Materials Literature
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Electrical and photoelectrical properties of nondoped and doped zinc oxide films coated on glass plates by the dip-coating method are investigated at room temperature in various ambient atmospheres. The dark conductivity of the nondoped films exponentially decreased with decreasing film thickness while the conductivit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass Transition Temperatures of Polymers from Molecular Dynamics SimulationsJie Han, Richard H. Gee, and Richard H. BoydCite this: Macromolecules 1994, 27, 26, 7781–7784Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue…
Transition metal ions doped into TiO_2 can increase the quantum efficiency of the heterogeneous photooxidation of chlorinated hydrocarbons. In this regard, a single dopant (vanadium) has been selected for a detailed investigation to elucidate the mechanism of the dopant action on the photoreactivity of TiO_2. Large po…
A method is developed that yields the residual stress, the orientation distribution coefficients, the average crystallite dimension, the microstrain, and the crystal structure parameters from x-ray diffraction data in a single-step procedure. To this end, a general approach is introduced that combines the equations of…
Ruthenium polypyridyl compounds, cis-[4,4'-(CO2H)(2)-2,2'-bipyridine]Ru-2(X)(2) and cis-[5,5'-(CO2H)(2)-2,2'-\nbipyridine]Ru-2(X)(2) where X = Cl-, CN-, and SCN-, have been prepared, spectroscopically characterized, and anchored to high\nsurface area TiO2 electrodes for the conversion of visible light into electricity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiomimetic Chemistry of NickelMalcolm A. Halcrow and George ChristouCite this: Chem. Rev. 1994, 94, 8, 2421–2481Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/cr00032a00…
Transient measurements of thermal conductivity, thermal diffusivity, and specific heat capacity have been performed with hot disk sensors in thin samples of metallic materials. With this new variation of the hot disk method the sample size can be reduced to a volume less than ten cubic centimeters for copper at room t…
We present ab initio calculations of the structural, cohesive, and electronic properties of various polymorphic forms of carbon and boron nitride. Our calculations are based on ultrasoft pseudopotentials and a variational approach to the solution of the Kohn-Sham equations. Optimization of the atomic geometries is per…
The domain dynamics of a quenched system with many nonconserved order parameters was investigated by using the time-dependent Ginzburg-Landau kinetic equations. Our computer simulation of a model two-dimensional system produced microstructures remarkably similar to experimental observations of normal grain growth. Aft…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Modeling of Spider Silk ElasticityYves TermoniaCite this: Macromolecules 1994, 27, 25, 7378–7381Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/ma00103a018https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Surfactant/Silica Molar Ratios on the Formation of Mesoporous Molecular Sieves: Inorganic Mimicry of Surfactant Liquid-Crystal Phases and Mechanistic ImplicationsJ. C. Vartuli, K. D. Schmitt, C. T. Kresge, W. J. Roth, M. E. Leonowicz, S. B. McCullen, S. D. Hellring…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-State Structures of Hydrogen-Bonded Tapes Based on Cyclic Secondary DiamidesJohn C. MacDonald and George M. WhitesidesCite this: Chem. Rev. 1994, 94, 8, 2383–2420Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTClay-Reinforced Epoxy NanocompositesTie Lan and Thomas J. PinnavaiaCite this: Chem. Mater. 1994, 6, 12, 2216–2219Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/cm00048a0…
Analysis of a crystal structure using the Rietveld profile technique requires a suitable description of the shape of the peaks. In general, modern refinement codes include accurate formulations for most effects; however, the functions used for peak asymmetry are semi-empirical and take very little account of diffracti…
Comprehensive datasheets on more than 60 titanium alloys More than 200 pages on metallurgy and fabrication procedures Input from more than 50 contributors from several countries Careful editorial review for accuracy and usefulness. Materials Properties Handbook: Titanium Alloys provides a data base for information on…
A systematic study of metal ion doping in quantum (Q)-sized (2-4 nm) TiO_2 colloids is performed by measuring their photoreactivities and the transient charge carrier recombination dynamics. The presence of metal ion dopants in the TiO_2 crystalline matrix significantly influences photoreactivity, charge carrier recom…
Abstract (Acetyl) (ethyl) cellulose (AEC) polymers with an ethyl degree of substitution (DS) of 2.5 and acetyl DS ranging from 0 to 0.5 dissolve readily in a wide range of organic solvents and form chiral nematic liquid crystalline phases in concentrated solution. The chiroptical properties of these liquid crystals ar…
Abstract A general method for the preparation of aromatic poly (ether‐sulfone‐amide)s has been developed. Polymerization is based on the palladium‐catalyzed polycondensation of aromatic dibromides containing ether sulfone structural units, aromatic diamines, and carbon monoxide. Reactions were carried out in N , N ‐di…
Abstract Highly active catalysts for copolymerization have been prepared by the precipitation of MgCl 2 /ToCl 4 complex with or without high surface area silica. Copolymerization of ethylene and 1‐butene has been tested by using the prepared catalysts at various concentrations of 1‐butene. The catalytic activities are…
Abstract Change in the glass transition temperature, T g , of poly(2,6‐dimethyl phenylene oxide), PPO, due to the dissolved CO 2 has been measured as a function of the gas pressure, p , using a high‐pressure DSC cell. At 61.2 atm, the highest pressure studied, T g is depressed by 31.6°C. The depression in T g is found…