@article{33687, author = {{Odziomek, Mateusz and Giusto, Paolo and Kossmann, Janina and Tarakina, Nadezda V. and Heske, Julian Joachim and Rivadeneira, Salvador M. and Keil, Waldemar and Schmidt, Claudia and Mazzanti, Stefano and Savateev, Oleksandr and Perdigón‐Toro, Lorena and Neher, Dieter and Kühne, Thomas and Antonietti, Markus and López‐Salas, Nieves}}, issn = {{0935-9648}}, journal = {{Advanced Materials}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, number = {{40}}, publisher = {{Wiley}}, title = {{{“Red Carbon”: A Rediscovered Covalent Crystalline Semiconductor}}}, doi = {{10.1002/adma.202206405}}, volume = {{34}}, year = {{2022}}, } @article{29376, abstract = {{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.}}, 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 Reiss, Günter and Hüsgen, Bruno and Schmidt, Claudia and Sattler, Klaus and Frese, Natalie}}, issn = {{0165-2370}}, journal = {{Journal of Analytical and Applied Pyrolysis}}, keywords = {{Analytical Chemistry, Fuel Technology}}, publisher = {{Elsevier BV}}, title = {{{Pyrolysis of sucrose-derived hydrochar}}}, doi = {{10.1016/j.jaap.2021.105404}}, volume = {{161}}, year = {{2022}}, } @article{35327, author = {{Wortmann, Martin and Viertel, Klaus and Welle, Alexander and Keil, Waldemar and Frese, Natalie and Hachmann, Wiebke and Krieger, Philipp and Brikmann, Johannes and Schmidt, Claudia and Moritzer, Elmar and Hüsgen, Bruno}}, issn = {{0017-9310}}, journal = {{International Journal of Heat and Mass Transfer}}, keywords = {{Fluid Flow and Transfer Processes, Mechanical Engineering, Condensed Matter Physics}}, publisher = {{Elsevier BV}}, title = {{{Anomalous bulk diffusion of methylene diphenyl diisocyanate in silicone elastomer}}}, doi = {{10.1016/j.ijheatmasstransfer.2021.121536}}, volume = {{177}}, year = {{2021}}, } @article{35326, abstract = {{Thermostable compartmentalized sodium-water sites through intercalated γ-aminopropyl-dimethyl-ethoxy silane in synthetic hectorite.}}, author = {{Keil, Waldemar and Zhao, Kai and Oswald, Arthur and Bremser, Wolfgang and Schmidt, Claudia and Hintze-Bruening, Horst}}, issn = {{1463-9076}}, journal = {{Physical Chemistry Chemical Physics}}, keywords = {{Physical and Theoretical Chemistry, General Physics and Astronomy}}, number = {{1}}, pages = {{477--487}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Thermostable water reservoirs in the interlayer space of a sodium hectorite clay through the intercalation of γ-aminopropyl(dimethyl)ethoxysilane in toluene}}}, doi = {{10.1039/d1cp03321b}}, volume = {{24}}, year = {{2021}}, } @article{35328, author = {{Wortmann, Martin and Frese, Natalie and Keil, Waldemar and Brikmann, Johannes and Biedinger, Jan and Brockhagen, Bennet and Reiss, Günter and Schmidt, Claudia and Gölzhäuser, Armin and Moritzer, Elmar and Hüsgen, Bruno}}, issn = {{2637-6105}}, journal = {{ACS Applied Polymer Materials}}, keywords = {{Organic Chemistry, Polymers and Plastics, Process Chemistry and Technology}}, number = {{11}}, pages = {{4719--4732}}, publisher = {{American Chemical Society (ACS)}}, title = {{{The Deterioration Mechanism of Silicone Molds in Polyurethane Vacuum Casting}}}, doi = {{10.1021/acsapm.0c00744}}, volume = {{2}}, year = {{2020}}, } @article{25901, abstract = {{Thermally stabilized and subsequently carbonized nanofibers are a promising material for many technical applications in fields such as tissue engineering or energy storage. They can be obtained from a variety of different polymer precursors via electrospinning. While some methods have been tested for post-carbonization doping of nanofibers with the desired ingredients, very little is known about carbonization of blend nanofibers from two or more polymeric precursors. In this paper, we report on the preparation, thermal treatment and resulting properties of poly(acrylonitrile) (PAN)/poly(vinylidene fluoride) (PVDF) blend nanofibers produced by wire-based electrospinning of binary polymer solutions. Using a wide variety of spectroscopic, microscopic and thermal characterization methods, the chemical and morphological transition during oxidative stabilization (280 °C) and incipient carbonization (500 °C) was thoroughly investigated. Both PAN and PVDF precursor polymers were detected and analyzed qualitatively and quantitatively during all stages of thermal treatment. Compared to pure PAN nanofibers, the blend nanofibers showed increased fiber diameters, strong reduction of undesired morphological changes during oxidative stabilization and increased conductivity after carbonization.