Materials Literature
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Recent investigations have demonstrated that the short-time fluctuations in a supercooled liquid can be used as predictors of the long-time dynamic propensity (that is, the regions of the sample with enhanced tendency to be mobile within time scales on the order of the alpha -relaxation time). This could mean that the…
Abstract Several hierarchical nanophase‐separated structures have been observed for a series of ABC star‐shaped terpolymers by transmission electron microscopy (TEM) and electron computerized tomography (3D‐TEM). The seven terpolymers synthesized are composed of polyisoprene (I), polystyrene (S), and poly(2‐vinylpyrid…
The infrared spectra of the binary vanadium oxide cluster anions V(4)O(9)(-) and V(4)O(10)(-) and of the related methoxo clusters V(4)O(9)(OCH(3))(-) and V(4)O(8)(OCH(3))(2)(-) are recorded in the gas phase by photodissociation of the mass-selected ions using an infrared laser. For the oxide clusters V(4)O(9)(-) and V…
Abstract Numerical simulations of methane catalytic partial oxidation on Rh‐coated foam monoliths were performed and tested against high‐resolution species and temperature profiles measured along the catalyst axis. A systematic comparison considering 2D models with heat and mass transport and a 1D reactor model with t…
Abstract Inorganic–organic hybrid materials were prepared by free radical polymerization of styrene in the presence of varying amounts of the cluster Zr 6 O 4 (OH) 4 (methacrylate) 12 . Stepwise polymerization allowed the preparation of bubble‐ and crack‐free, transparent bulk samples on a 30 g scale with dimensions r…
The nanocomposites of polypropylene (PP) and nano-silicon nitride (chemical formula: Si 3 N 4 ) were prepared by a twin-screw extruder with isoactic PP granules, within which a proportion of PP granules were coated by nano-Si 3 N 4 modified with a silane coupling agent. The data of mechanical experiments showed that t…
The effect of laser excitation power density on the efficiency of intrinsic defect emission in ZnO powders was characterized by varying the laser irradiance over three orders of magnitude and monitoring changes in the samples’ photoluminescence. The external quantum efficiency of the visible wavelength, broadband defe…
Epoxy polyhedral oligomeric silsesquioxane (POSS)-based hybrid nanocomposites were prepared by in situ polymerization of a homogeneous blend of the diglycidylether of bisphenol-A and 4,4 ' diaminodiphenylmethane (DDM) in the presence of octa(maleimidophenyl)silsesquioxane. The reaction of a maleimido-functionalized PO…
Abstract Polymer composites composed of poly(methyl methacrylate) (PMMA) and silica (14 nm diameter) have been investigated. The influences of sample preparation and processing have been probed. Two types of sample preparation methods were investigated: (i) solution mixture of PMMA and silica in methyl ethyl ketone an…
We study the effects of short-range-correlated disorder arising from chemical dopants or local lattice distortions on the ferromagnetism of $3d$ double exchange systems. For this, we integrate out the carriers and treat the resulting disordered spin Hamiltonian within a local random phase approximation, whose reliabil…
The authors describe the fabrication of low loss Ge33As12Se55 rib waveguides. Pulsed laser deposition was used to obtain high quality, dense films with the same stoichiometry as the bulk glass, while standard semiconductor processing was used to pattern the waveguides. They obtained rib waveguides of 3, 4, and 5μm wid…
Self-assembling diblock copolymer, polystyrene-b-poly-4-vinylpyridine (PS-b-P4VP), was used as the template for fabricating phase change nanostructures. The high density GeSb nanodots were formed by etching into an amorphous GeSb thin film using silica hard mask which was patterned on top of polymer. The nanodot array…
Optical phonons assisted infrared absorption in VO2 based bolometer is demonstrated to be free, low, or over damping oscillation over different spectral ranges depending on the passivation thickness. In particular, it will become saturated due to the over damping oscillation in the spectral range corresponding to the…
Abstract A polyoxometalate with two alkyl thiol appendages, Q 4 [SiW 11 O 40 (SiCH 2 CH 2 CH 2 SH) 2 ] (Q=ammonium salt) stabilized the formation of palladium nanoparticles. This tethered polyoxometalate–palladium binary catalyst was effective for the aerobic oxydehydrogenation of vinylcyclohexene and vinylcyclohexane…
The observation of the anomalous Hall effect (AHE) in Co-doped TiO2 ferromagnetic semiconductor in the anatase phase is reported. An AHE is observed with magnetic hysteresis consistent with remanence and coercivity obtained from magnetometry data. The anatase films also have reasonable mobility (∼17cm2∕Vs) at room tem…
Abstract We have developed a new molecular thermodynamic model to predict the glass transition temperature ( T g ) of nanocomposites consisting of polymer (1) and nanoparticle (2) based on the configurational entropy model and the Flory–Huggins theory. Four configurational entropies have been taken into account in thi…
Based on extensive density-functional theory calculations, the spatial distribution and magnetic coupling of Mn atoms in Mn:GaN have been reinvestigated by doping up to five Mn atoms in large supercells, where the formation energies and the electronic structure for both the neutral and charged valence states are studi…
In order to better control the adsorption of proteins on mineral surfaces, it is useful to gain a thorough understanding of the behaviour of their constituting monomers, namely, amino acids. We have therefore investigated the adsorption of glycine, lysine, and other small biomolecules on well-characterised surfaces of…
Abstract In this paper, the fabrication of an active surface‐enhanced Raman scattering (SERS) substrate by self‐assembled silver nanoparticles on a monolayer of 4‐aminophenyl‐group‐modified glassy carbon (GC) is reported. Silver nanoparticles are attached to the substrate through the electrostatic force between the ne…
Eng oder weit: Über die Torsionsspannung lässt sich die Ganghöhe helicaler Nanostrukturen zwischen einigen zehn und einigen hundert Nanometern einstellen. Dabei zwingt eine sterisch verursachte Torsionsspannung an den primären Helices die sekundären Helices in Superhelices, wobei die Ganghöhe von der Größe der Spannun…