@article{41830, author = {{Stolzenburg, Pierre and Hämisch, Benjamin and Richter, Sebastian and Huber, Klaus and Garnweitner, Georg}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{43}}, pages = {{12834--12844}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Secondary Particle Formation during the Nonaqueous Synthesis of Metal Oxide Nanocrystals}}}, doi = {{10.1021/acs.langmuir.8b00020}}, volume = {{34}}, year = {{2018}}, } @article{6542, abstract = {{Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump–probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.}}, author = {{Ruppert, Claudia and Chernikov, Alexey and Hill, Heather M. and Rigosi, Albert F. and Heinz, Tony F.}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, keywords = {{Atomically thin 2D materials, carrier and phonon dynamics, ultrafast spectroscopy}}, number = {{2}}, pages = {{644--651}}, publisher = {{American Chemical Society (ACS)}}, title = {{{The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation}}}, doi = {{10.1021/acs.nanolett.6b03513}}, volume = {{17}}, year = {{2017}}, } @article{41836, author = {{Kley, M. and Kempter, A. and Boyko, V. and Huber, Klaus}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{24}}, pages = {{6071--6083}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Silica Polymerization from Supersaturated Dilute Aqueous Solutions in the Presence of Alkaline Earth Salts}}}, doi = {{10.1021/acs.langmuir.7b00887}}, volume = {{33}}, year = {{2017}}, } @article{41835, author = {{Büngeler, Anne and Hämisch, Benjamin and Huber, Klaus and Bremser, Wolfgang and Strube, Oliver I.}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{27}}, pages = {{6895--6901}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Insight into the Final Step of the Supramolecular Buildup of Eumelanin}}}, doi = {{10.1021/acs.langmuir.7b01634}}, volume = {{33}}, 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{4240, abstract = {{Cubic gallium nitride (GaN) films are analyzed with highresolution X-ray diffraction (HRXRD) and Raman spectroscopy. Several cubic GaN layers were grown on 3C-SiC (001) substrate by radio-frequency plasma-assisted molecular beam epitaxy. The layer thickness of the cubic GaN was varied between 75 and 505 nm. The HRXRD analysis reveals a reduction of the full-width at half-maximum (FWHM) of omega scans for growing layer thicknesses, which is caused by a partial compensation of defects. The Raman characterization confirms well-formed c-GaN layers. A more detailed examination of the longitudinal optical mode hints at a correlation of the FWHM of the Raman mode with the dislocation density, which shows the possibility to determine dislocation densities by Ramanspectroscopy on a micrometer scale, which is not possible by HRXRD. Furthermore, this Raman analysis shows that normalized Raman spectra present an alternative way to determine layer thicknesses of thin GaN films.}}, author = {{Rüsing, Michael and Wecker, T. and Berth, Gerhard and As, Donat Josef and Zrenner, Artur}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, keywords = {{cubic gallium nitride, dislocation density, HRXRD, Raman spectroscopy}}, number = {{4}}, pages = {{778--782}}, publisher = {{Wiley}}, title = {{{Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC}}}, doi = {{10.1002/pssb.201552592}}, volume = {{253}}, year = {{2016}}, } @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}}, } @article{63963, abstract = {{A novel heterogeneous dirhodium catalyst has been synthesized. This stable catalyst is constructed from dirhodium acetate dimer (Rh2(OAc)4) units, which are covalently linked to amine- and carboxyl-bifunctionalized mesoporous silica (SBA-15NH2COOH). It shows good efficiency in catalyzing the cyclopropanation reaction of styrene and ethyl diazoacetate (EDA) forming cis- and trans-1-ethoxycarbonyl-2-phenylcyclopropane. To characterize the structure of this catalyst and to confirm the successful immobilization, heteronuclear solid-state NMR experiments have been performed. The high application potential of dynamic nuclear polarization (DNP) NMR for the analysis of binding sites in this novel catalyst is demonstrated. Signal-enhanced 13C CP MAS and 15N CP MAS techniques have been employed to detect different carboxyl and amine binding sites in natural abundance on a fast time scale. The interpretation of the experimental chemical shift values for different binding sites has been corroborated by quantum chemical calculations on dirhodium model complexes.}}, author = {{Gutmann, Torsten and Liu, Jiquan and Rothermel, Niels and Xu, Yeping and Jaumann, Eva and Werner, Mayke and Breitzke, Hergen and Sigurdsson, Snorri T. and Buntkowsky, Gerd}}, journal = {{Chemistry A European Journal}}, keywords = {{heterogeneous catalysis, immobilized catalyst, dynamic nuclear polarization, hyperpolarization, NMR spectroscopy}}, number = {{9}}, pages = {{3798–3805}}, publisher = {{WILEY-VCH Verlag}}, title = {{{Natural Abundance 15N NMR by Dynamic Nuclear Polarization: Fast Analysis of Binding Sites of a Novel Amine-Carboxyl-Linked Immobilized Dirhodium Catalyst}}}, doi = {{10.1002/chem.201405043}}, volume = {{21}}, year = {{2015}}, } @article{40592, author = {{Lopez Salas, Nieves and Jardim, E. O. and Silvestre-Albero, A. and Gutiérrez, M. C. and Ferrer, M. L. and Rodríguez-Reinoso, F. and Silvestre-Albero, J. and del Monte, F.