Materials Literature
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An explicit expression for the sedimentation velocity at low particle Reynolds number in a concentrated suspension is derived and evaluated for two different approximations to the hydrodynamic interactions: a strict pairwise additive approximation and a far-field, or Rotne–Prager, approximation. It is shown that the s…
The ultrastructure and biochemical composition of cytoplasmic particles that form in chicken embryo fibroblasts during stress have been analyzed. We showed previously that these particles contained the small stress protein, sp 24, and antibodies specific to sp 24 were used here to identify the stress granule. In thin…
Synopsis A rapid method has been developed in order to compare the photostability of several sunscreen agents incorporated in the same type of emulsion. Thin films of the different preparations were spread on quartz plates and irradiated with a solar simulator. Differences in energy distribution according to wavelengt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of thin polymeric films on electrode surfaces by electropolymerization of o-aminophenolSatoshi Kunimura, Takeo Ohsaka, and Noboru OyamaCite this: Macromolecules 1988, 21, 4, 894–900Publication Date (Print):April 1, 1988Publication History Published online1 May 20…
Abstract The crystal structure of polythiophene is analyzed by the Rietveld whole‐fitting method on the X‐ray diffraction powder profile. Experimental data allow only a bidimensional characterization of the structure in the plane orthogonal to the chain axis with a pgg symmetry ( a = 7,79; b = 5,53 Å). Best fitting is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the crosslinking mechanism of benzophenone-containing polyimidesAnshyang A. Lin, Vinod R. Sastri, Giuliana Tesoro, Arnost Reiser, and Raymond EachusCite this: Macromolecules 1988, 21, 4, 1165–1169Publication Date (Print):April 1, 1988Publication History Published online1…
Dynamic light scattering and photon correlation spectroscopy are able to resolve large ranges of coherence times, and hence of scattering particle size or constant of diffusion, in a single measurement if a modern multiple-tau correlator is used. However, particular problems like bias and unsatisfactory statistical ac…
A new principle for analyzing the kinetic energy as well as the angular distribution of charged particles has been discovered. A new display type analyzer was constructed according to theory. It consists of an inner hemispherical grid and an outer hemispherical electrode which has a radius two times larger than that o…
High-resolution synchrotron-radiation powder data for quartz and Mg2GeO4, an olivine homologue, were obtained with a 365 mm long parallel-slit collimator with 0.05° aperture. The crystal structures were refined using a pseudo-Voigt profile fitting function and POWLS. Fourier maps were calculated from the measured stru…
The transfer function of a transformer winding is deconvoluted in the frequency domain from the digitally recorded neutral current and high voltage applied during impulse tests. The integrity of the winding insulation is determined by comparing the transfer function obtained at full and reduced test voltage. Differenc…
Results are presented for the measured single‐crystal elastic constants of yttria‐stabilized zirconia, for yttria contents of 1.7 to 20 mol%. The results cover a range of materials which vary from a mixture of monoclinic, tetragonal, and cubic to those which are fully cubic. These single‐crystal measurements are used…
The kinetics of molecular-beam epitaxy are examined by means of Monte Carlo simulations in combination with a new approach for monitoring surface growth, i.e., by calculating the evolution of the surface step density. The evolution of the step density is shown to have a remarkable correspondence to that of the measure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWet oxidation catalyzed by ruthenium supported on cerium(IV) oxidesSeiichiro Imamura, Ikumi Fukuda, and Shingo IshidaCite this: Ind. Eng. Chem. Res. 1988, 27, 4, 718–721Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 Ap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical reactions of imidazole with metallic silver studied by the use of SERS and XPS techniquesGi. Xue, Quinpin. Dai, and Shuangen. JiangCite this: J. Am. Chem. Soc. 1988, 110, 8, 2393–2395Publication Date (Print):April 1, 1988Publication History Published online1 May 200…
Abstract The build‐up of a positive charge during the XPS measurement of nonconducting materials can severely affect the spectral resolution leading to line broadening and time‐dependent energy shifts. The use of a low kinetic energy electron flood gun in conjunction with a metal screen placed in close proximity to th…
The development and the present state of a few key aspects of the theory of plasticity are sketched as a guide to the literature for those new to or not centrally involved in the subject. Only a small fraction of this extensive literature is cited. Special attention is paid to the frequently inspirational but more oft…
A novel oligonuclear compound, containing six manganese( 11) ions and six nitronyl-nitroxide radicals NITPh (NITPh = 2-phenyl-4,4,5,5-tetramethyl-4,5-dihydr1oH- -imidazolyl- 1- oxy1 3-oxide), [Mn(hfac),NITPh],, was synthesized, and its crystal structure, magnetic properties, and EPR spectra are reported. This cyclohex…
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Quantitative bulk ferromagnetic behavior has been established for the molecular/organic solid [Fe(III)(C(5)Me(5))(2)].(+)[TCNE].(-). Above 16 K the dominant magnetic interactions are along a 1-D chain and, near T(c), 3-D bulk effects as evidenced by the value of the critical exponents dominate the susceptibility. The…
New optoelectronic materials based on polymer dispersed liquid crystals (PDLC) show great potential for application in displays, temperature sensors, optical computing and for solar energy control. We report liquid crystal, termoset or thermoplastic materials. PDLC materials may be formed by several different processe…