Materials Literature
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Abstract Surface acidity of almost homoionic montmorillonites was measured by titrating selected Hammett indicators adsorbed on the clay with n -butylamine. As expected, the acidity is strongly affected by the exchangeable cations and the degree of hydration of the clay. Greater polarizing ability of the interlayer ca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and activity of optically active disparlureShigeru Iwaki, Shingo Marumo, Tetsuo Saito, Minoru Yamada, and Kazumasa KatagiriCite this: J. Am. Chem. Soc. 1974, 96, 25, 7842–7844Publication Date (Print):December 1, 1974Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of 12-Molybdophosphoric and 12-Molybdosilicic Acids and Their Metal SaltsGeorge A. TsigdinosCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 4, 267–274Publication Date (Print):December 1, 1974Publication History Published online1 May 2002…
We have computer simulated the structure of thin amorphous films grown from a vapor. Our hard-sphere model shows that structural anisotropy and voids are a natural occurrence of the deposition process. The amount of unfilled space (voids) and the anisotropy have been studied as a function of the angle of incidence of…
The spectral behaviour of the reflected and transmitted light from a dielectric multilayer film at an oblique angle of incidence is discussed. These spectra are different for both states of polarizations p and s even when the incoming light is unpolarized. The difference between both spectra of the two states of polar…
Abstract This paper reviews a series of high‐melting thermoplastic polyether esters prepared by transesterification from dimethyl terephthalate, polytetramethylene ether glycol (MW 600–2000), and 1,4‐butanediol. The resulting copolyesters exhibit a two‐phase domain structure consisting of amorphous polyether ester sof…
A sequence ( x n ) ( n = 1, 2, . . .) is periodic if x n+p = x n for some p and all n . Periodic sequences arise naturally in geometry and arithmetic in the study of mosaic patterns [4], continued fractions and frieze patterns [3; 5]. Some digital oscillators and tone generators also generate periodic sequences. In th…
Abstract Nickel ions play similar roles to magnesium ions in nickel-containing hydrous layer silicates. The extent of the replacement of Mg by Ni ranges from small proportions to complete, or almost complete, replacement. Particular interest attaches to the micro-crystalline, clay grade, minerals formed by processes o…
Abstract The pzc of H + -kaolins determined by titration method is nearly pH = 3. The pzc of SiO 2 + Al 2 O 3 mixtures is not additive, and depends principally on Al 2 O 3 content in mixture. The curve pzc—t°C (t°C = temperature of treatment of kaolins) has two maxima: 4·7 after treatment at 800-900°C, and 5 after tre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of three crystalline modifications of anhydrous copper(II) formateA. K. Galwey, D. Jamieson, and M. E. BrownCite this: J. Phys. Chem. 1974, 78, 26, 2664–2670Publication Date (Print):December 19, 1974Publication History Published online16 June 2008Publis…
This summarizes the important physical and electrical characteristics of these diverse and highly useful insulating materials. Factors of chemical structure which influence the resulting resin properties are discussed. The great variety of properties which can be achieved through variations in this one class of resins…
Abstract Densified glasses, formed from the liquid state by cooling at 5°C/hr under elevated pressures of up to 517 MN/m 2 , were studied by thermal analysis and dilatometry at ambient pressure. The materials studied were polystyrene, poly(methyl methacrylate), phenolphthalein, sucrose, and a 1 : 1 mixture by weight o…
Abstract The endotherm enthalpy changes Δ H D and temperatures T D of thermal denaturation of tropocollagen fibers were measured by DSC calorimetry as functions of water content. The denaturation temperatures decrease with increasing water content. The enthalpy change values increase sharply in the range 0–28% of wate…
Abstract A number of linear, four‐ and six‐branched regular star polyisoprenes were synthesized by anionic polymerization techniques in benzene using lithium as the counterion and polyfunctional silicon chloride compounds as the coupling agents. Light‐scattering measurements in dioxane were performed in order to estab…
Thermal Brillouin scattering has been studied in fused silica from room temperature, through the glass transition temperature (1200°C), and up to near the melting temperature of quartz (∼1700°C). The shear and longitudinal Brillouin shifts, the longitudinal linewidth, Pockel's coefficient, and the Landau-Placzek ratio…
New electro-optic effects in nematic liquid crystals have been found with a gratinglike array of in-plane interdigital electrodes. High-contrast light valving has been demonstrated in a tunable optical-activity mode and in two tunable birefringence modes. All three field-effect modes utilized a positive-dielectric-ani…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in transition metal dimers. III. Nickel(II) di-.mu.-cyanato, di-.mu.-thiocyanato, and di-.mu.-selenocyanato complexes and related outer-sphere copper(II) complexesD. Michael. Duggan and David N. HendricksonCite this: Inorg. Chem. 1974, 13, 12,…
Structural studies on hydrogen bonding in segmented polyurethane-urea elastomers were made using IR spectroscopy. Further, the orientation behavior of both the hard and soft segments on deformation was investigated using IR dichroism measurements. Hydrogen bonding was found to be formed not only between the hard segme…
Lysyl oxidase catalyzes the formation of crosslinking aldehydes in collagen and elastin. This report demonstrates that the enzyme has high activity with collagen precipitated as native fibrils, an apparent K(m) of 0.95 muM, and low activity toward either soluble forms such as denatured collagen, isolated alpha chain,…
Bauschinger data for dispersion-strengthened single crystals are given, and correlated with data on the dislocation microstructure and the softening effect which is prominent at room temperature in copper. The data are analysed in terms of theories presented in earlier papers, and the following conclusions have been r…