Materials Literature
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Permanganate coatings show promise as replacements for chromate conversion coatings on aluminum alloys used in the aerospace industry. The development of permanganate conversion coatings on AA2024-T3 (UNS A92024) from acid solution was followed for up to 240 s using scanning electron microscopy (SEM), x-ray photoelect…
Phonon wavepacket propagation in defective carbon nanotubes has been investigated through molecular dynamics simulations. We have demonstrated that the wavepacket scattering method enable the phonon transmission function of carbon nanotubes to be determened with high accuracy. We have also found that the influence of…
Abstract Two new poly(amide‐imide)s containing cinnamoyl and azobenzene units have been synthesized by direct polycondensation reaction of two diacids having cinnamoyl units and a diamine incorporating azobenzene group, using triphenyl phosphite and pyridine as condensing agents. The polymers were readily soluble in v…
Abstract The hydrogen effect on dislocation nucleation in Ni single crystals with (111) surface orientation has been examined with the aid of a specifically designed nanoindentation set-up for in situ electrochemical experiments. The effect of the electrochemical potential on the indent load–displacement curve, especi…
A novel route was investigated for the preparation of metal injection moulding (MIM) titanium alloys by TiH2 powder. It can be known from the analysis of thermodynamics and kinetics of dehydrogenation reaction that decomposition occurs when hydrogen partial pressure is ∼10−2 Pa at 300°C. The temperature range of dehyd…
Two essential concepts for students to grasp in the undergraduate organic chemistry sequence are substitution chemistry and elimination chemistry (S N 1/S N 2 and E1/E2). However, students are often confounded by the seemingly endless series of structure–reactivity relationships. This dualistic relationship of concept…
The methods to prepare mesoporous silica materials and their derivatization by catalytically active functional groups covalently anchored to the surface are summarized. A short description of the major characterization techniques is also given. The transformations induced by solids with anchored basic functions mainly…
Hydrogen sulfide is a colorless and flammable gas under room temperature. Usually hydrogen sulfide is considered to be toxic; however, the recent research revealed that hydrogen sulfide in the cardiovascular system plays the role of a vascular dilator. The physiological role of hydrogen sulfide depends on its in vivo…
Abstract To undertake the development of technology to increase consumption of aluminum in passenger cars for improved fuel economy through lightweighting of cars as a measure to control global warming. More specifically, R&D is conducted on the following R&D themes to develop a material with a high formabilit…
Compósitos de fibras naturais lignocelulósicas reforçando matriz polimérica já estão sendo utilizados em diversos campos de interesse aplicado. Isto tem incentivado pesquisas científicas e tecnológicas tanto em fibras tradicionais, como o sisal e a juta, quanto naquelas, como as do curauá, que apresentam característic…
Exploratory analyses were performed by the RANNS code for simulated tests of the reactivity-initiated accident with two high-burnup pressurized water reactor rods in the Nuclear Safety Research Reactor (NSRR). The code performs thermal and finite element mechanical calculations in an axis-symmetrical cylinder geometry…
Abstract A method is presented for synthesizing surfactant‐free latexes comprising a starch‐ graft ‐vinyl polymer, (1) starting with a suspension of the highly branched starch amylopectin, either native or degraded, (2) then using ozonolysis to create free‐radical initiation sites on this amylopectin scaffold, and (3)…
A reversible nonvolatile capacitance change effect has been observed in perovskite oxide thin films at room temperature under the application of electrical pulses of low voltage and short duration. The pulse-induced nonvolatile capacitance change is seen to coexist with a pulse-induced nonvolatile resistance change re…
We have shown that the thermal oxidation (473–773 K) of polycrystalline lead selenide layers, undoped and doped with bismuth, cadmium, tin, and chlorine, has similar effects on their electrical properties, microstructure, and phase composition. The rate of oxygen diffusion and the formation kinetics of oxide phases de…
Light water reactor fuel is operating in an increasingly challenging environment. Fuel burnup extension and cycle length increase both can increase the local duty. Reactor water chemistry modifications for the purpose of protection the plant system materials have the potential of increasing fuel surface deposition and…
Abstract In the present study homoepitaxial diamond films have been grown by microwave plasma chemical vapour deposition (MWPCVD) on (001)‐oriented Ib HPHT substrates with off‐axis angles of up to 11°. Freestanding films of several hundred microns thickness were produced by removal of the Ib substrate and of the polyc…
In this work, the drug loading and in vitro release properties of PLGA-mPEG nanoparticles were studied. Three methyl-xanthine derivatives differing significantly in aqueous solubility, i.e., caffeine, theophylline, and theobromine, were employed as model drugs. Two different PLGA-mPEG copolymer compositions, namely PL…
Abstract New phosphorous‐containing poly(ester‐imide)s have been prepared by polycondensation in solution at high temperature of a p ‐hydroxyphenol containing phosphorus, namely 2‐(6‐oxid‐6 H ‐dibenz<c,e><1,2>oxaphosphorin‐6‐yl)‐1,4‐benzenediol, with various aromatic diacide chlorides containing preformed…
Pores in feldspars, the most common silicates, are of great interest for the estimation of internal weathering reactions. Here, we compare three different methods to characterize the porosity of feldspars from four soils of granite and saprolite developed on granites in Germany (Black Forest, Harz mountains). Besides…
Abstract Biomaterials play an important role in most tissue engineering strategies. They can serve as substrates on which cell populations can attach and migrate, can be used as cell delivery vehicles and as bioactive factor carriers to activate specific cellular functions. A series of biodegradable polyurethanes (PUs…