' short: D. Baier, A. Krüger, T. Wagner, M. Tiemann, C. Weinberger, Chemosensors 12 (2024) 178. date_created: 2024-09-03T13:49:42Z date_updated: 2025-11-26T12:14:21Z ddc: - '540' department: - _id: '2' - _id: '307' doi: 10.3390/chemosensors12090178 file: - access_level: closed content_type: application/pdf creator: cweinber date_created: 2024-09-03T13:58:18Z date_updated: 2024-09-03T13:58:18Z file_id: '56000' file_name: chemosensors-12-00178.pdf file_size: 3275869 relation: main_file success: 1 file_date_updated: 2024-09-03T13:58:18Z has_accepted_license: '1' intvolume: ' 12' issue: '9' keyword: - resistive gas sensor - chemiresistor - semiconductor - metal oxide - In2O3 - mesoporous - hydrogen - humidtiy - machine learning - sustainable language: - iso: eng main_file_link: - open_access: '1' url: https://www.mdpi.com/2227-9040/12/9/178 oa: '1' page: '178' publication: Chemosensors publication_identifier: issn: - 2227-9040 publication_status: published publisher: MDPI quality_controlled: '1' status: public title: 'Gas Sensing with Nanoporous In2O3 under Cyclic Optical Activation: Machine Learning-Aided Classification of H2 and H2O' type: journal_article user_id: '11848' volume: 12 year: '2024' ... --- _id: '56947' abstract: - lang: eng text: Pore engineering is commonly used to alter the properties of metal–organic frameworks. This is achieved by incorporating different linker molecules (L) into the structure, generating isoreticular frameworks. CPO-27, also named MOF-74, is a prototypical material for this approach, offering the potential to modify the size of its one-dimensional pore channels and the hydrophobicity of pore walls using various linker ligands during synthesis. Thermal activation of these materials yields accessible open metal sites (i.e., under-coordinated metal centers) at the pore walls, thus acting as strong primary binding sites for guest molecules, including water. We study the effect of the pore size and linker hydrophobicity within a series of Ni2+-based isoreticular frameworks (i.e., Ni2L, L = dhtp, dhip, dondc, bpp, bpm, tpp), analyzing their water sorption behavior and the water interactions in the confined pore space. For this purpose, we apply water vapor sorption analysis and Fourier transform infrared spectroscopy. In addition, defect degrees of all compounds are determined by thermogravimetric analysis and solution 1H nuclear magnetic resonance spectroscopy. We find that larger defect degrees affect the preferential sorption sites in Ni2dhtp, while no such indication is found for the other materials in our study. Instead, strong evidence is found for the formation of water bridges/chains between coordinating water molecules, as previously observed for hydrophobic porous carbons and mesoporous silica. This suggests similar sorption energies for additional water molecules in materials with larger pore sizes after saturation of the primary binding sites, resulting in more bulk-like water arrangements. Consequently, the sorption mechanism is driven by classical pore condensation through H-bonding anchor sites instead of sorption at discrete sites. article_type: original author: - first_name: Marvin full_name: Kloß, Marvin last_name: Kloß - first_name: Lara full_name: Schäfers, Lara last_name: Schäfers - first_name: Zhenyu full_name: Zhao, Zhenyu last_name: Zhao - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Hans full_name: Egold, Hans id: '101' last_name: Egold - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 citation: ama: 'Kloß M, Schäfers L, Zhao Z, Weinberger C, Egold H, Tiemann M. Water Sorption on Isoreticular CPO-27-Type MOFs: From Discrete Sorption Sites to Water-Bridge-Mediated Pore Condensation. Nanomaterials. 2024;14(22):1791. doi:10.3390/nano14221791' apa: 'Kloß, M., Schäfers, L., Zhao, Z., Weinberger, C., Egold, H., & Tiemann, M. (2024). Water Sorption on Isoreticular CPO-27-Type MOFs: From Discrete Sorption Sites to Water-Bridge-Mediated Pore Condensation. Nanomaterials, 14(22), 1791. https://doi.org/10.3390/nano14221791' bibtex: '@article{Kloß_Schäfers_Zhao_Weinberger_Egold_Tiemann_2024, title={Water Sorption on Isoreticular CPO-27-Type MOFs: From Discrete Sorption Sites to Water-Bridge-Mediated Pore Condensation}, volume={14}, DOI={10.3390/nano14221791}, number={22}, journal={Nanomaterials}, publisher={MDPI AG}, author={Kloß, Marvin and Schäfers, Lara and Zhao, Zhenyu and Weinberger, Christian and Egold, Hans and Tiemann, Michael}, year={2024}, pages={1791} }' chicago: 'Kloß, Marvin, Lara Schäfers, Zhenyu Zhao, Christian Weinberger, Hans Egold, and Michael Tiemann. “Water Sorption on Isoreticular CPO-27-Type MOFs: From Discrete Sorption Sites to Water-Bridge-Mediated Pore Condensation.” Nanomaterials 14, no. 22 (2024): 1791. https://doi.org/10.3390/nano14221791.' ieee: 'M. Kloß, L. Schäfers, Z. Zhao, C. Weinberger, H. Egold, and M. Tiemann, “Water Sorption on Isoreticular CPO-27-Type MOFs: From Discrete Sorption Sites to Water-Bridge-Mediated Pore Condensation,” Nanomaterials, vol. 14, no. 22, p. 1791, 2024, doi: 10.3390/nano14221791.' mla: 'Kloß, Marvin, et al. “Water Sorption on Isoreticular CPO-27-Type MOFs: From Discrete Sorption Sites to Water-Bridge-Mediated Pore Condensation.” Nanomaterials, vol. 14, no. 22, MDPI AG, 2024, p. 1791, doi:10.3390/nano14221791.' short: M. Kloß, L. Schäfers, Z. Zhao, C. Weinberger, H. Egold, M. Tiemann, Nanomaterials 14 (2024) 1791. date_created: 2024-11-08T06:18:11Z date_updated: 2025-01-10T14:27:39Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.3390/nano14221791 intvolume: ' 14' issue: '22' language: - iso: eng main_file_link: - open_access: '1' oa: '1' page: '1791' publication: Nanomaterials publication_identifier: issn: - 2079-4991 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: 'Water Sorption on Isoreticular CPO-27-Type MOFs: From Discrete Sorption Sites to Water-Bridge-Mediated Pore Condensation' type: journal_article user_id: '23547' volume: 14 year: '2024' ... --- _id: '56080' abstract: - lang: eng text: CPO‐27 is a metal‐organic framework (MOF) with coordinatively unsaturated metal centers (open metal sites). It is therefore an ideal host material for small guest molecules, including water. This opens up numerous possible applications, such as proton conduction, humidity sensing, water harvesting, or adsorption‐driven heat pumps. For all of these applications, profound knowledge of the adsorption and desorption of water in the micropores is mandatory. The hydration and water structure in CPO‐27‐M (M = Zn or Cu) is investigated using water vapor sorption, Fourier transform infrared (FTIR) spectroscopy, density functional theory (DFT) calculations, and molecular dynamics simulation. In the pores of CPO‐27‐Zn, water binds as a ligand to the Zn center. Additional water molecules are stepwise incorporated at defined positions, forming a network of H‐bonds with the framework and with each other. In CPO‐27‐Cu, hydration proceeds by an entirely different mechanism. Here, water does not coordinate to the metal center, but only forms H‐bonds with the framework; pore filling occurs mostly in a single step, with the open metal site remaining unoccupied. Water in the pores forms clusters with extensive intra‐cluster H‐bonding. author: - first_name: Marvin full_name: Kloß, Marvin last_name: Kloß - first_name: Michael full_name: Beerbaum, Michael last_name: Beerbaum - first_name: Dominik full_name: Baier, Dominik last_name: Baier - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Frederik full_name: Zysk, Frederik id: '14757' last_name: Zysk - first_name: Hossam full_name: Elgabarty, Hossam id: '60250' last_name: Elgabarty orcid: 0000-0002-4945-1481 - first_name: Thomas D. full_name: Kühne, Thomas D. last_name: Kühne - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 citation: ama: 'Kloß M, Beerbaum M, Baier D, et al. Understanding Hydration in CPO‐27 Metal‐Organic Frameworks: Strong Impact of the Chemical Nature of the Metal (Cu, Zn). Advanced Materials Interfaces. 2024;11(35):2400476. doi:10.1002/admi.202400476' apa: 'Kloß, M., Beerbaum, M., Baier, D., Weinberger, C., Zysk, F., Elgabarty, H., Kühne, T. D., & Tiemann, M. (2024). Understanding Hydration in CPO‐27 Metal‐Organic Frameworks: Strong Impact of the Chemical Nature of the Metal (Cu, Zn). Advanced Materials Interfaces, 11(35), 2400476. https://doi.org/10.1002/admi.202400476' bibtex: '@article{Kloß_Beerbaum_Baier_Weinberger_Zysk_Elgabarty_Kühne_Tiemann_2024, title={Understanding Hydration in CPO‐27 Metal‐Organic Frameworks: Strong Impact of the Chemical Nature of the Metal (Cu, Zn)}, volume={11}, DOI={10.1002/admi.202400476}, number={35}, journal={Advanced Materials Interfaces}, publisher={Wiley}, author={Kloß, Marvin and Beerbaum, Michael and Baier, Dominik and Weinberger, Christian and Zysk, Frederik and Elgabarty, Hossam and Kühne, Thomas D. and Tiemann, Michael}, year={2024}, pages={2400476} }' chicago: 'Kloß, Marvin, Michael Beerbaum, Dominik Baier, Christian Weinberger, Frederik Zysk, Hossam Elgabarty, Thomas D. Kühne, and Michael Tiemann. “Understanding Hydration in CPO‐27 Metal‐Organic Frameworks: Strong Impact of the Chemical Nature of the Metal (Cu, Zn).” Advanced Materials Interfaces 11, no. 35 (2024): 2400476. https://doi.org/10.1002/admi.202400476.' ieee: 'M. Kloß et al., “Understanding Hydration in CPO‐27 Metal‐Organic Frameworks: Strong Impact of the Chemical Nature of the Metal (Cu, Zn),” Advanced Materials Interfaces, vol. 11, no. 35, p. 2400476, 2024, doi: 10.1002/admi.202400476.' mla: 'Kloß, Marvin, et al. “Understanding Hydration in CPO‐27 Metal‐Organic Frameworks: Strong Impact of the Chemical Nature of the Metal (Cu, Zn).” Advanced Materials Interfaces, vol. 11, no. 35, Wiley, 2024, p. 2400476, doi:10.1002/admi.202400476.' short: M. Kloß, M. Beerbaum, D. Baier, C. Weinberger, F. Zysk, H. Elgabarty, T.D. Kühne, M. Tiemann, Advanced Materials Interfaces 11 (2024) 2400476. date_created: 2024-09-06T07:07:17Z date_updated: 2025-01-10T14:23:51Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.1002/admi.202400476 intvolume: ' 11' issue: '35' language: - iso: eng main_file_link: - open_access: '1' oa: '1' page: '2400476' publication: Advanced Materials Interfaces publication_identifier: issn: - 2196-7350 - 2196-7350 publication_status: published publisher: Wiley quality_controlled: '1' status: public title: 'Understanding Hydration in CPO‐27 Metal‐Organic Frameworks: Strong Impact of