Materials Literature
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The p - e hysteresis loop near the morphotropic phase boundary in the perovskite-type oxide solid solution system is discussed on the basis of a Landau-type free energy function. It was found that the coercive field in the p - e hysteresis loop decreases upon approaching the morphotropic phase boundary and vanishes at…
Abstract Coarsening of the phase dimensions in polymer blends under quiescent conditions is studied in blends of different morphologies; the dependence of the rate and extent of coarsening on the initial morphology is demonstrated. In blends with a droplet/matrix structure, coarsening via coalescence is found only abo…
Crystalline ZnS films were prepared on glass substrates from a high‐crystallinity ZnS pellet using an ion‐plating method. The crystallinity and friction‐induced photon‐emitting capability (triboluminescence) of the films were greatly enhanced by postannealing under vacuum. The annealing treatment made the ZnS films st…
We present an analytical model describing the instability of the interface during anodization of p‐type resistive silicon in HF electrolyte, leading to porous silicon formation. Our analytical approximations are applicable to p‐type amorphous and crystalline silicon with resistivities in the range from about 0.1 to 10…
Four kinds of polyurethane/polyacrylate interpenetrating polymer networks (crosslinked polyacrylate semi-IPNs, crosslinked polyurethane semi-IPNs, all-IPNs and all-IPNs with opposite charge groups) were synthesized by a simultaneous polymerization process. Their damping properties, mechanical properties and multiphase…
Abstract The wide-line NMR and viscoelastic measurements were carried out for the filled rubber systems. NMR results revealed that the filler-gel in the filled rubber composites had a multi-component system depending on the mobility of rubber molecules. The fraction and the spin-spin relaxation time of each component…
Parascorodite, a new mineral from Kaňk near Kutná Hora, Central Bohemia, Czech Republic, forms earthy white to white-yellow aggregates associated with scorodite, pitticite, bukovskýite, Kaňkite, zýkaite, gypsum, and jarosite, wet chemical analysis gave (in wt%): As 2 O 5 44.45, P 2 O 5 0.84, SO 3 1.53, Fe 2 O 3 34.55,…
A new series of mesomorphic complexes formed through intermolecular hydrogen bonding between p-n-alkoxybenzoic acids (where alkoxy denotes chains from propoxy- to decyloxy- and dodecyloxy-) and non-mesogenic p-hydroxybutyl benzoate, have been synthesized and characterized by thermal microscopy, differential scanning c…
Using the quantum chemical methods ab initio (B3LYP/6-31 G(D)) and the semi-empirical MOPAC/AM1, the dipoles and their angle with the molecular long axis and the polarizabilities and their anisotropies, have been calculated for different conformers of 5CB. On the basis of these data the dielectric constants and refrac…
The structure and properties of vacancy loops (VIs) and stacking-fault tetrahedra (SFTs) in copper have been studied by computer simulation using a long-range pair interatomic potential (LRPP), obtained from the generalized pseudopotential theory, and a many-body potential (MBP) of Finnis-Sinclair type. The results ob…
UNLABELLED: Platelet adhesion on the cardiopulmonary bypass oxygenator membrane is associated with impaired hemostasis. We investigated the effects of heparin coating of the oxygenator membrane on protein adsorption and platelet adhesion on the surface. Noncoated and heparin-coated polypropylene membranes were incubat…
ABSTRACT: Polyethylene glycol‐plasticized films were cast from alkaline (pH 11.25), heated (45 °C for 20 min), aqueous egg white (EW) solutions, with or without (10% or 20% w/w of EW) milkfat (two fractions), oleic acid, or egg yolk lysophospho‐lipid (LPL). The lipids did not reduce (P > 0.05) film water vapor perm…
A viscoplastic self-consistent (VPSC) multiscale model for predicting the plastic behaviour of materials with lamellar microstructures is presented. In this approach, three different scales are defined: the microscopic, at single crystal (single lamella) scale; the mesoscopic, at the scale of a single lamellar colony…
The glass transition temperatures Tg of butyl acrylate–methyl methacrylate copolymers obtained by free radical polymerization in 3 and 5 mol/L benzene solution have been measured using differential scanning calorimetry (DSC) and the values have been correlated using Johnston's equation with inter-intramolecular copoly…
The polarized Raman spectra of La0.7Ca0.3MnO3 magnetoresistive thin films deposited on LaAlO3, SrTiO3, YSZ, and MgO substrates were studied in a broad temperature range including Tc. Depending on variations of their intensity and linewidth upon cooling, the Raman bands could be classified into two groups. The lines co…
Novel water-soluble polyesters with pendant carboxylic groups were synthesized by polycondensation of ethylenediaminetetra-acetic acid (EDTA) dianhydride and diethylenetriaminepenta-acetic acid (DTPA) dianhydride with poly(ethylene glycol)s of different chain-lengths. Two experimental approaches (polycondensation usin…
Abstract Polymers possess a very large inherent capacity for property modifications. The bridge between structure or morphology and mechanical properties is created by the micromechanical processes of deformation and fracture, the “micromechanics.” Developments mainly in electron microscopy (EM) (scanning, transmissio…
The light-induced reorientation of nematic liquid crystals is discussed with special emphasis on the effect of dye-dopants. A molecular model is presented which accounts for the large increase of the optical torque, observed in absorbing nematics. An analogous process is described for dye-doped isotropic liquids and t…
We investigate the formation of a two-dimensional quasicrystal in a monodisperse system, using molecular dynamics simulations of hard-sphere particles interacting via a two-dimensional square-well potential. We find that more than one stable crystalline phase can form for certain values of the square-well parameters.…
At the macroscopic scale two different phenomena illustrate the couplings between the elastic and magnetic behaviours of ferromagnetic materials: first, magnetisation induces a deformation mechanism called magnetostriction, and, second stresses have an effect on the magnetic behaviour. The complexity of the non-linear…