Materials Literature
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The production yields of H(D) atoms in the reactions of N(2)(A (3)Sigma(u) (+)) with C(2)H(2), C(2)H(4), and their deuterated variants were determined. N(2)(A (3)Sigma(u) (+)) was produced by excitation transfer between Xe(6s[32](1)) and ground-state N(2) followed by collisional relaxation. Xe(6s[32](1)) was produced…
Shaping up: Unusual bowl-, trough-, and ring-shaped structures result from the temperature-induced self-assembly of nanoparticles (see picture for bowl). The obtained ZnO bowls and rings also serve as a template to make metal or metal oxide replicas. The tiny bowls are envisaged not only to hold fluids of ultralow vol…
Low temperature photoluminescence (PL) measurements were carried out to investigate optical transition characteristics of ZnO nanowires, Ni nanodot, and NiO coated ZnO nanowires (NWs). PL emission spectra show emission peaks of distinctive bound exciton to neutral donor (DX0) and to acceptor (AX0) transition. The auth…
X-ray photoelectron spectroscopy (XPS) measurement of the ratio of poly(3,4-ethylenedioxythiophene) (PEDT) to polystyrenesulfonate (PSS) reveals accumulation of PEDT+ at the interface between the PEDT:PSSH hole-injection layer and the organic semiconductor during diode operation. This ionic drift of PEDT+ occurs even…
Ti—6Al—4V matrix composites enhanced by alumina tubes filled with boron carbide, alumina rods, and alumina plate is termed high gradient composite because of the big density differences among Ti—6Al—4V, alumina, and boron carbide materials. This high gradient composite has been developed for a theoretical study to hel…
( Co x Al 1 − x ) 2 O 3 − v oxide magnetic semiconductor films were synthesized by introducing an impurity band in the insulating Al2O3 band gap, and the corresponding granular films were obtained by annealing. For both kinds of films, their electrical transport properties are well described by spin dependent variable…
A new aromatic diamine monomer containing both pyridine and fluorine, 2,6-bis(4-amino-2-trifluoromethylphenoxy-4 ' -benzoyl)pyridine (BAFP), was successively synthesized by the nucleophilic substitution reaction of 2,6-bis(4,4 ' -dihydroxybenzoyl)pyridine with 2-chloro-5-nitro-trifluoromethylbenzene in the presence of…
The new arsenates KFe 3 (AsO 4 ) 2 (HAsO 4 ) 2 ( C 2/ c ; Z = 4; a = 18.975(4), b = 6.5850(13), c = 10.955(2) A, β = 100.42(3)°, V = 1346.3(5) A 3 ) and K(H 2 O) M 3+ (H 1.5 AsO 4 ) 2 (H 2 AsO 4 ) ( P 2/ n ; Z = 2; a = 4.700(1), 4.641(1), 4.798(10); b = 8.712(2), 8.696(2), 8.832(2); c = 13.828(3), 13.772(3), 13.971(3)…
The polyimides containing the hydroxy group were synthesized from 3,3 ' -dihydroxybenzidine (I) and previously prepared tetracarboxylic dianhydrides, 3,3 ''' ,4,4 ''' - p-quaterphenyltetracarboxylic dianhydride (IId), 3,3 '''' ,4,4 '''' - p-quinquephenyltetracarboxylic dianhydride (IIe) and 3,3 ''''' ,4,4 ''''' - p-se…
The infrared (IR) transmitting nanocrystallized chalcogenide glass only containing α-CdGa2S4 IR nonlinear optical crystallites, which were confirmed by x-ray diffraction and Raman scattering measurements, was fabricated through the controllable nucleation and crystallization of the glass with the composition 82GeS2∙18…
A rare mineral schafarzikite, an oxide of Fe 2+ and Sb 3+ , was found after more than 80 years at the type locality near Pernek (Male Karpaty Mountains, Slovak Republic). Crystals, druses, and crusts of schafarzikite occur on fractures in quartz-carbonate-stibnite hydrothermal ores. The Sb mineralization is bound to b…
Avian eggshell is a relatively simple model of biomineralization processes. This biomaterial consists mainly of a mineral part made of columnar calcite crystals and a pervading organic matrix. The organization of eggshell microstructure is determined by genetic, physiological and external factors. Eggshell microstruct…
Abstract In this study, we investigated the melting and crystallization behavior of polyhedral oligomeric silsesquioxane (POSS)‐capped poly(ε‐caprolactone) PCL with various lengths of PCL chains by means of X‐ray diffraction and differential scanning calorimetry. This organic–inorganic macromolecule possesses a tadpol…
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…