Materials Literature
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A study of the solution photophysical and photoredox properties of ReCl62- and ReBr62- is reported. The solutions are phosphorescent at room temperature, with emission maxima (lifetimes) of 1340 nm (80 ns) and 1380 nm (40 ns) for (Bu4N)2[ReCl6] and (Bu4N)2[ReBr6], respectively, in CH3CN. The phosphorescences are assig…
Abstract The surfaces of polymethylmethacrylate (PMMA) intraocular lenses (IOL) modified by treatment in a plasma containing various fluorine‐containing gases were studied by surface analytical techniques. The hydrophobicity imparted to the lens surface was monitored by water contact angle measurements and the degree…
The paper presents a kinetic approach to the problem of fusion of cracks. A kinetic equation for the size distribution function of cracks is derived. By division of all cracks into three groups a set of three simple equations is obtained. From a numerical analysis of the simple model we conclude that periodic solution…
Communciation: Mesogenic disc‐like compounds possessing a high permanent electric dipole moment are of interest as they offer the possibility of orientating columnar mesophases. The structure (schematically shown in the figure) which is similar to the well‐known toy “Diabolo”, and phase behavior of only the second exa…
Abstract Photochromic spiroindolinobenzothiopyrans having a methacryloxymethyl group have been prepared and their colored forms were demonstrated to be a zwitterionic structure on the basis of the spectroscopic data.
<div class="htmlview paragraph">The isostatic strength of porous cordierite ceramic monoliths plays an important role during canning and subsequent operation of automotive catalysts. Its value depends on wall porosity, cell geometry, skin thickness and morphology, monolith size and contour, and substrate/washcoa…
Epitaxie par evaporation sous vide de tetraphenylporphyrine (H 2 TPP). Cristallisation dans le systeme monoclinique avec a=1,20, b=1,90, c=1,47 nm, β=91 o et Z=4. Mise en evidence de la croissance de cristallites rectangulaires suivant quatre directions. Suggestion d'une orientation de la molecule plane H 2 TPP presqu…
Abstract Selective dehydrogenation of 2-propanol was performed with a suspended nickel fine-particle catalyst at high activity under refluxing conditions. The isotope effects, kH⁄kD for (CH3)2CDOH and (CD3)2CDOD were found to be 2.56 and 2.69, respectively, in contrast to 1.68 for (CH3)2CHOD, suggesting that the C–H b…
The synthesis of the β and γ forms of M(Ph 2 PO 2 ) 2 where M = Co and Mn are described and the compounds are characterized by infrared spectroscopy, differential scanning calorimetry, X-ray powder diffraction, and low-temperature (2–80 K) magnetic susceptibility studies. Single crystal X-ray diffraction studies are r…
A method is described using the fuzzy comprehensive evaluation technique to predict fabric hand. A fuzzy transformation matrix R s is established for subjective assessment of light weight dress fabric handle. Another aspect is the development of a weighted factor vector A s for subjective analysis, which was deduced f…
Oxygen and oxidation effects in powder were investigated in order to improve luminance of thin‐film electroluminescent devices. XPS analysis revealed that the powder surface was oxidized by the adsorption of water, giving the surface products and free S. Adsorption of water on the surface proceeded rapidly when expose…
A thin fluid drop is at rest on a plane vertical surface, supported against gravity by surface tension. The perimeter of the drop is required to lie on a given closed curve, upon which the contact angle is arbitrary. If the drop is of sufficient volume, it can wet the whole area interior to this curve. However, for an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(aryl ether amides)James L. HedrickCite this: Macromolecules 1991, 24, 3, 812–813Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February 1991https://pubs.acs.org/doi/10.1021/ma00003a027https://doi.org/10.1021/ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption sites for water on graphite. 5. Effect of hydrogen-treatment of graphiteKazuhisa Miura and Tetsuo MorimotoCite this: Langmuir 1991, 7, 2, 374–379Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissue 1 February 199…
Deuterium NMR spectroscopy of C6D6, added as a probe to compound 1, shows the formation of an uniaxial columnar mesophase, with domain directors perpendicular to the magnetic field. Spectral patterns at various temperatures are interpreted in terms of slow equilibrium between two solvent sites placed respectively betw…
Spin dynamics of electrons in n-type ${\mathrm{Cd}}_{0.95}$${\mathrm{Mn}}_{0.05}$Se near the metal-to-insulator transition are probed by means of inelastic-light-scattering measurements as a function of magnetic field up to 8 T and temperature down to 0.25 K. The observed Raman spin-flip scattering line is demonstrate…
The traceability routes for the calibration of brachytherapy sources supplied by Amersham International plc were recently summarized (Rossiter 1990) following continued interest in this topic by users. Such calibrations have depended on an ionometric comparison of the source output with one of a set of 60 Co reference…
The methods of linear and circular statistics are used to derive summary descriptors for a unimodal distribution of torsion angles (r;). The arithmetic methods of normal linear statistics are complicated by the phase restriction - 180 < 7 i ~--- 180 °. Phase adjustments must be made to generate a correct arithmetic me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnnealing and reorganization of sulfonated polyethylene films to produce surface-modified films of varying hydrophilicityDavid E. Bergbreiter and Konrad KabzaCite this: J. Am. Chem. Soc. 1991, 113, 4, 1447–1448Publication Date (Print):February 1, 1991Publication History Publ…
Abstract The surface free energy components of clay-organic complexes were determined to assess to what extent an organic adsorbate modified the surface properties of the mineral, insofar as the stability of soil aggregates is concerned. Adsorption isotherms for two synthetic, humic acid-like polymers were determined…