@article{15957,
author = {{Hengsbach, Florian and Koppa, Peter and Holzweissig, Martin Joachim and Aydinöz, Mehmet Esat and Taube, Alexander and Hoyer, Kay-Peter and Starykov, Oleksiy and Tonn, Babette and Niendorf, Thomas and Tröster, Thomas and Schaper, Mirko}},
issn = {{2363-9512}},
journal = {{Progress in Additive Manufacturing}},
pages = {{221--231}},
title = {{{Inline additively manufactured functionally graded multi-materials: microstructural and mechanical characterization of 316L parts with H13 layers}}},
doi = {{10.1007/s40964-018-0044-4}},
year = {{2018}},
}
@inproceedings{45745,
author = {{Steinhoff, Lena and Zondag, M.}},
booktitle = {{2018 AMA Winter Academic Conference Proceedings, New Orleans}},
location = {{New Orleans}},
title = {{{Enhancing Loyalty Program Effectiveness by Engaging Members along the Customer Journey}}},
year = {{2018}},
}
@inproceedings{45744,
author = {{Eggert, Andreas and Steinhoff, Lena and Witte, Carina}},
booktitle = {{2018 AMA Winter Academic Conference Proceedings, New Orleans}},
location = {{New Orleans}},
title = {{{Are Gift Purchases an Effective Driver of Customer Loyalty?}}},
year = {{2018}},
}
@article{26043,
author = {{Stefszky, Michael and Ulvila, Ville and Abdallah, Zeina and Silberhorn, Christine and Vainio, Markku}},
issn = {{2469-9926}},
journal = {{Physical Review A}},
title = {{{Towards optical-frequency-comb generation in continuous-wave-pumped titanium-indiffused lithium-niobate waveguide resonators}}},
doi = {{10.1103/physreva.98.053850}},
year = {{2018}},
}
@article{63740,
author = {{Wright, Thomas A. and Francis-Jones, Robert J. A. and Gawith, Corin B. E. and Becker, Jonas N. and Ledingham, Patrick M. and Smith, Peter G. R. and Nunn, Joshua and Mosley, Peter J. and Brecht, Benjamin and Walmsley, Ian A.}},
issn = {{2331-7019}},
journal = {{Physical Review Applied}},
number = {{4}},
publisher = {{American Physical Society (APS)}},
title = {{{Two-Way Photonic Interface for Linking the Sr+ Transition at 422 nm to the Telecommunication C Band}}},
doi = {{10.1103/physrevapplied.10.044012}},
volume = {{10}},
year = {{2018}},
}
@article{63739,
author = {{Kaczmarek, K. T. and Ledingham, P. M. and Brecht, Benjamin and Thomas, S. E. and Thekkadath, G. S. and Lazo-Arjona, O. and Munns, J. H. D. and Poem, E. and Feizpour, A. and Saunders, D. J. and Nunn, J. and Walmsley, I. A.}},
issn = {{2469-9926}},
journal = {{Physical Review A}},
number = {{4}},
publisher = {{American Physical Society (APS)}},
title = {{{High-speed noise-free optical quantum memory}}},
doi = {{10.1103/physreva.97.042316}},
volume = {{97}},
year = {{2018}},
}
@misc{63902,
author = {{Markewitz, Friedrich}},
booktitle = {{Zeitschrift für Angewandte Linguistik}},
number = {{1}},
pages = {{173--180}},
title = {{{Langrezension zu Albert Greules und Sandra Reimanns 'Basiswissen Textgrammatik'}}},
volume = {{68}},
year = {{2018}},
}
@inbook{44776,
author = {{Freitag, Christine and von Bargen, Imke}},
booktitle = {{Migration, Geschlecht und Religion. Praktiken der Differenzierung}},
editor = {{Breitenbach, Eva and Rieske, Thomas Viola and Toppe, Sabine}},
isbn = {{978-3-8474-2159-7}},
pages = {{49--60}},
publisher = {{Verlag Barbara Budrich}},
title = {{{Bilder von Männlichkeit und Weiblichkeit im Kontext religionsbezogener Wahrnehmung: Zuschreibungen aus der Sicht von Lehrkräften}}},
year = {{2018}},
}
@misc{51045,
author = {{Muller, Jil}},
booktitle = {{Rivista di storia della filosofia}},
issn = {{0393-2516}},
number = {{4}},
pages = {{673--676}},
publisher = {{ Franco Angeli}},
title = {{{Women and early modern Philosophy and Science}}},
doi = {{10.3280/SF2018-004006}},
volume = {{73}},
year = {{2018}},
}
@article{64054,
