Materials Literature
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Pulsed laser deposition in ultrahigh vacuum (UHV) was applied to the epitaxial growth of CeO 2 film on Si(001). Although the direct deposition of CeO 2 (001) on Si(001) was unsuccessful, the desired epitaxy was achieved by inserting the growth of a SrTiO 3 layer. The formation of a CeO 2 (001)//SrTiO 3 (001)//Si(001)…
Synopsis Some previously unreported fine variations in the form of normal hairs are described as they are observed in the scanning electron microscope (SEM). They all arise in the course of surface frictional wear and the chipping away of the hair surface scale edges and include remanent surface impressions of cuticle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of 21-thia-5,20-diphenyl-10,15-bis(p-nitrophenyl)-porphyrin and 21,23-dithiatetraphenylporphyrin. The influence of sulfur on the .pi.-delocalization patternLechoslaw Latos-Grazynski, Jerzy Lisowski, Ludmila Szterenberg, Marilyn M. Olmstead, an…
A synthesis of theories for the orientational entropy and excluded volume interaction for persistent chain polymers at intermediate degrees of chain flexibility, when extended to liquidlike densities, is shown to satisfactorily account for experimental data on the volume fractions of polymer at coexistence of isotropi…
Eleven samples from a range of volcanic ash soils (Andisols or Andic Dystro-chrepts) and one sample from a paddy soil formed in alluvium (Inceptisol) have been investigated for the presence of ferrihydrite using dissolution analysis and differential X-ray diffraction (DXRD). The presence of ferrihydrite in six samples…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRemarkable solvent effect on the shape-selective oxidation of olefins catalyzed by iron(III) porphyrinsYoshihito Watanabe, Kazuya Yamaguchi, Isao Morishima, Katsuomi Takehira, Masao Shimizu, Takashi Hayakawa, and Hideo OritaCite this: Inorg. Chem. 1991, 30, 12, 2581–2582Publ…
It has been found that the reaction rate between alumina and carbon in nitrogen can be considerably increased by using Al(OH)3–C mixtures instead of α Al2O3–C mixtures. The C/Al(OH)3 ratio in the starting mixtures should be greater than the stoichiometric ratio to complete the reaction. It was observed that alumina is…
The aim of this work was to study the activation mechanism of pure aluminum in the absence and presence of indium ions in a chloride-containing medium using the electrochemical noise technique. A correlation was obtained between the noise response and the type of corrosion morphology observed by scanning electron micr…
The first C10H4 hydrocarbon, the title compound, and a few of its derivatives have been synthesized by simple reactions from bis(trimethylsilyl)-1,4-pentadiyn-3-one. Compound 1 can be isolated in the form of colorless leaflets that are extremely sensitive to polymerization. Because of its cross-conjugated π-electron s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomorphic behavior of random copolymers: thermodynamic analysis of cocrystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Naoko Kamiya, Minoru Sakurai, Yoshio Inoue, and Riichiro ChujoCite this: Macromolecules 1991, 24, 13, 3888–3892Publication Date (Print):June 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric property-electrooptical effect relationships of polymer/liquid-crystal composite filmsAkira Miyamoto, Hirotsugu Kikuchi, Satoshi Kobayashi, Yasuhiro Morimura, and Tisato KajiyamaCite this: Macromolecules 1991, 24, 13, 3915–3920Publication Date (Print):June 1, 1991…
Abstract Free radical reactions, carried out in polymer melts, have become a popular method of chemically modifying polyolefins. The elementary free‐radical reactions which are relevant in the chemical modification of polyolefins at high temperatures in extruders, such as chain transfer to polymer via primary and poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnodic underpotential deposition and cathodic stripping of iodine at polycrystalline and single-crystal gold: studies by LEED, AES, XPS, and electrochemistryBeatriz G. Bravo, Susan L. Michelhaugh, Manuel P. Soriaga, Ignacio Villegas, D. Wayne Suggs, and John L. StickneyCite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariation of polypropylene microtacticity by catalyst selectionScott Collins, William J. Gauthier, David A. Holden, Bradley A. Kuntz, Nicholas J. Taylor, and David G. WardCite this: Organometallics 1991, 10, 6, 2061–2068Publication Date (Print):June 1, 1991Publication Histor…
The average and equilibrium molecular geometries and vibrational characteristics of MnCl2, FeCl2, CoCl2, NiCl2, MnBr2, FeBr2, CoBr2, and NiBr2 have been determined by a combined analysis of gas-phase electron diffraction and vibrational spectroscopic data. The nozzle temperatures ranged between 960 and 1100 K in the e…
Research News: Protein cages acting as constrained reaction environments have recently been used to synthesize inorganic materials of nanometer dimensions. The size of the cavity within the protein and the level of loading with metal ions determine the final dimensions of the materials, and therefore site‐specific mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of new polysiloxane starburst polymersAtsushi Morikawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1991, 24, 12, 3469–3474Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 Jun…
The amino-terminal pro-sequence consisting of 77 amino acid residues is required to guide the folding of secreted subtilisin E, a serine protease, into active, mature enzyme (ikemura et al., 1987). Furthermore, denatured subtilisin E can be folded to active enzyme in an intermolecular process with the aid of an exogen…
Fatigue crack propagation in 3Y‐TZP was investigated using controlled surface flaws. A unique growth law strongly dependent on the maximum stress intensity factor and quadratically dependent on the amplitude of the range of stress intensity factor was established. This growth law was found to apply for both surface fl…
A new molecular photovoltaic system for solar light harvesting and conversion to electricity has been developed. It is based on the spectral sensitization of a thin ceramic membrane by suitable transition metal complexes. The film consists of nanometer-sized colloidal titanium dioxide particles sintered together to al…