Materials Literature
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Ti3SiC2 is a so-called not-so-brittle ceramic that combines the merits of both metals and ceramics. However, many previous works demonstrated that its bonding nature and properties were strongly related to TiC. In this paper the crystallographic relations between Ti3SiC2 and TiC were established and described based on…
Morphological effects on molecular mobility have been studied for solid ultrahigh molecular weight polyethylenes (UHMW-PE) crystallized from the melt and from solution or during polymerization. On the basis of transmission electron microscopic (TEM) observation, a crystalline domain structure was well identified for n…
Light-induced excited spin state trapping of Fe(phen) 2 (NCS) 2 is studied by X-ray absorption spectroscopy using synchrotron radiation. The molecular structure of the excited high-spin state at 17 K is investigated by EXAFS. The relaxation of the light-induced high-spin state at various temperatures is monitored thro…
A procedure is described for estimating the background outline in powder diffraction patterns. It essentially consists of an extension of traditional smoothing procedures to include Bragg peaks in addition to profile random fluctuations. This approach is particularly suited for dealing with diffraction patterns obtain…
The cationic polymerization of 3-methyl-3-oxetanemethanol was initiated using BF3·OEt2. The low ratio of catalyst to monomer results in a mainly linear or slightly branched polymer, and the high catalyst to monomer ratio leads to a hyperbranched polymer. The hyperbranched polyether yielded is amorphous, and the essent…
A novel system of symmetric and non-symmetric dimers containing azobenzene groups has been synthesized and studied in an attempt to understand further the molecular origins of the intercalated smectic phases. For the non-symmetric dimers, the lack of symmetry was derived solely from the differences in length of the tw…
A phase-field model of eutectic growth is proposed in terms of a free energy F, which is a functional of a liquid-solid order parameter psi, and a conserved concentration field c. The model is shown to recover the important features of a eutectic phase diagram and to reduce to the standard sharp-interface formulation…
Cupric oxide (CuO) nanoparticles have been prepared in amorphous SiO2 matrix using a novel variant of sol-gel technique. The method is based on the poly-condensation of a silica source (sodium silicate) in the presence of an aqueous solution containing complex of Cu(II) with polyvinyl alcohol (CuPVA). After gelation,…
Abstract Smectites synthesized from experiments at 5.5 GPa and 1500°C are of high quality, crystals are large at >10 μm, and the 2:1 layers may have a homogeneous charge distribution. Smectite was exchanged with various cations (Na + , Li + , K + , Ca 2+ , and Mg 2+ ) and the hydration behavior of each sample was o…
This paper examined the room‐temperature mechanical properties of a mixed‐conducting perovskite La 1– x Sr x Co 0.2 Fe 0.8 O 3 ( x = 0.2–0.8). Powders were made by the combustion synthesis technique and sintered at 1250°C in air. Sintered density, crystal phase, and grain size were characterized. Young's and shear mod…
The ZrC coating layer is a candidate to replace the SiC coating layer of the Triso-coated fuel particle. To compare the irradiation performance of the ZrC Triso-coated fuel particles with that of the normal Triso-coated fuel particles at high temperatures, a capsule irradiation experiment was performed, where both typ…
Measurements of the optical birefringence were used to probe the relaxation of rubbed ultrathin polystyrene (PS) films on glass substrates. It was found that the glass transition temperature, T g, of the films dropped by 15−20 K as the film thickness decreased from 10 μm to 5.8 nm. Experiments on thick films (∼10 μm)…
Epitaxial crystallization is utilized to control both molecular chain orientation and microdomain structure in a thin film of a semicrystalline triblock copolymer, composed of crystallizable polyethylene (PE) end blocks and an amorphous ethylene- alt -propylene (PEP) midblock where the microphase separation is driven…
Several types of mcl-PHAs were produced by Pseudomonas putida KT2442 at pilot and laboratory scales from renewable long-chain fatty acids (LCFAs) and octanoic acid. These and other mcl-PHAs are now available in sufficient amounts to carry out application and processing studies. We have isolated and purified these poly…
Eggshell formation takes place on the eggshell membrane in an acellular medium, the uterine fluid that contains the inorganic minerals and precursors of the organic matrix. The high degree of eggshell structure could be due to an interaction between calcium carbonate and the organic matrix. The aim of this study was t…
Supramolecular assemblies of surfactant moleculesare often used to synthesize mesoporous silica (MPS). However, elimination of the surfactant molecules by conventional thermocalcination after MPS film synthesis often leads to film distortion or breakage. Here the effective removal of surfactant molecules at room tempe…
Lead zirconate titanate (PZT) (52/48) powders were prepared by a sol–gel process, using different raw materials to introduce the lead component together with several solvents and chemical modifying agents. A study of the effect of these variables on crystallization behavior was conducted to determine the best conditio…
B-band lipopolysaccharide is an important virulence factor of the opportunistic pathogen Pseudomonas aeruginosa. WbpP is an enzyme essential for B-band lipopolysaccharide production in serotype O6. Sequence analysis suggests that it is involved in the formation of N-acetylgalacturonic acid. To test this hypothesis, ov…
Abstract Dissolved water has significant effects on the physical and chemical properties of silicate melts. Some of the different approaches towards understanding these effects are reviewed here. Spectroscopic measurements on hydrous glasses quenched from melts provide good models for the structure of the melts at the…
A recently developed new liquid crystal display, which operates in the fringe-field switching mode, is known to exhibit high transmittance as well as a wide viewing angle unlike the conventional in-plane switching (IPS) mode display. The device shows unique electro-optic behavior, nevertheless the liquid crystal direc…