Materials Literature
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Abstract The forces between muscovite mica surfaces have been measured in water and in NaCl and CaCl 2 solutions. Above a critical electrolyte concentration, strong, short‐range repulsive forces arise which are not predicted by DLVO theory. These forces have been identified as hydration forces and have an oscillatory…
Transmission electron microscopy studies have recently shown that low-energy cluster-beam deposition allows the formation of higher-quality films compared with the classical molecular-beam deposition. This work presents preliminary results obtained with antimony deposits.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFacile regioselective ligand substitution for the in-plane bridging acetates in octakis(.mu.-acetato-O,O')tetraplatinum(II)Tadashi Yamaguchi, Yoichi Sasaki, Akira Nagasawa, Tasuku Ito, Nobuaki Koga, and Keiji MorokumaCite this: Inorg. Chem. 1989, 28, 24, 4311–4312Publication…
Abstract An extensive study of the coagulation of cellulose from cellulose/ammonia/ammonium thiocyanate solutions is presented. The effect of major variables upon the coagulation process for cellulose solutions is reported. Microscopic observations of the moving boundary associated with the coagulation were performed…
Tetragonal zirconia doped with 3 mol% Er 2 O 3 was prepared by the gel‐precipitation wet‐chemical method. The compaction response of ultrafine (∼8.5 nm), calcined, deagglomerated powders was studied. Initial sintering was studied using both isothermal and nonisothermal techniques, and an activation energy of 270 ± 40…
The transient ionic current in a ferroelectric liquid crystal (FLC) cell was measured as a function of applied voltage at different temperatures. The measured current shows a delay peak which decays rapidly to a steady-state value. The steady-state current exhibits a thermal activated behavior with an activation energ…
A technique is developed to measure the transition speed from a field-induced ferroelectric to an antiferroelectric phase upon the release of the applied electric field in the antiferroelectric ceramics. The transition speeds of three members in the antiferroelectric (Pb,La)(Zr,Ti,Sn)O3 family were investigated. Switc…
BaTi 4 O 9 powder prepared by calcining BaCO 3 and TiO 2 powders was sintered to over 97% of theoretical density. Less than 5% Ba 2 Ti 9 O 20 occurred as a second phase in “pure” BaTi 4 O 9 , and Al 2 O 3 impurities from processing formed isolated hollandite (∼BaAl 2 Ti 6 O 16 ) grains, which were identified by fringe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of completely fixed porphyrin-quinone compounds and the mutual orientation effect on electron transferYoshiteru Sakata, Shuichi Nakashima, Yasushi Goto, Hitoshi Tatemitsu, Soichi Misumi, Tsuyoshi Asahi, Masaaki Hagihara, Shinya Nishikawa, Tadashi Okada, and Noboru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of mesophase transitions of thermotropic copolyesters. 2. Two transition processesStephen Z. D. Cheng, James J. Janimak, Anqiu Zhang, and Zhenglong ZhouCite this: Macromolecules 1989, 22, 11, 4240–4246Publication Date (Print):November 1, 1989Publication History Publ…
Abstract Reduction of 3,5,7,7,10,12,14,14-octamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene (Me8[14]diene) with sodium borohydride yields three diastereomeric Me8[14]anes. These diastereomers can be separated through fractional crystallization from xylene. The structure of these isomers has been established on the…
Abstract Der Einfluß von gasförmigem HCl und Stickstoff auf die Hochtemperatur‐Korrosion in Atmosphären mit niedrigem Sauerstoffpartialdruck wurde untersucht. Untersuchungen mit der Legierung Fe‐20Cr in He‐H 2 ‐H 2 O‐HCl‐Atmosphären bei 1173 K unter Bedingungen, bei denen keine kondensierten Chloride gebildet werden,…
We have studied the effects of perpendicular electric and magnetic fields on a liquid-crystal sample aligned between glass plates. One field is applied to stabilize the initial alignment, and the other is applied in order to drive the transition; the field and initial alignment directions define six possible geometrie…
Abstract Asymmetrically substituted, liquid‐crystalline phthalocyanines were synthesized. They contain one methoxy, six dodecyloxy and one acryloyloxy‐ or methacryloyloxydodecyloxy groups. The latter functions were polymerized under free radical conditions to give polymers with molecular weights between 9000 and 47000…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect observation of .eta.2-arene complexes of [(C5Me5)Rh(PMe3)]William D. Jones and Lingzhen DongCite this: J. Am. Chem. Soc. 1989, 111, 23, 8722–8723Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989htt…
The physical mechanism of photostimulated luminescence (PSL) of RbBr:Tl, resulting from x-ray irradiation, has been investigated. Spectroscopic methods have been utilized to identify the bromine F center as the occupied electron trap. By means of absorption studies the charge state of the dopant Tl was found to be mon…
A mathematical model for the initiation of crevice corrosion on 304 stainless steel in was developed. The central concept is that thiosulfate ions, formed by dissolution of inclusions and trapped within the crevice, act in concert with chloride ions to cause passivity breakdown when their concentrations exceed critica…
Recently, a tiling derived from the well-known 2D quasi-periodic octagonal tiling has been introduced. In this letter, we show that in the framework of a tight-binding model, the electronic spectrum of this nontrivial tiling can be derived. The integrated density of state is singular and can be a devil staircase, ther…
In the past, it has been shown that reasonably good estimates of critical cooling rates for glass formation could be obtained by computing the cooling curve which just passes through the nose of a T‐T‐T (time—temperature—transformation) diagram. Also, it has been noted that critical cooling rates found by this procedu…
The authors discuss the modeling and fabricating miniature, vacuum, field-emission diodes and triodes for use in electronics in hazardous environments. They are micrometer-sized devices that are fabricated on a semiconductor wafer using integrated-circuit fabrication techniques and that use field emission rather than…