@book{64156, author = {{Gutmann, Torsten and Buntkowsky, Gerd and Webb, Graham}}, isbn = {{978-3-319-28275-6}}, publisher = {{Springer International Publishing}}, title = {{{Modern Magnetic Resonance}}}, year = {{2017}}, } @article{64053, abstract = {{The utilization and preparation of functional hybrid films for optical sensing applications and membranes is of utmost importance. In this work, we report the convenient and scalable preparation of self-crosslinking particle-based films derived by directed self-assembly of alkoxysilane-based cross-linkers as part of a core-shell particle architecture. The synthesis of well-designed monodisperse core-shell particles by emulsion polymerization is the basic prerequisite for subsequent particle processing via the melt-shear organization technique. In more detail, the core particles consist of polystyrene (PS) or poly(methyl methacrylate) (PMMA), while the comparably soft particle shell consists of poly(ethyl acrylate) (PEA) and different alkoxysilane-based poly(methacrylate)s. For hybrid film formation and convenient self-cross-linking, different alkyl groups at the siloxane moieties were investigated in detail by solid-state Magic-Angle Spinning Nuclear Magnetic Resonance (MAS, NMR) spectroscopy revealing different crosslinking capabilities, which strongly influence the properties of the core or shell particle films with respect to transparency and iridescent reflection colors. Furthermore, solid-state NMR spectroscopy and investigation of the thermal properties by differential scanning calorimetry (DSC) measurements allow for insights into the cross-linking capabilities prior to and after synthesis, as well as after the thermally and pressure-induced processing steps. Subsequently, free-standing and self-crosslinked particle-based films featuring excellent particle order are obtained by application of the melt-shear organization technique, as shown by microscopy (TEM, SEM).}}, author = {{Vowinkel, S. and Paul, S. and Gutmann, Torsten and Gallei, M.}}, issn = {{2079-4991}}, journal = {{Nanomaterials}}, keywords = {{Materials Science, Science & Technology - Other Topics, solid-state nmr, spectroscopy, catalysts, colloidal crystals, colloids, cross-linking, elastomeric opal films, emulsion polymerization, gamma-methacryloxypropyltrimethoxysilane, hybrid films, melt-shear organization, nanoparticles, particle, photons, polymers, processing, self-assembly, transition}}, number = {{11}}, pages = {{390}}, title = {{{Free-Standing and Self-Crosslinkable Hybrid Films by Core-Shell Particle Design and Processing}}}, doi = {{10.3390/nano7110390}}, volume = {{7}}, year = {{2017}}, } @article{64057, abstract = {{Self-assembly of nanoparticles (NPs) forming unique structures has been investigated extensively over the past few years. However, many self-assembled structures by NPs are irreversible, because they are generally constructed using their suspensions. It is still challenging for NPs to reversibly self-assemble in dry state, let alone of polymeric NPs with general sizes of hundreds of nm. Herein, this study reports a new reversible self-assembly phenomenon of NPs in dry state, forming thermoreversible strip-like supermolecular structures. These novel NPs of around 150 nm are perfluorinated surface-undecenoated cellulose nanoparticles (FSU-CNPs) with a core-coronas structure. The thermoreversible self-assembled structure is formed after drying in the air at the interface between FSU-CNP films and Teflon substrates. Remarkably, the formation and dissociation of this assembled structure are accompanied by a reversible conversion of the surface hydrophobicity, film transparency, and anisotropic properties. These findings show novel feasibility of reversible self-assembly of NPs in dry state, and thereby expand our knowledge of self-assembly phenomenon.}}, author = {{Wang, Yonggui and Groszewicz, Pedro B. and Rosenfeldt, Sabine and Schmidt, Hendrik and Volkert, Cynthia A. and Vana, Philipp and Gutmann, Torsten and Buntkowsky, Gerd and Zhang, Kai}}, journal = {{Advanced Materials}}, keywords = {{nanoparticles, self-assembly, cellulose, core-coronas structure, thermoreversible}}, pages = {{1702473}}, title = {{{Thermoreversible Self-Assembly of Perfluorinated Core-Coronas Cellulose-Nanoparticles in Dry State}}}, doi = {{10.1002/adma.201702473}}, year = {{2017}}, } @article{64048, author = {{Thankamony, Aany S. L. and Knoche, Stefan and Bothe, Sarah and Drochner, Alfons and Jagtap, Anil P. and Sigurdsson, Snorri Th and Vogel, Herbert and Etzold, Bastian J. M. and Gutmann, Torsten and Buntkowsky, Gerd}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, number = {{38}}, pages = {{20857–20864}}, publisher = {{American Chemical Society}}, title = {{{Characterization of V–Mo–W Mixed Oxide Catalyst Surface Species by 51V Solid-State Dynamic Nuclear