Materials Literature
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Diamond cold cathodes have been formed by fabricating mesa-etched diodes using carbon ion implantation into p-type diamond substrates. When these diodes are forward biased, current is emitted into vacuum. The cathode efficiency (emitted current divided by diode current) varies from 2*10/sup -4/ to 1*10/sup -10/ and in…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorannulene. A convenient new synthesisLawrence T. Scott, Mohammed M. Hashemi, Dayton T. Meyer, and Hope B. WarrenCite this: J. Am. Chem. Soc. 1991, 113, 18, 7082–7084Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 Aug…
Abstract The nature of the siloxane surface in smectites was investigated by measuring the adsorption of aromatic hydrocarbons from water by organo-clays. The organo-clays were prepared by replacing the hydrophilic, inorganic exchange cations of a series of smectites with the small, hydrophobic organic cation, trimeth…
Evidence has been found that the relaxor ferroelectric bears strong resemblance to spin and dipolar glasses. The dielectric dispersion will be shown to have a characteristic freezing temperature, near which the relaxation time distribution strongly broadens extending into the macroscopic time regime. Below this charac…
The grain bulk conductivity of acceptor‐doped SrTiO 3 ceramics was investigated by the impedance analysis method after quenching from high‐temperature equilibria. The influence of the oxygen partial pressure during equilibration, P Eq O2 , is described in terms of a defect model for titanates. From a comparison betwee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanation of silica surfaces. A new method of constructing pure or mixed monolayersP. Silberzan, L. Leger, D. Ausserre, and J. J. BenattarCite this: Langmuir 1991, 7, 8, 1647–1651Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published…
Neutron powder diffraction patterns from rutile (TiO{sub 2}, P4{sub 2}/mnm, a=4.594, c=2.959A) and anatase (TiO{sub 2}, I4{sub 1}/amd, a=3.785, c=9.514A) have been analysed by the Rietveld method. The positional parameters were determined to be x{sub O}=y{sub O}=0.30478(6) in rutile and z{sub O}=0.20806(5) in anatase.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly enantioselective epoxidation catalysts derived from 1,2-diaminocyclohexaneEric N. Jacobsen, Wei Zhang, Alexander R. Muci, James R. Ecker, and Li DengCite this: J. Am. Chem. Soc. 1991, 113, 18, 7063–7064Publication Date (Print):August 1, 1991Publication History Publish…
1. The Technology and Evaluation of Corrosion. 2. Electrochemical Thermodynamics and Electrode Potential. 3. Electrochemical Kinetics of Corrosion. 4. Passivity. 5. Polarization Methods to Measure Corrosion Rate. 6. Galvanic and Concentration Cell Corrosion. 7. Pitting and Crevice Corrosion. 8. Environmentally Induced…
A set of screening conditions for initial experiments in protein crystallization has been developed, tested, and is herein presented. These solution and precipitant conditions are empirically derived based on known or published crystallization conditions of various proteins in the past, so as to sample as large a rang…
An analysis is carried out of general aspects of the construction of three-dimensionally growing structures with an organic or an inorganic skeleton. Problems in the synthesis of novel polymeric forms based on organosilicon monomers are examined. Ways are discussed for overcoming steric effects in the surface layer, c…
Structural and magnetic properties of the rare-earth compounds ${\mathit{R}}_{2}$${\mathrm{Fe}}_{17}$${\mathrm{N}}_{\ensuremath{\xi}}$ have been studied with neutron-diffraction measurements and self-consistent spin-polarized electronic-structure calculations. The diffraction results indicate for the Nd compound that…
Measurements of the correlation function below the electrohydrodynamic instability in a thin layer of a nematic liquid crystal reveal fluctuating convection patches. Their amplitude A\ifmmode\bar\else\textasciimacron\fi{}, correlation length \ensuremath{\xi}, and correlation time \ensuremath{\tau} can be desribed by a…
A structure model for the decagonal quasicrystals AlCuCo and AlNiCo is proposed. The model agrees with available experimental data, i.e., with three-dimensional and five-dimensional Patterson analysis of x-ray-diffraction data and with direct-space atomic patterns found by high-resolution electron microscopy. The mode…
The effects of heteroatom addition on the nucleation of solid carbon in a low-pressure plasma reactor were investigated. Silane or diborane were added to acetylene mixed in hydrogen or argon. Oxygen was added to some of the diborane containing gas mixtures. Silane containing mixtures resulted in powder comprised of we…
The band gaps and exciton energies of CdS and GaP clusters are calculated for the first time using pseudopotentials. The calculated exciton energies of CdS over a wide range of cluster sizes are in excellent agreement with experiment. Furthermore, the exciton states of clusters with zinc-blende and hexagonal lattices…
The switching time (ts) for polarization reversal in ferroelectric films of PbZr0.53Ti0.47O3 and La-substituted PbTiO3 has been investigated. The films were prepared by spin-on and metalorganic decomposition followed by processing into ferroelectric capacitors having electrode areas ranging from 9 to 50 000 μm2. Pulse…
Two-dimensional molecular patterns were obtained by the adsorption of long-chain alkanes, alcohols, fatty acids, and a dialkylbenzene from organic solutions onto the basal plane of graphite. In situ scanning tunneling microscopy (STM) studies revealed that these molecules organize in lamellae with the extended alkyl c…
The structure of a 20-amino acid peptide inhibitor bound to the catalytic subunit of cyclic AMP-dependent protein kinase, and its interactions with the enzyme, are described. The x-ray crystal structure of the complex is the basis of the analysis. The peptide inhibitor, derived from a naturally occurring heat-stable p…