Materials Literature
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Abstract Chemically pure lansfordite (MgCO 3 ·5H 2 O) and nesquehonite (MgCO 3 ·3H 2 O) were synthesized from CO 2 ‐saturated Mg(HCO 3 ) 2 solutions by degasation with air for varying periods of time depending upon equilibration temperature. Crystalline and chemical properties of the synthesized minerals were determin…
An acid DNase (DNase II) from porcine spleen was purified by sequential chromatography over carboxymethyl-cellulose, blue dextran-Sepharose, hydroxylapatite, and sulfoxyethyl-cellulose. The purified enzyme shows two polypeptide bands on sodium dodecyl sulfate-polyacrylamide gel electrophoresis at Mr 35,000 (alpha chai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of core/shell emulsion polymerizationDeborah R. Stutman, Andrew Klein, Mohamed S. El-Aasser, and John W. VanderhoffCite this: Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 3, 404–412Publication Date (Print):September 1, 1985Publication History Published online1 May 200…
Abstract Poly(vinyl alcohol) (PVA) gels were prepared by freezing and thawing aqueous solutions at temperatures from −20 to 15°C. The temperature was varied periodically by use of a computer. The endothermic DSC peak was observed for the PVA gels at about 60°C for five specimens of different degrees of saponification…
Cahn's general argument for complete wetting in the vicinity of critical points is critically reviewed. Critical-point wetting does occur in systems with short-range (exponentially decaying) forces. Whenever short-range forces favor wetting, while at the same time there is a tendency towards drying due to weak long-ra…
The photoluminescence (PL) and excitation spectra of various thermoluminescence dosimetry (TLD) phosphors were measured at temperatures of 6, 17, 80 and 300 K. Their PL spectra at 300 K consist of a single band in the vicinity of 380 nm. The emission bands and their excitation bands are ascribed to the electronic 4 f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward a unified view of the mechanism responsible for paint defects by metallic corrosionWerner FunkeCite this: Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 3, 343–347Publication Date (Print):September 1, 1985Publication History Published online1 May 2002Published inissue 1 Se…
ABSTRACT A nitrogen limitation technique elicited the entire life cycle of the marine centric diatoms Chaetoceros diadema (Ehr.) Gran and Leptocylindrus danicus Cleve. In C. diadema the sexual cycle followed the same pattern as in the previously investigated C. didymus. Sexuality took place in narrow diameter cells, o…
The RFe2alloys (R=Tb,Dy,Sm) offer opportunities for achieving very high magnetostrictions at temperatures far above room temperature. Saturation strains greater than 1000 ppm have been measured at temperatures as high as 200°C. In addition to saturation strain measurements, we have measured magnetostriction of Tb.27DY…
The dc conductivities (α) of PbO‐P 2 O 5 ‐V 2 O 5 glasses containing up to 80 mol% V 2 O 5 were measured at T = 100°C to T = 10°C below the glass transition temperature. Dielectric constants at 1 MHz, densities, and the fraction of reduced V ion were measured at room temperature. The conduction mechanism of glasses co…
ABSTRACT The axial retractive stresses that cause the supercontraction of wetted major ampullate silk fibres and the stresses developed upon reextension from the supercontracted condition are quantified and illustrated. The viscoelastic behaviour of major ampullate silk fibres, subjected to the amounts of elongation t…
Abstract The substitution of Fe for Co of La1−xSrxCoO3−δ makes it possible to preserve perovskite-type structure at higher Sr contents. While the amount of oxygen reversibly absorbed or desorbed was mostly determined by the Sr content, the Fe substitution was found to enhance the oxygen desorption particularly in a lo…
Three empirical equations introduced by Jonscher to represent the imaginary part of the small-signal frequency response of dielectric materials and termed ‘‘universal dielectric response’’ by him are generalized in three ways. The equations may be applied in normalized form at the impedance level as well as at the usu…
When the small-signal ac frequency response of a dielectric or conductive system is known, either functionally or as data, it is shown that the corresponding response of an associated conductive or dielectric system may be immediately obtained through the use of new duality relations. A specific model is considered wh…
Abstract Chemically modified electrodes are prepared by deposition of copper hexacyanoferrate (CuHCF) on glassy carbon. These electrodes are characterized by voltammetric and potentiometric measurements. After suitable conditioning they exhibit nearly Nernstian response to changes in activity of potassium or ammonium…
Abstract Previous work has shown that sorption of CO 2 at relatively high pressures by glassy polymers reduces their glass transition temperatures and may convert the glass into a rubber under certain conditions. It is shown here that this plasticization by a gas can induce crystallization just as sorption of vapors o…
Details of the optical-spectroscopic properties of alexandrite (${\mathrm{BeAl}}_{2}$${\mathrm{O}}_{4}$:${\mathrm{Cr}}^{3+}$) crystals were studied by different laser-spectroscopy techniques. The temperature dependences of the fluorescence lifetimes and widths of the zero-phonon lines were found to be quite different…
Ribonuclease A has been used as a model protein for studying the specificity of glycation of amino groups in protein under physiological conditions (phosphate buffer, pH 7.4, 37 degrees C). Incubation of RNase with glucose led to an enhanced rate of inactivation of the enzyme relative to the rate of modification of ly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic photochemical dehydrogenation of organic substrates by polyoxometalatesCraig L. Hill and Donald A. BouchardCite this: J. Am. Chem. Soc. 1985, 107, 18, 5148–5157Publication Date (Print):September 1, 1985Publication History Published online1 May 2002Published inissue…
Abstract The microdomain structure of a series of segmented polyurethane block copolymers is characterized by small‐angle x‐ray and neutron scattering analyses. The materials contain hard segments formed from 4,4′‐ diphenylmethane diisocyanate (MDI) and butanediol (BD), and range in hard‐segment content from 20 to 80%…