Materials Literature
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Maltooligosyl trehalose synthase, one of the two enzymes in the coupled trehalose biosynthesis system in Sulfolobus acidocaldarius, has been purified and crystallized. The chemical modification of this enzyme by reductive methylation of lysine residues significantly improved the crystal quality for X-ray diffraction e…
This article describes new methods for X-ray crystallographic refinement and nuclear magnetic resonance (NMR) structure determination that are available in the recent release of the X-PLOR software, X-PLOR 98.0. The major new features of the X-PLOR 98.0 software are: (i) the introduction of maximum likelihood methods…
Silsesquioxanes having 1-(2-methoxy-1-benzothiophen-3-yl)-2-[5-(4-butylphenyl)-2, 4-dimethylthiophen-3-yl]perfluorocyclopentenes as the pendant groups were synthesized. Photochemical conversion from the open-ring to the closed-ring forms of the dithienylethenes increases when the methyl group at 2-position of the benz…
An electrolytic gel coating on AISI 316L stainless steel sheets has been investigated. The coating was produced by reduction of a aqueous solution. Thermogravimetric and differential thermal analysis (TGA and DTA, respectively) of the as‐formed electrolytic gel coating were conducted between 298 and 1373 K. Three tran…
However, no theoretical analysis of the photodecomposition alignment mechanism has been carried out. The photochemical mechanism is different for photopolymerization and photodecomposition, but the origin of the photoalignment of the LC is a UV dichroic absorption of the alignment material molecules. Therefore, we app…
Hydrogen adsorbed on Ru/ZrO 2 was studied by FT-IR (Fourier transform infrared) spectroscopy. While the Ru−H (Ru−D) species was not observed, the H 2 O (D 2 O)-like species was formed by H 2 (D 2 ) introduction on ZrO 2 . The H 2 O (D 2 O)-like species was characterized by a band at around 1600 (1190) cm -1 due to the…
Multicomponent semiconducting oxide glasses like (80 V2O5–20 PbO)+xBaTiO3 (x=5–30 wt %) dispersed with nanocrystalline BaTiO3 have been prepared by a fast quenching technique. Results of microstructural study and transport properties (between 80 and 450 K) of these glasses and some glass ceramics have been reported in…
New hyperbranched organosilicon polymers have been prepared from 2-bromo-5-(trimethoxysilyl)thiophene. The intermediate alkoxy-substituted hyperbranched polymer is functionalized with Grignard reagents in situ, leading to the isolation of a series of air- and moisture-stable polymers. The polymers contain alternating…
Experimental solubilities are reported for anthracene dissolved in ternary l-propanol+ l-butanol+heptane, l-propanol+2-butanol+heptane, 2-propanol+l-butanol+heptane and 2-propanol+2-butanoI+heptane solvent mixtures at 25°C. Nineteen compositions were studied for each of the four solvent systems. Results of these measu…
The corrosion behavior of aluminum, a candidate material for the current collectors of the positive electrodes of lithium‐polymer batteries, in contact with a lithium polymer electrolyte was examined in both batteries and three‐electrode electrochemical cells. The results indicate aluminum is resistant to uniform corr…
Germanosilicate glasses are prepared by a sol–gel method and the ultraviolet (UV) photosensitivity of the glasses is investigated by optical absorption, electron spin resonance, and photoluminescence measurements. A KrF pulsed laser and a Hg lamp are used as UV light sources. The concentrations of intrinsic germanium-…
Milling of V 2 O 5 in a ball mill increased the surface area from 7 to a maximum of 32 m 2 /g. Simultaneously, XRD line broadening suggested a reduction of the microcrystallites. A color change during milling indicated oxygen loss, and Raman spectroscopy provided evidence for the formation of shear structures such as…
Acrylic, cotton, and wool 1 × 1 rib knitwear fabrics are subjected to up to fifty laundering cycles in a variety of washing and drying conditions. Tactile and mechanical properties of the new and washed fabrics are quantified using subjective and objective evaluation methods. Principal components analysis (PCA) identi…
Results are provided from molecular-dynamics (MD) simulations for a ${\mathrm{Ni}}_{0.5}{\mathrm{Zr}}_{0.5}$ model adapted to Hausleitner-Hafner interatomic potentials, including estimates for the formation energies of vacancies, interstitials, and antisite defects in the orthorhombic structure of the intermetallic co…
The isothermal crystallization of isotactic polypropylenes has been studied under static conditions and under shear flow. The shear was induced by displacement of a glass fibre in the molten polymer. An α-monoclinic crystalline phase was formed with a columnar organization at the surface of the glass fibre, which did…
The ligands 3-ethyl-4-methylpyridine (3-Et,4-Mepy) and azide coordinate to MnII forming an alternating chain with the formula [Mn(3-Et,4-Mepy)2(μ-N3)2]n. This compound crystallizes in the space group P–1. The compound consists of chains of octahedrally coordinated manganese atoms alternately bridged by double end-to-e…
Columnar discotic carboxylic esters of 2-hydroxy-3,6,7,10,11-penta(1-pentyloxy)triphenylene, characterized by a variety of functional groups, were prepared with the purpose of studying the effects of the substituents on the mesophase behaviour. Bulky substituents and polar substituents were found to destabilize the co…
Dialogues for the estimation of crystallite size, shape and lattice strain are designed and included in an X-ray powder diffraction (XRPD) program, named AXES . They implement peak fitting and Voigt analysis followed by a Williamson–Hall plot (WHP). Eight different peak-shape functions can be used for individual peak…
Acrylic monomers and polymers have been intercalated in the lamellar structure of an iron substituted nickel layered double hydroxide (LDH) (Ni:Fe=7:3). The synthesis consists of an original step-by-step soft chemistry preparation route in which the formation of the Ni0.7 Fe0.3O2 slabs is dissociated from intercalatio…
A new Monte-Carlo program for simulation of low energy electron scattering in solids is presented. Applications to electron microscopy and electron microprobe analysis are discussed. Elastic interactions are described by Mott cross sections within the framework of partial wave analysis (PWA) whereas the inelastic coll…