the Chemical Nature of the Metal (Cu, Zn)' type: journal_article user_id: '23547' volume: 11 year: '2024' ... --- _id: '45571' abstract: - lang: eng text: Self-templating is a facile strategy for synthesizing porous carbons by direct pyrolysis of organic metal salts. However, the method typically suffers from low yields (<4%) and limited specific surface areas (SSA<2000 m2 g−1) originating from low activity of metal cations (e.g., K+ or Na+) in promoting construction and activation of carbon frameworks. Here we use cesium acetate as the only precursor of oxo-carbons with large SSA of the order of 3000 m2 g−1, pore volume approaching 2 cm3 g−1, tunable oxygen contents, and yields of up to 15 %. We unravel the role of Cs+ as an efficient promoter of framework formation, templating and etching agent, while acetates act as carbon/oxygen sources of carbonaceous frameworks. The oxo-carbons show record-high CO2 uptake of 8.71 mmol g−1 and an ultimate specific capacitance of 313 F g−1 in the supercapacitor. This study helps to understand and rationally tailor the materials design by a still rare organic solid-state chemistry. article_type: original author: - first_name: Jiaxin full_name: Li, Jiaxin last_name: Li - first_name: Janina full_name: Kossmann, Janina last_name: Kossmann - first_name: Ke full_name: Zeng, Ke last_name: Zeng - first_name: Kun full_name: Zhang, Kun last_name: Zhang - first_name: Bingjie full_name: Wang, Bingjie last_name: Wang - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Markus full_name: Antonietti, Markus last_name: Antonietti - first_name: Mateusz full_name: Odziomek, Mateusz last_name: Odziomek - first_name: Nieves full_name: López‐Salas, Nieves last_name: López‐Salas citation: ama: 'Li J, Kossmann J, Zeng K, et al. When High‐Temperature Cesium Chemistry Meets Self‐Templating: Metal Acetates as Building Blocks of Unusual Highly Porous Carbons. Angewandte Chemie International Edition. Published online 2023. doi:10.1002/anie.202217808' apa: 'Li, J., Kossmann, J., Zeng, K., Zhang, K., Wang, B., Weinberger, C., Antonietti, M., Odziomek, M., & López‐Salas, N. (2023). When High‐Temperature Cesium Chemistry Meets Self‐Templating: Metal Acetates as Building Blocks of Unusual Highly Porous Carbons. Angewandte Chemie International Edition. https://doi.org/10.1002/anie.202217808' bibtex: '@article{Li_Kossmann_Zeng_Zhang_Wang_Weinberger_Antonietti_Odziomek_López‐Salas_2023, title={When High‐Temperature Cesium Chemistry Meets Self‐Templating: Metal Acetates as Building Blocks of Unusual Highly Porous Carbons}, DOI={10.1002/anie.202217808}, journal={Angewandte Chemie International Edition}, publisher={Wiley}, author={Li, Jiaxin and Kossmann, Janina and Zeng, Ke and Zhang, Kun and Wang, Bingjie and Weinberger, Christian and Antonietti, Markus and Odziomek, Mateusz and López‐Salas, Nieves}, year={2023} }' chicago: 'Li, Jiaxin, Janina Kossmann, Ke Zeng, Kun Zhang, Bingjie Wang, Christian Weinberger, Markus Antonietti, Mateusz Odziomek, and Nieves López‐Salas. “When High‐Temperature Cesium Chemistry Meets Self‐Templating: Metal Acetates as Building Blocks of Unusual Highly Porous Carbons.” Angewandte Chemie International Edition, 2023. https://doi.org/10.1002/anie.202217808.' ieee: 'J. Li et al., “When High‐Temperature Cesium Chemistry Meets Self‐Templating: Metal Acetates as Building Blocks of Unusual Highly Porous Carbons,” Angewandte Chemie International Edition, 2023, doi: 10.1002/anie.202217808.' mla: 'Li, Jiaxin, et al. “When High‐Temperature Cesium Chemistry Meets Self‐Templating: Metal Acetates as Building Blocks of Unusual Highly Porous Carbons.” Angewandte Chemie International Edition, Wiley, 2023, doi:10.1002/anie.202217808.' short: J. Li, J. Kossmann, K. Zeng, K. Zhang, B. Wang, C. Weinberger, M. Antonietti, M. Odziomek, N. López‐Salas, Angewandte Chemie International Edition (2023). date_created: 2023-06-12T07:42:09Z date_updated: 2024-03-21T12:01:33Z doi: 10.1002/anie.202217808 keyword: - CO2 Adsorption - Cesium Acetate - Cesium Effect - Porous Carbons - Supercapacitor language: - iso: eng publication: Angewandte Chemie International Edition publication_identifier: issn: - 0044-8249 - 1521-3757 publication_status: published publisher: Wiley status: public title: 'When High‐Temperature Cesium Chemistry Meets Self‐Templating: Metal Acetates as Building Blocks of Unusual Highly Porous Carbons' type: journal_article user_id: '11848' year: '2023' ... --- _id: '42679' abstract: - lang: eng text: The Saharan desert ant Cataglyphis bombycina is densely covered with shiny silver setae (hair-like structures). Their appearance was explained by geometric optics and total internal reflection. The setae also increase the emissivity of the ant, as they form an effective medium. This work provides additional data on microstructural details of the setae that are used to simulate the scattering of an individual seta to explain their influence on the optical properties. This is achieved by characterization of their structure using light microscopy and scanning/transmission electron microscopy. How the microstructural features influence scattering is investigated wave-optically within the limits of finite-difference time-domain simulations from the ultraviolet to the mid-infrared spectral range to elucidate the optical effects beyond ray optics and effective medium theory. The results show that Mie scattering plays an important role in protecting the ant from solar radiation and could be relevant for its thermal tolerance. article_type: original author: - first_name: Bertram full_name: Schwind, Bertram last_name: Schwind - first_name: Xia full_name: Wu, Xia last_name: Wu - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Helge-Otto full_name: Fabritius, Helge-Otto last_name: Fabritius citation: ama: Schwind B, Wu X, Tiemann M, Fabritius H-O. Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina. Journal of the Optical Society of America B. 2023;40(3):B49-B58. doi:10.1364/josab.474899 apa: Schwind, B., Wu, X., Tiemann, M., & Fabritius, H.-O. (2023). Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina. Journal of the Optical Society of America B, 40(3), B49–B58. https://doi.org/10.1364/josab.474899 bibtex: '@article{Schwind_Wu_Tiemann_Fabritius_2023, title={Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina}, volume={40}, DOI={10.1364/josab.474899}, number={3}, journal={Journal of the Optical Society of America B}, publisher={Optica Publishing Group}, author={Schwind, Bertram and Wu, Xia and Tiemann, Michael and Fabritius, Helge-Otto}, year={2023}, pages={B49–B58} }' chicago: 'Schwind, Bertram, Xia Wu, Michael Tiemann, and Helge-Otto Fabritius. “Broadband Mie Scattering Effects by Structural Features of Setae from the Saharan Silver Ant Cataglyphis Bombycina.” Journal of the Optical Society of America B 40, no. 3 (2023): B49–58. https://doi.org/10.1364/josab.474899.' ieee: 'B. Schwind, X. Wu, M. Tiemann, and H.-O. Fabritius, “Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina,” Journal of the Optical Society of America B, vol. 40, no. 3, pp. B49–B58, 2023, doi: 10.1364/josab.474899.' mla: Schwind, Bertram, et al. “Broadband Mie Scattering Effects by Structural Features of Setae from the Saharan Silver Ant Cataglyphis Bombycina.” Journal of the Optical Society of America B, vol. 40, no. 3, Optica Publishing Group, 2023, pp. B49–58, doi:10.1364/josab.474899. short: B. Schwind, X. Wu, M. Tiemann, H.-O. Fabritius, Journal of the Optical Society of America B 40 (2023) B49–B58. date_created: 2023-03-02T17:48:38Z date_updated: 2024-05-22T14:29:39Z department: - _id: '35' - _id: '2' - _id: '307' - _id: '230' doi: 10.1364/josab.474899 intvolume: ' 40' issue: '3' keyword: - Atomic and Molecular Physics - and Optics - Statistical and Nonlinear Physics language: - iso: eng page: B49 - B58 publication: Journal of the Optical Society of America B publication_identifier: issn: - 0740-3224 - 1520-8540 publication_status: published publisher: Optica Publishing Group quality_controlled: '1' status: public title: Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina type: journal_article user_id: '23547' volume: 40 year: '2023' ... --- _id: '43457' abstract: - lang: eng text: The production of hydrogen and the utilization of biomass for sustainable concepts of energy conversion and storage require gas sensors that discriminate between hydrogen (H2) and carbon monoxide (CO). Mesoporous copper–ceria (Cu–CeO2) materials with large specific surface areas and uniform porosity are prepared by nanocasting, and their textural properties are characterized by N2 physisorption, powder XRD, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The oxidation states of copper (Cu+, Cu2+) and cerium (Ce3+, Ce4+) are investigated by XPS. The materials are used as resistive gas sensors for H2 and CO. The sensors show a stronger response to CO than to H2 and low cross-sensitivity to humidity. Copper turns out to be a necessary component; copper-free ceria materials prepared by the same method show only poor sensing performance. By measuring both gases (CO and H2) simultaneously, it is shown that this behavior can be utilized for selective sensing of CO in the presence of H2. author: - first_name: Dominik full_name: Baier, Dominik last_name: Baier - first_name: Tatiana full_name: Priamushko, Tatiana last_name: Priamushko - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Freddy full_name: Kleitz, Freddy last_name: Kleitz - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 citation: ama: Baier D, Priamushko T, Weinberger C, Kleitz F, Tiemann M. Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors. ACS Sensors. 2023;8(4):1616-1623. doi:10.1021/acssensors.2c02739 apa: Baier, D., Priamushko, T., Weinberger, C., Kleitz, F., & Tiemann, M. (2023). Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors. ACS Sensors, 8(4), 1616–1623. https://doi.org/10.1021/acssensors.2c02739 bibtex: '@article{Baier_Priamushko_Weinberger_Kleitz_Tiemann_2023, title={Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors}, volume={8}, DOI={10.1021/acssensors.2c02739}, number={4}, journal={ACS Sensors}, publisher={American Chemical Society (ACS)}, author={Baier, Dominik and Priamushko, Tatiana and Weinberger, Christian and Kleitz, Freddy and Tiemann, Michael}, year={2023}, pages={1616–1623} }' chicago: 'Baier, Dominik, Tatiana Priamushko, Christian Weinberger, Freddy Kleitz, and Michael Tiemann. “Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors.” ACS Sensors 8, no. 4 (2023): 1616–23. https://doi.org/10.1021/acssensors.2c02739.' ieee: 'D. Baier, T. Priamushko, C. Weinberger, F. Kleitz, and M. Tiemann, “Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors,” ACS Sensors, vol. 8, no. 4, pp. 1616–1623, 2023, doi: 10.1021/acssensors.2c02739.' mla: Baier, Dominik, et al. “Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors.” ACS Sensors, vol. 8, no. 4, American Chemical Society (ACS), 2023, pp. 1616–23, doi:10.1021/acssensors.2c02739. short: D. Baier, T. Priamushko, C. Weinberger, F. Kleitz, M. Tiemann, ACS Sensors 8 (2023) 1616–1623. date_created: 2023-04-12T06:52:34Z date_updated: 2023-05-01T05:47:53Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.1021/acssensors.2c02739 intvolume: ' 8' issue: '4' keyword: - Fluid Flow and Transfer Processes - Process Chemistry and Technology - Instrumentation - Bioengineering language: - iso: eng page: 1616 - 1623 publication: ACS Sensors publication_identifier: issn: - 2379-3694 - 2379-3694 publication_status: published publisher: American Chemical Society (ACS) quality_controlled: '1' status: public title: Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors type: journal_article user_id: '23547' volume: 8 year: '2023' ... --- _id: '44837' abstract: - lang: eng text: Hydrothermal carbonization (HTC) is an efficient thermochemical method for the conversion of organic feedstock to carbonaceous solids. HTC of different saccharides is known to produce microspheres (MS) with mostly Gaussian size distribution, which are utilized as functional materials in various applications, both as pristine MS and as a precursor for hard carbon MS. Although the average size of the MS can be influenced by adjusting the process parameters, there is no reliable mechanism to affect their size distribution. Our results demonstrate that HTC of trehalose, in contrast to other saccharides, results in a distinctly bimodal sphere diameter distribution consisting of small spheres with diameters of (2.1 ± 0.2) μm and of large spheres with diameters of (10.4 ± 2.6) μm. Remarkably, after pyrolytic post-carbonization at 1000 °C the MS develop a multimodal pore size distribution with abundant macropores > 100 nm, mesopores > 10 nm and micropores < 2 nm, which were examined by small-angle X-ray scattering and visualized by charge-compensated helium ion microscopy. The bimodal size distribution and hierarchical porosity provide an extraordinary set of properties and potential variables for the tailored synthesis of hierarchical porous carbons, making trehalose-derived hard carbon MS a highly promising material for applications in catalysis, filtration, and energy storage devices. author: - first_name: Martin full_name: Wortmann, Martin last_name: Wortmann - first_name: Waldemar full_name: Keil, Waldemar last_name: Keil - first_name: Elise full_name: Diestelhorst, Elise last_name: Diestelhorst - first_name: Michael full_name: Westphal, Michael last_name: Westphal - first_name: René full_name: Haverkamp, René last_name: Haverkamp - first_name: Bennet full_name: Brockhagen, Bennet last_name: Brockhagen - first_name: Jan full_name: Biedinger, Jan last_name: Biedinger - first_name: Laila full_name: Bondzio, Laila last_name: Bondzio - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Dominik full_name: Baier, Dominik last_name: Baier - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Andreas full_name: Hütten, Andreas last_name: Hütten - first_name: Thomas full_name: Hellweg, Thomas last_name: Hellweg - first_name: Günter full_name: Reiss, Günter last_name: Reiss - first_name: Claudia full_name: Schmidt, Claudia last_name: Schmidt - first_name: Klaus full_name: Sattler, Klaus last_name: Sattler - first_name: Natalie full_name: Frese, Natalie last_name: Frese citation: ama: Wortmann M, Keil W, Diestelhorst E, et al. Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose. RSC Advances. 2023;13(21):14181-14189. doi:10.1039/d3ra01301d apa: Wortmann, M., Keil, W., Diestelhorst, E., Westphal, M., Haverkamp, R., Brockhagen, B., Biedinger, J., Bondzio, L., Weinberger, C., Baier, D., Tiemann, M., Hütten, A., Hellweg, T., Reiss, G., Schmidt, C., Sattler, K., & Frese, N. (2023). Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose. RSC Advances, 13(21), 14181–14189. https://doi.org/10.1039/d3ra01301d bibtex: '@article{Wortmann_Keil_Diestelhorst_Westphal_Haverkamp_Brockhagen_Biedinger_Bondzio_Weinberger_Baier_et al._2023, title={Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose}, volume={13}, DOI={10.1039/d3ra01301d}, number={21}, journal={RSC Advances}, publisher={Royal Society of Chemistry (RSC)}, author={Wortmann, Martin and Keil, Waldemar and Diestelhorst, Elise and Westphal, Michael and Haverkamp, René and Brockhagen, Bennet and Biedinger, Jan and Bondzio, Laila and Weinberger, Christian and Baier, Dominik and et al.}, year={2023}, pages={14181–14189} }' chicago: 'Wortmann, Martin, Waldemar Keil, Elise Diestelhorst, Michael Westphal, René Haverkamp, Bennet Brockhagen, Jan Biedinger, et al. “Hard Carbon Microspheres with Bimodal Size Distribution and Hierarchical Porosity via Hydrothermal Carbonization of Trehalose.” RSC Advances 13, no. 21 (2023): 14181–89. https://doi.org/10.1039/d3ra01301d.' ieee: 'M. Wortmann et al., “Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose,” RSC Advances, vol. 13, no. 21, pp. 14181–14189, 2023, doi: 10.1039/d3ra01301d.' mla: Wortmann, Martin, et al. “Hard Carbon Microspheres with Bimodal Size Distribution and Hierarchical Porosity via Hydrothermal Carbonization of Trehalose.” RSC Advances, vol. 13, no. 21, Royal Society of Chemistry (RSC), 2023, pp. 14181–89, doi:10.1039/d3ra01301d. short: M. Wortmann, W. Keil, E. Diestelhorst, M. Westphal, R. Haverkamp, B. Brockhagen, J. Biedinger, L. Bondzio, C. Weinberger, D. Baier, M. Tiemann, A. Hütten, T. Hellweg, G. Reiss, C. Schmidt, K. Sattler, N. Frese, RSC Advances 13 (2023) 14181–14189. date_created: 2023-05-12T07:16:15Z date_updated: 2023-05-12T07:18:51Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.1039/d3ra01301d intvolume: ' 13' issue: '21' keyword: - General Chemical Engineering - General Chemistry language: - iso: eng main_file_link: - open_access: '1' oa: '1' page: 14181-14189 publication: RSC Advances publication_identifier: issn: - 2046-2069 publication_status: published publisher: Royal Society of Chemistry (RSC) quality_controlled: '1' status: public title: Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose type: journal_article user_id: '23547' volume: 13 year: '2023' ... --- _id: '44116' abstract: - lang: eng text: Faradaic reactions including charge transfer are often accompanied with diffusion limitation inside the bulk. Conductive two-dimensional frameworks (2D MOFs) with a fast ion transport can combine both - charge transfer and fast diffusion inside their porous structure. To study remaining diffusion limitations caused by particle morphology, different synthesis routes of Cu-2,3,6,7,10,11-hexahydroxytriphenylene (Cu3(HHTP)2), a copper-based 2D MOF, are used to obtain flake- and rod-like MOF particles. Both morphologies are systematically characterized and evaluated for redox-active Li+ ion storage. The redox mechanism is investigated by means of X-ray absorption spectroscopy, FTIR spectroscopy and in situ XRD. Both types are compared regarding kinetic properties for Li+ ion storage via cyclic voltammetry and impedance spectroscopy. A significant influence of particle morphology for 2D MOFs on kinetic aspects of electrochemical Li+ ion storage can be observed. This study opens the path for optimization of redox active porous structures to overcome diffusion limitations of Faradaic processes. author: - first_name: Jens Matthies full_name: Wrogemann, Jens Matthies last_name: Wrogemann - first_name: Marco Joes full_name: Lüther, Marco Joes last_name: Lüther - first_name: Peer full_name: Bärmann, Peer last_name: Bärmann - first_name: Mailis full_name: Lounasvuori, Mailis last_name: Lounasvuori - first_name: Ali full_name: Javed, Ali last_name: Javed - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Ronny full_name: Golnak, Ronny last_name: Golnak - first_name: Jie full_name: Xiao, Jie last_name: Xiao - first_name: Tristan full_name: Petit, Tristan last_name: Petit - first_name: Tobias full_name: Placke, Tobias last_name: Placke - first_name: Martin full_name: Winter, Martin last_name: Winter citation: ama: 'Wrogemann JM, Lüther MJ, Bärmann P, et al. Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage. Angewandte Chemie International Edition. 2023;62(26):e202303111. doi:10.1002/anie.202303111' apa: 'Wrogemann, J. M., Lüther, M. J., Bärmann, P., Lounasvuori, M., Javed, A., Tiemann, M., Golnak, R., Xiao, J., Petit, T., Placke, T., & Winter, M. (2023). Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage. Angewandte Chemie International Edition, 62(26), e202303111. https://doi.org/10.1002/anie.202303111' bibtex: '@article{Wrogemann_Lüther_Bärmann_Lounasvuori_Javed_Tiemann_Golnak_Xiao_Petit_Placke_et al._2023, title={Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage}, volume={62}, DOI={10.1002/anie.202303111}, number={26}, journal={Angewandte Chemie International Edition}, publisher={Wiley}, author={Wrogemann, Jens Matthies and Lüther, Marco Joes and Bärmann, Peer and Lounasvuori, Mailis and Javed, Ali and Tiemann, Michael and Golnak, Ronny and Xiao, Jie and Petit, Tristan and Placke, Tobias and et al.