abstract = {{In this work, the preparation of porous hybrid particle-based films by core-shell particle design and convenient film preparation is reported. Monodisperse core particles consisting of poly(methyl methacrylate‑co‑allyl methacrylate) (P(MMA‑co‑ALMA)) were synthesized by starved-feed emulsion polymerization followed by the introduction of an initiator-containing monomer (inimer) for subsequent atom transfer radical polymerization (ATRP). The inimer shell allowed for the introduction of allylhydrido polycarbosilane (SMP-10) under ATRP conditions by grafting to the core particles. The functionalization of the prepared core-shell particles was investigated by IR spectroscopy (FTIR), scanning transmission electron microscopy (STEM) and solid-state NMR combined with dynamic nuclear polarization (DNP). The obtained hard core/soft preceramic shell particles were subjected to the melt-shear organization technique, enabling a convenient alignment into a colloidal crystal structure in one single step without the presence of a dispersion medium or solvent for the designed particles. Moreover, the hybrid particle-based films were converted into a porous ceramic structure upon thermal treatment. As a result, freestanding ceramic porous films have been obtained after degradation of the organic template core particles. Noteworthy, the conversion of the matrix material consisting of SMP-10 into the ceramic occurred with preservation of the pristine colloidal crystal template structure. Herein, the first example of core-shell particle preparation by combining different polymerization methodologies and application of the convenient melt-shear organization technique is shown, paving a new way to ceramic materials with tailored morphology and porosity.}},
author = {{Vowinkel, Steffen and Boehm, Anna and Schäfer, Timmy and Gutmann, Torsten and Ionescu, Emanuel and Gallei, Markus}},
journal = {{Materials & Design}},
keywords = {{emulsion polymerization, self-assembly, ATRP, Colloidal crystal, Hybrid film, Particle processing}},
pages = {{926–935}},
title = {{{Preceramic core-shell particles for the preparation of hybrid colloidal crystal films by melt-shear organization and conversion into porous ceramics}}},
doi = {{10.1016/j.matdes.2018.10.032}},
volume = {{160}},
year = {{2018}},
}
@article{64031,
abstract = {{The activation of C-H bonds of alkanes remains a major challenge for chemistry. In a series of deuteration experiments with D-2 in contact with bis-(diphenylphosphino) butane (dppb) stabilized ruthenium nanoparticles (liquid substrates, 60 degrees C, 6 bar D-2) we have observed a surprisingly large reactivity of cyclopentane as compared to cyclohexane and other alkanes. DFT calculations using a ligand-free Ru13H17 model cluster as catalyst indicate oxidative C-H cleavage of the bound substrates as rate limiting reaction step. They also indicate similar binding and activation enthalpies of reactions of cyclopentane and cyclohexane.}},
author = {{Rothermel, N. and Bouzouita, D. and Rother, T. and Rosal, I. and Tricard, S. and Poteau, R. and Gutmann, Torsten and Chaudret, B. and Limbach, H. H. and Buntkowsky, G.}},
journal = {{ChemCatChem}},
number = {{19}},
pages = {{4243–4247}},
title = {{{Surprising Differences of Alkane C-H Activation Catalyzed by Ruthenium Nanoparticles: Complex Surface-Substrate Recognition?}}},
doi = {{10.1002/cctc.201801022}},
volume = {{10}},
year = {{2018}},
}
@article{64007,
abstract = {{The equilibration of H2, HD and D2 between the gas phase and surface hydrides of solid organic-ligand-stabilized Ru metal nanoparticles has been studied by gas phase 1H NMR spectroscopy using closed NMR tubes as batch reactors at room temperature and 800 mbar. When two different nanoparticle systems, Ru/PVP (PVP [identical with] polyvinylpyrrolidone) and Ru/HDA (HDA [identical with] hexadecylamine) were exposed to D2 gas, only the release of HD from the hydride containing surface could be detected in the initial stages of the reaction, but no H2. In the case of Ru/HDA also the reverse experiment was performed where surface deuterated nanoparticles were exposed to H2. In that case, the conversion of H2 into gaseous HD was detected. In order to analyze the experimental kinetic and spectroscopic data, we explored two different mechanisms taking into account potential kinetic and equilibrium H/D isotope effects. Firstly, we explored the dissociative exchange mechanism consisting of dissociative adsorption of dihydrogen, fast