Materials Literature
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A phenomenological free energy is used to describe the stable ordering of nematic liquid crystals confined to supramicron spherical cavities. In particular the effects of the saddle splay elastic constant, K 24, on the equilibrium structures and phase diagram of droplets with homeotropic surface anchoring are discusse…
The thermoluminescence (TL) glow peak in quartz, which appears in the uv at a temperature of 375 \ifmmode^\circ\else\textdegree\fi{}C when a ramp heating rate of 20 \ifmmode^\circ\else\textdegree\fi{}C/s is used, was measured for emission in the uv as well as in the green part of the spectrum. Two glow peaks appear se…
A new concept in polycarboxylic crosslinking agents for cellulose is introduced using olefinically unsaturated dicarboxylic acids, maleic acid (MA), and itaconic acid (IA). In contrast to previous studies involving acids containing at least three carboxylic groups per molecule, we found that the dicarboxylic monomers…
A high temperature study of synthetic zircon up to 1900K using high resolution neutron powder diffraction in combination with a mirror furnace. Zircon is tetragonal, space group I4 1 /amd, Z=4, a=6.605, c=5.987A.
Abstract The effect of anions on clay dispersion and the hydraulic conductivity (HC) of clay-sand mixtures has received little attention. This study investigates the effect that adding small amounts of anions has on the dispersivity and HC of reference clays. Mixtures of 3 and 6 g 100 g −1 kaolinite, smectite, and ill…
The edge and isthmus of the mantle of Pinctada margaritifera (Mollusc, Bivalvia) were studied using light and electron microscopy from a morphological and histochemical point of view. Six areas with several subareas were differentiated in the mantle edge. One of these areas is similar to the epithelium isthmus. Trials…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFiber-optic sensing of carbon dioxide based on excited-state proton transfer to a luminescent ruthenium(II) complexGuillermo. Orellana, Maria C. Moreno-Bondi, Eva. Segovia, and Maria D. MarazuelaCite this: Anal. Chem. 1992, 64, 19, 2210–2215Publication Date (Print):October 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectron spectra of phthalocyanine thin films: a valence band theoretical interpretationEnrique Orti and Jean Luc BredasCite this: J. Am. Chem. Soc. 1992, 114, 22, 8669–8675Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published i…
β‐Si 3 N 4 whisker‐reinforced β′SiAlON composites were fabricated by extrusion and densified, using pressureless sintering. Whisker alignment was observed in both the green and sintered microstructures. SEM analysis of polished, sintered samples showed a microstructure consisting of the original β‐Si 3 N 4 whiskers in…
The lysine-, arginine-, ornithine-binding protein (LAO) from Salmonella typhimurium has been purified to homogeneity and characterized. The dissociation constants (KD) were determined by equilibrium dialysis assay to be 14, 15, and 29 nM for L-arginine, L-lysine, and L-ornithine respectively. L-Histidine was found to…
Dispite a few studies on the Cu─O eutectic bonding of copper and alumina, the mechanism of Cu─Al 2 O 3 bonding has been unclear to the present, especially with respect to the formation of a reaction phase. The present work reveals that peel strngth decreases and recovers with the concentration of oxygen at the interfa…
Anisotropic gels are a novel type of material obtained by in situ polymerization of liquid crystal (LC) molecules in the presence of low molecular weight conventional LC molecules without reactive groups. The resulting anisotropic network (see figure) possesses the structure of the original LC mixture. These gels offe…
Hydrogen transport in metals is affected by processes occurring in the bulk, the surface/bulk, and gas/surface interfaces. Several models have been proposed to explain the permeation process. Here the development of the various models is discussed and the similarities and differences among them are highlighted. By con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel(I) octaethylisobacteriochlorin anion. An exceptional nucleophile. Reduction and coupling of alkyl halides by anionic and radical processes. A model for factor F-430M. C. Helvenston and C. E. CastroCite this: J. Am. Chem. Soc. 1992, 114, 22, 8490–8496Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(organophosphazenes) with poly(alkyl ether) side groups: a study of their water solubility and the swelling characteristics of their hydrogelsHarry R. Allcock, Shawn R. Pucher, Michael L. Turner, and Richard J. FitzpatrickCite this: Macromolecules 1992, 25, 21, 5573–5577…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of .alpha.-keto phosphate esters: photorelease of a caged cAMP.Richard S. Givens, Phillip S. Athey, L. William Kueper III, Bogdan Matuszewski, and Jie You XueCite this: J. Am. Chem. Soc. 1992, 114, 22, 8708–8710Publication Date (Print):October 1, 1992Publicati…
Many advanced composites can best be described hierarchically. In particular, the biological composites that occur in organisms are generally seen to be organized on discrete scale levels ranging from the molecular to the macroscopic. At each level the components are held together by specific interactions and organize…
Cristallisation dans Pbnm avec a=5.388, b=5.447, c=7.654A, Z=4; affinement jusqu'a R=0.028 pour l'ensemble de donnees (1) et R=0.026 pour l'ensemble de donnees (2). Les parametres structuraux et les densites electroniques sont determines a partir de deux ensembles de mesures realises independamment
mu-Crystallin is the major component of the eye lens in several Australian marsupials. The complete sequence of kangaroo mu-crystallin has now been obtained by cDNA cloning. The predicted amino acid sequence shows similarity with ornithine cyclodeaminases encoded by the tumor-inducing (Ti) plasmids of Agrobacterium tu…
The deposition rate of SiC on carbon‐coated Nicalon fibers from methyltrichlorosilane in hydrogen was measured as a function of temperature, pressure, total flow rate, and simulated reactant depletion. The results, together with kinetic information on the stability of methyltrichlorosilane, led to two conclusions: (1)…