Materials Literature
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We report on a study of mixtures of octylcyanobiphenyl (8CB) and equal amounts of two chiral agents (CE2 and CB15) as a function of chiral pitch (concentration). Bulk studies reveal a widening cholesteric temperature range with increasing chirality. The first order cholesteric-isotropic (Ch-I) transition shifts margin…
Diffuse reflectance infrared spectroscopy and static secondary ion mass spectrometry (SIMS) were employed to study the surface species formed during the adsorption and reaction of propylene on a copper-exchanged ZSM-5 catalyst. Propylene showed characteristics of chemisorption on Cu-ZSM-5 at room temperature and total…
A new effect of illumination on ionic conductivity and activation energy of migration of mobile Ag + cations in RbAg 4 I 5 superionic crystals has been detected and studied. Reversible changes in the ionic conductivity due to illumination of superionic crystals are caused by reversible changes in the structure of elec…
We propose a model describing the destruction of metals under ultrashort intense laser pulses when heated electrons affect the lattice through the direct electron-phonon interaction. The metal consists of hot electrons and a cool lattice. The lattice deformation is estimated immediately after the laser pulse up to the…
Abstract A new family of main‐chain liquid crystal polymers containing azomethine units have been synthesized and characterized. Our attention has been focused on their strong tendency to generate macrocyclic dimers (AB) 2 constituted with two mesogenic rods and siloxane spacers. In favourable conditions (diluted solu…
The racemic mixture of cholesteryl chloride(ChCI) and cholesteryl myristate(ChMy) exhibit a compensated nematic phase at critical concentration and temperature. The mixtures of concentration from 1 to 10% ChCl and 88% to 100% of ChCl exhibit smectic phase and cholesteric phase respectively. The middle concentrations a…
The data on the dynamic (spall) strength for more than 30 steels are reported. These data were interpreted in terms of the fracture mechanics. The experimental data are interpreted in terms of the energy-based spall theory which predicts the dependence of the spall strength on the strain rate in the spall plane. Even…
The stabilization of the LaNi 5 H 6 hydride was performed by poisoning the surface with CO or SO 2, in gaseous or liquid phase. The enhancement of the retention time of hydrogen in the hydride was confirmed for the SO 2 treatment, if employed in a liquid phase, compared to the performance of the CO surface treatment.…
Abstract The understanding of damage initiation and evolution mechanisms is essential to model projectile penetration into ceramics. Two original test configurations have been developed to visualize, in real time, the initiation and propagation of damage. Results obtained are adaptable to a more conventional a m o u r…
Porous Silicon was formed on mono- and poly-crystalline Si substrates by stain etching in aqueous HF/HNO3 solutions. Optical properties of the resulting films have been investigated by reflectance spectroscopy and have been related to process parameters, e.g. HF, HNO3 concentration and etching time. Film morphology ha…
A poly(vinyl alcohol)−alumina hydrate composite film prepared by using a sol−gel process was transparent in the visible region. The composite film was insoluble in water after being heated at about 100 °C but exhibited hydrophilicity. These characteristics are suitable for the deposition of Fe 2 O 3 · n H 2 O in the f…
We report in this paper the first theoretical treatment of kinetic and equilibrium chemical processes of the atmospheric corrosion of nickel performed with the multiregime GILDES model. The formulation for exposure of nickel to sulfur dioxide in humidified air involves 67 reactions for 35 species and includes a repres…
Conference Article| August 01 1997 PRINCIPLES OF PROTEIN STRUCTURE Clare Sansom; Clare Sansom 1Department of Crystallography, Birkbeck College, Malet St., London WC1E 7HX +44 (171) 631-68002Venus Internet Ltd., 24 Denmark St. London WC2H 8NJ +44 (171) 240 5858 Search for other works by this author on: This Site PubMed…
Article Solubility of calcium oxalate in the presence of magnesium ions, and solubility of magnesium oxalate in sodium chloride medium was published on December 1, 1999 in the journal Nordic Pulp & Paper Research Journal (volume 14, issue 4).
The switching effect in CuIr2S4—xSex was studied and associated with the metal–insulator phase transition in this compound. The most probable mechanism of the switching process in CuIr2S4—xSex is the electrothermal effect.
Abstract. The possibility of diamond synthesis in gray iron is addressed for cases of plastic deformation preceding or thermal cycling following the shock wave loading of the iron samples. The physical properties of diamond single crystals thus synthesized are found to be similar to those of natural diamond. R4sum6. L…
We discuss how strongly the thermoelectric figure of merit Z is influenced by carriers in a particular energy range. From the knowledge of the energy dependence of the functional derivative of Z with respect to differential conductivity, it is shown that the carriers in the low and high energy range have a harmful eff…
The influence of different parts of the interaction potential on the microscopic behavior of simple liquid metals is investigated by molecular dynamics simulation. The role of the soft-core repulsive, short-range attractive, and long-range oscillatory forces on the properties of liquid lithium close to the triple poin…
Raman spectra of some A 3 B 2 C 9 ferroelectric crystals (here A=Cs, Rb; B=Sb, Bi; C=Br) have been obtained, and a number of high-frequency bands have been assigned. The Rb 3 Bi 2 Br 9 and Rb 3 Sb 2 Br 9 crystals are shown to differ in structure from Cs 2 Bi 2 Br 9 . The qualitative changes in the spectra in the 77–30…
The desorption of surfactant may be a problem in the development of admicellar catalysis for organic synthesis or for wastewater cleanup. The formation of hydrocarbon aggregates chemically bonded to mineral oxide surfaces has been investigated to solve this problem. In this study, octadecyltrichlorosilane (ODS) was ch…