Materials Literature
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Molecular-dynamics simulations are performed to determine dynamic correlations in ${\mathrm{SiO}}_{2}$ glass. The frequency and eigenvectors of vibrational normal modes are obtained by diagonalizing the dynamical matrix. Dynamic structure factors, partial and total vibrational density of states (DOS), and participatio…
In this paper we present an equilibrium molecular dynamics study of oligomer (5-mer) films at liquid densities confined between planar simple-cubic surfaces. The systems studied were wide enough to develop a bulklike region in the middle half of the film and two well-separated interfaces. Our work focused on the effec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of trialkoxysilane functionalization in the preparation of organic-inorganic compositesBradley K. Coltrain, Christine J. T. Landry, James M. O'Reilly, Alexandra M. Chamberlain, Gary A. Rakes, Joseph S. Sedita, Larry W. Kelts, Michael R. Landry, and Victoria K. LongCite…
This contribution describes the rational step-by-step construction of molecular solids useful for the field of molecular electronics. Chain stiffness as a structural principle leads to the design of the macromolecules which already in a molecularly disperse state show effects expected for 1-dimensional solids. Phthalo…
The recent observation of room temperature photoluminescence (PL) from porous Si layers (PSLs) has received considerable attention. Bulk crystalline Si does not luminesce efficiently at room temperature due to the indirect nature of the energy bandgap minimum. The PL from PSLs has been attributed to quantum confinemen…
Silver nitrate and succinic acid react to form the pale yellow prisms of succinatodisilver( I ) ( 1 ). The structure of 1 (shown on the right) contains Ag 4 clusters parallel to the ac plane, each of which are bound to four other clusters through succinato bridges. equation image
Highly nitrogenated amorphous carbon films have been prepared by reactive rf-magnetron sputtering using pure N 2 or Ar/N 2 mixed gases. The nitrogen content measured by Rutherford backscattering spectrometry was 40 at% for pure N 2 gas and 35 at% for Ar75%-N 2 25% mixed gas. Oxygen atoms of about 7 at% were also detec…
Abstract Bis(oxazolyl)benzenes and bis(thiazolyl)benzenes containing fluorine atoms and trifluoromethyl groups in the heteroaromatic moieties have been synthesized. These compounds can be used as monomers for the preparation of poly(arylether oxazole)s and poly(arylether thiazole)s with pendent trifluoromethyl groups.…
Abstract In bulk foams, the dependence of bubble size on time can be deduced from a hypothesis of statistical self‐similarity and the scaling characteristic of the volume change rate of a foam bubble. If this rate, \documentclass{article}\pagestyle{empty}\begin{document}$ {\dot v} $\end{document} , scales as the mean…
Abstract Seah and Smith have reported a method of measuring the peak‐to‐background ratio below the silver LMM Auger peak as a function of the pass energy of a hemispherical electron spectrometer. They used this measurement to reveal the extent of a contribution to the observed spectrum due to secondary electrons gener…
Abstract 3-Acetamido-6-heptafluoropropylphenylboronic acid was synthesized by the perfluoroalkylation of 3-acetamidophenylboronic acid (pKa = 8.3) with bis(heptafluorobutyryl)peroxide. The perfluoroalkylated phenylboronic acid thus prepared was determined to have a low pKa as 6.6 by potentiometric titration. Lowered p…
Bi-containing crystals of YbAl 3 (BO 3 ) 4 and ErAl 3 (BO 3 ) 4 with the huntite structure doped with Si 4+ , Ge 4+ and transition metal cations Ti 4+ , V 5+ , Cr 3+ and Mn 4+ have been grown by spontaneous crystallization from fluxes based on Bi 2 O 3 -B 2 O 3 -Li 2 O. The Li + cation was used for charge compensation…
Abstract This paper analyses the terminal ballistic performance of segmented rod penetrators in semi‐infinite, spaced as well as reactive targets. The model scaled projectiles with a mass of about 10 g are launched by a light gas gun of caliber 30 mm at velocities up to 4 km/s. To keep the initial acceleration low eno…
Abstract Exploration of the reactions of the 9‐azahomocubane system led to derivatives of two small‐ring systems containing aza‐bridging atoms, 5‐azatetracyclo[4.2.0.0 3,8 .0 4,7 ]octane and 9‐azatetracyclo[4.3.0.0 2,5 .0 4,7 ]nonane. The structures were characterized by X‐ray diffraction analyses. There are no prior…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-liquid equilibria of six binary mixtures containing indoleChiaki Yokoyama, Takeo Ebina, and Shinji TakahashiCite this: J. Chem. Eng. Data 1993, 38, 4, 583–586Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 Octob…
Abstract During the last 10 years shaped charges with spherical liners have arosed great interest in research and development because their application in special munition results in an increase of performance. The present report presents measured characteristics of shaped charges with hemispherical liners. A short ex…
The thermodynamic and phase equilibrium data of the binary Mg-Cu system were assessed thermodynamically to yield two descriptions. In the first description, the liquid and the (Cu) phase were treated as substitutional solutions and the two intermetallic phases, Mg[sub 2]Cu and MgCu[sub 2], as stoichiometric phases. In…
Epitaxial films of layered GaSe with (0001) surfaces have been grown on GaAs(001) substrates in spite of the large difference in their crystal symmetry. In situ observation of reflection high-energy electron diffraction has revealed that a number of facets grow on the surface of GaAs(001) under Se irradiation. The exi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic origin of nonstoichiometry in early-transition-metal chalcogenidesJeremy K. Burdett and John F. MitchellCite this: Chem. Mater. 1993, 5, 10, 1465–1473Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October…
The thermodynamic cycle appropriate to an alkali metal thermal‐to‐electric converter (AMTEC) cell is discussed for both liquid‐ and vapor‐fed modes of operation, under the assumption that all processes can be performed reversibly. In the liquid‐fed mode, the reversible efficiency is greater than 89.6% of Carnot effici…