Materials Literature
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Stripe domain patterns have been observed in a nematic liquid crystal film excited by ultrasonic waves propagating in a sandwiched glass-nematic-glass medium. The effect was found to be due to molecular reorientation induced by acoustic streaming in the nematic film. Based on a simple fluid dynamical model, we calcula…
We have measured the complex dielectric function of sputtered ZnO films over a wide frequency range (10−2–107 Hz) and over a temperature range extending from −60 to 100 °C. A detailed examination of these results reveals the contributions of band conduction and hopping conduction to the dielectric dispersion. In certa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of the NH(A3.PI., c1.PI.) radicals by electron impact near thresholdKiyoshi Fukui, Iwao Fujita, and Keiji KuwataCite this: J. Phys. Chem. 1977, 81, 13, 1252–1257Publication Date (Print):June 1, 1977Publication History Published online1 May 2002Published inissue 1 J…
Investigations of the properties of electron backscattering are surveyed with respect to the application for thickness determination of self-supporting films and of surface films (top layers) on bulk materials, e.g., in electron microscopy.
The Peierls mechanism for dislocation movement based on the formation and motion of double kinks has been investigated for a/2〈110〉 edge dislocations in MgO. Characteristic parameters of this mechanism, such as the activation energy and volume, have been calculated as a function of the applied resolved shear stress (R…
A general mixture rule, which has the correct type of phase symmetry, is proposed for estimating the properties of composites having two continuous phases. The form of this equation is different from the equations used to predict the properties of composites with one continuous phase and one dispersed phase. The propo…
Potentiodynamic cyclic polarization tests on Type 316L stainless steel, a common orthopedic implant alloy, in Ringer’s solution show considerable hysteresis and a protection potential more active than the open circuit corrosion potential. This implies that chances of repassivation of actively growing pits in this allo…
Summary Adsorption‐desorption and isotopic‐exchange isotherms for acids soils of known clay mineralogy indicated that when all the surfaœ P accessible to the solution was considered, the bonding energy for phosphate decreased exponentially with site coverage. The soils differed markedly in the quantities of surface P…
The glass-transition temperatures (T g ) of thirty-one polyamide homopolymers and copolymers of widely differing molecular structure have been determined by differential scanning calorimetry or, as fibers, by dynamic tensile property measurements, and the results have been related to molecular structure. The effect of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus-nitrogen compounds. 31. Crystal and molecular structure of a platinum-cyclophosphazene complex: cis-dichloro[octa(methylamino)cyclotetraphosphazene-N,N'']platinum(II)Robert W. Allen, John P. O'Brien, and Harry R. AllcockCite this: J. Am. Chem. Soc. 1977, 99, 12, 3…
The resistivities and activation energies of borate glasses containing oxides of both V and Fe, and both V and Cu are lower than those of glasses containing the same amounts of each TM oxide separately. Optical and ESR spectra suggest that the proportions of ions in reduced valence states are not greatly affected by m…
A monobenzoporphyrin has been prepared from porphyrin derivatives containing a fused cyclo-hexanone ring. The cyclohexanone system can be constructed either before or after the porphyrin macrocycle has been synthesized. The spectroscopic properties of the monobenzoporphyrin are described and these support the proposal…
Abstract X‐ray diffraction scans and infrared absorption spectra for the C‐CI stretching region were obtained for a highly syndiotactic poly(vinyl chloride) (PVC) sample made by the urea clathrate method. When the polymer was annealed at a series of increasing temperatures up to 180°C, x‐ray diffraction measurements s…
Abstract Protein complexes of smectites in soils are difficult to detect if the usual smectite tests show no peculiarities. Andalusian black earths are typical examples. Investigation of the alkylam-monium derivatives, however, allows detection of adhered macromolecules which might be protein-like although this cannot…
Abstract Experimental carbonate cementation under various conditions of temperature, solution composition and physical environment of cementation resulted in cements analogous to their natural counterparts reported in the literature. Scanning electron microscopic (SEM), optical microscopic, and chemical analyses of th…
A folate-binding protein has been solubilized from Lactobacillus casei by treatment of membrane preparations with Triton X-100 in the presence of [3H]folate. The protein-folate complex was purified 100-fold and recovered in a 22% yield by adsorption and elution from microgranular silica (Quso G-32), followed by passag…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interactions in halide-bridged chains of copper(II). Cu(Rpy)2X2Van H. Crawford and William E. HatfieldCite this: Inorg. Chem. 1977, 16, 6, 1336–1341Publication Date (Print):June 1, 1977Publication History Published online1 May 2002Published inissue 1 June 1977https:…
Crosslinked polyacrylamide gels formed by copolymerisation of acrylamide and N,N′-methylenebisacrylamide in aqueous solution have been characterised by viscoelastic measurements in the frequency range 0.05–150 Hz. These data are consistent with the model, derived from permeability data, of a non-draining central core…
This paper describes preliminary pyroelectric and piezoelectric results obtained with commercial films of nylon 11. The results of dielectric-constant measurements in the temperature range 20–130 °C are also presented. Nylon 11 films show quite high pyroelectricity and the evidence indicates that there is probably dip…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn approximate expression of the electrostatic molecular potential in terms of completely transferable group contributionsRosanna Bonaccorsi, Eolo Scrocco, and Jacopo TomasiCite this: J. Am. Chem. Soc. 1977, 99, 14, 4546–4554Publication Date (Print):June 1, 1977Publication H…