Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase separation in diblock-copolymer melts: ordering of micellesA. N. SemenovCite this: Macromolecules 1989, 22, 6, 2849–2851Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https://pubs.acs.org/doi/10.1021…
Nuclear respiratory-defective mutants of Saccharomyces cerevisiae have been screened for lesions in the mitochondrial alpha-ketoglutarate dehydrogenase complex. Strains assigned to complementation group G70 were ascertained to be deficient in enzyme activity due to mutations in the KGD1 gene coding for the alpha-ketog…
Are colloids large clusters? Both can be stabilized by simple low‐molecularweight ligands, as was demonstrated by complexation of gold colloids with the water‐soluble phosphane Ph 2 PC 6 H 4 SO 3 Na. This approach allows not only the study of gold colloids in aqueous solution at any desired concentration, but also the…
The title compound (Phen* =phenanthroline derivative) contains the magic number of 309 Pt atoms. In contrast to one-, two-, and five-shell clusters, four-shell clusters were previously unknown. Thus, the preparation of 1 helps bridge the gap between complexes and bulk metals. The Pt atoms in 1, like those in metallic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiolytic production and properties of ultrasmall cadmium sulfide particlesDavid Hayes, Olga I. Micic, M. T. Nenadovic, V. Swayambunathan, and Dan MeiselCite this: J. Phys. Chem. 1989, 93, 11, 4603–4608Publication Date (Print):June 1, 1989Publication History Published onlin…
This experiment illustrates the formation of tris(phenanthroline)cobalt complexes in the +2 and +3 oxidation states, the effect of coordination on reactions of the ligand, and the use of a ligand displacement reaction in recovering the transformed ligand.
The need for improved coatings on low‐density reusable surface insulation (RSI) materials used on the space shuttle has stimulated research into developing tougher coatings. The processing of a new porous composite “coating” for RSI called toughened unipiece fibrous insulation is diseassed. Characteristics including p…
A bacterial strain, Pseudomonas sp. strain NK87, that can use 6-aminohexanoate-cyclic dimer as the sole source of carbon and nitrogen was newly isolated from wastewater of a factory which produces nylon-6. Two responsible enzymes, 6-aminohexanoate-cyclic-dimer hydrolase (P-EI) and 6-aminohexanoate-dimer hydrolase (P-E…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of polynitrocyclobutane derivativesT. G. Archibald, L. C. Garver, K. Baum, and M. C. CohenCite this: J. Org. Chem. 1989, 54, 12, 2869–2873Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https://pubs.ac…
The transition of copper oxide thin films from CuO to ${\mathrm{Cu}}_{2}$O during vacuum annealing has been studied by transmission electron microscopy and Rutherford backscattering spectroscopy. Dark field images show that isolated and large ${\mathrm{Cu}}_{2}$O grains emerge from the small CuO grain matrix. The abru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of the iron(III)-catalyzed autoxidation of sulfur(IV) oxides in aqueous solution. 2. Decomposition of transient iron(III)-sulfur(IV) complexesJochen Kraft and Rudi Van EldikCite this: Inorg. Chem. 1989, 28, 12, 2306–2312Publication Date (Print):June 1,…
We discuss theoretically the possibility of a spontaneous nematic splay phase for polar nematogens. This novel liquid crystal phase is similar to the cholesteric phase for chiral nematogens (spontaneous twist), since it is spatially inhomogeneous and breaks translational symmetry, and to the cholesteric blue phases, s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoreactivity of .sigma.-bonded metalloporphyrins. 2. Germanium porphyrin complexes with .sigma.-bonded alkyl, aryl, or ferrocenyl groups. Intramolecular quenching of porphyrin excited triplet states by linked ferroceneG. B. Maiya, J. M. Barbe, and K. M. KadishCite this: I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR study of manganese(II) and copper(II) in single crystals of the spin-crossover complex hexakis(1-propyltetrazole)iron(2+) tetrafluoroborate(1-)A. Ozarowski and B. R. McGarveyCite this: Inorg. Chem. 1989, 28, 12, 2262–2266Publication Date (Print):June 1, 1989Publication H…
Abstract This study examined the moisture absorption and other properties of nylon‐6,6 as a function of mold temperature and annealing effects. Moisture absorption was seen to decrease as the temperature of molding and annealing increased with a predictable effect on mechanical and thermal properties: namely, increase…
The vacancy diffusion flux, driven by the neck growth curvature (1 /ρ) which contributes to conventional sintering of a powder compact, is theoretically compared with that arising from thermal diffusion, driven by the temperature gradient (grad T/T) during the final stage of sintering. Under conditions experienced in…
The improvement of charge storage with annealing, the use of different cooling rates, and stretching in polypropylene (PP) and polyethylene (PE) is discussed. In annealed PP and PE storage increases linearly with both crystallinity and crystallite size. The half-value charge decay temperature can be used as a measure…
Abstract Al-rich di, trioctahedral chlorite exists as the species cookeite and sudoite. Di,dioctahedral chlorite exists as the species donbassite. Cookeite has essential Li in its structure, sudoite has essential Mg, and donbassite has only small amounts of either element. To date, sudoite has been reported to have on…
An equation for the half width of an adiabatic shear band formed under combined stresses is derived. The importance of strain rate, stress, temperature rise, and thermal conductivity is described. Confirmation is found for the proposition that shear band width is independent of stress state and this is confirmed by co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic quenching of the metal-to-ligand charge-transfer excited state of Cu4I4(pyridine)4. Exciplex formation and self-quenchingKevin R. Kyle and Peter C. FordCite this: J. Am. Chem. Soc. 1989, 111, 13, 5005–5006Publication Date (Print):June 1, 1989Publication History Publi…