hydride surface diffusion and associative desorption of dihydrogen. It is shown that if D2 is the reaction partner, only H2 will be released in the beginning of the reaction, and HD only in later reaction stages. The second mechanism, dubbed here associative exchange consists of the binding of dihydrogen to Ru surface atoms, followed by a H-transfer to or by H-exchange with an adjacent hydride site, and finally of the associative desorption of dihydrogen. In that case, in the exchange with D2, only HD will be released in the beginning of the reaction. Our experimental results are not compatible with the dissociative exchange but can be explained in terms of the associative exchange. Whereas the former will dominate at low temperatures and pressures, the latter will prevail around room temperature and normal pressures where transition metal nanoparticles are generally used as reaction catalysts.}},
author = {{Limbach, Hans-Heinrich and Pery, Tal and Rothermel, Niels and Chaudret, Bruno and Gutmann, Torsten and Buntkowsky, Gerd}},
journal = {{Physical Chemistry Chemical Physics}},
number = {{16}},
pages = {{10697–10712}},
publisher = {{The Royal Society of Chemistry}},
title = {{{Gas phase 1H NMR studies and kinetic modeling of dihydrogen isotope equilibration catalyzed by Ru-nanoparticles under normal conditions: dissociative vs. associative exchange}}},
doi = {{10.1039/C7CP07770J}},
volume = {{20}},
year = {{2018}},
}
@article{64010,
abstract = {{Seven novel dirhodium coordination polymers (Rh-2-Ln) (n = 1-7) are prepared by employing bitopic ligands to connect dirhodium nodes. The formation of the framework is confirmed by attenuated total reflectance Fourier transform infrared (ATR-FTIR) and H-1 C-13 cross polarization magic angle spinning nuclear magnetic resonance (CP MAS NMR) spectroscopy. Defect sites resulting from incomplete ligand substitution are revealed by F-19 MAS NMR. The random stacking behavior of the frameworks in the obtained solid is analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The Rh-2/O interaction in neighboring layers is investigated by diffuse reflectance ultra-violet visible light (DR-UV-vis) spectroscopy and X-ray photoelectron spectroscopy (XPS). This interaction is relevant to understand the catalytic behavior of various Rh-2-Ln catalysts in the cyclopropanation of styrene with ethyl diazoacetate (EDA). In this context, the structure-reactivity relationship is discussed by taking into consideration both interlayer Rh-2/O interactions and steric effects of side chains.}},
author = {{Liu, J. Q. and Xu, Y. P. and Groszewicz, P. B. and Brodrecht, M. and Fasel, C. and Hofmann, K. and Tan, X. J. and Gutmann, Torsten and Buntkowsky, G.}},
issn = {{2044-4753}},
journal = {{Catalysis Science & Technology}},
keywords = {{Chemistry, asymmetric cyclopropanation, c-h insertion, carbene transformations, carboxylates, catalysts, functionalization, immobilization, metal-organic frameworks, nmr, solid support}},
number = {{20}},
pages = {{5190–5200}},
title = {{{Novel dirhodium coordination polymers: the impact of side chains on cyclopropanation}}},
doi = {{10.1039/c8cy01493k}},
volume = {{8}},
year = {{2018}},
}
@article{64014,
abstract = {{Many efforts have been made to isolate native nanocrystals from raw materials in the last two decades, such as cellulose nanocrystals (CNCs), but existing methods still suffer from low yields, complicated synthesis processes, and nonuniform sizes of obtained CNCs. This study concerns a facile, self-terminating, and efficient method for the formation of uniform CNCs in high yields during the periodate oxidation process within Pickering emulsions. A biphasic system containing hexane with dissolved hexylamine and an aqueous solution of sodium periodate (NaIO4) was used as the reaction medium. Regulated by hexylamine, owing to its limited solubility in water, the pH value of the aqueous phase was enhanced to around 9.8, leading to the precipitation of sodium orthoperiodate (Na2H3IO6) nanoplates and thus the formation of the initial Pickering emulsions. During the gradual formation of cellulose nanofibers and then CNCs, CNCs were attracted to stabilize the interface of the Pickering emulsions, which prevented further decomposition of CNCs by the oxidizing agent in aqueous suspensions. Thus, this isolation strategy secured the efficient separation of CNCs based on their own particular amphiphilic properties and achieved a high yield of up to 56 wt%.}},
