Materials Literature
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The first paper on librational modes (LMs) of water in hydrated solids appeared in 1956 [l], although some earlier papers mentioned them in the context of other studies [2–4]. No detailed review is available, but articles in some books on water [5, 6], hydrogen bonding [7], and infrared (IR) spectra of inorganic and c…
The physical fact that diamond is electrically insulating while amorphous carbon and graphite are conducting is used in the present work to study the local damage that each implanted ion creates around its track and to conclude about the processes through which implanted diamond turns amorphous. Experimental data for…
The liquid state behavior of the following atactic polymers has been reviewed: the alkyl and cycloalkyl methacrylates; polyisobutylene; polybutadiene, its random copolymers with styrene and acrylonitrile, and S-B diblocks; polystyrene; and the poly-α-olefins C3, C5, and C6. Just as Tg manifests itself through time-dep…
Tetrasulphophthalocyanine and the ZnII and CuII complexes have intense absorption in the near i.r. region but the compounds aggregate in aqueous solution. Aggregation is hindered by addition of organic solvents, such as pyridine, and here H2PcS4– and ZnPcS4– show strong fluorescence. Photophysical data have been colle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of selenides and tellurides with positive halogenating speciesMichael R. DettyCite this: J. Org. Chem. 1980, 45, 2, 274–279Publication Date (Print):January 1, 1980Publication History Published online1 May 2002Published inissue 1 January 1980https://doi.org/10.1021/…
The layered MnPS3 reacts with a wide range of ‘guest’ cations G+, leading to new intercalation compounds of the type Mn1 –xPS3,G2x,(H2O)y.
Photocurrent spectroscopy has been used to examine the early stages of anodic film growth on titanium. Analysis of the photocurrent conversion efficiency as a function of wavelength for films formed at different potentials has shown that the film is essentially pure TiO2 above ca.1.5 V vs. SCE (at pH 0). Photocurrent…
The porphyrin photosensitizer, meso-Tetra (4-N-methyl-pyridyl) porphine tetraperchlorate is shown to unwind supercoiled ColEI DNA at a somewhat lower concentration than ethidium bromide. In contrast to this, the Fe(III) chelate of T4MPyP cannot unwind supercoiled DNA. It is concluded that these results corroborate our…
Anion self‐diffusion coefficients normal to (1102) were obtained for single‐crystal Al 2 O 3 in a 1.3 × 10 3 N/m 2 (10 −5 torr) vacuum at 1585° to 1840°C. Tracer was supplied from an initial 650 to 1300 A Al 2 18 O 3 layer produced by the oxidation of vapor‐deposited Al metal films in an 18 O 2 atmosphere at 520°C. Co…
The polarizability of O2- is investigated by means of a simple electronic model. While in cubic oxides α is proportional to the cell volume V, in anisotropic and covalent materials α≈Vn (where n is between 3 and 4) in compounds such as the ferroelectric perovskites.
Petrochemical, shortages have stirred renewed interest in cellulose because it is the single replaceable raw material, and exists in great abundance. This literature survey reviews the cellulose solvent systems that do not in general rely on stable cellulose derivatives that can be isolated. This review is arranged in…
Subsolidus phase relations were established in the system Si 3 N 4 ‐SiO 2 ‐Y 2 O 3 . Four ternary compounds were confirmed, with compositions of Y 4 Si 2 O 7 N 2 , Y 2 Si 3 O 3 N 4 , YSiO 2 N, and Y 10 (SiO 4 ) 6 N 2 . The eutectic in the triangle Si 3 N 4 ‐Y 2 Si 2 O 7 ‐Y 10 (SiO 4 ) 6 N 2 melts at 1500°C and that in…
Isometric tensions developed in connective tissue under the influence of temperature have previously been measured by their effect on a "shrinkage" phenomenon observed along the main axis of the collagen fibers. A new device, built and tested in our laboratory enabled us to obtain isometric tension curves by measuring…
Abstract At temperatures above that required for gelatinization, an order‐disorder transition is observed for wheat, maize, waxy maize and potato starches. This transition is the melting of the crystallites in the granules. A second, higher temperature, transition occurs in wheat and maize starches. This also appears…
Plastic deformation was studied in fine‐grained alumina polycrystals (grain sizes 1 to 5 μm); several deformation mechanisms occur simultaneously. This paper is concerned with basal slip and unaccommodated grain‐boundary sliding (GBS). The basal slip can give rise to a deformation texture. Cavitation occurs due to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of Segmented Poly(urethaneureas) Based on 2,4-Toluene Diisocyanate. 1. Thermal Transitions, X-ray Studies, and Comparison with Segmented Poly(urethanes)C. S. Paik Sung, C. B. Hu, and C. S. WuCite this: Macromolecules 1980, 13, 1, 111–116Publication Date (Print):Ja…
The pore structure of a fibrous carbon molecular sieve has been studied by adsorption of CO2, O2, C2H2, H2, N2, CO, Xe and SF6 as molecular probes. Apart from the negligible outer surface of the fibres, all adsorption sites posses molecular sieving properties. Mild activation steps enable the graduated opening of crit…
[N,P,T] Monte Carlo simulations of metastable supercooled-liquid and amorphous phases of Lennard-Jones atoms indicate several distinct signatures for identifying the glass transition boundary; i.e., the density, enthalpy, and pair distribution function dependences on temperature and pressure are different for the two…
Conference International Symposium on Photochemistry, International Symposium on Photochemistry, PHOTO, Photochemistry, Eighth, Seefeld, Austria, 1980-07-13–1980-07-19 Published Online: 2009-01-01 Published in Print: 1980-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIon and electron transport in stable, electroactive tetrathiafulvalene polymer coated electrodesF. B. Kaufman, A. H. Schroeder, E. M. Engler, S. R. Kramer, and J. Q. ChambersCite this: J. Am. Chem. Soc. 1980, 102, 2, 483–488Publication Date (Print):January 1, 1980Publication…