Materials Literature
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The integrated birefringence of a surfactant (C16H33NH2)-aligned methoxybenzylidene butylaniline cell as a function of applied magnetic field (up to 100 kG) has been measured. The Oseen and Frank elastic continuum theory and a generalized torque balance equation at the interface have been utilized for the calculation…
Abstract Dielectric measurements are reported on amine‐cured epoxy resin samples over a frequency range from 200 Hz to 200 kHz and a temperature range from −60°C to 70°C as a function of molecular weight of the diglycidyl ether and water content. The effects of change of the molecular weight of the diglycidyl ether on…
Many interpretations of metamorphic parageneses tacitly assume that a free fluid phase was always present during metamorphic equilibration (fluid-present metamorphism), as opposed to the circumstance that, while volatile species are certainly released from minerals during metamorphism, these species may not saturate t…
The actions of heat and flame on cellulosic fibres are compared with the physical and chemical behaviour of other fibres. The combustion mechanism is discussed in terms of concerted pyrolysis and oxidative stages, which can be represented as an energy feedback system. The action of different flame retardants are seen…
Porous silicon was obtained by anodic attack of single crystal silicon substrates in 25% hydrofluoric acid solutions. Specific surface area, total porous volume, and pore size distribution of porous silicon have been determined. The experimental technique used is based on the measurement of the volume of gas adsorbed…
The effects of sugars and polyols on the thermal denaturation temperature, Tm, of acid-soluble collagen from calf skin were studied at pH 4.0 under atmospheric pressure as well as high pressures up to 4,000 atm. Addition of these compounds invariably raised Tm with increases in their concentration over the whole range…
A method for analyzing slanted anisotropic gratings is presented. The propagation of electromagnetic waves in the periodic anisotropic media is described by coupled-wave equations in a unified matrix form expressing the coupling of the space harmonics in the grating region. The solution of the equations is reduced to…
We report the first observation to our knowledge of a sharp minimum in the attenuated total reflectivity of a thin metal film between index-matching layers. The resonance is due to the excitation of the long-range surface-plasmon mode on both sides of the thin metal films, as originally discussed by Sarid [Phys. Rev.…
The structure and dynamics of the full unit cell of a protein (bovine pancreatic trypsin inhibitor) containing 4 protein molecules and 560 water molecules have been simulated by using the molecular dynamics method. The obtained structure, atom positional fluctuations, and structure factors are compared with x-ray valu…
The phase diagram of the system ZrO 2 ‐CeO 2 was rein‐vestigated using hydrothermal techniques. Cubic, tetragonal, and monoclinic solid solutions are present in this system. The tetragonal solid solution decomposes to monoclinic and cubic solid solutions by a eutectoid reaction at 1050°50°C. The solubility limits of t…
Amorphous, unstained, frozen-hydrated sections of bacteria provide a faithful high-resolution image of procaryotic cells. Conventional preparation artifacts due to fixation, staining, and dehydration are nonexistent. Freezing damage is avoided by using glucose as a cryoprotectant. Cutting damage on frozen material is…
A theory of melting in two dimensions via the spontaneous generation of grain boundaries is worked out. We find that this mechanism is more favorable than the dislocation unbinding mechanism and that a first-order phase transition always results. The transition goes from strongly first order to weakly first order for…
Computer simulations have been carried out along the 90·2 K isotherm for the adsorption of Kr on graphite. The grand ensemble Monte Carlo technique was used and the adsorbate and adsorbent were represented by widely accepted two body potentials. Additional runs were also carried out in which the third body force, due…
The electronic structure behaviour of Me 2 O 3 oxides (Me = Ti, V, Cr) has been determined from XPS valence band and core level measurements. From Ti to Cr sesquioxide the relative intensity of the 3 d band increases systematically which can be explained by the (atomic) photoelectric cross section and the number of 3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetailed analysis of the optical absorption and emission spectra of europium(3+) in the trigonal (C3) Eu(DBM)3.H2O systemAndrew F. Kirby and F. S. RichardsonCite this: J. Phys. Chem. 1983, 87, 14, 2544–2556Publication Date (Print):July 1, 1983Publication History Published on…
Amorphous, electrically conducting polymeric films can be deposited from acetonitrile solutions of specific aromatic compounds containing an appropriate electrolyte. Free-standing films peeled off a platinum electrode have electrical conductivities σ between 10−3and 1 Ω−1-cm−1. Polymers resembling the better-known pol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA versatile phase equilibrium equation of statePaul M. MathiasCite this: Ind. Eng. Chem. Process Des. Dev. 1983, 22, 3, 385–391Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published inissue 1 July 1983https://pubs.acs.org/doi/10.1021/i20…
The mechanical and conducting properties of free-standing films of polypyrrole toluenesulfonate depend on the preparation conditions. Films prepared in aqueous ethylene glycol solvent mixtures show a variation of two orders of magnitude in the conductivity and of a factor of three in the tensile strength.
Radiationless energy transfer from excited dye molecules to silver islands has been studied. The dye is separated from the metal surface by a thin layer of SiOx. When the spacer layer thickness is increased from d=0, an increase in the luminescence intensity is observed. For the low quantum yield dye Basic Fuchsin, a…
Theoretical calculations are presented for equilibrium concentrations of zinc and oxygen vacancies in ZnO. Results are presented at the sintering temperature, and also at room temperature. Theoretical calculations of reaction constants show that the intrinsic donor is the oxygen vacancy, rather than the zinc interstit…