author = {{Liu, P. W. and Pang, B. and Tian, L. and Schafer, T. and Gutmann, Torsten and Liu, H. and Volkert, C. A. and Buntkowsky, G. and Zhang, K.}},
journal = {{ChemSusChem}},
number = {{20}},
pages = {{3581–3585}},
title = {{{Efficient, Self-Terminating Isolation of Cellulose Nanocrystals through Periodate Oxidation in Pickering Emulsions}}},
doi = {{10.1002/cssc.201801678}},
volume = {{11}},
year = {{2018}},
}
@article{64000,
abstract = {{Surface enhanced solid-state NMR by dynamic nuclear polarization (DNP SENS) enables the characterization of the inner-pore surface functionalization of porous etched ion-track membranes exhibiting low specific surface areas compared to typical SBA- or MCM-type mesoporous silica materials. The membranes were conformally coated with a 5 nm thin SiO2 layer by atomic layer deposition. This layer was subsequently modified by aminopropyl silane linkers that allow further functionalization via the terminal amine group. The results evidence that in principle DNP SENS is a capable tool to analyze more complex porous systems, e.g. bioinspired functional etched ion-track membranes down to the molecular level. These results are relevant also for single nanopore systems, for which a direct analysis of the channel surface functionalization is not feasible by classical characterization methods. The applicability of DNP SENS to complex porous systems requires the optimization of the sample preparation and measurement parameters.}},
author = {{Kumari, B. and John, D. and Hoffmann, P. and Spende, A. and Toimil-Molares, M. E. and Trautmann, C. and Hess, C. and Ruff, P. and Schulze, M. and Stark, R. and Buntkowsky, G. and Andrieu-Brunsen, A. and Gutmann, Torsten}},
issn = {{0942-9352}},
journal = {{Zeitschrift Fur Physikalische Chemie-International Journal of Research in Physical Chemistry & Chemical Physics}},
number = {{7-8}},
pages = {{1173–1186}},
title = {{{Surface Enhanced DNP Assisted Solid-State NMR of Functionatized SiO2 Coated Potycarbonate Membranes}}},
doi = {{10.1515/zpch-2017-1032}},
volume = {{232}},
year = {{2018}},
}
@article{63999,
abstract = {{The behavior of mixtures of 1-octanol with water with different molar ratios confined inside the mesoporous silica SBA-15 was investigated by a combination of solid-state NMR spectroscopy and molecular dynamics (MD) simulations. Two-dimensional H-1-Si-29 FSLG-HET-COR NMR spectra revealed the orientation of 1-octanol relative to the pore walls. These arrangements are in good agreement with the preferred structures found by MD. In addition, MD simulations also shed light on molecular orientations and interactions in the pore center region, which are not resolvable by solid-state NMR.}},
author = {{Kumari, B. and Brodrecht, M. and Breitzke, H. and Werner, M. and Grunberg, B. and Limbach, H. H. and Forg, S. and Sanjon, E. P. and Drossel, B. and Gutmann, Torsten and Buntkowsky, G.}},
issn = {{1932-7447}},
journal = {{Journal of Physical Chemistry C}},
number = {{34}},
pages = {{19540–19550}},
title = {{{Mixtures of Alcohols and Water confined in Mesoporous Silica: A Combined Solid-State NMR and Molecular Dynamics Simulation Study}}},
doi = {{10.1021/acs.jpcc.8b04745}},
volume = {{122}},
year = {{2018}},
}
@article{63978,
