Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical Properties of Poly(β-hydroxy butyrate). II. Conformational Aspects in SolutionR. H. Marchessault, Keizo Okamura, and C. J. SuCite this: Macromolecules 1970, 3, 6, 735–740Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published…
We have extended the theoretical work of Harvey et al. [J. Cellular Comp. Physiol. 24, 1–22 (1944)] and Strasberg [J. Acoust. Soc. Amer. 31, 163–176 (1959)] in order to consider the conditions that must exist in a liquid for a vapor cavity to be nucleated from an imperfectly wetted solid impurity (mote) in the liquid.…
The thickness dependence of resistivity and its temperature coefficient of thin metal films has been studied. A theory is proposed to include, the surface roughness in determining the film resistivity, in addition to the reduced mean free path to conduction electrons. The ratio of the roughness to the mean free path,…
Absorption corrections for cylindrical and spherical crystals have been evaluated by numerical integration for values of μR in the range 0 to 1.0, where μ is the mean linear absorption coefficient and R is the radius of the crystal. For this range of μR, which is that normally required for neutron diffraction data, in…
At \ensuremath{\sim} 155 \ifmmode^\circ\else\textdegree\fi{}K, the metallic corundum structure of ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ distorts to an insulating monoclinic one. Structural refinements of this low-temperature phase by x-ray diffraction techniques show an increase in the nearest-neighbor vanadium --- van…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxo complexes of titaniumGerold Schwarzenbach, J. Muehlebach, and Klaus MuellerCite this: Inorg. Chem. 1970, 9, 11, 2381–2390Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published inissue 1 November 1970https://doi.org/10.1021/ic5…
Abstract Optimum reaction conditions were evaluated for assay of serum ceruloplasmin by measurement of its p-phenylenediamine oxidase activity. The pH optima of p-phenylenediamine oxidase activities of human and rat ceruloplasmins were 5.45 and 5.2, respectively. The p-phenylenediamine oxidase activity of rat cerulopl…
A first-order metal-insulator transition with no change in long-range order occurs in the mixed oxides ${({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x})}_{2}{\mathrm{O}}_{3}$ with increasing $x (x\ensuremath{\approx}0.01 \mathrm{at} 1 \mathrm{atm}\mathrm{and} 298 ^{\ensuremath{\circ}}\mathrm{K})$ or decreasing pres…
Abstract Under appropriate conditions, both surface areas and cation exchange capacities of clay minerals can be measured by absorption of methylene blue from aqueous solutions. The method has been applied to two kaolinites, one illite, and one montmorillonite, all initially saturated with Na + ions. For Na-montmorill…
The experimental evidence concerning the density of states in amorphous semiconductors and the ranges of energy in which states are localized is reviewed; this includes d.c. and a.c. conductivity, drift mobility and optical absorption. There is evidence that for some chalcogenide semiconductors the model proposed by C…
Abstract Durch reduzierende Methylierung des Octaäthylporphinato‐zinks [ 6a ; (OÄP)Zn] entsteht α.γ‐Dimethyl‐α.γ‐dihydro‐octaäthylporphinato‐zink [ 8a ; (ODMH 2 )Zn]. In Eisessig wird 8a zu (ODMH 2 )H 2 9 entmetalliert, das in diesem Medium Cu 2⊕ ‐ und Ni 2⊕ ‐Ionen unter Bildung von (ODMH 2 )Cu 8b und sehr stabilem (O…
The authors report experimental results in support of probabilistic theory to show that spatial fluctuations of the oxide built-in charge are effectively responsible for surface potential fluctuations, which result in an apparent density of interface states increasing with the mean image charge.
Abstract The relations developed previously for the spinodal and the consolute state in quasi-binary polymer solutions (single solvent and polydisperse polymer) are extended so as to cover quasi-ternary systems containing in addition a second polydisperse polymer. The equations obtained also describe polymer compatibi…
Abstract Test specimens of polymethylm ethacrylate (PMMA) have been subjected to stress in the presence of methanol and the resulting craze growth behaviour has been investigated by means of the concepts of fracture mechanics. Sharp-notched tension specimens have been tested over a wide range of constant applied loads…
Factors limiting the accuracy of orientations determined by electron diffraction are considered quantitatively. It is shown that errors in the lattice parameter and the effects of tilting the specimen or lens aberrations are not in practice limiting factors. The accuracy is limited usually by the measurement of the di…
Measurements of γtb/γgb for Cu and Cu-Al alloys utilizing transmission electron microscopy and selected-area electron diffraction techniques, and measurements of γSF for Cu-Al alloys from observations of extended dislocation nodes have shown that both γtb/γgb and γgF decrease with increasing atomic percent Al. Values…
Fulvic acid is a water-soluble humic material with relatively low molecular weight that occurs widely in soils and waters. It can combine with lyophobic organic compounds such as alkanes, fatty acids, and dialkyl phthalates to form stable "complexes" that are soluble in water. Fulvic acid in an aquatic environment may…
An optical absorption band is produced at 113 nm (11.0 eV) in both pure and Mg-doped LiF by irradiation with x rays at room temperature. This band, which appears to be intrinsic like the $F$ band, is identified as the ${V}_{3}$ band. Its peak-wavelength position follows the same dependence on anion radius as has been…
Piezoreflectance has been measured in single crystals of bismuth with light polarized in the basal plane of the crystal for photon energies in the range 0.6 to 4.5 eV. The stress modulation of the optical reflectance was achieved by cementing a nearly circular disk of bismuth onto a lead-zirconate-titanate disk set in…
The anharmonicity correction to the zero-point energy change in the triatomic dihydride isotopic self-exchange equilibria, H2X+D2X=2HDX, is discussed. It is shown that the inclusion of the usually ignored term G0 in the expression for the anharmonic correction to the zero-point energy (G0 + 14Σxij) causes the anharmon…