}, year={2023}, pages={e202303111} }' chicago: 'Wrogemann, Jens Matthies, Marco Joes Lüther, Peer Bärmann, Mailis Lounasvuori, Ali Javed, Michael Tiemann, Ronny Golnak, et al. “Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage.” Angewandte Chemie International Edition 62, no. 26 (2023): e202303111. https://doi.org/10.1002/anie.202303111.' ieee: 'J. M. Wrogemann et al., “Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage,” Angewandte Chemie International Edition, vol. 62, no. 26, p. e202303111, 2023, doi: 10.1002/anie.202303111.' mla: 'Wrogemann, Jens Matthies, et al. “Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage.” Angewandte Chemie International Edition, vol. 62, no. 26, Wiley, 2023, p. e202303111, doi:10.1002/anie.202303111.' short: J.M. Wrogemann, M.J. Lüther, P. Bärmann, M. Lounasvuori, A. Javed, M. Tiemann, R. Golnak, J. Xiao, T. Petit, T. Placke, M. Winter, Angewandte Chemie International Edition 62 (2023) e202303111. date_created: 2023-04-22T06:17:33Z date_updated: 2023-06-21T09:50:14Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.1002/anie.202303111 intvolume: ' 62' issue: '26' keyword: - General Chemistry - Catalysis language: - iso: eng main_file_link: - open_access: '1' oa: '1' page: e202303111 publication: Angewandte Chemie International Edition publication_identifier: issn: - 1433-7851 - 1521-3773 publication_status: published publisher: Wiley quality_controlled: '1' status: public title: 'Overcoming Diffusion Limitation of Faradaic Processes: Property‐Performance Relationships of 2D Conductive Metal‐Organic Framework Cu3(HHTP)2 for Reversible Lithium‐Ion Storage' type: journal_article user_id: '23547' volume: 62 year: '2023' ... --- _id: '46480' article_number: '147317' author: - first_name: Hendrik full_name: Müller, Hendrik last_name: Müller - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Guido full_name: Grundmeier, Guido id: '194' last_name: Grundmeier - first_name: Maria Teresa full_name: de los Arcos de Pedro, Maria Teresa id: '54556' last_name: de los Arcos de Pedro citation: ama: Müller H, Weinberger C, Grundmeier G, de los Arcos de Pedro MT. UV-enhanced environmental charge compensation in near ambient pressure XPS. Journal of Electron Spectroscopy and Related Phenomena. 2023;264. doi:10.1016/j.elspec.2023.147317 apa: Müller, H., Weinberger, C., Grundmeier, G., & de los Arcos de Pedro, M. T. (2023). UV-enhanced environmental charge compensation in near ambient pressure XPS. Journal of Electron Spectroscopy and Related Phenomena, 264, Article 147317. https://doi.org/10.1016/j.elspec.2023.147317 bibtex: '@article{Müller_Weinberger_Grundmeier_de los Arcos de Pedro_2023, title={UV-enhanced environmental charge compensation in near ambient pressure XPS}, volume={264}, DOI={10.1016/j.elspec.2023.147317}, number={147317}, journal={Journal of Electron Spectroscopy and Related Phenomena}, publisher={Elsevier BV}, author={Müller, Hendrik and Weinberger, Christian and Grundmeier, Guido and de los Arcos de Pedro, Maria Teresa}, year={2023} }' chicago: Müller, Hendrik, Christian Weinberger, Guido Grundmeier, and Maria Teresa de los Arcos de Pedro. “UV-Enhanced Environmental Charge Compensation in near Ambient Pressure XPS.” Journal of Electron Spectroscopy and Related Phenomena 264 (2023). https://doi.org/10.1016/j.elspec.2023.147317. ieee: 'H. Müller, C. Weinberger, G. Grundmeier, and M. T. de los Arcos de Pedro, “UV-enhanced environmental charge compensation in near ambient pressure XPS,” Journal of Electron Spectroscopy and Related Phenomena, vol. 264, Art. no. 147317, 2023, doi: 10.1016/j.elspec.2023.147317.' mla: Müller, Hendrik, et al. “UV-Enhanced Environmental Charge Compensation in near Ambient Pressure XPS.” Journal of Electron Spectroscopy and Related Phenomena, vol. 264, 147317, Elsevier BV, 2023, doi:10.1016/j.elspec.2023.147317. short: H. Müller, C. Weinberger, G. Grundmeier, M.T. de los Arcos de Pedro, Journal of Electron Spectroscopy and Related Phenomena 264 (2023). date_created: 2023-08-11T14:11:57Z date_updated: 2023-08-11T14:13:19Z department: - _id: '302' doi: 10.1016/j.elspec.2023.147317 intvolume: ' 264' keyword: - Physical and Theoretical Chemistry - Spectroscopy - Condensed Matter Physics - Atomic and Molecular Physics - and Optics - Radiation - Electronic - Optical and Magnetic Materials language: - iso: eng publication: Journal of Electron Spectroscopy and Related Phenomena publication_identifier: issn: - 0368-2048 publication_status: published publisher: Elsevier BV status: public title: UV-enhanced environmental charge compensation in near ambient pressure XPS type: journal_article user_id: '54556' volume: 264 year: '2023' ... --- _id: '35707' abstract: - lang: eng text: The proton conductivity of two coordination networks, [Mg(H2O)2(H3L)]·H2O and [Pb2(HL)]·H2O (H5L = (H2O3PCH2)2-NCH2-C6H4-SO3H), is investigated by AC impedance spectroscopy. Both materials contain the same phosphonato-sulfonate linker molecule, but have clearly different crystal structures, which has a strong effect on proton conductivity. In the Mg-based coordination network, dangling sulfonate groups are part of an extended hydrogen bonding network, facilitating a “proton hopping” with low activation energy; the material shows a moderate proton conductivity. In the Pb-based metal-organic framework, in contrast, no extended hydrogen bonding occurs, as the sulfonate groups coordinate to Pb2+, without forming hydrogen bonds; the proton conductivity is much lower in this material. article_type: original author: - first_name: Ali full_name: Javed, Ali last_name: Javed - first_name: Felix full_name: Steinke, Felix last_name: Steinke - first_name: Stephan full_name: Wöhlbrandt, Stephan last_name: Wöhlbrandt - first_name: Hana full_name: Bunzen, Hana last_name: Bunzen - first_name: Norbert full_name: Stock, Norbert last_name: Stock - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 citation: ama: Javed A, Steinke F, Wöhlbrandt S, Bunzen H, Stock N, Tiemann M. The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks. Beilstein Journal of Nanotechnology. 2022;13:437-443. doi:10.3762/bjnano.13.36 apa: Javed, A., Steinke, F., Wöhlbrandt, S., Bunzen, H., Stock, N., & Tiemann, M. (2022). The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks. Beilstein Journal of Nanotechnology, 13, 437–443. https://doi.org/10.3762/bjnano.13.36 bibtex: '@article{Javed_Steinke_Wöhlbrandt_Bunzen_Stock_Tiemann_2022, title={The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks}, volume={13}, DOI={10.3762/bjnano.13.36}, journal={Beilstein Journal of Nanotechnology}, publisher={Beilstein Institut}, author={Javed, Ali and Steinke, Felix and Wöhlbrandt, Stephan and Bunzen, Hana and Stock, Norbert and Tiemann, Michael}, year={2022}, pages={437–443} }' chicago: 'Javed, Ali, Felix Steinke, Stephan Wöhlbrandt, Hana Bunzen, Norbert Stock, and Michael Tiemann. “The Role of Sulfonate Groups and Hydrogen Bonding in the Proton Conductivity of Two Coordination Networks.” Beilstein Journal of Nanotechnology 13 (2022): 437–43. https://doi.org/10.3762/bjnano.13.36.' ieee: 'A. Javed, F. Steinke, S. Wöhlbrandt, H. Bunzen, N. Stock, and M. Tiemann, “The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks,” Beilstein Journal of Nanotechnology, vol. 13, pp. 437–443, 2022, doi: 10.3762/bjnano.13.36.' mla: Javed, Ali, et al. “The Role of Sulfonate Groups and Hydrogen Bonding in the Proton Conductivity of Two Coordination Networks.” Beilstein Journal of Nanotechnology, vol. 13, Beilstein Institut, 2022, pp. 437–43, doi:10.3762/bjnano.13.36. short: A. Javed, F. Steinke, S. Wöhlbrandt, H. Bunzen, N. Stock, M. Tiemann, Beilstein Journal of Nanotechnology 13 (2022) 437–443. date_created: 2023-01-10T09:12:54Z date_updated: 2023-03-03T08:37:14Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.3762/bjnano.13.36 intvolume: ' 13' keyword: - Electrical and Electronic Engineering - General Physics and Astronomy - General Materials Science language: - iso: eng main_file_link: - open_access: '1' url: https://www.beilstein-journals.org/bjnano/content/pdf/2190-4286-13-36.pdf oa: '1' page: 437-443 publication: Beilstein Journal of Nanotechnology publication_identifier: issn: - 2190-4286 publication_status: published publisher: Beilstein Institut quality_controlled: '1' status: public title: The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks type: journal_article user_id: '23547' volume: 13 year: '2022' ... --- _id: '33691' abstract: - lang: eng text: Near ambient pressure XPS in nitrogen atmosphere was utilized to investigate gas-solid interactions within porous SiO2 films ranging from 30 to 75 nm thickness. The films were differentiated in terms of porosity and roughness. The XPS N1s core levels of the N2 gas in presence of the SiO2 samples showed variations in width, binding energy and line shape. The width correlated with the surface charge induced in the dielectric films upon X-ray irradiation. The observed different binding energies observed for the N1s peak can only partly be associated with intrinsic work function differences between the samples, opening the possibility that the effect of physisorption at room temperature could be detected by a shift in the measured binding energy. However, the signals also show an increasing asymmetry with rising surface charge. This might be associated with the formation of vertical electrical gradients within the dielectric porous thin films, which complicates the assignment of binding energy positions to specific surface-related effects. With the support of Monte Carlo and first principles density functional theory calculations, the observed shifts were discussed in terms of the possible formation of transitory dipoles upon N2 physisorption within the porous SiO2 films. article_number: '154525' article_type: original author: - first_name: Teresa full_name: de los Arcos, Teresa last_name: de los Arcos - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Frederik full_name: Zysk, Frederik id: '14757' last_name: Zysk - first_name: Varun full_name: Raj Damerla, Varun last_name: Raj Damerla - first_name: Sabrina full_name: Kollmann, Sabrina last_name: Kollmann - first_name: Pascal full_name: Vieth, Pascal last_name: Vieth - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Thomas full_name: Kühne, Thomas id: '49079' last_name: Kühne - first_name: Guido full_name: Grundmeier, Guido id: '194' last_name: Grundmeier citation: ama: de los Arcos T, Weinberger C, Zysk F, et al. Challenges in the interpretation of gas core levels for the determination of gas-solid interactions within dielectric porous films by ambient pressure XPS. Applied Surface Science. 