Materials Literature
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Bis(hexafluoroacetylacetonato)copper(II), Cu(hfac)2 (= M) reacts with 5-bromo-1,3-phenylenebis(N-tert-butylaminoxyl), 1 Br to yield a complex of formula [M 3·(1 Br)2]. The X-ray crystal structure shows that it crystallizes in the space group P2, with a = 12.469(2) Å, b = 15.278(2) Å, c= 11.602(2) Å, α = 104.59(1)°;, β…
The interaction of vacancy loops (VLs) and stacking-fault tetrahedra (SFTs) with point defects and the processes of growth and shrinkage of VLs and SFTs have been studied using computer simulation and a long-range pair potential for copper. It was found that there is a qualitative difference in the mechanism of growth…
The structure of several types of layered materials will be described. These include clays, layered double hydroxides, group IV metal phosphates and other layered materials. The preparation of the pillared materials and pillaring agents will be presented along with a description of the properties and applications of t…
The low energy electron reflectivity from a magnetic surface depends on the relative orientation between the electron spin and the sample magnetization. This effect has been exploited for realizing a new electron spin polarization detector. As a scattering surface we have used a well ordered Fe(001)-p(1×1)O surface, w…
Enthalpies of drop-solution (∆H drop-soln ) of a suite of stuffed quartz-derivative phases with the composition Li 1-x Al 1-x Si 1+x O4 (0 ≤ x ≤ 1) have been measured in molten 2PbO·B 2 O 3 at 974 K. Substitution of Si 4+ for Li + +Al 3+ results in more exothermic enthalpies of drop-solution, which is consistent with…
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…