Materials Literature
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Ceramic specimens of the complex perovskite oxide Ba(Fe 1/2 Nb 1/2 )O 3 were fabricated by conventional solid state sintering. Dielectric constants were measured as a function of temperature as well as of frequency. As a result, dielectric constants showed an unusual temperature dependence. Moreover, a large dielectri…
Abstract Incorporation of rick husk ash (RHA) fillers into polypropylene affected some of the thermal properties of polypropylene composites. Addition of the black rice husk ash (BRHA) filler raised the thermal degradation temperature while maintaining the oxidative stability. The thermal degradation temperature of th…
Growth of artificial pits in the Ni/sulfuric acid system was investigated using a microprobe technique for the potential monitoring and pH measurements within the pits, as well as routine electrochemical, solution analysis, and metallographic techniques. The measured data and the observed changes in shape of the pit w…
Abstract Compatibility of natural rubber (NR)/polystyrene (PS) blend is poor and can be enhanced by the addition of a graft copolymer of natural rubber and polystyrene (NR- graft -PS). The effects of homopolymer molecular weight, copolymer molecular weight, copolymer concentration, processing conditions and mode of ad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear-Induced Alignment of a Hexagonal Lyotropic Liquid Crystal as Studied by Rheo-NMRMichail Lukaschek, David A. Grabowski, and Claudia SchmidtCite this: Langmuir 1995, 11, 9, 3590–3594Publication Date (Print):September 1, 1995Publication History Published online1 May 2002P…
We have tested the effect of several cations in attempts to crystallize the ligand-bound forms of the leucine/isoleucine/valine-binding protein (LIVBP) (M(r) = 36,700) and leucine-specific binding protein (LBP) (M(r) = 37,000), which act as initial periplasmic receptors for the high-affinity osmotic-shock-sensitive ac…
One of the most commonly overlooked parameters in grain boundary engineering initiatives is solute-interface interactions involving solute concentrations typically in the ppm range. In this work, experimental evidence is presented that demonstrates the significant effect of such interactions upon (1) the specific prop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of the Restricted Geometry on the Morphology of Ultrathin Poly(di-n-hexylsilane) FilmsM. M. Despotopoulou, C. W. Frank, R. D. Miller, and J. F. RaboltCite this: Macromolecules 1995, 28, 19, 6687–6688Publication Date (Print):September 1, 1995Publication History Published…
A new method of high-resolution electron microscopy image analysis is presented which improves considerably the visibility of nanocrystals in amorphous materials. The technique is based on individual Bragg filtering of the lattice fringes in the image. The significant feature is that the amplitude and phase of the fri…
Over the past two decades the amount of effort devoted to the study of metal oxides by surface scientists has increased significantly. The general characteristics of the electronic structure of metal-oxide surfaces are now fairly well understood, although transition-metal oxides have been more thoroughly studied than…
Complex dielectric constant of an antiferroelectric liquid crystal family represented by 4-(1-methylheptyloxycarbonyl) 3-fluorophenyl 4'-dodecylbiphenyl-4-carboxylate was measured in the frequency range between 10 -2 Hz and 10 7 Hz. The experimental results were analyzed using a generalized Cole-Cole expression, and s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAryl fluoride monomers in nucleophilic aromatic substitution polymerization: evaluation of monomer reactivity by 19F NMR spectroscopyKenneth R. CarterCite this: Macromolecules 1995, 28, 19, 6462–6470Publication Date (Print):September 1, 1995Publication History Published onli…
Equilibrium constants and enthalpy changes for reactions catalyzed by the lyase class of enzymes have been compiled. For each reaction the following information is given: the reference for the data; the reaction studied; the name of the enzyme used and its Enzyme Commission number; the method of measurement; the condi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of p-Methylstyrene Comonomeric Units on the Polymorphic Behavior of Syndiotactic PolystyreneCarla Manfredi, Gaetano Guerra, Claudio De Rosa, Vincenzo Busico, and Paolo CorradiniCite this: Macromolecules 1995, 28, 19, 6508–6515Publication Date (Print):September 1, 199…
Phase analysis and dielectric measurement have been conducted for a comprehensive study of the phase transition in the whole composition range of (1- x )Pb(Yb 1/2 Nb 1/2 )O 3 - x PbTiO 3 (PYN-PT) ceramic system. For all compositions, a continuous series of complete solid solutions of the antiferroelectric (AFE) and th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas/Solid Reactions with Nitrogen DioxideGerd Kaupp and Jens SchmeyersCite this: J. Org. Chem. 1995, 60, 17, 5494–5503Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 September 1995https://pubs.acs.org/doi/10.1021/jo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCondensation of Keggin Anions Containing Chromium(III) and Aluminum(III), Respectively. 1. Synthesis and X-ray Structural Determination of [{A-.alpha.-SiO4W9O30(OH)3Cr3}2(OH)3]11-Knut Wassermann, Rosemarie Palm, Hans-Joachim Lunk, Joachim Fuchs, Norbert Steinfeldt, and Reinh…
A molecular-dynamics simulation of lithium metasilicate (${\mathrm{Li}}_{2}$${\mathrm{SiO}}_{3}$) has been performed. A clear two-step relaxation was observed at 700 K in a density correlation function (self-part) for Li ions following an exponential decay by vibrational motion. Oscillation is found in the second (\en…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the Alkali-Metal Vanadium Oxide Xerogel Bronzes: AxV2O5.cntdot.nH2O (A = K and Cs)Y.-J. Liu, J. A. Cowen, T. Kaplan, D. C. DeGroot, J. Schindler, C. R. Kannewurf, and M. G. KanatzidisCite this: Chem. Mater. 1995, 7, 9, 1616–1624Publication Date (Print):Septe…
SO<sub>2</sub> chemisorption on oxygenated Pt(111) enormously enhances the dissociative chemisorption and subsequent combustion of propane. This activation of the metal surface is induced by an adsorbed sulfoxy species which is formed at >220 K. In the absence of adsorbed SO<sub>2</sub> the sticking probability of…