Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-molecular-weight aromatic polyamides by direct polycondensationSaverio Russo, Alberto Mariani, Vladimir N. Ignatov, and Igor I. PonomarevCite this: Macromolecules 1993, 26, 18, 4984–4985Publication Date (Print):August 1, 1993Publication History Published online1 May 200…
The aluminium and nickel contents of Cu–Al–Ni alloy are varied to relate the parent phase chemistry to its shape memory behaviour. Rare earth and grain refining elements (titanium, zirconium, boron, etc.) are added in minor quantities to assess their effects on the grain refinement of the alloy and also on its shape r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe effect of end groups on thermodynamics of immiscible polymer blends. 1. Interfacial tensionCathy A. Fleischer, Jeffrey T. Koberstein, V. Krukonis, and P. A. WetmoreCite this: Macromolecules 1993, 26, 16, 4172–4178Publication Date (Print):August 1, 1993Publication History…
Abstract Das Octatellurid [K(15‐Krone‐5) 2 ] 2 Te 8 entsteht durch Oxydation einer Kaliumtritelluridlösung in Dimethylformamid durch Eisen(III)‐chlorid in Gegenwart von 15‐Krone‐5 als schwarze Kristalle, die wir durch eine röntgenographische Strukturanalyse charakterisiert haben. Raumgruppe Pca2 1 , Z = 4, 4 548 beoba…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance studies of blends containing poly(ethylene terephthalate) (PET) and poly(p-hydroxybenzoic acid-co-p-hydroxynaphthoic acid) (Vectra-A)Pei Tang, Jeffrey A. Reimer, and Morton M. DennCite this: Macromolecules 1993, 26, 16, 4269–4274Publication Date (P…
Abstract The purpose of this study was to investigate bonding mechanisms of representative inorganic anions and citrate with imogolite and allophane using electrophoresis. The electrophoretic mobility (EM) of synthetic imogolite and allophanes with Al/Si molar ratios of 2.02, 1.64, and 1.26 was determined in 0.001 and…
Viscometric data for seven compositions in the system NaAlSiOo-SiO, have been collected by the technique of concentric cylinder rheometry in the temperature and shear rate ranges 1000-1300'C and 10 2-8ls, respectively, for single-phase melts or supercooled liquids. As a function of increasing NaAlSiO.(N) content, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of polymer surfaces by SIMS. 16. Investigation of surface crosslinking in polymer gels of 2-hydroxyethyl methacrylateAshutosh Chilkoti, Gabriel P. Lopez, Buddy D. Ratner, Martin J. Hearn, and David BriggsCite this: Macromolecules 1993, 26, 18, 4825–4832Publication D…
Dolichyl-phosphate-mannose synthase is a membrane-bound enzyme of the endoplasmic reticulum that catalyzes the formation of dolichyl phosphate mannose from dolichyl phosphate and GDP-mannose. It is an essential enzyme for growth of Saccharomyces cerevisiae, and, like other enzymes that utilize some form of the lipid d…
Abstract The maximum crystal radius R n of ice in hollow wet chrysotile tubes is established by thermoporometry to be between 2.8 and 3.2 nm, and the internal pore volume V n of the tubes to be between 0.008 and 0.02 ml/g. The hollow tubes of chrysotile and, for comparative reasons, small plates of talc, are hydrother…
A combined elevated pressure reactor/ultrahigh vacuum (UHV) surface analytical system has been designed for studies of heterogeneous catalytic reactions. The reaction cell is separated from the surface analysis chamber by a differentially pumped sliding seal. This feature allows simple in situ sample transfer capabili…
As part of a study of milkweed fibers, various blends of cotton and milkweed were created and the physical fiber and yam properties analyzed. The study included a unique investigation of transverse properties of wall thickness and linear density. Spin ning trials of blends with very high percentages of milkweed fibers…
Abstract The ESR spectra of tetrathiafulvalene (TTF) derivatives substituted with imino pyrolidine- and piperidine-1-oxyls and their cation radicals were investigated. For the neutral TTF’s the unpaired electron is localized at the nitroxide group. While, an intramolecular spin-spin exchange albeit weak occurs between…
Abstract Recent evidence of the occurrence of beidellite in many soils around the world necessitates a better understanding of the role of charge location on the colloidal behavior of this smectite as compared to the more frequently studied montmorillonites. Clay suspension stability and sorption of an organic polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural consequences of porphyrin tautomerization. Molecular structure of a zinc isoporphyrinK. M. Barkigia, M. W. Renner, H. Xie, K. M. Smith, and J. FajerCite this: J. Am. Chem. Soc. 1993, 115, 17, 7894–7895Publication Date (Print):August 1, 1993Publication History Publ…
X-ray θ scans and high-resolution transmission electron microscopy (HRTEM) imaging indicate that the calcite of sea urchin spines and skeletal plates forms in mosaic crystals. Both coherent and incoherent boundaries were observed between slightly misaligned crystallites. Small domains show an ordered superstructure. U…
The arsenic pressure dependence of surface diffusion of Ga adatoms in molecular beam epitaxy (MBE) on (111)B-(001) mesa-etched substrates was investigated by means of in situ scanning microprobe reflection high-energy electron diffraction (µ-RHEED). It was observed for the first time that the direction of Ga adatom mi…
Abstract The mechanism of intumescence is studied in mixtures of ammonium polyphosphate (APP) with several polycondensates as a part of a systematic study of intumescent fire retardants. It is shown that APP reacts on heating with the polycondensate to form a precursor of the intumescent char which is obtained on furt…
Photodynamic therapy (PDT) of cancer is a modality that relies upon the irradiation of tumors with visible light following selective uptake of a photosensitizer by the tumor tissue. There is considerable emphasis to define new photosensitizers suitable for PDT of cancer. In this study we evaluated six phthalocyanines…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIs hole transfer involved in metalloporphyrin-catalyzed epoxidation?Taisun Kim, Gholam A. Mirafzal, Jianping Liu, and Nathan L. BauldCite this: J. Am. Chem. Soc. 1993, 115, 17, 7653–7664Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Publ…