Polarization NMR}}}, doi = {{10.1021/acs.jpcc.7b06761}}, volume = {{121}}, year = {{2017}}, } @article{64012, author = {{Liu, Jiquan and Groszewicz, Pedro B. and Wen, Qingbo and Thankamony, Aany Sofia Lilly and Zhang, Bin and Kunz, Ulrike and Sauer, Grit and Xu, Yeping and Gutmann, Torsten and Buntkowsky, Gerd}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, number = {{32}}, pages = {{17409–17416}}, publisher = {{American Chemical Society}}, title = {{{Revealing Structure Reactivity Relationships in Heterogenized Dirhodium Catalysts by Solid-State NMR Techniques}}}, doi = {{10.1021/acs.jpcc.7b06807}}, volume = {{121}}, year = {{2017}}, } @article{63979, author = {{Hoffmann, Markus M. and Bothe, Sarah and Gutmann, Torsten and Hartmann, Frank-Frederik and Reggelin, Michael and Buntkowsky, Gerd}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, number = {{4}}, pages = {{2418–2427}}, publisher = {{American Chemical Society}}, title = {{{Directly vs Indirectly Enhanced 13C in Dynamic Nuclear Polarization Magic Angle Spinning NMR Experiments of Nonionic Surfactant Systems}}}, doi = {{10.1021/acs.jpcc.6b13087}}, volume = {{121}}, year = {{2017}}, } @article{63977, author = {{Hoffmann, Markus M. and Bothe, Sarah and Gutmann, Torsten and Buntkowsky, Gerd}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, number = {{41}}, pages = {{22948–22957}}, publisher = {{American Chemical Society}}, title = {{{Unusual Local Molecular Motions in the Solid State Detected by Dynamic Nuclear Polarization Enhanced NMR Spectroscopy}}}, doi = {{10.1021/acs.jpcc.7b07965}}, volume = {{121}}, year = {{2017}}, } @article{63962, author = {{Gutmann, Torsten and Kumari, Bharti and Zhao, Li and Breitzke, Hergen and Schöttner, Sebastian and Rüttiger, Christian and Gallei, Markus}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, number = {{7}}, pages = {{3896–3903}}, publisher = {{American Chemical Society}}, title = {{{Dynamic Nuclear Polarization Signal Amplification as a Sensitive Probe for Specific Functionalization of Complex Paper Substrates}}}, doi = {{10.1021/acs.jpcc.6b11751}}, volume = {{121}}, year = {{2017}}, } @article{63956, abstract = {{The synthesis of novel robust and stable iridium-based immobilized catalysts on silica-polymer hybrid materials (Si-PB-Ir) is described. These catalysts are characterized by a combination of 1D P-31 CP-MAS and 2D P-31-H-1 HETCOR and J-resolved multinuclear solid state NMR experiments. Different binding situations such as singly and multiply coordinated phosphines are identified. Density functional theory (DFT) calculations are performed to corroborate the interpretation of the experimental NMR data, in order to propose a structural model of the heterogenized catalysts. Finally, the catalytic activity of the Si-PB-Ir catalysts is investigated for the hydrogenation of styrene employing para-enriched hydrogen gas.}}, author = {{Gutmann, Torsten and Alkhagani, S. and Rothermel, N. and Limbach, H. H. and Breitzke, H. and Buntkowsky, G.}}, issn = {{0942-9352}}, journal = {{Zeitschrift Fur Physikalische Chemie-International Journal of Research in Physical Chemistry & Chemical Physics}}, keywords = {{Chemistry, dynamic nuclear-polarization, solid-state nmr, DFT, heterogeneous catalysis, hydrido complexes, hydrogenation, immobilized catalyst, inorganic hybrid, iridium, materials, mesoporous, molecular-orbital methods, PHIP, phosphine complexes, reusable catalysts, silica, solid-state-NMR, wilkinsons catalyst}}, number = {{3}}, pages = {{653–669}}, title = {{{P-31-Solid-State NMR Characterization and Catalytic Hydrogenation Tests of Novel heterogenized Iridium-Catalysts}}}, doi = {{10.1515/zpch-2016-0837}}, volume = {{231}}, year = {{2017}}, } @inbook{63958, author = {{Gutmann, Torsten and Buntkowsky, Gerd}}, booktitle = {{Modern Magnetic Resonance. Solid-state NMR Studies of Supported Transition Metal Catalysts and Nanoparticles}}, editor = {{Webb, Graham A.}}, isbn = {{978-3-319-28275-6}}, pages = {{1–21}}, publisher = {{Springer International Publishing}}, title = {{{Solid-state NMR Studies of Supported Transition Metal Catalysts and Nanoparticles}}}, doi = {{10.1007/978-3-319-28275-6_39-1}}, year = {{2017}}, } @article{63949, abstract = {{In paper-based devices, capillary fluid flow is based on length-scale selective functional control within a hierarchical porous system. The fluid flow can be tuned by altering the paper preparation process, which controls parameters such as the paper grammage. Interestingly, the fiber morphology and nanoporosity are often neglected. In this work, porous voids are incorporated into paper by the combination of dense or mesoporous ceramic silica coatings with hierarchically porous cotton linter paper. Varying the silica coating leads to significant changes in the fluid flow characteristics, up to the complete water exclusion without any further fiber surface hydrophobization, providing new approaches to control fluid flow. Additionally, functionalization with redox-responsive polymers leads to reversible, dynamic gating of fluid flow in these hybrid paper materials, demonstrating the potential of length scale specific, dynamic, and external transport control.