Metal complexes in inorganic matrixes. 7. Nanometer-sized, uniform metal particles in a silica matrix by sol-gel processing of metal complexes
S.559-566 : Abb.,Tab.
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The electrical properties and device applications of homoepitaxial and polycrystalline diamond films
Electronic applications of semiconductor diamonds are addressed. Doping and electrical properties of these films, formation of low-resistive 'ohmic' contacts, surface modification methods, and experimental device applications are discussed. Of particular interest are high-temperature (300 degrees C) MOSFETs and metal…
Methanol Synthesis from CO2 and H2 over CuO–ZnO Catalysts Combined with Metal Oxides under 13 atm Pressure
Abstract The synthesis of methanol from CO2 and H2 in a flow reactor was studied over CuO–ZnO catalysts combined with ZrO2, MgO, Al2O3, or Cr2O3 under a presssure of 13 atm. CuO–ZnO–Al2O3, CuO–ZnO–ZrO2, and CuO–ZnO–MgO showed higher activity and higher selectivity for methanol than did CuO–ZnO. The selectivity for met…
Relationship between microstructure and mechanical properties in metastable β titanium 15–3 alloy
The effect of grain size on the mechanical properties of metastable Ti–15V–3Cr–3Sn–3Al β titanium alloy has been investigated. In the solution annealed condition the small grain sized specimens are of strength higher than the large grain sized specimens. However, when the alloy is aged the large grain sized specimens…
Synthesis and electrical response of single-ion conducting network polymers based on sodium poly(tetraalkoxyaluminates)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and electrical response of single-ion conducting network polymers based on sodium poly(tetraalkoxyaluminates)Kate E. Doan, M. A. Ratner, and D. F. ShriverCite this: Chem. Mater. 1991, 3, 3, 418–423Publication Date (Print):May 1, 1991Publication History Published on…
Strength Development in Phosphate‐Bonded Calcium Aluminate Cements
The chemical reaction at room temperature between calcium aluminate cement (CAC) and NH 4 H 2 PO 4 ‐based fertilizer solution causes the formation of ammonium calcium pyrophosphate (AmCPP) as an amorphous cementitious phase. This phase was responsible for the development of strength in rapid‐setting phosphate‐bonded c…
New Metallic Coagents for Curing Elastomers
Abstract Based on the data reported in this paper, it is evident that the zinc salts of acrylic acid and methacrylic acid are effective coagents for the peroxide curing of EPDM and NBR. They appear to be unique among coagents in their ability to maintain high elongation while increasing the hardness and tensile proper…
Uses of ultraviolet/ozone for hydrocarbon removal: Applications to surfaces of complex composition or geometry
The use of ultraviolet (UV)/ozone treatment for the removal of hydrocarbon contamination is discussed for a number of substrates involving complex composition or geometries. Treatment of gold and silicon dioxide surfaces in a reactor attached on line to an x-ray photoelectron spectrometer showed that the chemistry of…
〈1123〉{1011} slip in zirconium
Electron microscopy observations were made on Zr polycrystals deformed at room temperature. Deformation substructure consists of ⅓〈1120〉 dislocations mostly in screw orientations, ⅓〈1123〉 dislocations on {1011} planes, and deformation twins with a small volume fraction. The observed configurations of the ⅓〈1123〉 dislo…
Dielectric and conductivity relaxation in poly(propylene glycol)–lithium triflate complexes
The electric modulus representation is used to display conductivity and dielectric relaxation occurring in poly(propylene glycol)-4000 (PPG) complexed with LiCF3SO3, as the ether oxygen to lithium (O:Li) ratio is varied from 300:1 to 12:1. The frequency range covered is 10 to 107 Hz. Results are obtained for temperatu…
Preparation and characterization of cellulose monoacetates: the relationship between structure and water solubility
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of cellulose monoacetates: the relationship between structure and water solubilityCharles M. Buchanan, Kevin J. Edgar, and Alan K. WilsonCite this: Macromolecules 1991, 24, 11, 3060–3064Publication Date (Print):May 1, 1991Publication History…
Mesomorphic Behavior of 1,2-Phenylene Bis[4-(4-alkoxybenzylideneamino)benzoates
A series of 1,2-phenylene bis[4-(4-alkoxybenzylideneamino)benzoates has been prepared in order to establish that the nonlinear molecular structure is not necessarily incompatible with mesophase formation. The phases appearing in the methoxy and ethoxy derivatives are classical nematic. While the propoxy to octyloxy de…
Preparation of cellulose [1-carbon-13]acetates and determination of monomer composition by NMR spectroscopy
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of cellulose [1-carbon-13]acetates and determination of monomer composition by NMR spectroscopyCharles M. Buchanan, Kevin J. Edgar, John A. Hyatt, and Alan K. WilsonCite this: Macromolecules 1991, 24, 11, 3050–3059Publication Date (Print):May 1, 1991Publication H…
On the interaction of a collapsing cavity and a compliant wall
The collapse of a spherical vapour cavity in the vicinity of a compliant boundary is examined numerically. The fluid is treated as a potential flow and a boundary-element method is used to solve Laplace's equation for the velocity potential. Full nonlinear boundary conditions are applied on the surface of the cavity.…
Lattice instabilities near the critical V-V separation for localized versus itinerant electrons inLiV1−yMyO2(M=Cr or Ti)Li1−xVO2
From the compositional dependences of the lattice parameters in the system ${\mathrm{LiV}}_{1\mathrm{\ensuremath{-}}\mathrm{y}}$Cr $_{\mathrm{y}}\mathrm{O}_{2}$, a critical V-V separation ${\mathrm{R}}_{\mathrm{c}}$=2.90\ifmmode\pm\else\textpm\fi{}0.01 \AA{} has been determined for an array of octahedral-site ${\mathr…
Microstructure evolution in h.c.p. metals during irradiation
Radiation damage in h.c.p. metals is significantly different from that in f.c.c. or b.c.c. metals. In the latter metals, loops that are primarily interstitial in nature simply form on the close-packed planes, {111} for f.c.c. and {110} for b.c.c. The loops may then shear into configurations of lower energy, that is un…
Syntheses of quadruply two- and three-atom, aza-bridged, cofacial bis(5,10,15,20-tetraphenylporphyrins)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses of quadruply two- and three-atom, aza-bridged, cofacial bis(5,10,15,20-tetraphenylporphyrins)Brett C. Bookser and Thomas C. BruiceCite this: J. Am. Chem. Soc. 1991, 113, 11, 4208–4218Publication Date (Print):May 1, 1991Publication History Published online1 May 2002…
Computer simulation of twinning dislocation in magnesium using a many-body potential
Twinning is an important plastic deformation mechanism in the response of h.c.p. metals to applied stress, and in the present paper the atomic processes associated with {1011}, {1012}, {1121} and {1122} twinning in Mg are considered. The technique of atomic-scale computer modelling has been used, with atomic interacti…
Interfacial studies of incompressible binary blends
Density functional theory is used to investigate two of the possible reasons for the discrepancy between theory and experiment for the interfacial width and tension of phase separated binary blends. The two reasons are the inadequacy of the density functionals used previously and the neglect of the composition depende…
A conceptual approach for noncontact calorimetry in space
A concept is developed and described which allows to measure the heat capacity and the effective thermal conductivity of stable and undercooled liquid metals and alloys in an electromagnetic levitation apparatus. We propose to use an ac pulse heating method which is used nowadays as a standard technique for precision…