Materials Literature
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The ternary system Nd-Fe-Cu was investigated by means of optical and scanning electron microscopy, energy dispersive X-ray analysis and differential thermal analysis. The system can be split into three independent partial systems partitioned off by two quasibinary sections between Fe and NdCu 2 , and Fe and NdCu 6 . T…
Abstract This paper discusses various new aspects in the elasticity of rubbers and the statistics of elastomers. It is shown that the role of network topology is crucial in the statistics of rubbers. This is seen mostly on the influence of heterogeneities of crosslink density, which is also of practical interest. Stro…
Abstract The application of liquid crystalline siloxanes consisting of pentamethylhydrocyclosiloxane cores with attached cholesteryl‐, biphenyl‐ and photochromic spiropyran‐based mesogens as reversible optical data storage materials is demonstrated by grating formation with an argon ion laser beam operating in the UV…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of PMMA star polymers with siloxane cores via group-transfer polymerization using silyl ketene acetal functionalized cyclic siloxanesZ. Zhu, J. Rider, C. Y. Yang, M. E. Gilmartin, and G. E. WnekCite this: Macromolecules 1992, 25, 26, 7330–7333Publication Date (Prin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and stereophysical characterization of the Fischer-Palm-related 49-electron thiocarbonyl-capped triangular nickel clusters Ni3(.eta.5-C5H5-xMex)3(.mu.3-X)(.mu.3-Y) (x = 0, 1), containing .pi.-acceptor X and Y capping Ligands (X = Y = CS; X = CS, Y = CO): comparativ…
Abstract This review provides a brief introduction to the Langmuir‐Blodgett (LB) technique and to the utilization of ultrathin films in the fields of electronics and optics. The electrical and nonlinear optical properties of the Langmuir‐Blodgett monolayer and multilayers of organoruthenium complexes, ferrocene deriva…
Transmission electron microscopy (TEM), differential scanning calorimetry (DSC), wide-angle X-ray powder diffractometry (WAXD) and Fourier transform infrared spectroscopy (FTIR) were used to investigate the crystallization behavior of PHB granules from Alcaligenes eutrophus isolated by enzymatic purification. TEM exam…
Effects of hydrostatic pressure on the ferroelectric and related structural transitions are briefly reviewed. The lowest-order effect of pressure is a linear change of the transition temperature. The sign of the pressure coefficient of the transition temperature of a structural phase transition provides information on…
A self-consistent field theory was developed to account for the micellization of block copolymers in selective solvents. The mean-field expression used successfully by Edwards in treating the polymer excluded-volume problem was modified to enable it to be applied to chains in bad solvents without the generation of unr…
Abstract Several tetraazaporphyrins (TAPs) have been characterized by electronic absorption, fluorescence, and magnetic circular dichroism (MCD) spectroscopy, together with electrochemical methods. The absorption coefficients (ε) and band positions change markedly with changing TAP structure and solvent. The potential…
Poly-β-hydroxybutyrate (PBH) was recently shown to be produced in genetically engineered plants which expressed the genes from Alcaligenes eutrophus responsible for the formation of PHB from acetoacetyl-CoA. The transgenic plants accumulated PHB as granules which were similar in size and appearance to the bacterial PH…
In order to study the in vivo digestion of immobilized collagen and gelatin, these proteins labeled with 125I or fluorescein isothiocyanate (FITC) were covalently immobilized onto silicone surfaces, which were grafted with acrylic acid to introduce carboxyl groups, and implanted subcutaneously in rats and mice. When t…
We have determined the amino acid sequence of the alpha chain of a fibril-forming collagen from the body wall of the marine invertebrate Riftia pachyptila (vestimentifera) by Edman degradation. The pepsin-solubilized collagen chain consists of a 1011-residue triple-helical domain and short remnants of N- and C-telopep…
Resonant photoemission measurements have been performed on well characterized, stoichiometric (1012) surfaces of single-crystal Cr2O3 using synchrotron radiation. A strong resonant enhancement of the highest-lying valence-band states is observed across the Cr 3p → 3d excitation threshold. In light of the similarity of…
We report the synthesis and structure of a new, unusual indium manganese oxide, InMnO3, with a hexagonal layered structure containing manganese in trigonal bipyramidal coordination.
The structural model of tetragonal SeO 2 proposed by Mc- Cullough [JACS 59 (1937) 789] has been refined at 139 and 286 K. Space group P4 2 /mbc, Z = 8, M w = 110.96, a = 8.3218(9), c = 5.0541(6) A, V = 350.0(1) A 3 at 139 K and a = 8.3622(7), c = 5.0612(5) A, V = 353.9(1) A 3 at 286 K. 349 and 635 unique reflections r…
X-ray reflectivity, widths, centroid shifts and profiles for curved perfect crystals are calculated from a model. The crystal is approximated by a stack of perfect-crystal lamellae or blocks with a gradually changing (mean) orientation. A computer program has been developed to calculate the above quantities in the Joh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation studies on water absorption of ethylene ionomersShinichi Yano, Kenji Tadano, Nobuaki Nagao, Shoichi Kutsumizu, Hitoshi Tachino, and Eisaku HirasawaCite this: Macromolecules 1992, 25, 26, 7168–7171Publication Date (Print):December 1, 1992Publication Hist…
Abstract Experimental alteration of volcanic glass has been carried out in distilled water at 200°C and 150°C. The formation and transformation processes of alteration products have been examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), infrared abs…
We develop a phenomenological theory of the dynamic viscosity of colloidal suspensions, based on an extrapolation of the low-frequency behavior by use of a continued-fraction representation. In lowest approximation the dynamic viscosity depends on a small number of parameters, which may be determined experimentally. F…