Materials Literature
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Electroactive polyaniline (PAn) films were deposited from PC (propylene carbonate)‐EC (ethylene carbonate) and PC‐DME (1,2‐dimethoxyethane) mixed polymerization solutions containing aniline, , and . Higher dielectric constant solvents are necessary to deposit the PAn film where protons, dissociated from the acid, init…
Although chloride ions have long been known to promote crevice corrosion in metals, little detailed understanding is available. In this paper, measurements of the potential, pH, and current inside the crevice, and simultaneous viewing of the crevice wall through a transparent portion of the crevice, have provided new…
Mullite‐zirconia composites are prepared by reaction sintering of zircon and alumina, either using reaction and sintering additives (titania (T‐MZ) or magnesia (M‐MZ)) or starting from highly reactive powder mixtures obtained by an ultra‐rapid‐quenching technique (URQ‐MZ). In the latter case, the presence of large amo…
Abstract X-ray diffraction and chemical analyses were performed on clay fractions separated from an acid brown soil (Dystrochrept) by means of size fractionations using high-gradient magnetic separation techniques. Breakdown of large phyllosilicates preexisting in the saprolite involved physical fragmentation and mine…
Slow tensile straining, over a range of strain rates, of specimens machined from two commercial duplex stainless steel pipes has identified the important factors influencing their degree of embrittlement by hydrogen. Despite their very different microstructures, both materials suffered a significant loss in ductility…
Metal Complexes with Tetrapyrrole Ligands, LIX. – Redox Potentials, Near‐Infrared Absorption, Ionic Radii, and Ring‐Ring Distance in Metal(III) Bis(tetraphenylporphyrinate) Systems with Porphyrin Rings in Different Oxidation States An extended series of tetrabutylammonium salts of bisporphyrinate double decker anions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergetics and geometry of conducting polymers from oligomersAlfred Karpfen and Miklos KerteszCite this: J. Phys. Chem. 1991, 95, 20, 7680–7681Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October 1991https://pubs.a…
The unfolding and refolding kinetics of six proline mutants of the human lysozyme (h-lysozyme) were carried out and compared to that of the wild-type protein. Our results show that the slow refolding phase observed in the h-lysozyme refolding kinetics cannot be ascribed to proline isomerization reactions. The h-lysozy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized reflectance spectra of single crystals of the phthalocyanine radicals NiPc(AsF6)0.5, H2Pc(AsF6)0.67, and LiPcK. Yakushi, T. Ida, A. Ugawa, H. Yamakado, H. Ishii, and H. KurodaCite this: J. Phys. Chem. 1991, 95, 20, 7636–7641Publication Date (Print):October 1, 1991P…
Using the evanescent-wave ellipsometry technique, we have observed the growth of a disordered liquid-crystal layer adjacent to a ${\mathrm{SiO}}_{\mathit{x}}$-coated surface near the nematic-isotropic transition. We have also observed the pretransitional growth of a planar-oriented liquid-crystal layer in the isotropi…
NMR study of mullite precursors has shown that local arrangement of Al in samples synthesized by spray pyrolysis differs considerably from the one adopted by samples obtained by polymeric or colloidal routes. Aluminum is tetra‐ and pentahedrally coordinated in the first type of samples but is tetra‐ and octahedrally c…
Abstract Methyl-substituted derivatives of 1,3,5-tris(diphenylamino)benzene (TDAB) are found to show unique solid-state morphology, as characterized by differential scanning calorimetry and X-ray diffraction. These compounds readily form stable amorphous glasses having glass-transition temperatures of ca. 50 °C. p-Met…
The 13 major enzymes which compose the glycolytic and fermentative pathways in Zymomonas mobilis are particularly abundant and represent one-half of the soluble protein in exponential-phase cells. One- and two-dimensional polyacrylamide gel electrophoresis maps were developed for 12 of these enzymes. Assignments were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of neutron reflection and spectroscopic ellipsometry for the study of the interface between miscible polymer filmsBryan B. Sauer and David J. WalshCite this: Macromolecules 1991, 24, 22, 5948–5955Publication Date (Print):October 1, 1991Publication History Published onlin…
We present the analysis of experimental results on second-harmonic generation in a novel ferroelectric liquid crystal (FLC) material, o- nitroalkoxyphenyl biphenylcarboxylate 1, synthesized specifically for large nonlinear coefficients. All nonzero dij coefficients have been measured, with the largest being d22 = 0.6…
The surface-stabilized ferroelectric liquid crystal (SSFLC) effect is a serious candidate for application in television displays, due to its high switching speed and viewing angle independence. For the television application, however, several severe requirements must be fulfilled, of which the demand for a large amoun…
Zirconia as well as yttria‐zirconia and calcia‐zirconia solid‐solution powders were crystallized under hydrothermal conditions from (co)precipitated hydroxides. The morphology of the powder particles is strongly dependent on the crystallization conditions. The powders crystallized in a water solution of Na, K, and Li…
Abstract Liquid‐crystalline polymers with mesogenic groups in the main chain and side chains as well as their networks are studied by the dynamic mechanical method. The homopolymers are compared with chiral copolymers of a similar chemical structure. Mechanical relaxation transitions are correlated with transitions ob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of the wavelength and potential dependence of surface enhanced Raman scattering on copper, silver, and gold electrodesBruce Chase and Bruce ParkinsonCite this: J. Phys. Chem. 1991, 95, 20, 7810–7813Publication Date (Print):October 1, 1991Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelationship of STM and AFM images to the local density of states in the valence and conduction bands of rhenium selenide (ReSe2)B. A. Parkinson, J. Ren, and M. H. WhangboCite this: J. Am. Chem. Soc. 1991, 113, 21, 7833–7837Publication Date (Print):October 1, 1991Publication…