Materials Literature
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The open circuit growth of the thin oxide films on titanium in 0.5N solutions of H2SO4, NaOH, and Na2SO4 is studied. The results indicate markedly the dependence of the growth behavior on the electrolyte composition. Anodic oxide film growth on titanium is carried out in 0.5N H2SO4. After interruption of the current,…
Abstract The cooperative binding of n ‐mers to a finite ring, a finite open chain, and an infinite chain is treated in a unified way using the matrix method. For an infinite chain, the implicit closed‐form expression (“Scatchard formula”) for the fraction of bound sites obtained by McGhee and von Hippel, is simply red…
Annealing of acceptor dominated α-Al2O3 at Tsat = 1100–1500 °C in atmospheres containing hydrogen leads to dissolution of hydrogen, changing the material from p- to n-type when the concentration of hydrogen donors is larger than that of the acceptor impurities present. If oxygen equilibrium is maintained, the concentr…
A self-consistent interpretation of the Raman and infrared spectra and the heat-capacity measurements on Dy2O3, Er2O3, and Yb2O3, which have the cubic (bixbyite) structure, is presented. New spectra recorded at 10, 80, and 300 °K on oriented single crystals of each oxide are compared with published spectral data and i…
Audio frequency a.c. loss measurements in sputtered hydrogenated amorphous germanium films made over the temperature range 30–150 K are described. The measurements show similar features to those previously reported for evaporated films, namely a frequency exponent which decreases with temperature and a low-frequency l…
The scattering of electromagnetic waves from a periodic dielectric interface is studied for a general angle of incidence. It is called conical diffraction in grating theory for the general case where the incident wave vector is not perpendicular to the ruling direction of the gratings. We adopt the electric and magnet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFragmentation mechanism and energetics of some alkyl halide ionsH. M. Rosenstock, R. Buff, M. A. A. Ferreira, S. G. Lias, A. C. Parr, R. L. Stockbauer, and J. L. HolmesCite this: J. Am. Chem. Soc. 1982, 104, 9, 2337–2345Publication Date (Print):May 1, 1982Publication History…
Soft contact lenses and ablative heat shields for spacecraft require materials with vastly different physical properties. Yet the materials for both—permeable elastic membranes and tenacious high-temperature composities—are products of polymer science.
Condensation of chiral S-4-(6-methyl)octyloxy-2-hydroxybenzaldehyde (S-4-0- (6-methyl)octylresorcylaldehyde) with 4-alkylanilines (the MORA series, 3) gives low-melting Schiff bases showing chiral smectic C phases at or slightly above room temperature. The previously known MBRA series (4'-0- (2-methyl)-butyl- resorcyl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimensional probes of enzyme-coenzyme binding sitesNelson J. LeonardCite this: Acc. Chem. Res. 1982, 15, 5, 128–135Publication Date (Print):May 1, 1982Publication History Published online1 May 2002Published inissue 1 May 1982https://pubs.acs.org/doi/10.1021/ar00077a001https:…
We introduce a method, which is free of specimen edge effect, for the determination of critical stress in material brittle fracture. Using this method, we have investigated the critical stress in silicon brittle fracture. Silicon wafers polished with silica gel showed an average fracture stress of 2.8 GPa, with a stan…
Methods are described for improving the accuracy and sensitivity of measurements of the electric response of crystals piezoelectrically or electrostrictively excited to natural modes of vibration. In such way it is feasible to simultaneously determine linear as well as nonlinear electromechanical and elastic propertie…
Abstract The following conclusions can be drawn from the above results and discussion: (1) The bonding between jute fiber and rubber matrix is poor without any bonding agent. (2) Addition of 5 phr silica is essential and sufficient for promoting adhesion between fiber and matrix of a mix containing 5 phr resorcinol an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of some perfluoro- and polyfluorodiacyl peroxidesChengxue Zhao, Renmo Zhou, Heqi Pan, Xiangshan Jin, Yangling Qu, Chengjiu Wu, and Xikui JiangCite this: J. Org. Chem. 1982, 47, 11, 2009–2013Publication Date (Print):May 1, 1982Publication History Publish…
In mixtures of soap and water, the special properties of soap molecules cause them to form clusters—and clusters of clusters—in a variety of interesting geometrical shapes. Some of these aggregates are liquid crystals, known as lyotropic, which are quite different from thermotropic liquid crystals, the focus of most o…
Trapping of ion-implanted deuterium by lattice defects in nickel has been studied by ion-beam-analysis techniques in the temperature range between 30 and 380 K. The deuterium-depth profiles were determined by measuring either the α particles or the protons from the 3He-excited nuclear reaction D(3He,α)p, and the deute…
The changes in the cellulose structure by compression milling were studied and expressed in terms of crystallinity, accessibility, specific surface area, and degree of polymerization. The kinetic parameters, maximum reaction rate, and Michaelis constant were determined experimentally. Based on the experimental results…
High‐density SiC‐AIN compositions were fabricated from powder mixtures by hot‐pressing in the 1700° to 2300°C temperature range. At 2100°C, a 2H solid solution was found from =35 to 100 wt% AlN. The single‐phase solid solution samples had steep composition gradients of >10%/μm within the grains. Lattice parameters…
"Volume Holography and Volume Gratings." Optica Acta: International Journal of Optics, 29(5), p. 592
Lead magnesium niobate Pb(Mg1/3Nb2/3)O3 (PMN) is a relaxor ferroelectric with a disordered perovskite structure. A statistical inhomogeneity in the distribution of Mg2+ and Nb5+ ions in the B-sites of an ABO3 perovskite lattice leads to a wide Curie temperature range in which the crystal exhibits an intimate mixture o…