2022;604. doi:10.1016/j.apsusc.2022.154525 apa: de los Arcos, T., Weinberger, C., Zysk, F., Raj Damerla, V., Kollmann, S., Vieth, P., Tiemann, M., Kühne, T., & Grundmeier, G. (2022). Challenges in the interpretation of gas core levels for the determination of gas-solid interactions within dielectric porous films by ambient pressure XPS. Applied Surface Science, 604, Article 154525. https://doi.org/10.1016/j.apsusc.2022.154525 bibtex: '@article{de los Arcos_Weinberger_Zysk_Raj Damerla_Kollmann_Vieth_Tiemann_Kühne_Grundmeier_2022, title={Challenges in the interpretation of gas core levels for the determination of gas-solid interactions within dielectric porous films by ambient pressure XPS}, volume={604}, DOI={10.1016/j.apsusc.2022.154525}, number={154525}, journal={Applied Surface Science}, publisher={Elsevier BV}, author={de los Arcos, Teresa and Weinberger, Christian and Zysk, Frederik and Raj Damerla, Varun and Kollmann, Sabrina and Vieth, Pascal and Tiemann, Michael and Kühne, Thomas and Grundmeier, Guido}, year={2022} }' chicago: Arcos, Teresa de los, Christian Weinberger, Frederik Zysk, Varun Raj Damerla, Sabrina Kollmann, Pascal Vieth, Michael Tiemann, Thomas Kühne, and Guido Grundmeier. “Challenges in the Interpretation of Gas Core Levels for the Determination of Gas-Solid Interactions within Dielectric Porous Films by Ambient Pressure XPS.” Applied Surface Science 604 (2022). https://doi.org/10.1016/j.apsusc.2022.154525. ieee: 'T. de los Arcos et al., “Challenges in the interpretation of gas core levels for the determination of gas-solid interactions within dielectric porous films by ambient pressure XPS,” Applied Surface Science, vol. 604, Art. no. 154525, 2022, doi: 10.1016/j.apsusc.2022.154525.' mla: de los Arcos, Teresa, et al. “Challenges in the Interpretation of Gas Core Levels for the Determination of Gas-Solid Interactions within Dielectric Porous Films by Ambient Pressure XPS.” Applied Surface Science, vol. 604, 154525, Elsevier BV, 2022, doi:10.1016/j.apsusc.2022.154525. short: T. de los Arcos, C. Weinberger, F. Zysk, V. Raj Damerla, S. Kollmann, P. Vieth, M. Tiemann, T. Kühne, G. Grundmeier, Applied Surface Science 604 (2022). date_created: 2022-10-11T08:22:25Z date_updated: 2023-03-03T11:32:04Z department: - _id: '613' - _id: '35' - _id: '2' - _id: '307' - _id: '302' - _id: '304' doi: 10.1016/j.apsusc.2022.154525 intvolume: ' 604' keyword: - Surfaces - Coatings and Films - Condensed Matter Physics - Surfaces and Interfaces - General Physics and Astronomy - General Chemistry language: - iso: eng publication: Applied Surface Science publication_identifier: issn: - 0169-4332 publication_status: published publisher: Elsevier BV quality_controlled: '1' status: public title: Challenges in the interpretation of gas core levels for the determination of gas-solid interactions within dielectric porous films by ambient pressure XPS type: journal_article user_id: '23547' volume: 604 year: '2022' ... --- _id: '33685' abstract: - lang: eng text: In the spatial confinement of cylindrical mesopores with diameters of a few nanometers, water molecules experience restrictions in hydrogen bonding. This leads to a different behavior regarding the molecular orientational freedom (‘structure of water') compared to the bulk liquid state. In addition to the pore size, the behavior is also strongly affected by the strength of the pore wall-to-water interactions, that is, the pore wall polarity. In this work, this is studied both experimentally and theoretically. The surface polarity of mesoporous silica (SiO2) is modified by functionalization with trimethylsilyl moieties, resulting in a change from a hydrophilic (pristine) to a hydrophobic pore wall. The mesopore surface is characterized by N2 and H2O sorption experiments. Those results are combined with IR spectroscopy to investigate pore wall-to-water interactions leading to different structures of water in the mesopore. Furthermore, the water's structure is studied theoretically to gain deeper insight into the interfacial interactions. For this purpose, the structure of water is analyzed by pairing densities, coordination, and angular distributions with a novel adaptation of surface-specific sum-frequency generation calculation for pore environments. article_number: '2200245' article_type: original author: - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Frederik full_name: Zysk, Frederik id: '14757' last_name: Zysk - first_name: Marc full_name: Hartmann, Marc last_name: Hartmann - first_name: Naveen full_name: Kaliannan, Naveen last_name: Kaliannan - first_name: Waldemar full_name: Keil, Waldemar last_name: Keil - first_name: Thomas full_name: Kühne, Thomas id: '49079' last_name: Kühne - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 citation: ama: Weinberger C, Zysk F, Hartmann M, et al. The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity. Advanced Materials Interfaces. 2022;9(20). doi:10.1002/admi.202200245 apa: Weinberger, C., Zysk, F., Hartmann, M., Kaliannan, N., Keil, W., Kühne, T., & Tiemann, M. (2022). The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity. Advanced Materials Interfaces, 9(20), Article 2200245. https://doi.org/10.1002/admi.202200245 bibtex: '@article{Weinberger_Zysk_Hartmann_Kaliannan_Keil_Kühne_Tiemann_2022, title={The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity}, volume={9}, DOI={10.1002/admi.202200245}, number={202200245}, journal={Advanced Materials Interfaces}, publisher={Wiley}, author={Weinberger, Christian and Zysk, Frederik and Hartmann, Marc and Kaliannan, Naveen and Keil, Waldemar and Kühne, Thomas and Tiemann, Michael}, year={2022} }' chicago: Weinberger, Christian, Frederik Zysk, Marc Hartmann, Naveen Kaliannan, Waldemar Keil, Thomas Kühne, and Michael Tiemann. “The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity.” Advanced Materials Interfaces 9, no. 20 (2022). https://doi.org/10.1002/admi.202200245. ieee: 'C. Weinberger et al., “The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity,” Advanced Materials Interfaces, vol. 9, no. 20, Art. no. 2200245, 2022, doi: 10.1002/admi.202200245.' mla: Weinberger, Christian, et al. “The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity.” Advanced Materials Interfaces, vol. 9, no. 20, 2200245, Wiley, 2022, doi:10.1002/admi.202200245. short: C. Weinberger, F. Zysk, M. Hartmann, N. Kaliannan, W. Keil, T. Kühne, M. Tiemann, Advanced Materials Interfaces 9 (2022). date_created: 2022-10-11T08:17:57Z date_updated: 2023-03-03T11:33:24Z department: - _id: '613' - _id: '35' - _id: '2' - _id: '307' - _id: '304' doi: 10.1002/admi.202200245 intvolume: ' 9' issue: '20' keyword: - Mechanical Engineering - Mechanics of Materials language: - iso: eng main_file_link: - open_access: '1' url: https://onlinelibrary.wiley.com/doi/epdf/10.1002/admi.202200245 oa: '1' publication: Advanced Materials Interfaces publication_identifier: issn: - 2196-7350 - 2196-7350 publication_status: published publisher: Wiley quality_controlled: '1' status: public title: The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity type: journal_article user_id: '23547' volume: 9 year: '2022' ... --- _id: '29376' abstract: - lang: eng text: The electrochemical properties of carbonaceous materials produced by hydrothermal carbonization, referred to as hydrochar, can be substantially improved by post-carbonization via pyrolysis. Although these materials have been widely studied for a variety of applications, the mechanisms underlying the pyrolysis are yet poorly understood. This study provides a comprehensive temperature-resolved characterization of the chemical composition, morphology and crystallinity of sucrose-derived hydrochar during pyrolysis. Thermogravimetric analysis, differential scanning calorimetry, and elemental analysis have shown that the dry hydrochar loses about 41% of its dry mass due to the exothermic disintegration of oxygen-containing groups until the carbonization is completed at about 850 °C with a total carbon yield of 93%. The carbonization and aromatization of the initially furanic and keto-aliphatic structure were analyzed by 13C solid-state nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The transition from an amorphous to a nanocrystalline graphitic structure was analyzed using X-ray diffraction and Raman spectroscopy. The pore formation mechanism was examined by helium ion microscopy, transmission electron microscopy, and nitrogen adsorption measurements. The results indicate the formation of oxygen-rich nanoclusters up to 700 °C, which decompose up to 750 °C leaving behind equally sized pores, resulting in a surface area of up to 480 m2/g. article_number: '105404' article_type: original author: - first_name: Martin full_name: Wortmann, Martin last_name: Wortmann - first_name: Waldemar full_name: Keil, Waldemar last_name: Keil - first_name: Bennet full_name: Brockhagen, Bennet last_name: Brockhagen - first_name: Jan full_name: Biedinger, Jan last_name: Biedinger - first_name: Michael full_name: Westphal, Michael last_name: Westphal - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Elise full_name: Diestelhorst, Elise last_name: Diestelhorst - first_name: Wiebke full_name: Hachmann, Wiebke last_name: Hachmann - first_name: Yanjing full_name: Zhao, Yanjing last_name: Zhao - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Günter full_name: Reiss, Günter last_name: Reiss - first_name: Bruno full_name: Hüsgen, Bruno last_name: Hüsgen - first_name: Claudia full_name: Schmidt, Claudia id: '466' last_name: Schmidt orcid: 0000-0003-3179-9997 - first_name: Klaus full_name: Sattler, Klaus last_name: Sattler - first_name: Natalie full_name: Frese, Natalie last_name: Frese citation: ama: Wortmann M, Keil W, Brockhagen B, et al. Pyrolysis of sucrose-derived hydrochar. Journal of Analytical and Applied Pyrolysis. 2022;161. doi:10.1016/j.jaap.2021.105404 apa: Wortmann, M., Keil, W., Brockhagen, B., Biedinger, J., Westphal, M., Weinberger, C., Diestelhorst, E., Hachmann, W., Zhao, Y., Tiemann, M., Reiss, G., Hüsgen, B., Schmidt, C., Sattler, K., & Frese, N. (2022). Pyrolysis of sucrose-derived hydrochar. Journal of Analytical and Applied Pyrolysis, 161, Article 105404. https://doi.org/10.1016/j.jaap.2021.105404 bibtex: '@article{Wortmann_Keil_Brockhagen_Biedinger_Westphal_Weinberger_Diestelhorst_Hachmann_Zhao_Tiemann_et al._2022, title={Pyrolysis of sucrose-derived hydrochar}, volume={161}, DOI={10.1016/j.jaap.2021.105404}, number={105404}, journal={Journal of Analytical and Applied Pyrolysis}, publisher={Elsevier BV}, author={Wortmann, Martin and Keil, Waldemar and Brockhagen, Bennet and Biedinger, Jan and Westphal, Michael and Weinberger, Christian and Diestelhorst, Elise and Hachmann, Wiebke and Zhao, Yanjing and Tiemann, Michael and et al.