Materials Literature
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Determinations of carbon dioxide solubility in melts of CaMgSirOu and NaCaAlSirO, composition at high pressure and temperature have been combined with Raman spectroscopic measurements of quenched melts to determine the structural role of CO, in silicate melts. Carbon dioxide solubility increases with increasing temper…
Abstract Mössbauer spectroscopy of dioctahedral phyllosilicates showed that on dehydroxylation iron which originally occupied M(2) and M(l) sites became, respectively, 5- and 6-coordinated. The 6-coordinated sites are very distorted. No migration of cations occurs in the course of heating the specimens for 1–3 hr at 6…
We have measured the diffusion coefficient and weight average molecular weight of type I collagen fibril fragments obtained by acid extraction of rat tail tendons and neutral extraction of lathyritic chick skin, using laser light scatttering techniques. The molecular weight and translational diffusion coefficient were…
This paper describes the effect of morphological structure on the electric strength and some physico-chemical properties of polymers with flexible chains (HDPE, LDPE, PP) and polymers with rigid chains (CA). It is shown that a polymer body has a discrete structure consisting of elements of different densities. The mos…
Polyimide is receiving increasing interest as a possible insulator on semiconductor devices, replacing SiO 2 . Several commercially available polyimides have been characterized by testing films of them for electric breakdown strength, conductivity, adhesion, and other properties. The results of these tests are summari…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text M. Kerker, O. Siiman, L. A. Bumm, and D.-S. Wang, "Surface enhanced Raman scattering (SERS) of citrate ion adsorbed on colloidal silver," Appl. Opt. 19…
The kinetics of corrosion were measured by accelerated oxidation tests on Co‐30Cr and Ni‐30Cr as a function of temperature from 600°–900°C, in the environment and deposit composition. The alloys were rapidly attacked at temperatures between 650° and 750°C when a liquid sulfate phase was obtained from an initially pure…
Abstract Thirty two boehmites, synthesized at temperatures ranging from room temperature to 300°C, were examined by scanning electron microscopy, transmission electron microscopy, electron diffraction, X-ray powder diffraction, differential thermal analysis, and infrared spectroscopy. The results show that boehmite ex…
The kinetics of polymer growth and especially gelation are discussed for a system of reacting f-functional monomeric units. The gelation models of Flory and Stockmayer are examined, and their implications concerning sol–gel interaction after gelation has occurred are clarified. A new model, in which the gel does not c…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical, spectral, structural, and charge transport properties of the "molecular metals" produced by iodination of nickel phthalocyanineCharles J. Schramm, Raymond P. Scaringe, Djordje R. Stojakovic, Brian M. Hoffman, James A. Ibers, and Tobin J. MarksCite this: J. Am. Chem…
Abstract XPS and AES have been applied to the surface analysis of antimony oxides, Sb 2 O 3 , Sb 2 O 4 and Sb 2 O 5 . By means of the computer‐operated separation of oxygen and antimony contribution, the oxygen to metal atomic ratios calculated from XPS data were found to be close to the expected values. An antimony p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer films on electrodes. 4. Nafion-coated electrodes and electrogenerated chemiluminescence of surface-attached tris(2,2'-bipyridine)ruthenium(2+)Israel Rubinstein and Allen J. BardCite this: J. Am. Chem. Soc. 1980, 102, 21, 6641–6642Publication Date (Print):October 8, 1…
A model for Raman scattering by a molecule adsorbed at the surface of a spherical particle is articulated by treating the molecule as a classical electric dipole. This follows Moskovits's suggestion [J. Chem. Phys. 69, 4159 (1978)] and the experiments by Creighton et al. [J. Chem. Soc. Faraday Trans. II, 75, 790 (1979…
The unusual low-temperature behavior of liquid water is interpreted using a simple model based upon connectivity concepts from correlated-site percolation theory. Emphasis is placed on examining the physical implications of the continuous hydrogen-bonded network (or ’’gel’’) formed by water molecules. Each water molec…
The distribution function of relaxation times underlying the nonexponential relaxation function of Williams and Watts is derived and compared with the analogous Cole–Davidson distribution function. In order to make the comparison between the two distribution functions, a simple empirical relationship between the Cole–…
A theory for surface enhanced Raman scattering (SERS) is developed. Effects due to realistic surface geometry and dielectric properties are included. Three sources of enhanced Raman scattering are noted: the image dipole enhancement effect, the increase of local field (’’lightning rod’’ effect), and the resonant excit…
The author shows that in materials with orbital degeneracy, the crystallographic and magnetic structures are strongly connected: the exchange interactions depend on the occupied orbitals, which are related to the crystallographic distortions. In the case of triply degenerate states, they point out the importance of th…
CONTENTS 1. Introduction 551 2. Theoretical models of the semiconductor-metal transition in disordered systems 552 3. Semiconductor-metal transition in molten semiconductors at high temperatures 561 4. Semiconductor-metal transition and criterion for minimal metallic conductivity of melts at T>Tmp 564 5. Metal-semicon…
The absoulte spin susceptibility of As${\mathrm{F}}_{5}$-doped trans-polyacetylene, ${[\mathrm{CH}{(\mathrm{As}{\mathrm{F}}_{5})}_{y}]}_{x}$, was determined by spin resonance techniques for $0.0004<~y<~0.138$. The Curie-law contribution decreases above $y=0.001$ to a level less than 1 ppm in the highly conductin…