Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The computer simulation of the kinetic scheme advanced for the thermostimulated polycondensation of aspartic acid in the solid phase is performed. The scheme includes the autocatalytic growth of a polymeric chain followed by polymer dehydration. This process occurs simultaneously in two matrix zones with identical rea…
Raw palygorskite was modified by the addition of selected surfactants, viz. hexadecyltrimethylammonium bromide (CTAB), cetylpyridinium bromide (CPB) and octadecyldimethylbenzyl ammonium chloride (ODBAC). These modified clays were used as sorbents for the adsorptive removal of 2,6-dichlorophenol (2,6-DCP) from aqueous…
In order to study the low-temperature expansion process of NiTiNb shape memory alloy, this paper makes use of numerical simulation method to complete the simulations and analysis. The shape memory effect of NiTiNb alloy pipe joints under different expansion temperatures and expansion strains have been compared and eva…
The effect of internal diffusion on preferential CO oxidation in a hydrogen-rich mixture on a copper-cerium catalyst in a microchannel reactor was estimated. It was found that the internal effectiveness factor η CO > 0.8 was reached at a catalytic coating thickness of ∼30 μm.
Methods of X-ray diffraction and transmission electron microscopy were used to study the microstructure of dispersion-strengthened Cu-Al 2 O 3 nanocomposites obtained by the method of simultaneous deposition of Cu and Al 2 O 3 from the vapor phase. The effect of the size of particles of the oxide (Al 2 O 3 ) and of th…
Based on the results of experimental and theoretical investigations, the parameters of deformation and high-speed hardening for the VT6 alloy at deformation temperatures of 780–940°C and rates from 0.5 × 10 −3 to 1 s −1 are determined. A mathematical model of upsetting for VT6 samples that have a symmetrically truncat…
In bench tests, the use of brittle tensosensitive rosin coatings for defect detection and strength assessment of the weld seam close to T pieces in oil pipelines is considered. The cracking pattern in the brittle coating yields a map of the stress-strain state at the surface of the T piece over the perimeter of the si…
A new chitosan ester derivative, chitosan p-hydroxybenzoate is synthesized, which is expected to have antimicrobial activity similar to parabens. The amino group of chitosan reacts well with acyl chloride to prepare a N-amic acid-chitosan. The amino group of chitosan must be protected before synthesizing a 6-O-chitosa…
A technique of the electron probe microanalysis of semiconductor heterostructures consisting of nanolayers is described. Features of the microanalysis of such structures are compared to the analysis of structures with thicker layers and of homogeneous samples. Possibilities of the method are illustrated by an example…
Relaxor ferroelectric Pb(Sc1/2Nb1/2)O3 (PSN) superfine ceramics were fabricated by spark plasma sintering process and subjected to an annealing in oxygen ambience at a low temperature of 500°C. The microstructure of the PSN ceramics was examined by X‐ray diffraction and scanning and transmission electron microscopy, w…
Given the rapidly developing areas of physical and chemical sciences, the physics and chemistry of a new class of piezoelectric materials on the basis of a hybrid matrix of nano- and mikropyezoelektric composites has arisen. For this goal, we developed the following technologies of hybrid composites and a method of co…
Abstract We report the growth of cubic GaN/AlN superlattices by plasma‐assisted molecular beam epitaxy on 3C‐SiC substrates. The samples consist of 100 nm thick unintentionally doped GaN buffer and 20‐40 period superlattices of silicon doped GaN quantum wells embedded in undoped AlN barriers. The thickness of the AlN…
One best way to harness the petroleum-based solid wastes is to develop biodegradable materials. Among which, PLA is the most important one, because it is made from renewable plant. But Poly(lactic acid) (PLA) is brittle and low impact resistance. The cellulose nanowhiskers are about 5-40 nm in diameter and the length…
The molecular dynamics parameters and hydrophobicity of the surface of Silasorb silica gel particles covalently modified with alkyl C n H2n + 1 groups differing in length (n = 2, 8, 18) were studied by electron paramagnetic resonance using spin probes of different structures, sizes, and electrical charges. It has been…
Most magnesium tubes are produced by extrusion, however roll forming could be another process to produce magnesium tubes since magnesium alloy sheet has become popular. In this study, to design the roll forming line for magnesium alloy AZ31B tube, finite element analysis was conducted to determine the design solution…
We discuss the potential use of multicomponent reactions in developing small-molecule probes of GABA(A) receptor function. Two examples that illustrate this approach are presented: the synthesis of a class of compounds that specifically modulate the function of GABA(A) receptors containing the δ-subunit, and also 'cag…
The structure of aluminum(III) tris-dipivaloylmethanate (Bruker Nonius X8 Apex diffractometer with a 4K CCD detector, λMoK α, graphite monochromator, T = 150(2) K) is determined, and the synthetic procedure for its preparation is suggested. Crystal data are: C2/c space group, a = 28.1587(12) Å, b = 18.5170(7) Å, c = 2…
Nickel oxide ( NiO ) thin films were deposited on glass substrates by reactive direct current (DC) magnetron sputtering of a Ni target in an Ar / O 2 mixture. The effect of thickness (0.2 μm, 0.4 μm and 1 μm) on the structural and surface morphological properties of NiO thin films was investigated. These films were ch…
Nanoindentation technique was employed to study the hardness and elastic modulus for different regions in the welded joint of high strength steel. And the variation in mechanical behavior at micro scales was analyzed combined with microstructure observation. Experimental results showed that both maximum hardness (4.11…
In this investigation, in order to research the influence of magnetic field on microstructure and properties of magnesium alloy welded joint, the AZ31 magnesium alloy plates which was 5mm were welded by GTAW under longitudinal magnetic field. The tensile test, hardness test and SEM were taken place to analyze the prop…