Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Cellulose tri-n-alkanoates, fully substituted ester-type derivatives of cellulose, having acyl groups with n carbon atoms (3 < n < 18), are prepared and their thermal behaviour studied. It is found that samples of cellulose tri-n-alkanoates with n > form a novel thermotropic mesophase, characterized by a low birefring…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced dissociation and desorption of nitrous oxide on a platinum(111) surfaceJ. Kiss, D. Lennon, S. K. Jo, and J. M. WhiteCite this: J. Phys. Chem. 1991, 95, 21, 8054–8059Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published i…
Abstract Polyanilines have been known for over one hundred years. Recent studies of this chemically flexible polymer have demonstrated unusual chemical, electrical, and optical phenomena, both in insulating forms and conducting forms. The polyanilines differ substantially from earlier studied polyacetylene, polythioph…
Analytical expressions describing double-scattering intensities of the Compton and Rayleigh effects (Compton-Compton, Compton-Rayleigh, Rayleigh-Compton, and Rayleigh-Rayleigh contributions), are deduced in the framework of the transport theory for an infinitely thick sample irradiated with collimated monochromatic ra…
The effect of incorporating mullite into alumina by an infiltration process on the mechanical properties was investigated. Data for Young's modulus, strength, and fracture toughness for various composite compositions were compared with those for the unreinforced matrix (alumina). Measurements of Young's modulus by a r…
Electromagnetic interference (EMI) shielding characteristics of nitrile rubber composites filled with short-carbon fibre (SCF), conductive car bon black (Conductex™ 900), and filler blend (SCF + Conductex™ 900) have been studied. The measurements of shielding effectiveness (SE) were carried out in two different freque…
Mullite and ZrO 2 ‐mullite ceramics have been prepared by tape casting mixtures of Al 2 O 3 , quartz, and ZrO 2 powders and subsequent reaction sintering. Tape casting leads to homogeneous, high‐density green materials with good sinterability. The design of a thermal cycle which favors densification with respect to mu…
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…