}}, author = {{Wortmann, Martin and Frese, Natalie and Mamun, Al and Trabelsi, Marah and Keil, Waldemar and Büker, Björn and Javed, Ali and Tiemann, Michael and Moritzer, Elmar and Ehrmann, Andrea and Hütten, Andreas and Schmidt, Claudia and Gölzhäuser, Armin and Hüsgen, Bruno and Sabantina, Lilia}}, issn = {{2079-4991}}, journal = {{Nanomaterials}}, title = {{{Chemical and Morphological Transition of Poly(acrylonitrile)/Poly(vinylidene Fluoride) Blend Nanofibers during Oxidative Stabilization and Incipient Carbonization}}}, doi = {{10.3390/nano10061210}}, year = {{2020}}, } @article{35398, abstract = {{The Haller relationship was applied to estimate the nematic order parameter S from 1H NMR spectra of fully protonated liquid crystals aligned in the magnetic field. The NMR line shapes were approximated as doublets of very broad peaks. Both the temperature-dependent doublet Splitting and the full width at half maximum of the whole spectra were used for Haller extrapolation. The order parameters obtained with the proposed approach for 4-cyano-4'-pentylbiphenyl (5CB) and the nematic mixture E7 were found to be in good agreement with previously reports.}}, author = {{Tang, Ming-xue and Schmidt, Claudia}}, journal = {{Chinese Journal of Magnetic Resonance}}, keywords = {{nematic liquid crystal, order parameter, Haller analysis, 1H NMR}}, pages = {{138--147}}, title = {{{Estimation of Nematic Order Parameters via Haller Analysis of 1H NMR Spectra of Liquid Crystals }}}, doi = {{10.11938/cjmr20182685 }}, volume = {{36}}, year = {{2019}}, } @article{25907, abstract = {{The combined benefits of moisture-stable phosphonic acids and mesoporous silica materials (SBA-15 and MCM-41) as large-surface-area solid supports offer new opportunities for several applications, such as catalysis or drug delivery. We present a comprehensive study of a straightforward synthesis method via direct immobilization of several phosphonic acids and phosphoric acid esters on various mesoporous silicas in a Dean–Stark apparatus with toluene as the solvent. Due to the utilization of azeotropic distillation, there was no need to dry phosphonic acids, phosphoric acid esters, solvents, or silicas prior to synthesis. In addition to modeling phosphonic acids, immobilization of the important biomolecule adenosine monophosphate (AMP) on the porous supports was also investigated. Due to the high surface area of the mesoporous silicas, a possible catalytic application based on immobilization of an organocatalyst for an asymmetric aldol reaction is discussed.}}, author = {{Weinberger, Christian and Heckel, Tatjana and Schnippering, Patrick and Schmitz, Markus and Guo, Anpeng and Keil, Waldemar and Marsmann, Heinrich C. and Schmidt, Claudia and Tiemann, Michael and Wilhelm, René}}, issn = {{2079-4991}}, journal = {{Nanomaterials}}, title = {{{Straightforward Immobilization of Phosphonic Acids and Phosphoric Acid Esters on Mesoporous Silica and Their Application in an Asymmetric Aldol Reaction}}}, doi = {{10.3390/nano9020249}}, year = {{2019}}, } @article{5971, author = {{Kuczera, Stefan and Gentile, Luigi and Brox, Timothy I. and Olsson, Ulf and Schmidt, Claudia and Galvosas, Petrik}}, issn = {{0743-7463}}, journal = {{Langmuir}}, number = {{28}}, pages = {{8314--8325}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Multilamellar Vesicle Formation Probed by Rheo-NMR and Rheo-SALS under Large Amplitude Oscillatory Shear}}}, doi = {{10.1021/acs.langmuir.8b01510}}, volume = {{34}}, year = {{2018}}, } @article{35330, abstract = {{Gelled lyotropic liquid crystals can be formed by adding a gelator to a mixture of surfactant and solvent. If the gel network and the liquid-crystalline phase coexist without influencing each other, the self-assembly is called orthogonal. In this study, the influence of the organogelator 12-hydroxyoctadecanoic acid (12-HOA) on the lamellar and hexagonal liquid crystalline phases of the binary system H2O–C12E7 (heptaethylene glycol monododecyl ether) is investigated. More precisely, we added 12-HOA at mass fractions from 0.015 to 0.05 and studied the resulting phase diagram of the system H2O–C12E7 by visual observation of birefringence and by 2H NMR spectroscopy. In addition, the dynamic shear moduli of the samples were measured in order to examine their gel character. The results show that 12-HOA is partly acting as co-surfactant, manifested by the destabilization of the hexagonal phase and the stabilization of the lamellar phase. The higher the total surfactant concentration, the more 12-HOA is incorporated in the surfactant layer. Accordingly, its gelation capacity is substantially reduced in the surfactant solution compared to the system 12-HOA–n-decane, and large amounts of gelator are required for gels to form, especially in the lamellar phase.}}, author = {{Steck, Katja and Schmidt, Claudia and Stubenrauch, Cosima}}, issn = {{2310-2861}}, journal = {{Gels}}, keywords = {{Polymers and Plastics, Organic Chemistry, Biomaterials, Bioengineering}}, number = {{3}}, publisher = {{MDPI AG}}, title = {{{The Twofold Role of 12-Hydroxyoctadecanoic Acid (12-HOA) in a Ternary Water—Surfactant—12-HOA System: Gelator and Co-Surfactant}}}, doi = {{10.3390/gels4030078}}, volume = {{4}}, year = {{2018}}, } @article{35332, author = {{Xu, Yang and Laupheimer, Michaela and Preisig, Natalie and Sottmann, Thomas and Schmidt, Claudia and Stubenrauch, Cosima}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{31}}, pages = {{8589--8598}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Gelled Lyotropic Liquid Crystals}}}, doi = {{10.1021/acs.langmuir.5b01992}}, volume = {{31}}, year = {{2015}}, } @inbook{35331, author = {{Grewe, Felix and Ortmeyer, Jochen and Haase, Roxana and Schmidt, Claudia}}, booktitle = {{Colloid Process Engineering}}, isbn = {{9783319151281}}, publisher = {{Springer International Publishing}}, title = {{{Colloidal Gels Formed by Dilute Aqueous Dispersions of Surfactant and Fatty Alcohol}}}, doi = {{10.1007/978-3-319-15129-8_2}}, year = {{2015}}, } @misc{35333, author = {{Schmidt, Claudia}}, title = {{{Rheo-nuclear magnetic resonance spectroscopy}}}, volume = {{Vol. 26 Issue 6}}, year = {{2014}}, } @article{35341, abstract = {{Abstract Flow fields and shear-induced structures in the lamellar (L α ) phase of the system triethylene glycol mono n-decyl ether (C10E3)/water were investigated by NMR velocimetry, diffusometry, and 2 H NMR spectroscopy. The transformation from multilamellar vesicles (MLVs) to aligned planar lamellae is accompanied by a transient gradient shear banding. A high-shear-rate band of aligned lamellae forms next to the moving inner wall of the cylindrical Couette shear cell while a low-shear-rate band of the initial MLV structure remains close to the outer stationary wall. The band of layers grows at the expense of the band of MLVs until the transformation is completed. This process scales with the applied strain. Wall slip is a characteristic of the MLV state, while aligned layers show no deviation from Newtonian flow. The homogeneous nature of the opposite transformation from well aligned layers to MLVs via an intermediate structure resembling undulated multilamellar cylinders is confirmed. The strain dependence of this transformation appears to be independent of temperature. The shear diagram, which represents the shear-induced structures as a function of temperature and shear rate, contains a transition region between stable layers and stable MLVs. The steady-state structures in the transition region show a continuous change from layer-like at high temperature to MLV-like at lower temperature. These structures are homogeneous on a length scale above a few micrometers.