Materials Literature
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Brushes of grafted polystyrene have been studied using the classical small-angle neutron scattering techniques. The results show unambigously that the interface, in good solvent, has essentially a parabolic shape, with a small exponential tail. Furthermore, the local structure is similar to that of a semidulute polyme…
Abstract Bombyx mori silk fibers were chemically modified by acylation with aromatic acid anhydrides, such as phthalic and o ‐sulfobenzoic anhydrides. We examined the reactivity of these modifying agents toward silk fibers, the physical and thermal properties, and the dyeing behavior with acid and cationic dyes. The o…
Abstract The effect of quiescent annealing for brief periods at melt‐processing temperatures (e.g., 270°C) were designed to simulate certain conditions that can occur during molding or extrusion. It was found that significant changes in the phase morphology of polycarbonate‐based blends can occur in less than 2 min un…
Diamond is known as a unique materiaI possessing a number ofoutstanding Properties1) Many laboratories have been active on diamond research since Deaguin e Z2)reported on diamond growth by chemical vapour deposition (CVD)methodDiamond films grown by this method in the presence of boron have p-type semiconducting Prope…
Abstract X‐ray photoelectron spectroscopy (XPS) is used to compare the surface behavior in various binary systems of poly(dimethylsiloxane) with poly(bisphenol A sulfone) and poly(bisphenol A carbonate). All the systems studied show a pronounced surface enrichment in siloxane. At a fixed siloxane concentration in the…
Abstract In this article we studied the potential of ethylene vinyl acetate copolymer (EVA) as an impact modifier for isotactic polypropylene (PP). PP/EVA blend in the range 0–40 wt % EVA content is studied by using three grades of EVA containing 9, 12, and 19 wt % VA. Izod impact strength measurements were made at te…
Abstract The theory for the calculation of the frequency‐dependent hyperpolarizabilities β(−2ω; 0, ω), β(−ω; 0, ω), and β(0; ω, −ω) is discussed. New relations between these tensors are derived for those wave functions that obey the time‐dependent Hellmann–Feynman theorem (e.g., the self‐consistent field [SCF] or the…
Abstract A simplified three‐level model for γ, the molecular third‐order nonlinear optical susceptibility, is presented and discussed. The perturbation theory‐based approach suggests that there are three primary avenues to optimizing molecular four‐wave mixing susceptibilities and that with each of these is associated…
Abstract Effects of particle size on the mechanical and impact properties of cured epoxy resins are studied. This resin was filled with spherical silica particles prepared by hydrolysis of silicon tetrachloride. Particles were sorted into five kinds of different mean sizes in the range from 6–42 μm. A static flexural…
We report a case of acute renal failure secondary to ingestion of ecstasy (methylenedioxymethamphetamine, MDMA).
Treatment of anodized or chemically etched silicon ("porous silicon") with dilute nitric acid or persulfate solution results in weak chemiluminescence in the visible region. Concentrated nitric acid reacts violently with porous Si produced by anodization with a bright flash of light. The fact that similar reactions oc…
The complex refractive index at 60 GHz of soda-lime glass, which is commonly used as window glass, has been measured by means of a free-space reflection method using a vector-network-analyser-based scatterometer. The complex refractive index was estimated to be 2.61 – 0.0318j, which is consistent with previously-repor…
The first fibre laser operating above 3 μm at room temperature is reported. An Er3+-doped ZBLAN fibre pumped at 655 nm shows CW laser operation around 3.5 μm.
Article Zur kristallchemischen Einordnung von NaSbCl6, NaNbCl6« und NaTaCl6 was published on July 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 198, issue 1-4).
Abstract Polyarylates containing pendant silyl group were prepared by the phase‐transfer catalyzed, two‐phase polycondensations of 2,2‐bis (4‐hydroxyphenyl) propane with corresponding dicarbonyl chlorides such as 2‐trimethylsilylterephthaloyl chloride, 5‐trimethylsilylisophthaloyl chloride, 5‐dimethylphenylsilylisopht…
We report an observation of a smectic-A--smectic-C--smectic-F (A-C-F) meeting point in a binary liquid-crystalline system. Detailed high-precision x-ray measurements enabled us to characterize the meeting point as a triple point, a point at which the three phases coexist. A direct consequence of this result is the exi…
Peer Reviewed
II–VI materials are important for optoelectronic devices. These devices are currently wet etched and due to the isotropic nature of wet etching, their etch geometries are limited. Reactive ion etching (RIE), a dry etch process, is a more desirable alternative, because it offers a means of producing small anisotropic s…
Substrate-free a-SiO2 films, 480 Å in thickness, have been made by means of electron beam evaporation. Electron diffraction patterns, taken under the condition that the incident beam is normal to the films, are all centre-symmetric, while their intensity features vary considerably with the film thickness. Since a film…
Electrical resistance measurements have been performed on ZrS2, ZrSe2, and ZrSSe single crystals grown by Iodine vapour transport technique in the pressure range 10 kilobar to 80 kilobar (1 GPa-8GPa). It is observed that all these crystals show a decrease in resistance with increase in pressure. The results have been…