Materials Literature
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Thermal shock testing of an alumina‐20 vol% SiC whisker composite showed no decrease in flexural strength with temperature differences up to 900°C. Alumina, on the other hand, normally shows a significant decrease inflexural strength with a temperature change of >400°C. The improvement in the thermal shock resistan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of a weak intermolecular photosensitive complex between an organic substrate and a polyoxometalate. Crystal and molecular structure of .alpha.-H3PMo12O40.cntdot.6DMA.cntdot.CH3CN.cntdot.0.5H2O (DMA = N,N-dimethylacetamide)Michael M. Williamson, Donald A. Bou…
The polymorphism of enstatite (MgSiO 3 ) is reviewed. Three stable phases occur—clinoenstatite, orthoenstatite, and protoenstatite, being stable at low, intermediate, and elevated temperatures, respectively — and new data concerning their crystallization from synthetic glasses are summarized. The phase transformations…
A test particle model (T-model) potential is derived for interacting rigid formamide (HCONH2) molecules and applied in MD simulations of the liquid phase. The most important features of the dimers predicted by the T-model potential are checked by large basis set SCF calculations. The most stable dimer is the cyclic ar…
Reaction of anionic platinum(II) derivatives (NBu4)[Pt(C6F5)3L] with O3ClOAgL′ affords the neutral heterobinuclear complexes (C6F5)3LPtAgL′ (L′ = PPh3, PEt3; L = SC4H8, PPh3, PEt3, PEtPh2, NC5H5) containing a direct Pt-Ag bond unsupported by covalent bridges. The molecular structure of a representative compound (L = S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical copolymerization of pyrrole with N-substituted pyrroles. Effect of composition on electrical conductivityJohn R. Reynolds, Paul A. Poropatic, and Rita L. ToyookaCite this: Macromolecules 1987, 20, 5, 958–961Publication Date (Print):May 1, 1987Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric control of aggregation in neutral silver(I) thiolates, [AgSR]n. Crystal and molecular structures of [AgSCH(SiMe3)2]8, a discrete molecular biscycle of weakly interacting [AgSCH(SiMe3)2]4 units, and of [AgSC(SiPhMe2)3]3 and [AgSC(SiMe3)3]4, discrete molecular monocycle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(alkyl/arylphosphazenes)Robert H. Neilson, Rahim Hani, Patty Wisian-Neilson, John J. Meister, Aroop K. Roy, and Gary L. HagnauerCite this: Macromolecules 1987, 20, 5, 910–916Publication Date (Print):May 1, 1987Publication History Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of plasmon frequency in the optical spectrum of Au18Ag20 cluster: the beginning of the collective phenomenon characteristics of the bulk?Boon K. Teo, K. Keating, and Y. H. KaoCite this: J. Am. Chem. Soc. 1987, 109, 11, 3494–3495Publication Date (Print):May 1, 198…
Computationally efficient discrete space-time models of spatially-ordered pattern formation dynamics (e.g., block copolymer phase separation dynamics) are proposed. Models are simple but can give sufficiently realistic spatial patterns, and their time evolution.
This paper describes light control films consisting of submicron liquid crystal droplets dispersed in epoxy matrices. These films, which can respond optically to both applied electric fields and temperature changes, are potentially useful for displays and light shutters. The optical performance of these films depends…
Abstract The addition of tricresyl phosphate, N ‐phenyl‐2‐naphthylamine, and 4,4′‐dichlorodiphenyl sulfone to polysulfone causes changes in thermal and mechanical properties of the glassy mixtures associated with antiplasticization, i.e., reduction in glass transition temperature and increase in stiffness. These chang…
Liquid and solid supercooling of molecular oxygen has been observed and studied in well-characterized porous sol-gel glasses. The depression of the solid-solid phase transition temperature was measured as a function of pore size, showing the strong influence of confinement on the solid phases. The liquid freezing-poin…
The out-of-plane anchoring strength at the interface between 4-n-pentyl-4′-cyanobiphenyl (5CB) and an obliquely evaporated SiO was measured as a function of temperature by applying the ‘‘high-electric-field technique’’ recently developed by Yokoyama and van Sprang [J. Appl. Phys. 57, 4520 (1985)]. The orientational ‘‘…
Abstract. We have examined transport, sites of photosensitization, and plasma protein binding by sulfonated derivatives of tetraphenylporphine in vitro and tumor localization of these products in vivo. Studies carried out in culture indicate that the mono‐sulfonated porphyrin sensitized mainly at intracellular loci wh…
The crystal structure of ${\mathrm{La}}_{1.85}$${\mathrm{Sr}}_{0.15}$${\mathrm{CuO}}_{4}$ has been determined at 300, 60, and 10 K by neutron diffraction powder profile analysis. The structure is of the tetragonal ${\mathrm{K}}_{2}$${\mathrm{NiF}}_{4}$ type at ambient temperature, but undergoes an orthorhombic distort…
Abstract The morphology of blends of polycarbonate and nylon 6,6 with a copolyester of 60 mole percent p‐hydroxybenzoic acid/40 mole percent poly(ethylene terephthalate) was characterized under different processing conditions. In particular, single‐screw extrusion, steady simple shear flow, and flow through a capillar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObtaining the kinetic parameters from thermogravimetry using a modified Coats and Redfern techniqueP. Ernesto Fischer, Chon Shin Jou, and Shyam S. GokalgandhiCite this: Ind. Eng. Chem. Res. 1987, 26, 5, 1037–1040Publication Date (Print):May 1, 1987Publication History Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure of formamide microemulsions from NMR self-diffusion measurementsK. P. Das, A. Ceglie, and B. LindmanCite this: J. Phys. Chem. 1987, 91, 11, 2938–2946Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1987h…
Solid state (diffusion) bonds have been developed in AA 7475E sheet material using different regimes of bonding temperature, pressure, and time. The bonds produced have exhibited shear strengths in the range 30–150 MN m−2 and have been found to be capable of withstanding peel during a slow high-temperature superplasti…