}, year={2022} }' chicago: Wortmann, Martin, Waldemar Keil, Bennet Brockhagen, Jan Biedinger, Michael Westphal, Christian Weinberger, Elise Diestelhorst, et al. “Pyrolysis of Sucrose-Derived Hydrochar.” Journal of Analytical and Applied Pyrolysis 161 (2022). https://doi.org/10.1016/j.jaap.2021.105404. ieee: 'M. Wortmann et al., “Pyrolysis of sucrose-derived hydrochar,” Journal of Analytical and Applied Pyrolysis, vol. 161, Art. no. 105404, 2022, doi: 10.1016/j.jaap.2021.105404.' mla: Wortmann, Martin, et al. “Pyrolysis of Sucrose-Derived Hydrochar.” Journal of Analytical and Applied Pyrolysis, vol. 161, 105404, Elsevier BV, 2022, doi:10.1016/j.jaap.2021.105404. short: M. Wortmann, W. Keil, B. Brockhagen, J. Biedinger, M. Westphal, C. Weinberger, E. Diestelhorst, W. Hachmann, Y. Zhao, M. Tiemann, G. Reiss, B. Hüsgen, C. Schmidt, K. Sattler, N. Frese, Journal of Analytical and Applied Pyrolysis 161 (2022). date_created: 2022-01-18T06:25:06Z date_updated: 2023-03-08T08:15:24Z department: - _id: '35' - _id: '2' - _id: '307' - _id: '315' doi: 10.1016/j.jaap.2021.105404 intvolume: ' 161' keyword: - Analytical Chemistry - Fuel Technology language: - iso: eng publication: Journal of Analytical and Applied Pyrolysis publication_identifier: issn: - 0165-2370 publication_status: published publisher: Elsevier BV quality_controlled: '1' status: public title: Pyrolysis of sucrose-derived hydrochar type: journal_article user_id: '23547' volume: 161 year: '2022' ... --- _id: '28254' abstract: - lang: eng text: With the rapid advances of functional dielectric metasurfaces and their integration on on-chip nanophotonic devices, the necessity of metasurfaces working in different environments, especially in biological applications, arose. However, the metasurfaces’ performance is tied to the unit cell’s efficiency and ultimately the surrounding environment it was designed for, thus reducing its applicability if exposed to altering refractive index media. Here, we report a method to increase a metasurface’s versatility by covering the high-index metasurface with a low index porous SiO2 film, protecting the metasurface from environmental changes while keeping the working efficiency unchanged. We show, that a covered metasurface retains its functionality even when exposed to fluidic environments. article_type: original author: - first_name: René full_name: Geromel, René last_name: Geromel - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Katja full_name: Brormann, Katja last_name: Brormann - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 citation: ama: Geromel R, Weinberger C, Brormann K, Tiemann M, Zentgraf T. Porous SiO2 coated dielectric metasurface with consistent performance independent of environmental conditions. Optical Materials Express. 2022;12(1):13-21. doi:10.1364/ome.444264 apa: Geromel, R., Weinberger, C., Brormann, K., Tiemann, M., & Zentgraf, T. (2022). Porous SiO2 coated dielectric metasurface with consistent performance independent of environmental conditions. Optical Materials Express, 12(1), 13–21. https://doi.org/10.1364/ome.444264 bibtex: '@article{Geromel_Weinberger_Brormann_Tiemann_Zentgraf_2022, title={Porous SiO2 coated dielectric metasurface with consistent performance independent of environmental conditions}, volume={12}, DOI={10.1364/ome.444264}, number={1}, journal={Optical Materials Express}, publisher={Optica}, author={Geromel, René and Weinberger, Christian and Brormann, Katja and Tiemann, Michael and Zentgraf, Thomas}, year={2022}, pages={13–21} }' chicago: 'Geromel, René, Christian Weinberger, Katja Brormann, Michael Tiemann, and Thomas Zentgraf. “Porous SiO2 Coated Dielectric Metasurface with Consistent Performance Independent of Environmental Conditions.” Optical Materials Express 12, no. 1 (2022): 13–21. https://doi.org/10.1364/ome.444264.' ieee: 'R. Geromel, C. Weinberger, K. Brormann, M. Tiemann, and T. Zentgraf, “Porous SiO2 coated dielectric metasurface with consistent performance independent of environmental conditions,” Optical Materials Express, vol. 12, no. 1, pp. 13–21, 2022, doi: 10.1364/ome.444264.' mla: Geromel, René, et al. “Porous SiO2 Coated Dielectric Metasurface with Consistent Performance Independent of Environmental Conditions.” Optical Materials Express, vol. 12, no. 1, Optica, 2022, pp. 13–21, doi:10.1364/ome.444264. short: R. Geromel, C. Weinberger, K. Brormann, M. Tiemann, T. Zentgraf, Optical Materials Express 12 (2022) 13–21. date_created: 2021-12-02T18:47:42Z date_updated: 2023-03-08T08:13:58Z department: - _id: '15' - _id: '230' - _id: '289' - _id: '623' - _id: '2' - _id: '35' - _id: '307' doi: 10.1364/ome.444264 intvolume: ' 12' issue: '1' language: - iso: eng main_file_link: - open_access: '1' url: https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-12-1-13&id=465602 oa: '1' page: 13-21 publication: Optical Materials Express publication_identifier: issn: - 2159-3930 publication_status: published publisher: Optica quality_controlled: '1' status: public title: Porous SiO2 coated dielectric metasurface with consistent performance independent of environmental conditions type: journal_article user_id: '23547' volume: 12 year: '2022' ... --- _id: '29790' abstract: - lang: eng text: The free exciton transition (near-band-edge emission, NBE) of ZnO at ≈388 nm can be strongly enhanced and even stimulated by an underlying photonic structure. 1D Photonic crystals, so-called distributed Bragg reflectors, are utilized to suppress the deep-level emission of ZnO (DLE, ≈500–530 nm). The reflector stacks are fabricated in a layer-by-layer procedure by wet-chemical synthesis. They consist of low-ε porous SiO2 layers and high-ε TiO2 layers. Varying the thickness of the SiO2 layers allows tuning the optical bandgap in a wide range between ≈420 and 800 nm. A ZnO layer is deposited on top of the reflector stacks by sol–gel synthesis. The spontaneous photoluminescence (PL) emission of the ZnO film is modulated by the photonic structure. When the optical bandgap of the reflector is in resonance with the deep-level emission of ZnO (DLE, ≈500–530 nm), then this defect-related emission mode is suppressed. Strong NBE emission is observed even when the ZnO layer does not show any NBE emission (due to low crystallinity) in the absence of the photonic structure. With this cost-efficient synthesis method, emitters for, e.g., luminescent gas sensors can be fabricated. article_number: '2102357' article_type: original author: - first_name: Linda full_name: Kothe, Linda last_name: Kothe - first_name: Maximilian full_name: Albert, Maximilian last_name: Albert - first_name: Cedrik full_name: Meier, Cedrik id: '20798' last_name: Meier orcid: https://orcid.org/0000-0002-3787-3572 - first_name: Thorsten full_name: Wagner, Thorsten last_name: Wagner - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 citation: ama: Kothe L, Albert M, Meier C, Wagner T, Tiemann M. Stimulation and Enhancement of Near‐Band‐Edge Emission in Zinc Oxide by Distributed Bragg Reflectors. Advanced Materials Interfaces. 2022;9. doi:10.1002/admi.202102357 apa: Kothe, L., Albert, M., Meier, C., Wagner, T., & Tiemann, M. (2022). Stimulation and Enhancement of Near‐Band‐Edge Emission in Zinc Oxide by Distributed Bragg Reflectors. Advanced Materials Interfaces, 9, Article 2102357. https://doi.org/10.1002/admi.202102357 bibtex: '@article{Kothe_Albert_Meier_Wagner_Tiemann_2022, title={Stimulation and Enhancement of Near‐Band‐Edge Emission in Zinc Oxide by Distributed Bragg Reflectors}, volume={9}, DOI={10.1002/admi.202102357}, number={2102357}, journal={Advanced Materials Interfaces}, publisher={Wiley}, author={Kothe, Linda and Albert, Maximilian and Meier, Cedrik and Wagner, Thorsten and Tiemann, Michael}, year={2022} }' chicago: Kothe, Linda, Maximilian Albert, Cedrik Meier, Thorsten Wagner, and Michael Tiemann. “Stimulation and Enhancement of Near‐Band‐Edge Emission in Zinc Oxide by Distributed Bragg Reflectors.” Advanced Materials Interfaces 9 (2022). https://doi.org/10.1002/admi.202102357. ieee: 'L. Kothe, M. Albert, C. Meier, T. Wagner, and M. Tiemann, “Stimulation and Enhancement of Near‐Band‐Edge Emission in Zinc Oxide by Distributed Bragg Reflectors,” Advanced Materials Interfaces, vol. 9, Art. no. 2102357, 2022, doi: 10.1002/admi.202102357.' mla: Kothe, Linda, et al. “Stimulation and Enhancement of Near‐Band‐Edge Emission in Zinc Oxide by Distributed Bragg Reflectors.” Advanced Materials Interfaces, vol. 9, 2102357, Wiley, 2022, doi:10.1002/admi.202102357. short: L. Kothe, M. Albert, C. Meier, T. Wagner, M. Tiemann, Advanced Materials Interfaces 9 (2022). date_created: 2022-02-08T15:24:58Z date_updated: 2025-05-27T07:42:58Z department: - _id: '15' - _id: '35' - _id: '2' - _id: '307' - _id: '230' doi: 10.1002/admi.202102357 intvolume: ' 9' keyword: - Mechanical Engineering - Mechanics of Materials language: - iso: eng main_file_link: - open_access: '1' url: https://onlinelibrary.wiley.com/doi/epdf/10.1002/admi.202102357 oa: '1' publication: Advanced Materials Interfaces publication_identifier: issn: - 2196-7350 - 2196-7350 publication_status: published publisher: Wiley quality_controlled: '1' status: public title: Stimulation and Enhancement of Near‐Band‐Edge Emission in Zinc Oxide by Distributed Bragg Reflectors type: journal_article user_id: '23547' volume: 9 year: '2022' ... --- _id: '25894' abstract: - lang: eng text: Powder X-ray diffraction (XRD) patterns of ordered mesoporous CMK-8 and CMK-9 carbon materials are simulated by geometric modeling. The materials are amorphous at the atomic length scale but exhibit highly symmetric gyroidal structures at the nanometer scale, corresponding to regular, continuous nanopore systems with cubic symmetry. Their structures lead to characteristic low-angle XRD signatures. We introduce a model based on geometrical considerations to simulate CMK-8 and CMK-9 structures with variable volume fraction of carbon (vs. pore volume, i.e., variable 'pore wall thickness'). In addition, we also simulate carbon materials with variable amounts of guest species (e.g., sulfur) residing in their pores. The corresponding XRD patterns are calculated. The carbon volume fraction turns out to have a significant impact on the relative diffraction peak intensities, especially in case of CMK-9 carbon that features a bimodal porosity. Likewise, the presence of guest species in the pores may also strongly affect the relative peak intensities. Our study suggests that careful evaluation of experimental low-angle XRD patterns of (real) CMK-8 or CMK-9 materials offers an opportunity to obtain detailed information about the nanostructural properties in addition to the mere identification of the pore systems geometry. article_number: '110330' article_type: original author: - first_name: Bertram full_name: Schwind, Bertram last_name: Schwind - first_name: Jan-Henrik full_name: Smått, Jan-Henrik last_name: Smått - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger citation: ama: Schwind B, Smått J-H, Tiemann M, Weinberger C. Modeling of gyroidal mesoporous CMK-8 and CMK-9 carbon nanostructures and their X-Ray diffraction patterns. Microporous and Mesoporous Materials. Published online 2021. doi:10.1016/j.micromeso.2020.110330 apa: Schwind, B., Smått, J.