Materials Literature
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The self consistent effective medium approximation (SEMA) is used to study three-dimensional random conducting composites under the influence of a strong magnetic field {\bf B}, in the case where all constituents exhibit isotropic response. Asymptotic analysis is used to obtain almost closed form results for the stron…
Jarosite family compounds, KFe_3(OH)_6(SO_4)_2, (abbreviate Fe jarosite), and KCr_3(OH)_6(SO_4)_2, (Cr jarosite), are typical examples of the Heisenberg antiferromagnet on the kagome lattice and have been investigated by means of magnetization and NMR experiments. The susceptibility of Cr jarosite deviates from Curie-…
The finite element method (FEM) is used to study the influence of porosity and pore shape on the elastic properties of model porous ceramics. The Young's modulus of each model was found to be practically independent of the solid Poisson's ratio. At a sufficiently high porosity, the Poisson's ratio of the porous models…
The critical fluctuations in SrTiO$_3$ near its $105 K$ structural phase transition were studied with triple axis diffractometry using high energy ($\ge 100 keV$) synchrotron radiation in different SrTiO$_3$ crystals with different oxygen vacancy concentrations. Due to the presence of oxygen vacancies the critical beh…
(3-(2-(2-Tetrahydropyranyloxy)ethyl)thiophene) (THPET) was homopolymerized (PTHPET) and copolymerized with 3-hexylthiophene (PTHPET- co -3HT) to obtain functionalized regioregular π-conjugated polymers. Thermolytic and catalytic removal of the bulky tetrahydropyran (THP) group from thin solid films of the polymers was…
MSU- X materials are a family of ordered mesoporous silica obtained through an assembly mechanism between nonionic poly(ethylene oxide)-based surfactants and silica precursors. Until now, among many advantages, the main drawback of this synthesis was the cost of the silica source, a silicon alkoxide that prevented any…
A simple and convenient solvothermal process has been developed for the preparation of CuInE2 (E = S, Se) nanorods from the elements in ethylenediamine at 280 °C. Liquid In and the strong capacity of ethylenediamine were found to play important roles in the nanorod growth and electron-transfer process.
Systematic properties of the first excited state are presented for various ring sizes and spin quantum numbers which are only partly covered by the theorem of Lieb, Schultz and Mattis. For odd ring sizes the first excited energy eigenvalue shows unexpected degeneracy and related shift quantum numbers. As a byproduct t…
Nanoparticle research is still a rapidly growing field of science. Semiconductor nanocrystals of a large variety of compositions have been prepared in exceedingly good quality. State-of-the-art preparations and standard characterization methods are discussed. The build-up of more complex nanoheterostructures is report…
Single crystals of the new copper(II) germanate K 2 Cu 3 Ge 5 O 14 have been grown. Conditions for the synthesis are reported. The crystal structure of this material has been established by single-crystal X-ray diffraction: triclinic, space group P 1̄ a = 6.1859(4) Å, b = 7.1484(5) Å, c = 7.8491(5) Å, α = 82.150(1)°,…
Ternary blends of high-density polyethylene (HDPE) with atactic polystyrene (PS) and styrene–ethylene/butylene–styrene block copolymer (SEBS) were deformed by plane–strain compression in a channel die. The samples were deformed up to the true strain of 1.8 (compression ratio of 6) at 100°C. Thermal and mechanical prop…
Plastic prepared from formulations of cornstarch and poly(β-hydroxybutyrate-co-β-hydroxyvalerate) (PHBV) biodegraded in tropical coastal waters. Biodegradation was monitored for 1 year. Starch—PHBV bioplastic appeared to lose weight in two overlapping phases until both biopolymers were entirely consumed. To examine th…
The affects of polymer chemistry on the organic solvent activity of alpha-chymotrypsin-containing biocatalytic plastic materials are investigated in this study. To incorporate alpha-chymotrypsin into the polymer, the enzyme is first acryloylated, then solubilized into organic solvents via hydrophobic ion paring with s…
Transient plane source technique was used for the simultaneous measurement of thermal conductivity and thermal diffisivity of three-phase styrene butadiene rubber composites. Two series of styrene butadiene rubber composites were studied, having natural rubber as a variable filler in both the composites along with 10…
Ternary in situ composites based on poly(butylene terephthalate) (PBT), polyamide 66 (PA66), and semixflexible liquid crystalline polymer (LCP) were systematically investigated. The LCP used was an ABA30/PET liquid crystalline copolyesteramide based on 30 mol % of p-aminobenzoic acid (ABA) and 70 mol % of poly(ethylen…
A molybdate series with Sc 2 (WO 4 ) 3 -type structure, which has been demonstrated to be suitable for trivalent ion conduction, was prepared, and the trivalent ion conducting characteristics of this series were compared with those of the tungstate series. The ionic conductivities of the molybdate series become consid…
The macroscopic properties of binary alkali phosphate glasses are characterized by the presence of unexpected minima in the glass transition temperatures at alkali concentrations near 20−25 mol %. In the present study, the structural origin of this behavior is explored on the basis of multinuclear single- and double-r…
Luminescent micellar aggregates and spherical vesicles self-assembled from polyquinoline−polystyrene diblock and polyquinoline−polystyrene−polyquinoline triblock copolymers were investigated by photoluminescence excitation and emission spectroscopies and fluorescence microscopy. In both the diblock micelles and triblo…
Rubber–rubber blends are used widely in industry, for example, in tire manufacture. It is often difficult to characterize interfaces in such rubber–rubber blends quantitatively because of the similarity in the chemical structure of the component rubbers. Here, a new method was suggested for the measurement of the weig…
The effect of substitution of nonmagnetic Al 3+ ions on the electrical and magnetic properties of Mg–Mn ferrites was studied in the ferrite series Mg 0.9 Mn 0.1 Al x Fe 2-x O 4 where x varied from 0–0.5 in steps of 0.1. The incorporation of Al 3+ ions in place of Fe 3+ ions results in a decrease of the lattice paramet…