Materials Literature
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The intercalation of hydrogen into the layered structure of MoO 3 produces four hydrogen molybdenum bronze phases H x MoO 3 (0<x<2). The correlation between the structure and the physical properties of these low-dimensional conductors has been investigated by X-ray diffraction and conductivity measurements. Powder dif…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomonuclear copper(II) complexes with multidentate amino alcohol ligands. Synthesis and characterization of a hexanuclear copper compound with a propeller structure: CuII6(bdmap)3Cl6(O)(OH) (bdmap = 1,3-bis(dimethylamino)-2-propanolato)Suning Wang, Zhen Pang, Jian Chuan Zhen…
Abstract In this communication a novel synthetic route to α‐ tert ‐butyl‐ω‐[ p ‐vinylphenyl]xy1terminated poly(2‐methylpropene) (PIB) macromonomers ( P3 (VB); P5 ) is described: magnified image and magnified image Attempts to synthesize such macromonomers in both one‐ and two‐step syntheses are described. The one‐step…
Surface roughness of planar samples causes an additional attenuation of X-ray diffraction intensity measured in Bragg–Brentano geometry. The decrease of intensity becomes stronger with decreasing scattering angle. This is part of the microabsorption effect. Two quantitative expressions describing the microabsorption e…
A Michelson interferometer of the reflection type was successfully used, for the first time, to observe the surface microtopography and the interfacial concentration gradient layers around protein crystals, which were either growing or dissolving in the solution. The significance of this technique was mentioned for th…
Tensile creep tests of single Si‐C‐O fibers (Nicalon, Nippon Carbon Co., Tokyo, Japan) were conducted in argon at 1300°C and 300 to 700 MPa. Fibers exhibited only primary creep, where the creep strain ɛ and creep time t could be empirically fitted by ɛ= (1/β) ln (1 +βɛ 0 t ). The fiber deformation was described by a r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic relaxation in semidilute and concentrated polymer solutionsWyn Brown and Petr StepanekCite this: Macromolecules 1993, 26, 25, 6884–6890Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https:/…
Stoichiometric and near‐stoichiometric silicon carbide fibers, derived from the polymer polycarbosilane, have been characterized by scanning Auger and transmission electron microscope techniques. Excess carbon usually appeared in the fibers, but it could be eliminated by controlling processing conditions. The fibers c…
Positive and negative ion FAB-MS (fast atom bombardment mass spectrometry) has been used to help characterize large polyoxoanions with molecular weights of up to 6300 mass units, specifically [BU4N]9P2W15Nb3O62 and the important polyoxoanion-supported iridium organometallic complex [Bu(4)N]Na-5(3)[(1,5-COD)Ir.P2W15Nb3…
Abstract The viscosity of thermoplastics above T g was found to greatly affect the room temperature electrical properties of conducting thermoplastic composites made by compression molding of a powder mixture, while the mechanical properties are essentially not affected. The electrical resistivity decreased and the el…
Monolayers of 2-pentadecylaniline were polymerized at the air/aqueous acid interface using ammonium persulfate as the oxidizing agent. Isotherms of 2-pentadecylaniline were measured on a 0.1 M sulfuric acid subphase at different temperatures. The mean molecular area at the surface pressure onset was found to increase…
SUMMARY Pedogenetic processes following a permafrost stage of development in four argillic brown earths with fragipans (Glossic and Ochreptic Fragiudalfs) are investigated by soil microscopy, including SEM observations of unimpregnated soil material, and by determination of clay mineralogy. Micromorphology of the appa…
Abstract Regression analysis of high-precision structural and chemical data on trioctahedral and dioctahedral micas yielded interrelationships between unit-cell parameters, chemical composition and structural details. Regression equations relating b and c sin β parameters of micas to composition were used for estimati…
Ultrasonic attenuation and phase velocity in a solid insulating material are determined in a broad frequency band by studying the propagation of a pressure pulse in a sample of this material submitted to an electric field of known value. During the propagation of the pulse in the sample, which is placed between short-…
The thermal transformation of pyrophyllite was analyzed using 27‐Al and 29‐Si MAS‐NMR spectroscopies, thermal analysis (DTA‐TG), dilatometry, and X‐ray diffraction techniques. Above 800°C, dehydroxylation of pyrophyllite is the origin of a broad component in the 27‐Al NMR spectra which is associated with a distorted p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption and reactions of tetraethoxysilane (TEOS) on clean and water-dosed titanium dioxide (110)L. Gamble, M. B. Hugenschmidt, C. T. Campbell, Teresa A. Jurgens, and J. W. Rogers Jr.Cite this: J. Am. Chem. Soc. 1993, 115, 25, 12096–12105Publication Date (Print):December…
An electrochemical method has been employed to obtain the population distribution of minimum grain boundary Cr concentrations for sensitized AISI 304 stainless steel (S30400). The detailed information about the extent of Cr depletion provided by the distribution is compared to the average degree of sensitization (DOS)…
The structure of the incommensurate composite crystal of the trigonal sulfide Sr 1.145 TiS 3 , M r =244.42, has been analyzed on the basis of the four-dimensional superspace group P R3m 1s using powder X-ray diffraction data and the Rietveld analysis process. The unit cell and other crystal data are a 1 =a 2 =11.5108…
BaTiO 3 thin films possessing ferroelectric characteristics have been successfully synthesized using the laser ablation technique. The films are polycrystalline when deposited with substrate temperature higher than 550°C at 1 mbar oxygen pressure. All of the films are highly textured and dominated by (111) grains. The…
Abstract A study was made of the ceric ammonium nitrate (CAN) initiated graft copolymerization of methyl acrylate (MA) onto potato starch. The variables affecting the graft were investigated. The optimums have been obtained; they are the concentrations of MA, CAN, and nitric acid (HNO 3 ) (1.08, 5.0 × 10 −3 , and 0.08…