-H., Tiemann, M., & Weinberger, C. (2021). Modeling of gyroidal mesoporous CMK-8 and CMK-9 carbon nanostructures and their X-Ray diffraction patterns. Microporous and Mesoporous Materials, Article 110330. https://doi.org/10.1016/j.micromeso.2020.110330 bibtex: '@article{Schwind_Smått_Tiemann_Weinberger_2021, title={Modeling of gyroidal mesoporous CMK-8 and CMK-9 carbon nanostructures and their X-Ray diffraction patterns}, DOI={10.1016/j.micromeso.2020.110330}, number={110330}, journal={Microporous and Mesoporous Materials}, author={Schwind, Bertram and Smått, Jan-Henrik and Tiemann, Michael and Weinberger, Christian}, year={2021} }' chicago: Schwind, Bertram, Jan-Henrik Smått, Michael Tiemann, and Christian Weinberger. “Modeling of Gyroidal Mesoporous CMK-8 and CMK-9 Carbon Nanostructures and Their X-Ray Diffraction Patterns.” Microporous and Mesoporous Materials, 2021. https://doi.org/10.1016/j.micromeso.2020.110330. ieee: 'B. Schwind, J.-H. Smått, M. Tiemann, and C. Weinberger, “Modeling of gyroidal mesoporous CMK-8 and CMK-9 carbon nanostructures and their X-Ray diffraction patterns,” Microporous and Mesoporous Materials, Art. no. 110330, 2021, doi: 10.1016/j.micromeso.2020.110330.' mla: Schwind, Bertram, et al. “Modeling of Gyroidal Mesoporous CMK-8 and CMK-9 Carbon Nanostructures and Their X-Ray Diffraction Patterns.” Microporous and Mesoporous Materials, 110330, 2021, doi:10.1016/j.micromeso.2020.110330. short: B. Schwind, J.-H. Smått, M. Tiemann, C. Weinberger, Microporous and Mesoporous Materials (2021). date_created: 2021-10-08T10:02:31Z date_updated: 2023-03-07T10:44:44Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.1016/j.micromeso.2020.110330 language: - iso: eng publication: Microporous and Mesoporous Materials publication_identifier: issn: - 1387-1811 publication_status: published quality_controlled: '1' status: public title: Modeling of gyroidal mesoporous CMK-8 and CMK-9 carbon nanostructures and their X-Ray diffraction patterns type: journal_article user_id: '23547' year: '2021' ... --- _id: '25897' abstract: - lang: eng text: A comparison of infrared spectroscopic analytical approaches was made in order to assess their applicability for internal structure characterization of SiO2 thin films. Markers for porosity and/or disorder based on the analysis of the asymmetric stretching absorption band of SiO2 between 900−1350 cm−1 were discussed. The shape of this band, which shows a well-defined LO–TO splitting, depends not only on the inherent characteristics of the film under analysis but also on the particular geometry of the IR experiment and the specific surface selection rules of the substrate. Three types of SiO2 thin films with clearly defined porosity ranging from dense films to mesoporous films were investigated by transmission (at different incidence angles), direct specular reflection (at different angles), and diffuse reflection. Two different types of substrate, metallic and semiconducting, were used. The combined effect of substrate and specific technique in the final shape of the band, was discussed, and the efficacy for their applicability to the determination of porosity in thin SiO2 films was critically evaluated. article_number: '103256' article_type: original author: - first_name: Teresa full_name: de los Arcos, Teresa last_name: de los Arcos - first_name: Hendrik full_name: Müller, Hendrik last_name: Müller - first_name: Fuzeng full_name: Wang, Fuzeng last_name: Wang - first_name: Varun Raj full_name: Damerla, Varun Raj last_name: Damerla - first_name: Christian full_name: Hoppe, Christian last_name: Hoppe - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Guido full_name: Grundmeier, Guido id: '194' last_name: Grundmeier citation: ama: de los Arcos T, Müller H, Wang F, et al. Review of infrared spectroscopy techniques for the determination of internal structure in thin SiO2 films. Vibrational Spectroscopy. Published online 2021. doi:10.1016/j.vibspec.2021.103256 apa: de los Arcos, T., Müller, H., Wang, F., Damerla, V. R., Hoppe, C., Weinberger, C., Tiemann, M., & Grundmeier, G. (2021). Review of infrared spectroscopy techniques for the determination of internal structure in thin SiO2 films. Vibrational Spectroscopy, Article 103256. https://doi.org/10.1016/j.vibspec.2021.103256 bibtex: '@article{de los Arcos_Müller_Wang_Damerla_Hoppe_Weinberger_Tiemann_Grundmeier_2021, title={Review of infrared spectroscopy techniques for the determination of internal structure in thin SiO2 films}, DOI={10.1016/j.vibspec.2021.103256}, number={103256}, journal={Vibrational Spectroscopy}, author={de los Arcos, Teresa and Müller, Hendrik and Wang, Fuzeng and Damerla, Varun Raj and Hoppe, Christian and Weinberger, Christian and Tiemann, Michael and Grundmeier, Guido}, year={2021} }' chicago: Arcos, Teresa de los, Hendrik Müller, Fuzeng Wang, Varun Raj Damerla, Christian Hoppe, Christian Weinberger, Michael Tiemann, and Guido Grundmeier. “Review of Infrared Spectroscopy Techniques for the Determination of Internal Structure in Thin SiO2 Films.” Vibrational Spectroscopy, 2021. https://doi.org/10.1016/j.vibspec.2021.103256. ieee: 'T. de los Arcos et al., “Review of infrared spectroscopy techniques for the determination of internal structure in thin SiO2 films,” Vibrational Spectroscopy, Art. no. 103256, 2021, doi: 10.1016/j.vibspec.2021.103256.' mla: de los Arcos, Teresa, et al. “Review of Infrared Spectroscopy Techniques for the Determination of Internal Structure in Thin SiO2 Films.” Vibrational Spectroscopy, 103256, 2021, doi:10.1016/j.vibspec.2021.103256. short: T. de los Arcos, H. Müller, F. Wang, V.R. Damerla, C. Hoppe, C. Weinberger, M. Tiemann, G. Grundmeier, Vibrational Spectroscopy (2021). date_created: 2021-10-08T10:09:45Z date_updated: 2023-03-07T10:44:06Z department: - _id: '35' - _id: '2' - _id: '307' - _id: '302' doi: 10.1016/j.vibspec.2021.103256 language: - iso: eng publication: Vibrational Spectroscopy publication_identifier: issn: - 0924-2031 publication_status: published quality_controlled: '1' status: public title: Review of infrared spectroscopy techniques for the determination of internal structure in thin SiO2 films type: journal_article user_id: '23547' year: '2021' ... --- _id: '25893' abstract: - lang: eng text: Tailor-made ordered mesoporous materials bear great potential in numerous fields of application where large interfaces are required. However, the inherent surfacechemical properties of conventional materials, such as silica, carbon or organosilica, poses some limitations with respect to their application. Surface manipulation by functionalization with chemically more reactive groups is one way to improve materials for their desired purpose. Another approach is the design of high surface-area composite materials. The surface manipulation, either by functionalization or by introducing guest species, can be performed selectively. This means that when several distinct, i.e. , hierarchical, types of surfaces or pore systems exist in a material, each of them may be chosen for manipulation. Several strategies can be identified to achieve this goal. Molecules or molecule assemblies can be utilized to temporarily protect pores or surfaces (soft protection), while manipulation occurs at the accessible sites. This approach is a recurring motive in this review and can also be applied to rigid template matrices (hard protection). Furthermore, the size of functionalization agents (size protection) and their reactivity/diffusion (kinetic protection) into the pores can also be utilized to achieve selectivity. In addition, challenges in the synthesis and characterization of selectively manipulated ordered mesoporous materials are discussed. article_number: '2001153' article_type: review author: - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger citation: ama: Tiemann M, Weinberger C. Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials. Advanced Materials Interfaces. Published online 2021. doi:10.1002/admi.202001153 apa: Tiemann, M., & Weinberger, C. (2021). Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials. Advanced Materials Interfaces, Article 2001153. https://doi.org/10.1002/admi.202001153 bibtex: '@article{Tiemann_Weinberger_2021, title={Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials}, DOI={10.1002/admi.202001153}, number={2001153}, journal={Advanced Materials Interfaces}, author={Tiemann, Michael and Weinberger, Christian}, year={2021} }' chicago: Tiemann, Michael, and Christian Weinberger. “Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials.” Advanced Materials Interfaces, 2021. https://doi.org/10.1002/admi.202001153. ieee: 'M. Tiemann and C. Weinberger, “Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials,” Advanced Materials Interfaces, Art. no. 2001153, 2021, doi: 10.1002/admi.202001153.' mla: Tiemann, Michael, and Christian Weinberger. “Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials.” Advanced Materials Interfaces, 2001153, 2021, doi:10.1002/admi.202001153. short: M. Tiemann, C. Weinberger, Advanced Materials Interfaces (2021). date_created: 2021-10-08T10:01:21Z date_updated: 2023-03-07T10:45:40Z department: - _id: '35' - _id: '2' - _id: '307' doi: 10.1002/admi.202001153 language: - iso: eng main_file_link: - open_access: '1' url: https://onlinelibrary.wiley.com/doi/epdf/10.1002/admi.202001153 oa: '1' publication: Advanced Materials Interfaces publication_identifier: issn: - 2196-7350 - 2196-7350 publication_status: published quality_controlled: '1' status: public title: Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials type: journal_article user_id: '23547' year: '2021' ... --- _id: '25896' abstract: - lang: eng text: In this report, a flame spray pyrolysis setup has been examined with various in situ extraction methods of particle samples along the flame axis. First, two precursor formulations leading to the formation of iron oxide nanoparticles were used in a standardized SpraySyn burner system, and the final particle outcome