Materials Literature
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Abstract The synthesis of a block copolymer with polystyrene (PS) and polycarbonate (PC) segments is described. It is produced by anionic polymerization of the styrene and endcapping with a hydroxyl group followed by subsequent reaction with phosgene and bisphenol‐A. The polystyrene/polycarbonate block copolymer was u…
The Al composition of AlGaAs has been determined by four methods: high-resolution transmission electron microscopy (HRTEM), reflection high-energy electron diffraction (RHEED), photoluminescence (PL), and double-crystal x-ray diffraction (DCXRD). HRTEM is direct and the most accurate method because it does not involve…
Domain wall processes (domain wall configuration, propagation, and collapse) in magnetostrictive amorphous wires of the composition Fe/sub 77.5/Si/sub 7.5/B/sub 15/ were investigated. The wires were held under tensile stress (up to 1700 MPa in the case of as-quenched). The domain wall length and normal mobility (or da…
This paper describes an attempt at a theoretical study of large-scale tensile defor mation of plain woven fabrics. The basis of the investigation is to use a more realistic approximation of nonlinear yarn bending behavior for both the undeformed fabric state and the stress analysis than has been used by most previous…
The thermal properties of 4-cyanophenyl 4-(4-alkyloxybenzoyloxy)benzoates having a lateral substituent have been examined. Commencing with the nonyloxy homologue the hydrogen derivative shows a smectic A phase having a partially bilayered arrangement (SAAd). When the substituents are introduced at position X, the SAd…
The mixed oxidation-chlorination of iron in gas mixtures of Ar, O2, and Cl2 at 1000 K has been investigated by thermogravimetric analysis and examination of the corrosion products by optical and scanning electron microscopy and X-ray diffraction analysis. Vapor phase transport of iron chlorides influences the rate of…
Escherichia coli citrate synthase is strongly and specifically inhibited by NADH, but this inhibition can be prevented by reacting the enzyme with Ellman's reagent. We have now labeled the single reactive cysteine covalently with monobromobimane and isolated and sequenced the bimane-containing cyanogen bromide peptide…
The electrochemical behavior of a carbon fiber/vinyl ester composite in 3.5% NaCI solution was investigated. The technique chosen for the study was electrochemical impedance spectroscopy (EIS), which enables time-dependent data to be acquired nondestructively on single samples. The data from the measurement technique…
A method is proposed for calculating the internal stresses in ferroelectric and ferroelastic ceramics which is based on the modelling of the mechanical sources of stress by fictitious dislocations continuously distributed on the grain and twin boundaries. For tetragonal and orthorhombic ceramics with a lamellar twin s…
The contrast agents gadolinium-DTPA (diethylenetriaminepentaacetic acid), Gd-DOTA (tetraazacyclododecanetetraacetic acid), and Gd-HP-DO3A (1,4,7-tris[carboxymethyl]-10-[2' hydroxypropyl]-1,4,7,10-tetraazacyclododecane) are used in humans as extracellular contrast agents. Although free Gd+ ion is toxic, the intact Gd3+…
Amorphous solid D2O from hexagonal and cubic ices and H2O from (HF, NH3, and NH4F) doped hexagonal ice have been prepared by Whalley’s method, and their thermal behavior has been investigated by differential scanning calorimetry from 103 to 250 K. For a heating rate of 30 K min−1 , the temperature of the onset of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent nitridorhenium(V) complexesGregory A. Neyhart, Kevin J. Seward, James Boaz, and B. Patrick SullivanCite this: Inorg. Chem. 1991, 30, 24, 4486–4488Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1…
Abstract The phosphate mineral distribution as it relates to in situ soil solution composition of two Alfisols developed from phosphatic Ordovician limestones in the inner Bluegrass Region of Kentucky was investigated. At both sites, microcrystalline apatite appeared to be the primary source of P. Surface weathering u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of sequence distribution on miscibility in polymer blendsMary E. GalvinCite this: Macromolecules 1991, 24, 23, 6354–6356Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.org/doi/10.…
The use of the mixed fluorocarbon/hydrocarbon ether sequence [1H,1H,5H-octafluoro-1-pentoxy-]ethoxy in place of aliphatic or aliphatic ether sequences significantly enhances the temperature range of the chiral smectic C (Sc*) liquid crystalline phase. Considerations derived from the literature, supported by computer m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface cristobalite formation by mild hydrothermal treatment of silica gel and its effect on the deposition of tris(allyl)rhodium and subsequent reactivity of (silica)rhodium(allyl)2H. Eric Fischer, Steven A. King, John B. Miller, Jackie Y. Ying, Jay B. Benziger, and Jeffre…
Competing single-ion 4f magnetic anisotropies have been studied within a noncollinear three-sublattice mean-field crystal-electric-field model in order to explain the observed complex magnetic behavior in the pseudobinary series ${\mathrm{Pr}}_{\mathit{x}}$${\mathrm{Nd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{…
NMR spectroscopy and optical microscopy have been used to study phase transitions and structure in nematic lyotropic mesophases formed by potassium laurate, decylammonium hydrochloride and water. The different mesophases obtained in a well-defined composition range have been characterized, by deuterium NMR, following…
The three-dimensional structures of apo- and holomutant human lysozymes (D86/92 lysozyme), in which a calcium binding site was designed and created for enhancing molecular stability by replacing both Gln86 and Ala92 with aspartic acids, were refined at 1.8-A resolution by x-ray crystallography. The overall structures…
The synthesis and crystal structure of a new perovskite-based bismuth oxide are reported. The phase, of composition ${\mathrm{Ba}}_{1.7}$${\mathrm{K}}_{1.3}$${\mathrm{Bi}}_{2}$${\mathrm{O}}_{7}$, is the n=2 member of the Ruddlesden-Popper series ${\mathit{A}}_{\mathit{n}+1}$${\mathit{B}}_{\mathit{n}}$${\mathrm{O}}_{3\…