Materials Literature
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BaTi 1- x Mn x O 3 solid solutions with 0≤ x ≤0.04 were synthesized in reducing atmosphere ( P O2 <10 -9 Pa) and in air at 1350°C for 2 h. The effect of Mn ions with different valences on the crystal structure of BaTiO 3 was studied by the room-temperature Raman scattering, electron spin resonance (ESR) and X-ray p…
Esters or carbonates of N-hydroxypyridine-2-thione (Barton esters) were appended to either carboxymethyl or hydroxypropyl cellulose. Irradiation of the cellulose bound Barton esters in monomer initiated free radical graft copolymerization with minimal concomitant homopolymerization. Grafting of styrene to carboxymethy…
A method for estimating the signal-to-noise ratio from a single image is presented in this paper. The autocorrelation-based technique requires that image details be correlated over distances of a few pixels, while the noise is assumed to be uncorrelated from pixel to pixel. The latter is shown to be a good approximati…
The infrared to visible upconversion processes have been investigated for ${\mathrm{Nd}}^{3+}$-doped chalcohalide glasses with different halide modifiers by using steady-state and time-resolved laser spectroscopy. Two different upconversion mechanisms have been identified depending on the infrared excitation wavelengt…
Allosteric regulation of key metabolic enzymes is a fascinating field to study the structure-function relationship of induced conformational changes of proteins. In this review we compare the principles of allosteric transitions of the complex classical model aspartate transcarbamoylase (ATCase) from Escherichia coli,…
The polycondensation reactions of luminophoric dialdehydes 5 and bisphosphonates 3 provide a new type of π-conjugated polymers 7 with well-defined structure (—Ar—C≡C—Ar—C≡C—Ar—CH=CH—Ar— CH=CH—)n , which was confirmed by NMR, infrared and UV-Vis spectroscopy. High molecular weight (M̄w up to 500 000 g/mol), thermostabl…
The bulk morphology of a crystalline/amorphous diblock copolymer under different thermal conditions was studied. The diblock copolymer, poly((ethylene oxide)- b -1,4-polybutadiene), forms a microphase-separated lamellar morphology in the molten state. For samples crystallized within the range of 20−50 °C, TEM coupled…
Abstract Poly(amic acid) nanocomposites were synthesized from a dimethylacetamide (DMAc) solution with two organophilic montmorillonites (organo‐MMTs). It was then heated at various temperatures under vacuum, yielding 15–20 um thick films of polyimide/organo‐MMT hybrid with different clay contents (1–8 wt%). Dodecy‐la…
Abstract High internal phase emulsion (HIPE) copolymer and interpenetrating network foams were prepared from 2‐ethylhexyl acrylate (EHA), styrene (S) and divinylbenzene (DVB) using a unique process. The morphologies, thermal properties and dynamic and static mechanical properties of these foams were investigated. The…
MINCRYST is an original interrelated combination of the Crystal Structure Database for Minerals, Subbase of Calculated Polycrystal Standards (Calculated Powder X-ray Diffraction Standard Subbase, CPDS Subbase), and the Applied Program Package. The Information fund of the Crystal Structure Database comprises about 4800…
Abstract Crystallization of the 80Li2S·20P2S5 (mol%) glassy powders derived from mechanical milling improved their conductivities. The obtained glass–ceramic exhibited high conductivity of approximately 10−3 S cm−1 at room temperature. The stabilization of the high-temperature phase of Li7PS6 crystal in the glass matr…
We report photoemission spectroscopic studies of zinc sulfide nanocrystallites in the quantum size regime. The nanocrystallites studied have average sizes of 1.8, 2.5, and 3.5 nm and narrow size distributions as determined from UV-visible absorption spectroscopy, as well as x-ray diffraction and high-resolution transm…
First-principles molecular dynamics simulations are carried out to study the structural properties of liquid ${\mathrm{GeSe}}_{2}.$ We use a generalized gradient approximation for the exchange and correlation energy, which we find to improve significantly upon the local density approximation in describing both the sho…
A study was made of a series of one-layer and two-layer models of graphite surface and especially of interactions in the two-layer models. Seven one-layer models, of increasing size up to seven rings, in the C 6 n 2 H 6 n series were calculated for reference purposes with the Hartree−Fock method. Four two-layer models…
The morphology of monoclinic paracetamol crystals has been investigated both theoretically and experimentally. Calculations using the computer program HABIT 95 with both DREIDING II and MOMANY force fields predict prismatic forms in which {100}, {001}, {110}, and {201̄} show approximately equivalent morphological impo…
A series of organosilicates were prepared using 1,2-bis(trimethoxysilyl)ethane (BTME) as silica precursor and alkyltrimethylammonium chloride (C n TMACl) surfactants with different chain lengths ( n = 8, 10, 12, 14, 16, 18) as supramolecular templating materials. 13 C and 29 Si NMR data showed that after surfactant ex…
We report molecular dynamics calculations of the phase transition of copper precipitates in iron. We simulate a precipitate having undergone a phase transition from a bcc structure coherent with the iron matrix to a non-coherent close packed structure, as has been observed experimentally. Analytical tools were develop…
Ferroelectric random access memories (FRAMs®) are nonvolatile integrated circuit memories that store data by using the field switchable polarization state of a ferroelectric material. Besides allowing unique applications, FRAM memories are ideal replacements for standard random access memory, erasable programmable rea…
Macromolecular nanoplatelets of the ferroelectric oxide Bi4Ti3O12 were synthesized by exfoliation reaction for the first time. Formation of the exfoliated nanoplatelets was confirmed by atomic force microscopy (AFM) and high-resolution transmission electron microscopy (HRTEM).
Mullite/SiC composite ceramics were sintered and subjected to three‐point bending of specimens made according to the appropriate JIS standard. A semicircular surface crack 100 to 250 μm in diameter was made on each specimen. We systematically studied crack‐healing behavior and cyclic‐ and static‐fatigue strengths at r…