was characterized by a broad range of established powder characterization techniques (TEM/HRTEM, SAXS, XRD, BET). The characterization of the powder products evidenced that mostly homogeneous gas-to-particle conversion takes place when applying an acidic precursor solution, whereas the absence of the acid leads to a dominant droplet-to-particle pathway. Our study indicates that a droplet-to-particle-pathway could be present even when processing the acidic formulation. However, even if a secondary pathway might take place in this case as well, it is not dominant and nearly negligible. Subsequently, the in situ particle structure evolution was investigated for the dominant gas-to-particle pathway, and particles were extracted along the flame axis for online SMPS and offline TEM/HRTEM analysis. Due to the highly reactive conditions within the flame (high temperatures, turbulent flow field, high particle number concentrations), the extraction of representative samples from spray flames is challenging. In order to handle the reactive conditions, two extraction techniques were tailored in this report. To extract an aerosol sample within the flame for SMPS measurement, a Hole in a Tube probe was adjusted. Thus, the mobility particle diameter as well as the corresponding distribution widths were obtained at different heights above the burner along the flame axis. For TEM/HRTEM image analysis, particle samples were collected thermophoretically by means of a tailored shutter system. Since all sampling grids were protected until reaching the flame axis and due to the low sampling time, momentary captures of local particle structures could be extracted precisely. The particle morphologies have clearly shown an evolution from spherical and paired particles in the flame center to fractal and compact agglomerates at later synthesis stages. article_number: '105722' article_type: original author: - first_name: R. full_name: Tischendorf, R. last_name: Tischendorf - first_name: M. full_name: Simmler, M. last_name: Simmler - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: M. full_name: Bieber, M. last_name: Bieber - first_name: M. full_name: Reddemann, M. last_name: Reddemann - first_name: F. full_name: Fröde, F. last_name: Fröde - first_name: J. full_name: Lindner, J. last_name: Lindner - first_name: H. full_name: Pitsch, H. last_name: Pitsch - first_name: R. full_name: Kneer, R. last_name: Kneer - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: H. full_name: Nirschl, H. last_name: Nirschl - first_name: H.-J. full_name: Schmid, H.-J. last_name: Schmid citation: ama: Tischendorf R, Simmler M, Weinberger C, et al. Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques. Journal of Aerosol Science. Published online 2021. doi:10.1016/j.jaerosci.2020.105722 apa: Tischendorf, R., Simmler, M., Weinberger, C., Bieber, M., Reddemann, M., Fröde, F., Lindner, J., Pitsch, H., Kneer, R., Tiemann, M., Nirschl, H., & Schmid, H.-J. (2021). Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques. Journal of Aerosol Science, Article 105722. https://doi.org/10.1016/j.jaerosci.2020.105722 bibtex: '@article{Tischendorf_Simmler_Weinberger_Bieber_Reddemann_Fröde_Lindner_Pitsch_Kneer_Tiemann_et al._2021, title={Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques}, DOI={10.1016/j.jaerosci.2020.105722}, number={105722}, journal={Journal of Aerosol Science}, author={Tischendorf, R. and Simmler, M. and Weinberger, Christian and Bieber, M. and Reddemann, M. and Fröde, F. and Lindner, J. and Pitsch, H. and Kneer, R. and Tiemann, Michael and et al.}, year={2021} }' chicago: Tischendorf, R., M. Simmler, Christian Weinberger, M. Bieber, M. Reddemann, F. Fröde, J. Lindner, et al. “Examination of the Evolution of Iron Oxide Nanoparticles in Flame Spray Pyrolysis by Tailored in Situ Particle Sampling Techniques.” Journal of Aerosol Science, 2021. https://doi.org/10.1016/j.jaerosci.2020.105722. ieee: 'R. Tischendorf et al., “Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques,” Journal of Aerosol Science, Art. no. 105722, 2021, doi: 10.1016/j.jaerosci.2020.105722.' mla: Tischendorf, R., et al. “Examination of the Evolution of Iron Oxide Nanoparticles in Flame Spray Pyrolysis by Tailored in Situ Particle Sampling Techniques.” Journal of Aerosol Science, 105722, 2021, doi:10.1016/j.jaerosci.2020.105722. short: R. Tischendorf, M. Simmler, C. Weinberger, M. Bieber, M. Reddemann, F. Fröde, J. Lindner, H. Pitsch, R. Kneer, M. Tiemann, H. Nirschl, H.-J. Schmid, Journal of Aerosol Science (2021). date_created: 2021-10-08T10:07:18Z date_updated: 2023-03-08T08:07:30Z department: - _id: '9' - _id: '35' - _id: '2' - _id: '307' doi: 10.1016/j.jaerosci.2020.105722 language: - iso: eng publication: Journal of Aerosol Science publication_identifier: issn: - 0021-8502 publication_status: published quality_controlled: '1' status: public title: Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques type: journal_article user_id: '23547' year: '2021' ... --- _id: '22635' abstract: - lang: eng text: Photodynamic therapy (PDT) using TiO2 nanoparticles has become an important alternative treatment for different types of cancer due to their high photocatalytic activity and high absorption of UV-A light. To potentiate this treatment, we have coated commercial glass plates with TiO2 nanoparticles prepared by the sol–gel method (TiO2-m), which exhibit a remarkable selectivity for the irreversible trapping of cancer cells. The physicochemical properties of the deposited TiO2-m nanoparticle coatings have been characterized by a number of complementary surface-analytical techniques and their interaction with leukemia and healthy blood cells were investigated. Scanning electron and atomic force microscopy verify the formation of a compact layer of TiO2-m nanoparticles. The particles are predominantly in the anatase phase and have hydroxyl-terminated surfaces as revealed by Raman, X-ray photoelectron, and infrared spectroscopy, as well as X-ray diffraction. We find that lymphoblastic leukemia cells adhere to the TiO2-m coating and undergo amoeboid-like migration, whereas lymphocytic cells show distinctly weaker interactions with the coating. This evidences the potential of this nanomaterial coating to selectively trap cancer cells and renders it a promising candidate for the development of future prototypes of PDT devices for the treatment of leukemia and other types of cancers with non-adherent cells. article_type: original author: - first_name: Jaime Andres full_name: Garcia Diosa, Jaime Andres last_name: Garcia Diosa - first_name: Alejandro full_name: Gonzalez Orive, Alejandro last_name: Gonzalez Orive - first_name: Christian full_name: Weinberger, Christian id: '11848' last_name: Weinberger - first_name: Sabrina full_name: Schwiderek, Sabrina last_name: Schwiderek - first_name: Steffen full_name: Knust, Steffen last_name: Knust - first_name: Michael full_name: Tiemann, Michael id: '23547' last_name: Tiemann orcid: 0000-0003-1711-2722 - first_name: Guido full_name: Grundmeier, Guido id: '194' last_name: Grundmeier - first_name: Adrian full_name: Keller, Adrian id: '48864' last_name: Keller orcid: 0000-0001-7139-3110 - first_name: Ruben Jesus full_name: Camargo Amado, Ruben Jesus last_name: Camargo Amado citation: ama: 'Garcia Diosa JA, Gonzalez Orive A, Weinberger C, et al. TiO2 nanoparticle coatings on glass surfaces for the selective trapping of leukemia cells from peripheral blood. Journal of Biomedical Materials Research Part B: Applied Biomaterials. 2021;109:2142–2153. doi:10.1002/jbm.b.34862' apa: 'Garcia Diosa, J. A., Gonzalez Orive, A., Weinberger, C., Schwiderek, S., Knust, S., Tiemann, M., Grundmeier, G., Keller, A., & Camargo Amado, R. J. (2021). TiO2 nanoparticle coatings on glass surfaces for the selective trapping of leukemia cells from peripheral blood. Journal of Biomedical Materials Research Part B: Applied Biomaterials, 109, 2142–2153. https://doi.org/10.1002/jbm.b.34862' bibtex: '@article{Garcia Diosa_Gonzalez Orive_Weinberger_Schwiderek_Knust_Tiemann_Grundmeier_Keller_Camargo Amado_2021, title={TiO2 nanoparticle coatings on glass surfaces for the selective trapping of leukemia cells from peripheral blood}, volume={109}, DOI={10.1002/jbm.b.34862}, journal={Journal of Biomedical Materials Research Part B: Applied Biomaterials}, author={Garcia Diosa, Jaime Andres and Gonzalez Orive, Alejandro and Weinberger, Christian and Schwiderek, Sabrina and Knust, Steffen and Tiemann, Michael and Grundmeier, Guido and Keller, Adrian and Camargo Amado, Ruben Jesus}, year={2021}, pages={2142–2153} }' chicago: 'Garcia Diosa, Jaime Andres, Alejandro Gonzalez Orive, Christian Weinberger, Sabrina Schwiderek, Steffen Knust, Michael Tiemann, Guido Grundmeier, Adrian Keller, and Ruben Jesus Camargo Amado. “TiO2 Nanoparticle Coatings on Glass Surfaces for the Selective Trapping of Leukemia Cells from Peripheral Blood.” Journal of Biomedical Materials Research Part B: Applied Biomaterials 109 (2021): 2142–2153. https://doi.org/10.1002/jbm.b.34862.' ieee: 'J. A. Garcia Diosa et al., “TiO2 nanoparticle coatings on glass surfaces for the selective trapping of leukemia cells from peripheral blood,” Journal of Biomedical Materials Research Part B: Applied Biomaterials, vol. 109, pp. 2142–2153, 2021, doi: 10.1002/jbm.b.34862.' mla: 'Garcia Diosa, Jaime Andres, et al. “TiO2 Nanoparticle Coatings on Glass Surfaces for the Selective Trapping of Leukemia Cells from Peripheral Blood.” Journal of Biomedical Materials Research Part B: Applied Biomaterials, vol. 109, 2021, pp. 2142–2153, doi:10.1002/jbm.b.34862.' short: 'J.A. Garcia Diosa, A. Gonzalez Orive, C. Weinberger, S. Schwiderek, S. Knust, M. Tiemann, G. Grundmeier, A. Keller, R.J. Camargo Amado, Journal of Biomedical Materials Research Part B: Applied Biomaterials 109 (2021) 2142–2153.' date_created: 2021-07-08T11:34:21Z date_updated: 2023-03-08T08:10:25Z department: - _id: '302' - _id: '307' - _id: '35' - _id: '2' doi: 10.1002/jbm.b.34862 intvolume: ' 109' language: - iso: eng page: 2142–2153 publication: 'Journal of Biomedical Materials Research Part B: Applied Biomaterials' publication_identifier: issn: - 1552-4973 - 1552-4981 publication_status: published quality_controlled: '1' status: public title: TiO2 nanoparticle coatings on glass surfaces for the selective trapping of leukemia cells from peripheral blood type: journal_article user_id: '23547' volume: 109 year: '2021' ...