Materials Literature
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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…
Abstract Polyfunctional chloroformates were applied to the polymerization of 2‐phenyl‐2‐oxazoline and 2‐methyl‐2‐oxazoline. The use of a trifunctional initiator, viz. the chloroformate of 2,2‐bis(hydroxymethyl)‐1‐butanol, led to three‐arm star polymers of 2‐oxazolines. Two macromolecular initiators, viz. poly(ethylene…
Clay mineral relative abundances in approximately 450 samples from cores recovered during ODP Leg 117 in the Arabian Sea have been used to examine the paleoclimatic, paleoenvironmental, and tectonic histories of the Indus Fan, Owen Ridge, Oman margin, and adjacent continental source regions. Geographic variations in t…
An electrically erasable memory device is fabricated using a conducting polymer and solid polymer electrolyte. The conductivity of the memory channel consisting of the conducting polymer is controlled by electrochemical doping through the counter (writing) electrode. The channel conductivity was varied by the number o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonaqueous electrochemistry of polypyrrole/polystyrenesulfonate composite films: voltammetric, coulometric, EPR, and a.c. impedance studiesC. Michael Elliott, Alan B. Kopelove, W. John Albery, and Zheng ChenCite this: J. Phys. Chem. 1991, 95, 4, 1743–1747Publication Date (Pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state deuteron and proton NMR of guest and host motions in the Hofmann-type and related benzene clathratesShinichi Nishikiori, Christopher I. Ratclife, and John A. RipmeesterCite this: J. Phys. Chem. 1991, 95, 4, 1589–1596Publication Date (Print):February 1, 1991Public…
A potentiostatic pulse technique was used to study the ingress of hydrogen in titanium (pure and grade 2) in an acetate buffer. Hydrogen ingress did not occur with pure titanium, indicating that the surface oxide is an effective barrier to hydrogen entry. In contrast, the data for Ti grade 2 (UNS(1) R50400) were shown…