Materials Literature
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Abstract Some new heterocyclic liquid‐crystalline compounds incorporating a 1,3‐disubstituted allene unit were synthesised. These axial‐chiral compounds were investigated by polarisation microscopy and differential scanning calorimetry. One of them was also synthesised in enantiomerically enriched form by enantioselec…
The United States generates the largest amount of solid waste per person in the world. The old practice of direct landfilling and storage is receiving greater public resistance and is attributing to the search for alternative disposal methods. The evergrowing problem of solid wastes requires environmentally benign and…
Abstract This paper is a contribution to development of electron beam profilography based on the so called “shape from shading” technique. A new formula of signal processing in a two detector system has been proposed. The formula en be applied to all the signals showing Lambert's angular distribution. The signal proce…
Abstract We have discovered that the impact strength of polystyrene is increased by the addition of rigid particles several microns in diameter and at concentrations of 0.01 ∼ 1 wt%. As examples, we used barium sulfate particles and crosslinked polystyrene beads. From the observation of real‐time deformation of polyst…
Abstract This paper demonstrates how ultrafine talc can be used in a rigid PVC formulation to design a compound with increased stiffness and high impact strength. The talc's shape and particle size, combined with the affects of increased levels of impact modifier, produce a PVC material with an outstanding impact stif…
The structure and properties of a polypropylene microporous film prepared by biaxial stretching of non-porous polypropylene film of high β-crystal content were investigated. The porosity of these films can be as high as 30–40%, and the average pore size was around 0.05 μm. The films were found to have the structure of…
Nanocrystalline element selenium (nc-Se) samples were synthesized by completely crystallizing a meltquenched amorphous selenium ($a$-Se). Heat capacities (${C}_{p}$) of the nc-Se (with a mean crystallite size of 10 nm), a fully relaxed $a$-Se, and a coarse-grained polycrystalline Se were experimentally determined in a…
Wool and nylon 6 fibres treated with oxygen low‐temperature plasma were dyed with acid and basic dyes. Despite the increase of electronegativity of the fibre surface caused by the plasma treatment, the rate of dyeing of wool was increased with both dyes, while that of nylon 6 was decreased with the acid dye and increa…
Thin films of Cs2Te have been produced and analyzed by Auger depth profiling and x-ray photoemission spectroscopy (XPS). The formation of the photoemissive material passes through different phases, each of them has been characterized by XPS and by its total yield in the spectral region 3.5–5 eV. Copper and molybdenum…
The tetragonal form of hen egg-white lysozyme is the most investigated protein crystal for growth studies, but the relationship between its surface morphology and internal structure is still not well understood. One method of determining this relationship for inorganic crystals is by employing the periodic bond chain…
Abstract R‐RIM PU (reinforced‐reaction injection molding polyurethanes) from the automotive industry (production scrap and parts at the end of their life cycle) can be recycled for the production of new RIM PU by a chemical process. Among the various possible chemical processes (hydrolysis, alcoholysis, aminolysis, an…
Metal dithiocarbamate complexes are also potential candidates for the CVD of metal sulfides (see previous article). This paper reports on an investigation by mass fragmentation initiated by electron impact of the vapor phase decomposition of a copper complex in order to clarify the decomposition route and to assess it…
The phonon dispersion of the high-temperature fcc phase of pure cobalt has been measured by inelastic neutron scattering at 833 K. Transverse phonon branches were measured above and below the Martensitic hcp-fcc transformation in order to learn about an influence of lattice dynamics, if any. No new anomalies could be…
Abstract A few (alkoxo)(subphthalocyaninato)boron(III) complexes, [BX(subpc)] (X = OMe, OEt, OBut, and OPh), were prepared and characterized. The molecular structure of [B(OEt)(subpc)] was determined by an X-ray structure analysis; the boron atom is situated 0.642 Å upward from the triangle plane of three isoindoline…
The transition to an antiferroelectric or ferroelectric phase in the lamellar compound CuMP2S6 (M= Cr or In) is shown to be triggered by the appearance of an ordered copper sublattice. Cu(I) ions in CuCrP2S6, which are distributed over several sites at room temperature, freeze into an intermediate quasi-antipolar stat…
Deposition of seven bacterial strains on spherical glass and Teflon collectors was studied in vertical down-flow columns at an ionic strength ( I ) of 0.1 M. The various bacteria had either one of the following types of major cell−surface constituents: nonpolysac charide (NP), amphiphilic (AMPH), or anionic polysaccha…
Aluminum titanate thin films were prepared by ion beam induced chemical vapor deposition (IBICVD). By this method it is possible to control the Al/Ti ratio in the film. Films with Al/Ti≂2 (i.e., a ratio similar to Al2TiO5) were characterized by scanning electron microscopy and transmission electron microscopy, x-ray p…
This paper presents a simple particle plus field model for the dynamics of disclination lines in a nematic liquid crystal. The model has no logarithmic divergences with system size and, therefore, no need to introduce a cutoff. The resulting equation of motion relates the velocity of the disclination to the local phas…
Electron-paramagnetic-resonance (EPR) studies in electron-irradiated diamond enriched with 5% $^{13}\mathrm{C}$ have resulted in identification of the di-〈001〉-split interstitial center. It is the isotopic enrichment and the consequent observation of $^{13}\mathrm{C}$ hyperfine satellites that have permitted the struc…
The characteristic feature of liquid crystal dimers, in which two mesogenic groups are linked by a flexible spacer, is often thought to be the strong odd-even effect exhibited by their transitional properties. That is, the nematic-isotropic transition temperature and the entropy of transition are large for dimers with…