Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman spectroscopy of iron(II) superstructured porphyrins: influence of porphyrin distortions on carbonyl and dioxygen ligand dissociationAlain Desbois, Michel Momenteau, and Marc LutzCite this: Inorg. Chem. 1989, 28, 5, 825–834Publication Date (Print):March 1, 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction and Raman studies of zinc(II) chloride hydrate melts, ZnCl2.rH2O (r = 1.8, 2.5, 3.0, 4.0, and 6.2)Toshio Yamaguchi, Shunichi Hayashi, and Hitoshi OhtakiCite this: J. Phys. Chem. 1989, 93, 6, 2620–2625Publication Date (Print):March 1, 1989Publication History…
Chemically stabilized β‐cristobalite has been synthesized in the Na 2 O‐Al 2 O 3 ‐SiO 2 and CaO‐Al 2 O 3 ‐SiO 2 systems. Highly reactive chemical precursors in the gel and zeolitic state are thermally transformed to stabilized β‐cristobalite crystalline solutions in each system. High‐temperature X‐ray diffraction, pha…
The thermodynamics of the enzymatic hydrolysis of cellobiose, gentiobiose, isomaltose, and maltose have been studied using both high pressure liquid chromatography and microcalorimetry. The hydrolysis reactions were carried out in aqueous sodium acetate buffer at a pH of 5.65 and over the temperature range of 286 to 3…
Models incorporating different levels of sophistication are presented for predicting the surge distribution in motor stator windings. Results predicted by these models have been validated against experimental results. Simple models, which provide insight into the relevant mechanisms, are presented for estimating the i…
Abstract The distribution of Fe 3+ -kaolinite, Al-goethite and Al-hematite and their contents of Fe and Al in bauxites and ferricretes are controlled by water activity, dissolved silica activity, temperature and particle size. The proposed model, based on ideal solid-solution equilibria in the Fe 2 O 3 -Al 2 O 3 -SiO…
Factors concerning the stabilization of the tetragonal and cubic phases, metastable at room temperature, with respect to the monoclinic stable phase in ultrafine zirconia powders are studied. The importance of Na + ions in the initial zirconia amorphous gel in obtaining a cubic phase has been confirmed. By an X‐ray di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxide ion conductivity in Ln5Mo3O16+x) (Ln = La, Pr, Nd, Sm, Gd; x .apprx. 0.5) with a fluorite-related structureM. Tsai, Martha Greenblatt, and W. H. McCarrollCite this: Chem. Mater. 1989, 1, 2, 253–259Publication Date (Print):March 1, 1989Publication History Published onli…
Abstract Differential Scanning Calorimetry (DSC) is a popular method for the characterization of the cure kinetics of thermosetting materials. The experiments may be carried out under isothermal or temperature program modes. Several authors have pointed out the fact that the kinetic rate expressions for non‐isothermal…
Abstract A simple model of filler dispersion has been used to approximate particle spacing and the portion of rubber that is restricted as a result of particulate reinforcement. For N330 black, which has an equivalent radius of 20.2 nm, the critical concentration (in SBR of M w =344 000 ) for coherent carbon-gel forma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in semiquinone complexes of iron. Structural and magnetic properties of tris(3,5-di-tert-butylsemiquinonato)iron(III) and tetrakis(3,5-di-tert-butylsemiquinonato)tetrakis(3,5-di-tert-butylcatecholato)tetrairon(III)Steven R. Boone, Gordon H. Pur…
Magnetic and magnetoelectric measurements were made on a single crystal of ferroelectric PbFe0.5Nb0.5O3. It was revealed that PbFe0.5Nb0.5O3 has a weak ferromagnetic moment and linear magnetoelectric effect below a transition point T m c of approximately 9 K. The magnetic class below and above T m c was determined to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and proton NMR studies of the electronic and magnetic properties of low-spin ferric isocyanide tetraphenylporphyrin complexesG. Simonneaux, F. Hindre, and M. Le PlouzennecCite this: Inorg. Chem. 1989, 28, 5, 823–825Publication Date (Print):March 1, 1989Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical rearrangements of stable silenesKim M. Baines, A. G. Brook, R. R. Ford, P. D. Lickiss, A. K. Saxena, W. J. Chatterton, J. F. Sawyer, and B. A. BehnamCite this: Organometallics 1989, 8, 3, 693–709Publication Date (Print):March 1, 1989Publication History Publishe…
ABSTRACT We studied the hypothesis that diatom immigration abilities are related to their fitness for colonizing stream substrates. Diatom abundances on artificial substrates exposed for 24 h (the measure of immigration rate) and abundances of stream plankton were determined in six habitats. Diatom immigration varied…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the 2:1 charge-transfer salt of decamethylferrocene and perfluoro-7,7,8,8-tetracyano-p-quinodimethane: [[Fe(C5Me5)2]+.cntdot.]2[TCNQF4]2-. The electronic structure of [TCNQF4]n (n = 0, 1-, 2-)David A. Dixon, Joseph C. Calabrese, and Joel S.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn analysis of phase separation kinetics of model polyurethanesHan Sup Lee and Shaw Lind HsuCite this: Macromolecules 1989, 22, 3, 1100–1105Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https://pubs.acs.org/…
Abstract The effect of molecular weight distribution on the Theological and mechanical properties of a series of polypropylenes is evaluated. The polypropylenes tested were produced by controlled chemical degradation in a single‐screw plasticating extruder. Measured properties include shear, extensional and intrinsic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight scattering and heterogeneities in low-loss poly(methyl methacrylate) glassesYasuhiro Koike, Norihisa Tanio, and Yasuji OhtsukaCite this: Macromolecules 1989, 22, 3, 1367–1373Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of cadmium selenide molecular clusters in zeolite Y: EXAFS and x-ray diffraction studiesKarin Moller, Mike M. Eddy, Galen D. Stucky, Norman Herron, and Thomas BeinCite this: J. Am. Chem. Soc. 1989, 111, 7, 2564–2571Publication Date (Print):March 1, 1989Publicat…