Materials Literature
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Neutron irradiation of low-copper reactor pressure vessel steels containing manganese and nickel gives rise to microstructural changes and a deterioration of mechanical properties. This deterioration apparently progresses slower than in steels containing more than ∼0.1 wt% Cu. An acceleration of this process after the…
We present a comparative study in which 'pebble game' rigidity analysis is applied to multiple protein crystal structures, for each of six different protein families. We find that the main-chain rigidity of a protein structure at a given hydrogen bond energy cutoff is quite sensitive to small structural variations, an…
Using magic-angle spinning $^{125}\text{T}\text{e}$ and $^{207}\text{P}\text{b}$ NMR, we have discovered the presence of two phases of approximately tenfold different free-electron concentration, $n$, in high-performance thermoelectrics ${\text{Ag}}_{1\ensuremath{-}y}{\text{Pb}}_{18}{\text{Sb}}_{1+z}{\text{Te}}_{20}$…
The influence of Ce(IV) doping on ZTS and KHP crystals over a concentration range from 1 to 10 mol% in the solution during crystallization, which leads to a true concentration range from few ppm to few tens of ppm in the crystals has been investigated. The XRD and FT-IR analyses indicate that the crystal undergoes con…
The euryarchaeon Methanosarcina acetivorans has no homologues of the first three enzymes that produce the essential methanogenic coenzyme M (2-mercaptoethanesulfonate) in Methanocaldococcus jannaschii. A single M. acetivorans gene was heterologously expressed to produce a functional sulfopyruvate decarboxylase protein…
Pure carbon- (C), nitrogen- (N) and titanium- (Ti) doped diamond-like carbon (DLC) coatings were deposited on silicon (Si) micro-molds by dc magnetron sputtering deposition to improve the tribological performance of the micro-molds. The coated and uncoated Si molds were used in injection molding for the fabrication of…
We study the structure of clusters in a model colloidal system with competing interactions using Brownian dynamics simulations. A short-ranged attraction drives clustering, while a weak, long-ranged repulsion is used to model electrostatic charging in experimental systems. The former is treated with a short-ranged Mor…
Poly(ω-pentadecalactone- co -butylene- co -succinate) copolymers with various compositions were synthesized via copolymerization of dialkyl succinate with 1,4-butandiol and ω-pentadecalactone (PDL) catalyzed by immobilized Candida antarctica lipase B. The monomer unit ratio in the copolymers can be carefully controlle…
The properties of polymers are greatly enhanced when they are incorporated with silicate-layered clays as they find many applications in the fields of electronics, automobile industry, packaging, and construction. In this study a thermoplastic polymer poly(vinyl alcohol) (PVA) and montmorillonite (MMT) clay were used…
The tridentate proligands (RNH-o-C6H4)2O (1a, R = C5H9; 1b, R = Cy) were found to readily react with LiAlH4 to yield the corresponding lithium aluminium dihydrido salt species [eta(2)-N,N-{(RN-o-C6H4)2O}AlH(mu-H)Li(THF)]2 (2a, R = C5H9; 2b, R = Cy) in 50% and 42% yield, respectively. The solid-state structure of both…
Alterable roles of VC addition on the densification, microstructure development, and mechanical properties of the ZrB 2 –SiC ultrahigh temperature ceramics (UHTCs) were comprehensively investigated based on utilizing the thermodynamic analysis and experimental results. Chemical reactions of VC with the inevitably exis…
We review the experimental and computational studies of nanoparticulate ZnS, a system that has received much attention recently. We describe in detail how the nanoparticle structures evolve with increasing size. The results of the computational studies reveal intriguing families of structures based on spheroids, which…
Two homologous series of 2-(4-alkanoyloxybenzylidenamino)benzothiazoles and 2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles were synthesised and characterised. Their molecular structures differed wherein the latter comprised a lateral hydroxyl group, unlike the former. Spectroscopic techniques such as FT-IR,…
This paper reports the transformation of rhombic dodecahedral gold nanoparticles through two different pathways depending on the water content. The gold nanoparticles were prepared by reducing HAuCl4 with N,N-dimethylforamide in the presence of poly(vinyl pyrrolidone) and water. Not only the concentration of PVP but a…
Donor-acceptor systems based on subporphyrins with nitro and amino substituents at meta and para positions of the meso-phenyl groups were synthesized and their photophysical properties have been systematically investigated. These molecules show two types of charge-transfer interactions, that is, from center to periphe…
In the present work, nanocrystalline Ca 3 Y 2(1− x ) Si 3 O 12 :Eu x ( x =1, 5, 10, and 20 mol%) novel phosphors were synthesized by a sol–gel method. The effect of temperature and concentration on structural and luminescence properties of nanocrystalline powders were investigated under UV excitation. The X‐ray diffra…
An alloy engineering approach aiming to produce a fine two-phase mixture thermoelectric material is highlighted in order to reduce the thermal diffusivity. We utilized the spinodal decomposition in the PbTe-GeTe quasi-binary system to control the alloy microstructure through solutioning, quenching and aging treatments…
Extensive studies on polymer thin films to date have revealed their interesting but unusual properties such as film thickness dependence of glass transition temperature Tg and thermal expansivity. Recent studies have shown that the lower Tg is not always related to the higher mobility in polymer thin films, which cont…
A straightforward process was developed to synthesize monetite (CaHPO 4 , dicalcium phosphate anhydrous) powders at room temperature (21°±1°C) in ethanol solutions. The process reported here constitutes an alternative to well‐publicized monetite synthesis procedures based on the dehydration of brushite (CaHPO 4 ·2H 2…
The effect of acceptor concentration in (Mg)‐doped BaTiO 3 on the resistance degradation behavior was contrasted between coarse‐ and fine‐grain samples with ∼90 and ∼0.8 μm in size, respectively. Both cases showed similar trends that the time to degradation decreased systematically with the increase of acceptor concen…