Materials Literature
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A successful approach in molecular design through fusing aromatic/heterocyclic rings for broadening the smectic C (SmC) phase and the synthesis of the first heterocyclic liquid crystalline (LC) molecules containing 3,7-disubstituted quinoline with one of the widest SmC phases are reported. Their naphthalene analogues…
A simple molecular-statistical model of the smectic-A--smectic-C phase transition is proposed. Assuming a bilinear mean-field potential, the macroscopic tilt angle is calculated by Boltzmann statistics as a thermal average of the molecular tilt. The calculation leads to an equation of state for the smectic-C phase whi…
Two series of new, wholly aromatic copolyesters were prepared from 6-hydroxy-5-phenyl-2-naphthoic acid (HPNA) or 4‘-hydroxy-3‘-phenyl-biphenyl-4-carboxylic acid (HPBA) and 4-hydroxybenzoic acid (HBA) in varying mole ratios. In addition to these copolyesters, the homopolyesters of 6-hydroxy-5-phenyl-2-naphthoic acid an…
Langmuir monolayers are modeled as systems of short chains, which are confined to a planar surface at one end, but free to move within the plane. The phase behavior is calculated in a mean field approximation, which combines the self consistent field method with elements of classical density functional theory. It is s…
The influence of TiO 2 additives on the sintering behavior of In 2 O 3 ceramics has been investigated. TiO 2 increases the densification rate, decreases the grain growth during the intermediate stage of sintering, and hinders the pore/boundary breakaway that can affect the final stage of sintering. For a given grain s…
Abstract Diffusion enforced photo‐assembling during polymerization of a chiralnematic monomer blend yields a cholesteric network in which the helical pitch gradually changes over the cross‐section of the film. The polarization selective reflection band of cholesterics can be made much wider than those of single pitch…
The protein apocrustacyanin C(1) has been crystallized by vapour diffusion in both microgravity (the NASA space shuttle USML-2 mission) and on the ground. Rocking width measurements were made on the crystals at the ESRF Swiss-Norwegian beamline using a high-resolution psi-circle diffractometer from the University of K…
Introduction and synopsis The word ‘cell’ derives from the Latin cella: a small compartment, an enclosed space. Our interest is in clusters of cells – to the Romans, cellarium, to us (less elegantly) cellular solids. By this we mean an assembly of cells with solid edges or faces, packed together so that they fill spac…
Summary To handle ever-increasing oily water volumes and to improve water quality discharge, separation equipment should be developed to meet industry demand and match environmental regulations. However, special constraints such as size, simplicity of operation, variable fluids, different operating conditions, and eco…
In this paper experimental data on the solid−liquid and solid−solid equilibria in the binary system (docosane + tetracosane) and solid solubility data in the ternary system (heptane + docosane + tetracosane) are presented. For 14 binary mixtures of the two heavy alkanes, DSC measurements were performed to detect the s…
A range of exchange-coupled two-phase nanocomposites composed of hard magnetic Sm2Fe17N3 and soft magnetic α-Fe was prepared by mechanical alloying with a view to optimizing the hysteresis loop shape. The main variables were the crystallization conditions, the nitriding treatment, and the chemical additives. A model o…
Abstract Blown film properties depend on the thermo-mechanical history experienced by molten polymer during biaxial deformation. In this study on-line birefringence measurements along the length of the bubble in film blowing of a linear low density polyethylene (LLDPE) were carried out in order to assess the stress le…
Abstract Irradiation of either o-hydroxphenyldiazomethane or benzofuranone in argon matrix at 10 K generates benzoxetene which is in photoequilibrium with o-quinone methide.
A study was carried out to detect partial discharge signals generated in a gas-insulated substation (GIS) subjected to an insulation spacer method (internal electrode method), and to determine whether or not partial discharges were generated and then locate them with a pattern recognition method using a neural network…
The Cu 2P 3/2 photoelectron spectra were acquired to study the coordination state and oxidation state of Cu in ZSM-5 in the NO reduction by propene in the presence of excess oxygen. Two peaks at higher binding energy (937 eV) and lower binding energy (934.3 eV) were found to be changed in intensity depending on the tr…
The use of ammonium nitrate as an oxidizing agent in hydrothermal oxidation of organic compounds was investigated. The oxidation of model compounds, methanol, acetic acid, and phenol, was studied at 500 °C and 345 bar. High organic, ammonia, and nitrate removal was achieved at stoichiometric concentrations. The oxidat…
NPT Monte Carlo simulations of racemic mixtures were performed on a simplified model for the enantiomers. The molecules were spheres of equal size, interacting via a modified LennardJones potential. The interaction strength and the optimum distance between heterochiral molecules (D and L) differed (by a factor e and a…
The reflectance spectra of the superionic glasses x CuI·(1 − x )Cu 2 MoO 4 ( x = 0.4, 0.5) have been measured in the mid- and far-infrared range to investigate the structure of the oxyanion matrix and the nature of sites hosting the charge carrier copper ions. The analysis of the mid-infrared spectra revealed the pres…
In the Pantocsek Collection, slides with material from tertiary deposits include some cyclotelloid species belonging to the family Thalassiosiraceae. They are distinguished from other genera in the family by a combination of characters, some of them present in either Stephanodiscus, Cyclostephanos, Cyclotella or Plioc…
New multicomponent InF3-based bulk glasses have been investigated. The molar composition of the base glass is 28% InF3–20% ZnF2–16.5% BaF2–12% GaF3–9% PbF2–6% NaCl–5% SrF2–3% CaF2–0.5% PrF3. A number of variations of the base glass were prepared and their refractive indices and densities measured. Resistance to crysta…