}}, author = {{Medronho, Bruno and Olsson, Ulf and Schmidt, Claudia and Galvosas, Petrik}}, issn = {{2196-7156}}, journal = {{Zeitschrift für Physikalische Chemie}}, keywords = {{Physical and Theoretical Chemistry}}, number = {{11-12}}, pages = {{1293--1314}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Transient and Steady-State Shear Banding in a Lamellar Phase as Studied by Rheo-NMR}}}, doi = {{10.1524/zpch.2012.0313}}, volume = {{226}}, year = {{2012}}, } @article{35336, author = {{Quiñones, Javier Pérez and Gothelf, Kurt V. and Kjems, Jørgen and Heras, Angeles and Schmidt, Claudia and Peniche, Carlos}}, issn = {{2157-9083}}, journal = {{Journal of Biomaterials and Tissue Engineering}}, keywords = {{Biomedical Engineering, Medicine (miscellaneous), Bioengineering, Biotechnology}}, number = {{1}}, pages = {{164--172}}, publisher = {{American Scientific Publishers}}, title = {{{Novel Self-Assembled Nanoparticles of Testosterone-Modified Glycol Chitosan and Fructose Chitosan for Controlled Release}}}, doi = {{10.1166/jbt.2013.1071}}, volume = {{3}}, year = {{2012}}, } @article{35334, author = {{Bilalov, Azat and Elsing, Jonas and Haas, Eva and Schmidt, Claudia and Olsson, Ulf}}, issn = {{0021-9797}}, journal = {{Journal of Colloid and Interface Science}}, keywords = {{Colloid and Surface Chemistry, Surfaces, Coatings and Films, Biomaterials, Electronic, Optical and Magnetic Materials}}, pages = {{360--367}}, publisher = {{Elsevier BV}}, title = {{{Embedding DNA in surfactant mesophases: The phase diagram of the ternary system dodecyltrimethylammonium–DNA/monoolein/water in comparison to the DNA-free analogue}}}, doi = {{10.1016/j.jcis.2012.11.067}}, volume = {{394}}, year = {{2012}}, } @article{35340, author = {{Stubenrauch, Cosima and Kleinschmidt, Felix and Schmidt, Claudia}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{25}}, pages = {{9206--9210}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Structural Evolution in the Isotropic Channel of a Water–Nonionic Surfactant System That Has a Disconnected Lamellar Phase: A 1H NMR Self-Diffusion Study}}}, doi = {{10.1021/la301948d}}, volume = {{28}}, year = {{2012}}, } @article{35335, author = {{Quiñones, Javier Pérez and Gothelf, Kurt Vesterager and Kjems, Jørgen and Caballero, Ángeles María Heras and Schmidt, Claudia and Covas, Carlos Peniche}}, issn = {{0144-8617}}, journal = {{Carbohydrate Polymers}}, keywords = {{Materials Chemistry, Polymers and Plastics, Organic Chemistry}}, number = {{1}}, pages = {{143--151}}, publisher = {{Elsevier BV}}, title = {{{N,O6-partially acetylated chitosan nanoparticles hydrophobically-modified for controlled release of steroids and vitamin E}}}, doi = {{10.1016/j.carbpol.2012.07.080}}, volume = {{91}}, year = {{2012}}, } @article{35339, author = {{Quiñones, Javier Pérez and Gothelf, Kurt Vesterager and Kjems, Jørgen and Caballero, Ángeles María Heras and Schmidt, Claudia and Covas, Carlos Peniche}}, issn = {{0144-8617}}, journal = {{Carbohydrate Polymers}}, keywords = {{Materials Chemistry, Polymers and Plastics, Organic Chemistry}}, number = {{4}}, pages = {{1373--1377}}, publisher = {{Elsevier BV}}, title = {{{Self-assembled nanoparticles of glycol chitosan – Ergocalciferol succinate conjugate, for controlled release}}}, doi = {{10.1016/j.carbpol.2012.02.039}}, volume = {{88}}, year = {{2012}}, } @article{35337, author = {{Quiñones, Javier Pérez and Gothelf, Kurt Vesterager and Kjems, Jørgen and Yang, Chuanxu and Caballero, Angeles María Heras and Schmidt, Claudia and Covas, Carlos Peniche}}, issn = {{0144-8617}}, journal = {{Carbohydrate Polymers}}, keywords = {{Materials Chemistry, Polymers and Plastics, Organic Chemistry}}, number = {{1}}, pages = {{856--864}}, publisher = {{Elsevier BV}}, title = {{{Self-assembled nanoparticles of modified-chitosan conjugates for the sustained release of dl-α-tocopherol}}}, doi = {{10.1016/j.carbpol.2012.10.005}}, volume = {{92}}, year = {{2012}}, }