Materials Literature
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Caesium accumulation by Chlorella salina, from buffer (pH 8.0) supplemented with 50 μm-CsCl and 137Cs, continued for approximately 15 h and displayed first-order kinetics, indicating a single rate-limiting transport process. Efflux of Cs+ from Cs+-loaded cells occurred in two distinct phases: a rapid initial loss, rep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanion-supported, atomically dispersed transition-metal precatalyst [(1,5-COD)Ir.cntdot.P2W15Nb3O62]8-: direct oxygen-17 NMR evidence for Ir-ONb2 bonding and for a C3v average symmetry, iridium-to-polyoxoanion support interactionMatthias Pohl and Richard G. FinkeCite t…
We present a rheological study of the gel transition in silica gels resulting from the hydrolysis-condensation of a silicon alkoxide. The complex shear modulus is measured in a large frequency range (${10}^{\mathrm{\ensuremath{-}}2--}$${10}^{2}$ rad/s). The exponents for the viscosity s=0.7\ifmmode\pm\else\textpm\fi{}…
Polyoxometalate complexes are attractive precursors for the preparation of new radical‐ion salts based on π‐electron organic donors of the tetrathiafulvalene (TTF) type, the most widely used molecules in the synthesis of organic conductors and superconductors. The well‐defined sizes and shapes of polyoxometalates, as…
Influence of the atmosphere on the crystal structure of thin tungsten films produced by the evaporation method in vacuum was studied. While the crystal structure of the films produced in a high vacuum ( e.g. , 10 -6 Pa) was bcc, the films took on an A15 structure in oxygen and nitrogen atmospheres ( e.g. , 10 -4 Pa).…
A spray pyrolysis method has been used to deposit ZnO films on polycrystalline alumina substrates. The precursor is dissolved in aqueous solutions with different pH values. Depending on the pH, the growth rate either is low (less than 0.2 μm·h ‐1 ) for pH ≤3.1 and pH ≥4.7 or has significant values (>1.5 μm·h ‐1 ) f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutral substrate complexation by an "expanded porphyrin"Jonathan L. Sessler, Tarak D. Mody, and Vincent LynchCite this: J. Am. Chem. Soc. 1993, 115, 8, 3346–3347Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystalline triptycene derivativesSophie NorvezCite this: J. Org. Chem. 1993, 58, 9, 2414–2418Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/doi/10.1021/jo00061a012https://doi.org/…
Abstract Three kinds of supported cerium oxide catalysts were prepared by an impregnation and a sol–gel technique using aluminium tri-isopropoxide (AIP) and cerium(III) nitrate dissolved in ethylene glycol. One is cerium dioxide supported on alumina, and others are finely-divided nonstoichiometric cerium oxide and cer…
13C proton decoupled cross-polarization magic-angle spinning nmr spectra of lysozyme are reported as a function of hydration. Increases in hydration level enhance the resolution of the spectra, particularly in the aliphatic region, but has no significant effect on either the rotating frame proton spin-lattice relaxati…
The effects of operating conditions on membrane ultrafiltration of dextran T500 solution in a hollow-fiber cartridge made of polysulfone have been investigated experimentally. The experimental data agree with the correlation equation based on the resistance-in-series model. It is believed that this model would also be…
A study of the dielectric response as a function of frequency (${10}^{2--}$${10}^{6}$ Hz) and temperature (4.2--300 K) in ceramic and c-axis-oriented single-crystal samples of ${\mathrm{PrBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{\mathit{x}}$ reveals dielectric constants >${10}^{3}$ at low frequencies in both case…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrequency-resolved faradaic processes in polypyrrole films observed by electromodulation techniques: electrochemical impedance and color impedance spectroscopiesT. Amemiya, K. Hashimoto, and A. FujishimaCite this: J. Phys. Chem. 1993, 97, 16, 4187–4191Publication Date (Print…
Abstract The effect of structure on the sorption kinetics of water and of various organic solutes into polyimide (PMDA‐ODA) thin films was studied. The major techniques employed include measurements of sorption kinetics, density, and dielectric relaxation. More solute uptake, lower densities and higher diffusivities w…
Abstract To elucidate the effect of tin compounds in the ring‐opening polymerization of lactides and lactones, D,L‐dilactide was taken as an example, and its reaction with different tin compounds at a molar ratio of 1:1 as well as the polymer formation and degradation in dependence of its concentration has been invest…
Author: Kannan, R. M. et al.; Genre: Journal Article; Issued: 1993; Title: RHEOLOGY OF SIDE-GROUP LIQUID-CRYSTALLINE POLYMERS - EFFECT OF ISOTROPIC<br/> NEMATIC TRANSITION AND EVIDENCE OF FLOW-ALIGNMENT
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel controlled luminescence of tris(2,2'-bipyridine)ruthenium(II) intercalated in a fluortetrasilicic mica with poly(vinylpyrrolidone)Makoto Ogawa, Misako Inagaki, Nobuhiro Kodama, Kazuyuki Kuroda, and Chuzo KatoCite this: J. Phys. Chem. 1993, 97, 15, 3819–3823Publication…
A new type of photochromic compounds, diarylethene derivatives, has been developed for optical data storage media. The photochromic dye - polymer media had read-out stability more than 106 times, and write/erase cycles could be repeated 3 × 103 times without loss of performance.
In this paper we describe the solvent extraction behaviour of three calixarene-type cyclophanes towards trivalent lanthanides Ln3+ (Ln = La, Nd, Eu, Er and Yb). By using p-tert-butylcalix/6/arene hexacarboxylic acid (LI), the lanthanides were extracted from the aqueous phase at pH 2 to 3.5 into chloroform according to…
The maximum-entropy method (MEM) is a very powerful method for deriving accurate electron-density distributions from X-ray diffraction data. The success of the method depends on the fact that the electron density is always positive. In order to analyse neutron diffraction data by the MEM, it is necessary to overcome t…