Materials Literature
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Alcohols have been shown to be useful as oxidizing agents of diethylzinc for the growth of ZnO films by MOCVD. C -axis oriented ZnO films have been deposited on glass substrates at 300°C. The problem of a premature reaction, which is observed between diethylzinc and oxygen or water vapor, is shown to be overcome when…
Nitrogen mineralization process in the submerged soils was mathematically formulated by a new technique, and parameters in the formula were examined in relation to temperature and soil properties. Thirteen Japanese soils including manured and non-manured soils and 4 Philippine soils were used in this experiment with o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectron spectra and bonding in cerocene, bis(.pi.-[8]annulene)cerium(IV)Andrew Streitwieser Jr., Steven A. Kinsley, John T. Rigsbee, Ignazio L. Fragala, and Enrico CilibertoCite this: J. Am. Chem. Soc. 1985, 107, 25, 7786–7788Publication Date (Print):December 1, 1985Pu…
Thirteen lake basins isolated during the Late Weichselian and Holocene are studied. The lakes are situated in two study areas, one on the west coast and one on the south coast of Norway. The diatom, genus Fragilaria shows a predominance in sediments deposited around the isolation independent of when the basins were is…
Abstract In this investigation on samples of high‐ and low‐density polyethylene and ethylene‐vinyl acetate copolymers, crystallinities ϕ W and crystalline densities ρ c W were obtained with the aid of wide‐angle x‐ray scattering (WAXS) methods. From small‐angle x‐ray scattering (SAXS) the following characteristics wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of porphyrin dimers, formed by pairing cationic and anionic porphyrinsEmmanuel Ojadi, Russell Selzer, and Henry LinschitzCite this: J. Am. Chem. Soc. 1985, 107, 25, 7783–7784Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Pub…
Fluorescence lifetimes were determined for porphyrins linked to quinones at two different fixed distances by bicyclo[2.2.2]octyl spacers. Electron-transfer rate constants for the one- and two-spacer homologues were calculated from the lifetimes. The incremental effect of the second spacer is to decrease the electron-t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular building blocks for the synthesis of ceramic materials: [Si8O12](OCH3)8V. W. Day, Walter G. Klemperer, V. V. Mainz, and D. M. MillarCite this: J. Am. Chem. Soc. 1985, 107, 26, 8262–8264Publication Date (Print):December 1, 1985Publication History Published online1 M…
Tetrakis(4-7V-methylpyridyl)porphine (H2TMpyP) and a number of its metal derivatives interact extensively with mononucleotides and mononucleosides in aqueous solution. The complexes formed are of a stacking-type involving extensive overlap of the -systems of the porphyrin and purine or pyrimidine bases. Coulombic attr…
Abstract A method for preparing compact orbital and auxiliary basis sets for LCAO‐LSD calculations has been developed. The method has been applied to construct basis sets for first row transition metal atoms from Sc to Zn for the 3 d n−1 4 s 1 and 3 d n−2 4 s 2 configurations. The properties of different expansion pat…
The Voigt function has been incorporated as a peak-shape description into a program for the refinement of constant-wavelength X-ray and neutron diffraction patterns. The results obtained for neutron diffraction are encouraging and indicate that the Voigt function describes the symmetrical component of the profile peak…
Abstract The accuracies of the approximation of the temperature integral of the Arrhenius law proposed by Coats and Redfern(CR), Doyle(D), Gyulai and Greenhow(GG), and MacCallum and Tanner(McT) have been tested. It has been demonstrated that these methods (only with the exception of the MacCallum and Tanner procedure)…
The physical principles underlying the oscillatory behavior of minute gas bubbles in liquids exposed to ultrasound are reviewed. Results from mathematical analyses suggest that these oscillations sometimes become unstable leading to transient cavitation in which a bubble violently collapses during a single acoustic ha…
Treatment of polyester, nylon 66, cotton, and wool fabrics with aqueous solutions of polyethylene glycol phase change materials and of plastic crystal compounds by a conventional pad-dry procedure produced modified fabrics with thermal storage and release properties 2-2.5 times greater than those of untreated fabrics…
Abstract It is shown that the Frame's method (also, Le Verrier‐Faddeev's method) for characteristic polynomials of chemical graphs can be extended to periodic graphs and structures. The finite periodic structures are represented by cyclic structures in the Born‐von Kárman boundary condition which leads to complex matr…
How fast can drug molecules randomly escape from a polymer matrix? This important question is of both scientific and practical importance, as increasing emphasis is placed on design considerations that can be addressed only if the physics of drug release is better understood. We study this problem using high accuracy…
The extended Maier-Saupe theory of binary nematics developed by Palffy-Muhoray et al. is extended to a wider range of interactions. This theory predicted that the biaxial phase is thermodynamically unstable in the absence of an external field, if the interspecies interaction strength satisfies the geometric mean rule.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaser spectroscopic and x-ray structural investigation of europium(III)-oxydiacetate complexes in solution and in the solid stateMichael Albin, Robert R. Whittle, and William DeW. Horrocks Jr.Cite this: Inorg. Chem. 1985, 24, 26, 4591–4594Publication Date (Print):December 1,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformation of microphase structures in segmented polyurethanesC. R. Desper, N. S. Schneider, J. P. Jasinski, and J. S. LinCite this: Macromolecules 1985, 18, 12, 2755–2761Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissu…
A diametral‐compression test that features disk specimens with chevron notches was developed and applied to measure fracture toughness (K lc ) of three ceramics. Fracture–toughness values calculated from the fracture loads and a compliance analysis were in good agreement with values measured by other fracture–mechanic…