Materials Literature
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Abstract This study was conducted to determine if a single unbuffered salt extractant for exchangeable bases and Al could be used in place of a buffered salt extractant for exchangeable bases and an unbuffered salt extractant for exchangeable Al. Barium chloride and a mixed NH 4 Cl‐BaCl 2 extractant were compared with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared study of carbon monoxide hydrogenation over rhodium/ceria and rhodium/silica catalystsJ. C. Lavalley, J. Saussey, J. Lamotte, R. Breault, J. P. Hindermann, and A. KiennemannCite this: J. Phys. Chem. 1990, 94, 15, 5941–5947Publication Date (Print):July 1, 1990Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ab initio investigation of copper complexes with supershort copper-copper distancesChristoph. Koelmel and Reinhart. AhlrichsCite this: J. Phys. Chem. 1990, 94, 14, 5536–5542Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissu…
Submicrometer powders of various Pb‐based perovskites, including PbTiO 3 , PbZrO 3 , Pb(Zr 0.53 Ti 0.47 )O 3 , and Pb(Mg 1/3 Nb 2/3 )O 3 were prepared by a reactive calcination process. Using only reagent‐grade raw materials and conventional processing techniques, highly reactive powders were produced by reacting the…
The main features of the Cooled Grating Spectrometer (CGS4), for the United Kingdom Infrared Telescope (UKIRT), are described. The CGS4 for use at 1 to 5 microns is designed to fully utilize foreseeable arrays and to take maximum advantage of the solid imaging detectors. The spectrometer can use low dispersion first o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis and characterization of a new bacterial copolyester of 3-hydroxyalkanoates and 3-hydroxy-.omega.-chloroalkanoatesYoshiharu Doi and Chikara AbeCite this: Macromolecules 1990, 23, 15, 3705–3707Publication Date (Print):July 1, 1990Publication History Published onli…
Tm(DOTP)5-, the thulium(III) complex of 1,4,7,10-tetraazacyclododecane-N,N',N',N'''-tetra(methylenephos p hon ate), is introduced as a 23Na+ shift agent for use in discrimination of the NMR resonances of intra- and extracellular 23Na+ ions in perfused rat hearts. The novel shift agent is directly compared to the widel…
The grain‐growth behavior of Al 2 O 3 compacts with small contents (≤10 wt%) of various liquid‐forming dopants was studied. Equiaxed and/or elongated grains were observed for the following dopants: MgO, CaO, SiO 2 , or CaO + TiO 2 . The platelike grains, defined as the abnormal grains larger than 100 μm with an aspect…
Real-time monitoring of the corona-poling process that is used to create a bulk second-order nonlinear-optical susceptibility was accomplished by observing electrochromic shifts and intensity decreases of charge-transfer absorption bands in both dye-doped and covalently functionalized polymer films. By measuring small…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBioconjugate ChemistryCite this: Anal. Chem. 1990, 62, 13, 746APublication Date (Print):July 1, 1990Publication History Published online30 May 2012Published inissue 1 July 1990https://doi.org/10.1021/ac00212a758RIGHTS & PERMISSIONSArticle Views8Altmetric-Citations-LEARN ABOU…
13 C solid-state NMR spectra (CP/MAS) were recorded for mannan polymorphs: mannan I ("ivory nut") and mannan II (Codiumfragile). These pure mannans, poly-β-(1 → 4) mannopyranose, show a single resonance for each carbon of the chemical repeat unit. This is the expected result based on the crystalline P2 1 2 1 2 1 and 1…
Experiments have been carried out to investigate direct contact condensation of saturated vapor bubbles introduced into a quiescent subcooled water environment. The experiments were performed for a range of pressures from atmospheric to 1 MPa, for subcooling from 10 to 70 K, and for initial bubble diameters of about 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinated silicon anions: synthesis and reactivityJean Louis Brefort, Robert J. P. Corriu, Christian Guerin, Bernard J. L. Henner, and Wong Wee Choy Wong Chi ManCite this: Organometallics 1990, 9, 7, 2080–2085Publication Date (Print):July 1, 1990Publication History Pu…
Abstract The birefringence distributions in injection‐molded Compact Discs (CD) are determined in radial and tangential cross‐sections and interpreted in terms of the process. The influence of processing conditions is discussed in several examples. It is shown that despite the high birefringence level the retardation…
Some of the title compounds have been found to exhibit ferroelectricity at room temperature. Their structure types can be classified in three series according to the cations coordination number (CN) and size: 1.- single cation with CN 4: olivine and glaserite; 2.- two cations with CN 4: Beryllonite and stuffed tridymi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCleavage of poly(diorganosiloxanes) by trimethylaluminumAllen W. Apblett and Andrew R. BarronCite this: Organometallics 1990, 9, 7, 2137–2141Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 July 1990https://pubs.acs.org/d…
Monodispersed spherical β‐SiC powder was synthesized by heating spherical gel powder derived from the hydrolysis of a mixture of phenyltriethoxysilane and tetraethyl orthosilicate. The solution was prepared in a beaker and hydrolyzed by NH 4 OH without stirring. The monodispersed spherical gel powder of submicrometer…
1. Summary The structure of native poly(3-hydroxybutyrate) (PHB) granules of Alcaligenes eutrophus was characterized in wet cells or wet granules by analysis of X-ray diffraction. The PHB granules in intact cells were completely amorphous, but became crystalline after treatment with alkali or sodium hypochlorite. The…
Diamonds were reproducively synthesized from graphite in the presence of Na 2 SO 4 , MgSO 4 , CaSO 4 ·1/2H 2 O, Mg(OH) 2 and Ca(OH) 2 at high pressure of 7.7 GPa and a temperature of 2150°C. Although starting graphite was completely transformed to diamond in the presence of the sulfates or hydroxides, no transformatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic behavior of linear chain electron-transfer complexes. Decamethylferrocene electron-transfer salts of 2,5-disubstituted-7,7,8,8-tetracyano-p-quinodimethanes. Magnetic characterization of [Fe(C5Me5)2].cntdot.+[TCNQI2].cntdot.- and structures of [TCNQI2]n- (n = 0,…