Materials Literature
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The influence of the chemical composition of polymers on their modification in argon or oxygen RF plasmas has been studied. Hexatria-contane (C36), octadecyloctadecanoate (OOD), and octadecyloctadecanamide (OAD) have been chosen as model compounds of the following polymers: high density polyethylene (HDPE), polycaprol…
Adsorption of polymers on mineral surfaces allowing colloidal stability have widespread applications in industrial processes. The binding mechanism has been quite well described on oxide surfaces. Mainly in terms of hydrogen bonds and electrostatic interactions between charged sites and polymer segments. This phenomen…
Summary The amounts of aluminium liberated from a proto‐imogolite (P‐I) sol by 1–3 mM oxalate at pH 4·8–7·1 are found to be in excellent agreement with those calculated on the basis of the solubility product of the P‐I sol, and the stability constants for aluminium oxalate complexes established earlier. Calculated sol…
The low temperature sintering of Ni-Zn-Cu ferrite has been investigated by usual ceramic technique. The sintering density and the permeability of the sintered ferrite were strongly affected by the size of the starting oxide powders and the pre-sintering temperature. It was most effective to utilize fine particles of i…
We study the diamond-to-\ensuremath{\mathrm{B}}-Sn structural phase transition in Si under hydrostatic and uniaxial compressions using an invariant-molecular-dynamics approach based on an empirical potential model. Isobaric molecular-dynamics simulations show that the diamond-cubic lattice under hydrostatic compressio…
Appropriate Rochow contact masses have been investigated by the spatial resolution techniques SEM–EDX and SAM–AES. The results gave evidence of the existence and the catalytic action of (X-ray)-amorphous copper–silicon (Cu–Si) surface species, i.e. extremely highly dispersed particles or two-dimensional species. The w…
We show that a theory that neglects dynamic correlation in ion-atom collisions (the frozen correlation approximation, FCA) is able to provide accurate multiple-excitation cross sections from one-electron amplitudes. Important requirements for the success of the FCA are (i) inclusion of correlation in both the initial…
This paper overviews recent improvements in the properties of ferrite magnets from two viewpoints. First, new processes for submicron-sized particles, for high orientation and for high density were studied in detail. As a result, high performance Sr-ferrite magnets with Br=0.44T (4.4kG) and HcJ=320kA/m (4.0kOe) were d…
The Raman spectra of the three phases of the perovskite ${\mathrm{RbCaF}}_{3}$ have been recorded. A detailed group-theoretical analysis together with a rigid-ion model calculation in the cubic symmetry have been carried out in order to identify the observed peaks. The established compatibility relations demonstrate t…
Moldable poly(dimethylsiloxane) formulations are described which use so-called MQ resins as reinforcing fillers. These formulations employ platinum-catalyzed hydrosilylation as the cure reaction. The platinum catalysts were prepared by spray-drying solutions composed of vinyl-containing MQ resins with platinum(0) comp…
Abstract Reaction calorimetry has found widespread acceptance as a valuable tool that provides a combination of thermal hazard and process data for batch‐type reactors. There have been many significant advances in this type of instrument over the last few years, which include both improvements in methodology and the a…
The polymerizability of 4-vinylazobenzene; (VAB), a vinyl monomer containing an azobenzene chromophore directly attached to the polymerizable double bond, was investigated in the presence of radical, anionic, cationic, and Ziegler−Natta type catalysts. The homo- and copolymerization of VAB with (−)-menthyl methacrylat…
Abstract Predicting P sorption by weathered soils in order to manage soil, crop, and natural resources has been an important but elusive goal of soil science for decades. This study evaluated several soil properties, including mineralogy, of weathered Hawaiian soils in terms of their utility as predictors of P sorptio…
VMSW (variable magnetization and Stoner Wohlfarth model) method is effective for numerical analysis of anisotropic permanent magnets. This method however, has a serious restriction of the way of dividing elements. Therefore, the conventional VMSW method cannot be applied to the analysis of materials of complicated sha…
The deformation behavior of a range of polyethylene materials which differ with respect to both their short-chain branch content and molecular weight has been studied. Mechanical measurements carried out over a wide range of temperatures have shown that there is a sudden transition in the measured tensile yield strain…
In this paper, we prove that solutions of the anisotropic Allen--Cahn equation in double-obstacle form with kinetic term \begin{displaymath} \varepsilon \beta(\nabla \varphi) \partial_t \varphi - \varepsilon \nabla A'(\nabla \varphi) - \frac{1}{\varepsilon} \varphi = \frac{\pi}{4} u \quad \mbox{ in } [|\varphi| < 1],…
Abstract Base catalized intermolecular cyclization of 2‐amino‐3‐chloro‐5,6‐dicyanopyrazines gave 5,10‐disubsti‐tuted‐2,3,7,8‐tetracyano‐5,10‐dihydrodipyrazino[2,3‐ b :2′,3′‐c]pyrazines 11–20. These compounds have rather small molecular size but have strong intramolecular charge‐transfer chromophoric system. They have…
Cu lines 0.25 μm wide are successfully patterned by high-temperature dry etching without sidewall protection of the deposited films. Use of Cl2 gas as a single reactant rather than a mixture of gaseous chlorine compounds is the key to this anisotropic etching. This reactant suppresses the side etching of Cu patterns w…
The growth and morphology of crystals of hard colloidal spheres is monitored by a special photographic technique. Crystals are observed to grow in size and increase in number density, initially. This is followed by a decrease in size and an increase to saturation in the number density. During the growth stage the crys…
BEDT-TTF is the donor of the highest T c organic superconductors. Isotopic shift experiments support an electron−phonon coupling mechanism for the superconductivity. However, the vibrational levels have been only partially observed and assigned, making testing of this mechanism difficult. In order to provide a complet…