abstract = {{The colligative property freezing point depression is evaluated as a means for estimating the extent of aggregation for solutions of poly(ethylene oxide) alcohol (C10E6) nonionic surfactant in cyclohexane. Combined with additional measurements of self-diffusion coefficients, it is shown that both unaggregated C10E6 as well as reverse micelles are significantly present for the entire range of measured C10E6 concentration (0.048−2.35 mol kg−1). A change in speciation near 0.2 mol kg−1 is indicated by the results from both freezing point depression and selfdiffusion coefficient measurements. It is shown that average reverse micelle radii and aggregation numbers obtained from the ratio of solvent and C10E6 self-diffusion coefficients are consistent with prior reported results. However, unreasonably small radii for the reverse micelles as well as for the cyclohexane were obtained from analysis of the results by the Stokes−Einstein equation using additional measured solution viscosities. The concentration of reverse micelles and unaggregated C10E6 was calculated from the freezing point depression results using the aggregation numbers obtained from ratio of self-diffusion coefficients. These concentrations indicate that the reverse micelles become smaller in average size and increase in number with increasing temperature without an increase in unaggregated C10E6.}},
author = {{Hoffmann, Markus M. and Bothe, Sarah and Gutmann, Torsten and Buntkowsky, Gerd}},
journal = {{Journal of Physical Chemistry B}},
number = {{18}},
pages = {{4913–4921}},
publisher = {{American Chemical Society}},
title = {{{Combining Freezing Point Depression and Self-Diffusion Data for Characterizing Aggregation}}},
doi = {{10.1021/acs.jpcb.8b03456}},
volume = {{122}},
year = {{2018}},
}
@article{63938,
author = {{Cao, Yuan and Zhao, Li and Gutmann, Torsten and Xu, Yeping and Dong, Lin and Buntkowsky, Gerd and Gao, Fei}},
issn = {{1932-7447}},
journal = {{Journal of Physical Chemistry C}},
number = {{35}},
pages = {{20402–20409}},
publisher = {{American Chemical Society}},
title = {{{Getting Insights into the Influence of Crystal Plane Effect of Shaped Ceria on Its Catalytic Performances}}},
doi = {{10.1021/acs.jpcc.8b06138}},
volume = {{122}},
year = {{2018}},
}
@article{63940,
author = {{Dagys, Laurynas and Klimavicius, Vytautas and Gutmann, Torsten and Buntkowsky, Gerd and Balevicius, Vytautas}},
journal = {{Journal of Physical Chemistry A}},
number = {{45}},
pages = {{8938–8947}},
publisher = {{American Chemical Society}},
title = {{{Quasi-Equilibria and Polarization Transfer Between Adjacent and Remote Spins: 1H–13C CP MAS Kinetics in Glycine}}},
doi = {{10.1021/acs.jpca.8b09036}},
volume = {{122}},
year = {{2018}},
}
@article{63926,
abstract = {{Synthesis of novel trityl-nitroxyl biradicals and their performance as polarization agents in DNP-enhanced solid-state MAS NMR spectroscopy is presented. Signal enhancements in H-1, H-1 -{\textgreater} C-13 CP MAS, and C-13 MAS experiments obtained with these radicals dissolved in 1,1,2,2-tetrachloroethane (TCE) solution are compared with the enhancements obtained from TCE solutions of binitroxyl radicals. The signal enhancements are correlated with the distance between the radical centers of the biradicals, as determined by theoretical structure calculations. Some of the biradical TCE solutions display direct-channel resonances in C-13 MAS experiments as well as indirect channel resonances induced via the proton spin reservoir. Differential scanning calorimetry reveals that only these solutions do not form any solid crystalline phases upon rapid cooling, suggesting that molecular motions needed for polarization transfer from radicals to C-13 via the proton spin reservoir remain active at the experimental low temperatures of nominal 120 K. DNP magnetic field sweep enhancement profiles for selected new biradicals are presented as well. These indicate that the DNP transfer is dominated by the cross-effect mechanism.}},
author = {{Bothe, S. and Nowag, J. and Klimavicius, V. and Hoffmann, M. and Troitskaya, T. I. and Amosov, E. V. and Tormyshev, V. M. and Kirilyuk, I. and Taratayko, A. and Kuzhelev, A. and Parkhomenko, D. and Bagryanskaya, E. and Gutmann, Torsten and Buntkowsky, G.}},
issn = {{1932-7447}},
journal = {{Journal of Physical Chemistry C}},
number = {{21}},
pages = {{11422–11432}},
title = {{{Novel Biradicals for Direct Excitation Highfield Dynamic Nuclear Polarization}}},
doi = {{10.1021/acs.jpcc.8b02570}},
volume = {{122}},
year = {{2018}},
}