}}, author = {{Dubois, C. and Herzog, N. and Ruettiger, C. and Geissler, A. and Grange, E. and Kunz, U. and Kleebe, H. J. and Biesalski, M. and Meckel, T. and Gutmann, Torsten and Gallei, M. and Andrieu-Brunsen, A.}}, issn = {{0743-7463}}, journal = {{Langmuir}}, number = {{1}}, pages = {{332–339}}, title = {{{Fluid Flow Programming in Paper-Derived Silica-Polymer Hybrids}}}, doi = {{10.1021/acs.langmuir.6b03839}}, volume = {{33}}, year = {{2017}}, } @article{63927, abstract = {{A detailed study of the magnetic field dependent signal enhancement in solid-state dynamic nuclear polarization (DNP) experiments is presented for a specific sample consisting of AMUPol dissolved in the nonionic surfactant C10E6. C10E6 displays a superposition of “direct” and “indirect channel” resonances in 13C MAS DNP NMR spectra. The shapes of the DNP enhancement profiles are essentially identical for the 1H MAS, 1H → 13C CP MAS, and 13C MAS indirect channel signals, which confirms that the same polarization transfer process from electron to proton is responsible for the obtained enhancements of these experiments. The shape of the DNP enhancement profiles of 1H and of 13C direct channel resonances reveals that the cross effect is the dominant polarization transfer mechanism for the studied sample. The magnitudes of the 13C MAS DNP enhancement profiles for 1H → 13C CP MAS, direct and indirect channel signals were found to be not uniform. For 1H → 13C CP MAS and the indirect channel signals, this observation is related to relaxation effects of the methyl group carbon. For the 13C MAS direct channel resonances, differences in magnitudes are discussed in terms of preferential structural orientation of the polar ethylene oxide headgroup of C10E6 toward the AMUPol radical.}}, author = {{Bothe, Sarah and Hoffmann, Markus M. and Gutmann, Torsten and Buntkowsky, Gerd}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, number = {{48}}, pages = {{27089–27097}}, publisher = {{American Chemical Society}}, title = {{{Comparative Study of the Magnetic Field Dependent Signal Enhancement in Solid-State Dynamic Nuclear Polarization Experiments}}}, doi = {{10.1021/acs.jpcc.7b07967}}, volume = {{121}}, year = {{2017}}, } @article{63920, abstract = {{Coordinatively unsaturated sites (CUS) present a key feature of alumina based catalysts as they are believed to act as Lewis-acid sites in heterogeneously catalyzed reactions. In the present study, the direct observation of active species on a fluoride-doped aluminum oxide catalyst is demonstrated. This new fluoride-doped aluminum oxide exhibits strong Lewis-acid sites and superior catalytic activity as compared to gamma-Al2O3. To emphasize the labile state of Lewis-acid sites, two distinctive states of the catalysts surface are addressed using H-1-Al-27 cross polarization (CP) MAS NMR. On the one hand, the highly dehydrated and active state after calcination at 700 degrees C and on the other hand the rehydrated and catalytically inactive surface (produced by contact to air) are probed. These experiments revealed the presence of significant amounts of coordinatively unsaturated sites in the form of 4-and 5-fold coordinated Al-sites on the highly dehydrated surface. In contrast to this, the rehydrated sample exhibited a severely restructured surface caused by the chemisorption of H2O which is ’constituted in a manner that was proposed in earlier models for gamma-Al2O3 surfaces.}}, author = {{Ahrem, L. and Scholz, G. and Gutmann, Torsten and Calvo, B. and Buntkowsky, G. and Kemnitz, E.}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, keywords = {{al-27 nmr, characterization, Chemistry, cross-polarization, dynamic nuclear-polarization, eta-alumina, gamma-alumina, hydroxy fluorides, ions, Materials Science, pentacoordinated al3+, Science & Technology - Other Topics, solid-state nmr, spectroscopic, structural insights}}, number = {{22}}, pages = {{12206–12213}}, title = {{{Direct Observation of Coordinatively Unsaturated Sites on the Surface of a Fluoride-Doped Alumina Catalyst}}}, doi = {{10.1021/acs.jpcc.7b02535}}, volume = {{121}}, year = {{2017}}, } @article{64279, abstract = {{

For reductive symmetric spaces G / H G/H of split rank one we identify a class of minimal parabolic subgroups for which certain cuspidal integrals of Harish-Chandra–Schwartz functions are absolutely convergent. Using these integrals we introduce a notion of cusp forms and investigate its relation with representations of the discrete series for G / H G/H .