}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{41}}, pages = {{12220--12228}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Use of Eutectic Mixtures for Preparation of Monolithic Carbons with CO2-Adsorption and Gas-Separation Capabilities}}}, doi = {{10.1021/la5034146}}, volume = {{30}}, year = {{2014}}, } @article{41974, author = {{Kley, M. and Kempter, A. and Boyko, V. and Huber, Klaus}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{42}}, pages = {{12664--12674}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Mechanistic Studies of Silica Polymerization from Supersaturated Aqueous Solutions by Means of Time-Resolved Light Scattering}}}, doi = {{10.1021/la502730y}}, volume = {{30}}, year = {{2014}}, } @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{41985, author = {{Liu, J. and Pancera, S. and Boyko, V. and Gummel, J. and Nayuk, R. and Huber, Klaus}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{7}}, pages = {{3593--3605}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Impact of Sodium Polyacrylate on the Amorphous Calcium Carbonate Formation from Supersaturated Solution}}}, doi = {{10.1021/la203895d}}, volume = {{28}}, year = {{2012}}, } @article{4377, abstract = {{Confocal Raman spectroscopy was performed as an archetype imaging method to study the ferroelectric domain structure of periodically poled lithium niobate. More precisely, the linkage out of spatial resolution and spectral information proved itself as very useful. Here a specific modulation of the Raman lines by the local variation of polarity and a non-symmetric measuring-signal across the domain structure were found, which allows for imaging of domain boundaries as well as oppositely orientated domains. The high potential of this method is demonstrated by the visualization of the ferroelectric domain structures based on various phonon modes.}}, author = {{Berth, Gerhard and Hahn, Wjatscheslaw and Wiedemeier, Volker and Zrenner, Artur and Sanna, Simone and Schmidt, Wolf Gero}}, issn = {{0015-0193}}, journal = {{Ferroelectrics}}, keywords = {{Raman spectroscopy, ferroelectric domains, LiNbO3, confocal imaging}}, number = {{1}}, pages = {{44--48}}, publisher = {{Informa UK Limited}}, title = {{{Imaging of the Ferroelectric Domain Structures by Confocal Raman Spectroscopy}}}, doi = {{10.1080/00150193.2011.594774}}, volume = {{420}}, year = {{2011}}, } @article{35344, author = {{Bayer, Frank M. and Tang, Mingxue and Michels, Rolf and Schmidt, Claudia and Huber, Klaus}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{21}}, pages = {{12851--12858}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Molecular Recognition with 2,4-Diaminotriazine-Functionalized Colloids}}}, doi = {{10.1021/la202685e}}, volume = {{27}}, year = {{2011}}, } @article{29676, author = {{Helmstedt, Andreas and Sacher, Marc and Gryzia, Aaron and Harder, Alexander and Brechling, Armin and Müller, Norbert and Heinzmann, Ulrich and Hoeke, Veronika and Krickemeyer, Erich and Glaser, Thorsten and Bouvron, Samuel and Fonin, Mikhail}}, issn = {{0368-2048}}, journal = {{Journal of Electron Spectroscopy and Related Phenomena}}, keywords = {{Physical and Theoretical Chemistry, Spectroscopy, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Radiation, Electronic, Optical and Magnetic Materials}}, number = {{11-12}}, pages = {{583--588}}, publisher = {{Elsevier BV}}, title = {{{Exposure of [MnIII6CrIII]3+ single-molecule magnets to soft X-rays: The effect of the counterions on radiation stability}}}, doi = {{10.1016/j.elspec.2011.11.002}}, volume = {{184}}, year = {{2011}}, } @article{41988, author = {{Bayer, Frank M. and Tang, Mingxue and Michels, Rolf and Schmidt, Claudia and Huber, Klaus}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{21}}, pages = {{12851--12858}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Molecular Recognition with 2,4-Diaminotriazine-Functionalized Colloids}}}, doi = {{10.1021/la202685e}}, volume = {{27}}, year = {{2011}}, } @article{35348, author = {{Medronho, B. and Schmidt, Claudia and Olsson, U. and Miguel, M. G.}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{3}}, pages = {{1477--1481}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Size Determination of Shear-Induced Multilamellar Vesicles by Rheo-NMR Spectroscopy}}}, doi = {{10.1021/la903682p}}, volume = {{26}}, year = {{2010}}, } @article{35347, author = {{Medronho, B. and Rodrigues, M. and Miguel, M. G. and Olsson, U. and Schmidt, Claudia}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{13}}, pages = {{11304--11313}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Shear-Induced Defect Formation in a Nonionic Lamellar Phase}}}, doi = {{10.1021/la100627z}}, volume = {{26}}, year = {{2010}}, } @article{41992, author = {{Liu, J. and Pancera, S. and Boyko, V. and Shukla, A. and Narayanan, T. and Huber, Klaus}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{22}}, pages = {{17405--17412}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Evaluation of the Particle Growth of Amorphous Calcium Carbonate in Water by Means of the Porod Invariant from SAXS}}}, doi = {{10.1021/la101888c}}, volume = {{26}}, year = {{2010}}, } @article{41993, author = {{Bayer, Frank M. and Hiltrop, Karl and Huber, Klaus}}, issn = {{0743-7463}}, journal = {{Langmuir}}, keywords = {{Electrochemistry, Spectroscopy, Surfaces and Interfaces, Condensed Matter Physics, General Materials Science}}, number = {{17}}, pages = {{13815--13822}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Hydrogen-Bond-Induced Heteroassembly in Binary Colloidal Systems}}}, doi = {{10.1021/la101831x}}, volume = {{26}}, year = {{2010}}, }