Materials Literature
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Icosahedral Al71Pd21,Mn8 quasicrystals have been grown from the ternary melt via a ‘self-flux’ technique. The nucleation is exceptionally well controlled, and individual grains can have masses of up to almost 30 g (limited only by the dimensions of the growth crucible). The quasicrystals grown by this technique are re…
For the binary Ti–Al system, an ordering transformation in Ti3Al has been shown to result in a significant lowering of the electronic heat-capacity coefficient, γ, by removing electrons from conducting states. When γ is normalized to a per Ti atom basis, the same tendency is found in low temperature calorimetric studi…
The complex refractive index of a LiF crystal surface layer irradiated by low-energy electrons is modified by the stable formation of color centers embedded in it. A simplified dipole-electromagnetic field interaction model has been adopted in order to estimate the dispersion curves of colored LiF from a single optica…
Ruthenium (Ru) films were deposited by liquid source chemical vapor deposition using bis-(ethylcyclopentadienyl)ruthenium (Ru(C 2 H 5 C 5 H 4 ) 2 ). The crystalline structure, resistivity and residual impurities in the Ru films were investigated. The Ru films were polycrystalline and had a columnar structure; they sho…
Flax that has been mechanically treated in an opener-blender to disrupt stem integrity is enzymatically retted with a series of enzyme formulations with different levels of Flaxzyme with or without ethylenediamine-tetra-acetic acid (EDTA) as a chelator. Samples are then characterized by light and transmission electron…
Aqueous suspensions of V 2 O 5 ribbons form a lyotropic nematic phase at volume fractions larger than 0.7%. We investigate the effect of adding a monovalent salt (NaCl) to this charge-stabilized system. Without any added salt, the nematic ordering can be described by the Onsager model based on a hard-core repulsive po…
We have synthesized four different types of dimesogenic compounds involving the cholesteryl moiety as one of the mesogenic constituents, and have investigated their liquid crystalline properties. The molecular structures of these dimesogens have been confirmed by spectral analyses; they exhibit a rich polymorphism, as…
Dislocation density studies have been performed on icosahedral Al-Pd-Mn single quasicrystals after plastic deformation and after subsequent heat treatment. The deformation tests were carried out at a constant strain rate of 10- 5 s-1 at temperatures between 695 and 820 C. The heat treatments were performed at 730 C, c…
A method is described that permits the cooling of protein crystals without the use of conventional cryoprotective agents. Covering the crystal completely with highly liquid dry paraffin oil (Merck) prevents ice formation. It is suggested that this method, because of its simplicity, be tried as a first choice in cryocr…
CN x films were deposited on Si(100) substrates at a substrate temperature of 600 °C using dc magnetron sputtering of a high-purity graphite target in pure nitrogen. The film characteristics were primarily controlled by the pressure, p, (0.05–5 Pa), the discharge current on the magnetron target, Im, (0.5–3 A), and the…
Brownian dynamics simulations of aggregation of hard-sphere dispersions at intermediate volume fractions (∼3–10 vol%) have been performed. A long-range activation energy for aggregation was incorporated. The bonds formed were irreversible and flexible. Cluster growth rate and fractal properties of the gel matrix could…
A detailed immunocytochemical and biochemical study of the location and expression of frustulins, a family of proteins associated with the frustules of diatoms, has been performed for Cylindrotheca fusiformis Reimann et Lewin, Navicula pelliculosa (Brébisson et Kützing) Hilse, and Navicula salinarum (Grunow) Husted. I…
Abstract The helical structure was introduced into the silica for the first time utilizing a template effect of a cholesterol-based organogel system. It was shown that the cationic charge dilutely distributed in the organogel fibers plays an essential role.
The 1,2-bis-(3-thienyl)-ethene derivatives are known to be good photoswitches. A large number of experiments have been carried out on different classes of these molecules to find out the most effective photoswitch. We have selected several highly efficient representative model photoswitch molecules of this class and s…
A diarylethene derivative, 1,2-bis(5-(4- tert -butylphenyl)-2,4-dimethylthiophen-3-yl)- 3,3,4,4,5,5-hexafluorocyclopentene, forms stable amorphous solid with T g of 68°C. Reversible photochromism in the amorphous solid film is observed upon alternate irradiation with UV ( e.g. 313 nm) light and visible (580 nm) light.…
The nature of the Ti(IV) active site in heterogeneous titano−silica epoxidation catalysts is shown to be same as that of a Ti(IV)-centered site bound to soluble homogeneous silsesquioxane catalysts. A range of techniques, encompassing pre- and near-edge X-ray absorption spectroscopy and molecular dynamics calculations…
Bone morphogenetic proteins (BMPs) are biologically active molecules capable of eliciting new bone formation. In combination with biomaterials, these proteins can be used in a clinical setting as bone-graft substitutes to promote bone repair. To find new synthetic absorbable polymers with plastic nature that can be us…
The role of the potential energy landscape in determining the relaxation dynamics of model clusters is studied using a master equation. Two types of energy landscape are examined: a single funnel, as exemplified by 13-atom Morse clusters, and the double funnel landscape of the 38-atom Lennard-Jones cluster. Interwell…
Magnetic properties are systematically investigated for Cr-doped manganites ${R}_{1/2}{\mathrm{Ca}}_{1/2}(\mathrm{M}\mathrm{n},\mathrm{C}\mathrm{r}){\mathrm{O}}_{3}$ $(R=\mathrm{La},$ Nd, Sm, and Eu) with variation of the averaged ionic radius ${r}_{R}$ of the rare-earth ion, or the one-electron bandwidth W. Cr-doping…
Current-voltage and voltage-time characteristics of Al were studied in common contemporary Li battery electrolytes. Enhanced E AI +3 / A] electrolytes, including (C 2 H 5 ) 4 NC1 (TEAC) or A1C1 3 in several solutions of -butyrolactone (BLA) and acetonitrile (ACN), such as TEAC/BLA, TEAC/ACN, and concentration optimize…