Materials Literature
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Crystallization of lysozyme from solutions has been studied by the atomic force microscopy method. The surface morphology and the growth kinetics of several faces of the orthorhombic and monoclinic modifications of lysozyme crystals are considered. The surface images are obtained at molecular resolution. For the (010)…
Abstract Polyolefins (LDPE and HDPE) can be ozonized with ozone/air gas flow to create peroxide and hydroperoxide groups on polymers. These reactive groups can be used to initiate radical polymerization of vinylic monomers and produce graft copolymers. In this study, the optimization of the experimental conditions and…
A DFT study of CC bond hydrogenolysis in alkanes on silica-supported zirconium monohydrides (Si−O)3ZrH and dihydrides (Si−O)2ZrH2 shows that only the latter are capable of catalysing this process under mild conditions.
A sol–gel reaction starting from Si and Zr alkoxides, in water–ethanol mixtures, was employed to obtain iron doped zirconium silicate powders (zircon). The speciation of the ferric salt to be added to the starting mixture was varied, the anion matching, in each case, the anionic partner of the acid catalysing the gel…
9-Unsubstituted dipyrrinone 8, the useful precursor for the synthesis of biliverdins, bilirubins, and other bile pigments, was synthesized in large scale and high yield starting from acetaldehyde and nitroethane in eight steps with overall yield 10%. The key intermediate 3,4-dimethyl-2-ethoxycarbonylpyrrole 3 was synt…
LPM
In this investigation, the dissolution and repassivation kinetics of a super martensitic (SM) stainless steel (Fe-12.3Cr-6.5Ni-2.6Mo) have been characterized using the artificial pit technique. As a part of this study, a diffusion model has been developed and employed for calculation of the pit surface concentration o…
Although the calculation of transport properties of complex-shaped particles (Smoluchowski rate constants for diffusion-limited reactions, Stokes friction coefficient, virial coefficients for conductivity, viscosity and other transport properties) is straightforward in principle, the accurate evaluation of these quant…
A new process, duplex hardening, was developed, for two steels which are already widely used for aerospace applications, M50 and M50 NiL. The rolling contact fatigue and sliding wear performance of duplex hardened bearing components were evaluated on M50 and M50NiL steels. The rolling contact fatigue and sliding wear…
With the electron spin resonance (ESR) technique, the inhibitory effects of chitosan on superoxide anion radicals and linoleic acid lipid radicals were found. The inhibitory ratio E for these two kinds of radicals is in proportion to the concentration of chitosan. It was also observed that E for linoleic acid lipid ra…
The distribution of hydrogen occluded in high strength bolts tightened beyond the yield strength and exposed for 9 years has been investigated to establish an evaluation method for delayed fracture property. Hydrogen thermal desorption analysis was employed for determining hydrogen content in specimens cut out from th…
SUMMARYVoltammetry and EIS were used to study the adsorption behaviour of laprol 2402 C (the copolymer of ethene and propene oxides) on a Sn electrode in strongly acid Sn(II) sulphate solutions. At least two states of adsorption layers were found to exist depending on cathodic polarisation. Adsorption of laprol, obser…
Carbon single-wall nanotubes (SWNTs) and other nanostructured carbon materials have attracted considerable interest recently due to several reports of high hydrogen storage capacities at room temperatures. Other reports indicate room temperature storage capacities are ~ 0 wt%. All in all, the reported capacities on th…
An improvement in ferroelectric device technology has become possible through optimization of the properties of the ferroelectric materials used to make the devices. The improvements discussed herein impact true time delay line and phase shifter performance by enhancing control over dielectric constant and extending t…
A new polythiogallate, CsGaS3, has been synthesized using molten flux of caesium polysulfide, and structurally characterized, by single crystal X-ray diffraction techniques, as possessing one-dimensional GaS3− chains, built from GaS4 tetrahedra. Cs+ ions undergo facile ion-exchange, at room temperature, with Rb+, NH4+…
A three-dimensional (3D) model has been developed for simulation of the physical properties of an electrically driven shape memory alloy (SMA) microactuator used for control of a microvalve. The mechanical behavior is decribed by a two phase macromodel taking into account material and geometrical nonlinearity. The sim…
We report here the investigations on the corrosion of Zircaloy-4 cladding in out-of-pile and in-pile loops. Tests were conducted on the cladding in the fresh, preoxidized, and preirradiated conditions. The exposures were in low and high lithium coolant, with and without boron, and under single-phase and two-phase heat…
A novel nanomaterial, an array of zinc oxide (ZnO) and polyaniline (PANI) coaxial nanowires, was synthesized using an anodic aluminum oxide (AAO) membrane as the template. The morphology of these coaxial nanowires was observed with transmission electron microscope (TEM). The experiments on photoluminescence (PL) of co…
Tyrosine-based pseudo-peptide polymers, first introduced in 1987 by Kohn and Langer, have been identified for potential biomaterial applications. These materials combine the desired polypeptide properties of biocompatibility, biodegradability, non-toxicity, and non-immunogenicity with good processing properties includ…
Numerous thermal vacancies are frozen into FeAl B2-ordered alloy ribbons by a conventional rapid-solidification technique. Through heat treatment at 723 K, clustering of the supersaturated vacancies generates a large number of nanopores, particulary near surfaces, thus creating nanoporous surfaces. The nanoporous surf…