}}, author = {{van den Ban, Erik and Kuit, Job}}, issn = {{1088-4165}}, journal = {{Representation Theory of the American Mathematical Society}}, number = {{17}}, pages = {{467--533}}, publisher = {{American Mathematical Society (AMS)}}, title = {{{Cusp forms for reductive symmetric spaces of split rank one}}}, doi = {{10.1090/ert/507}}, volume = {{21}}, year = {{2017}}, } @article{64282, author = {{van den Ban, Erik P. and Kuit, Job J.}}, issn = {{0022-1236}}, journal = {{Journal of Functional Analysis}}, number = {{7}}, pages = {{2795--2864}}, publisher = {{Elsevier BV}}, title = {{{Normalizations of Eisenstein integrals for reductive symmetric spaces}}}, doi = {{10.1016/j.jfa.2017.01.004}}, volume = {{272}}, year = {{2017}}, } @techreport{20555, author = {{Krüger, Stefan and Späth, Johannes and Ali, Karim and Bodden, Eric and Mezini, Mira}}, keywords = {{ITSECWEBSITE}}, title = {{{CrySL: Validating Correct Usage of Cryptographic APIs}}}, year = {{2017}}, } @article{27402, author = {{Abdelgawad, Kareem and Gausemeier, Jürgen and Trächtler, Ansgar and Gausemeier, Sandra and Dumitrescu, Roman and Berssenbrügge, Jan and Stöcklein, Jörg and Grafe, Michael}}, journal = {{Designs ‒ International Journal of Engineering Designs, Band 1}}, number = {{1}}, pages = {{6.1--6.47}}, publisher = {{MDPI AG}}, title = {{{An Application-Oriented Design Method for Networked Driving Simulation}}}, doi = {{10.3390/designs1010006}}, volume = {{1}}, year = {{2017}}, } @article{27406, author = {{Abdelgawad, Kareem and Gausemeier, Jürgen and Dumitrescu, Roman and Grafe, Michael and Stöcklein, Jörg and Berssenbrügge, Jan}}, journal = {{Designs ‒ International Journal of Engineering Designs, Band 1 }}, number = {{1}}, pages = {{4.1--4.17}}, publisher = {{MDPI AG}}, title = {{{Networked Driving Simulation: Applications, State of the Art, and Design Considerations}}}, doi = {{10.3390/designs1010004}}, volume = {{1}}, year = {{2017}}, } @inproceedings{27398, author = {{Abdelgawad, Kareem and Gausemeier, Jürgen and Stöcklein, Jörg and Grafe, Michael and Berssenbrügge, Jan and Dumitrescu, Roman}}, booktitle = {{Designs ‒ International Journal of Engineering Designs}}, number = {{2}}, pages = {{8/1--8/14}}, publisher = {{MDPI AG}}, title = {{{A Platform with Multiple Head-Mounted Displays for Advanced Training in Modern Driving Schools}}}, doi = {{10.3390/designs1020008}}, volume = {{1}}, year = {{2017}}, } @inproceedings{64404, author = {{Lindemann, Markus and Gerhardt, Nils C. and Hofmann, Martin R. and Pusch, Tobias and Michalzik, Rainer}}, booktitle = {{2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC 2017)}}, pages = {{109}}, title = {{{Tunable polarization oscillations in resonantly pumped spin-VCSELs}}}, doi = {{10.1109/cleoe-eqec.2017.8086350}}, volume = {{1}}, year = {{2017}}, }