Materials Literature
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Although early transition metals are too reactive to serve as effective combustion catalysts, it has been proposed that combining them with nonmetallic elements may moderate the reactivity and allow them to replace more expensive catalysts. To test this hypothesis, we use ZrO + as our replacement and compare the react…
Polyhydroxyalkanoates (PHAs) are a group of biopolymers resembling plastic due to their physical characteristics. PHAs are known to have great structural variety and biodegradability which add to their importance in replacing synthetic plastics and making them future green materials. Such biopolymers gained worldwide…
The conversion of dextran with in situ synthesized iminium chlorides of long chain carboxylic acids was used to obtain pure and defined melting dextran esters in an efficient one-pot synthesis. The melting point of these esters can be tailored by the degree of substitutions (DS), the molecular weight of the starting p…
Thermal depoling phenomena determine the upper temperature limit of the piezoelectric ceramics in application. In this paper, high-densified KNbO3 ceramics derived from single-crystalline nanostructures exhibited favorable piezoelectric constants d33, which varied from 105 to 80 pC/N over a broad temperature range fro…
We examine the jamming transition in a two-dimensional granular polymer system using compressional simulations. The jamming density Φ(c) decreases with increasing length of the granular chain due to the formation of loop structures, in excellent agreement with recent experiments. The jamming density can be further red…
The combined use of atomistic simulations and transition state theory (TST) has enabled significant improvements in the prediction of thermally activated processes in a wide range of applications, e.g., conformation changes in molecules, chemical reactions, kinetic phase transitions, and solid-state diffusion. However…
In this work we present results of an new experiment related to low energy protons bombardments on nano-structured optical coatings. Multilayer structures protected by different capping layers have been fabricated and exposed to low energy protons (1 keV). The experimental parameters have been selected considering the…
Multilayers of manganese(III) porphyrin-linked poly(vinylpyridinium) (MnTMPyP-PVPMe) polyelectrolyte and poly(styrenesulfonic acid-o-maleic) acid (PSS) have been assembled on gold, quartz, and indium tin oxide surfaces by a layer-by-layer (LBL) technique. The assembly process was monitored by measuring their absorptio…
Lichtspiele: Die meisten Sensibilisatoren für eine Aufkonversion durch Triplett-Triplett-Annihilierung (TTA) phosphoreszieren stark. Eine neue RuII-Cumarin-Diade verfügt zum einen über einen nichtemittierenden angeregten 3IL-Zustand (ΦP=0.2 %), zum anderen über eine gute Aufkonversions-Quantenausbeute (ΦUC=2.7 %; sieh…
Zellmodell: Der enzymvermittelte Aufbau eines supramolekularen Hydrogels auf Aminosäurebasis wird genutzt, um ein Vesikel-basiertes Protozellenmodell mit einem primitiven Cytoskelett-ähnlichen Inneren herzustellen. Die Vesikel zeigen temperaturabhängige Veränderungen der Morphologie (siehe Bild) und eine chemisch ange…
This study addresses the question of whether chemically deposited PbS thin films grown on GaAs(111) are affected by the oppositely terminated substrate surfaces, gallium terminated GaAs(111)A and arsenic terminated GaAs(111)B. The differences in PbS film deposition pathway in both cases of substrate surface terminatio…
This paper reports on the electric field control of magnetism without magnetic bias field in a Ni/Pb(Mg1/3Nb2/3)O3-PbTiO3/Ni composite prepared by electrochemical deposition. The converse magnetoelectric effect, which was measured by an induction method, shows a peak value of 0.45 G/V at the resonance frequency of 102…
We calculate the electronic structure and exchange interactions in a copper(II)phthalocyanine [Cu(II)Pc] crystal as a one-dimensional molecular chain using hybrid exchange density functional theory (DFT). In addition, the intermolecular exchange interactions are also calculated in a molecular dimer using Green's funct…
Abstract A mononuclear lanthanide–radical complex [Tb(hfac) 3 (NITPhSCH 3 ) 2 ] ( 1 ) and a one‐dimensional chain complex [Tb(hfac) 3 (NITPhSCH 3 )] n ( 2 ) {hfac = hexafluoroacetylacetonate, NITPhSCH 3 = 2‐[4‐(methylthio)phenyl]‐4,4,5,5‐tetramethylimidazolin‐1‐oxyl 3‐oxide} have been synthesized. Single‐crystal X‐ray…
Abstract We have investigated the predictive capability of a widely used group of density functional theory (DFT) methods on the interaction (hyper)polarizability of the two water molecules in the water dimer. We find that compared with conventional ab initio methods, DFT gives a different picture of the dipole moment…
Presented here are angle dependence studies on the surface enhanced Raman (SER) signal obtained from dye placed on plasmon active nanocavity arrays. A comparative study was carried out between two modified array supports. One array had dye placed only on the interior walls of the cavities in the array. The other array…
The phase change memory with monolayer chalcogenide film (Si18Sb52Te30) is investigated for the feasibility of multilevel data storage. During the annealing of the film, a relatively stable intermediate resistance can be obtained at an appropriate heating rate. The transmission electron microscopy in situ analysis rev…
We demonstrate that electron beam irradiation with precise dosage control under clean vacuum conditions can induce bond disorder and inter-valley scattering but not necessarily lattice damage in high quality single-layer graphene, as evidenced by the changes of temperature-dependent transport properties, quantum Hall…
We report a facile method to synthesize water-soluble gold nanoparticles (AuNPs) using a biosurfactant sodium cholate as reducing reagents and protective groups in aqueous solution at ambient temperature. The diameters (13-70 nm) of uniform AuNPs can be readily adjusted by changing the initial molar ratio of sodium ch…
Angle-resolved photoemission spectroscopy (ARPES) has generally been carried out at energies below \ensuremath{\sim}150 eV, but there is growing interest in going to higher energies so as to achieve greater bulk sensitivity. To this end, we have measured ARPES spectra from a tungsten (110) crystal in a plane containin…