Materials Literature
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We describe a two-dimensional mosaic obtained by the Voronoi tesselation of a monosize assembly of discs at different packing fractions. The experimental device (hard discs moving on an air table) produces, for every concentration of the discs, a succession of mosaics in statistical equilibrium, which constitutes a st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxo alkoxide clusters of vanadium: structural characterization of the decavanadate core in the "fully reduced" vanadium(IV) species [V10O16{(OCH2)3CCH2CH3}4]4- and [V10O14(OH)2{(OCH2)3CCH2OH}4]2- and in the mixed-valence clusters [VIV8VV2O16{(OCH2)3CR}4]2- (R = -CH2CH3,…
Measurements of the temperature and time dependence of visible diode laser transmission and reflection are combined with transmission electron microscopy (TEM) to study the crystallization of two 75 nm Ge-Te thin films. Near-stoichiometric Ge48Te52 transforms by the rapid growth of crystals through the film thickness…
A genetic approach was used to establish the route of UMP biosynthesis in Sulfolobus acidocaldarius, a member of the hyperthermophilic division (the Crenarchaeota) of the Archaea domain. Pyrimidine auxotrophs of S. acidocaldarius DG6 were isolated by direct selection and by brute-force methods. Enzymatic assay of extr…
Acoustic characterization of doped silica glasses with a GeO 2 , P 2 O 5 , F, TiO 2 , Al 2 O 3 , or B 2 O 3 dopant having different concentrations is presented. Quantitative measurements were performed with a 225‐MHz line‐focus‐beam scanning acoustic microscope. The acoustic velocity variation due to different dopant…
A mechanism is proposed for the formation of voids at triple points between grains in the anodic oxide formed on aluminum and for the growth of porous films. The proposed mechanism involves the condensation of cation and/or metal vacancies below regions in the barrier film (triple points) that are characterized by hig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the selective catalytic reduction of nitrogen oxide (NO) with ammonia over manganese oxide (Mn2O3)-tungsten oxide (WO3)/.gamma.-aluminaFreek Kapteijn, Lydia Singoredjo, Nico J. J. Dekker, and Jacob A. MoulijnCite this: Ind. Eng. Chem. Res. 1993, 32, 3, 445–452Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure viscosity of glass-forming liquids measured by the centrifugal force diamond anvil cell viscometerRichard L. Cook, Chris A. Herbst, and H. E. King Jr.Cite this: J. Phys. Chem. 1993, 97, 10, 2355–2361Publication Date (Print):March 1, 1993Publication History Publ…
Abstract The tensile property of a plastic/rubber blend depends critically on the morphology and connectivity of the two phases. At low plastic volume fractions, the plastic phase forms isolated domains in the matrix of rubber phase, and the tensile property of the blend is largely controlled by the continuous rubber…
The author studies the phase transitions of finite and infinite ferroelectric systems using the Ising model in a transverse field. The mean-field layer approximation is used and the results for the Curie temperature are expressed in terms of general determinants. The effects of surface modification are introduced thro…
Neutron-diffraction and light-scattering studies have been performed on a network glass subject to structural modifications. Large changes of the first sharp diffraction peak (FSDP) and the low frequency dynamics (the boson peak) are demonstrated by gradually changing the intermediate-range structural ordering, the sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic synthesis of primary amine-functionalized polystyrenes using 1-[4-[N,N-bis(trimethylsilyl)amino]phenyl]-1-phenylethyleneRoderic P. Quirk and Thomas LynchCite this: Macromolecules 1993, 26, 6, 1206–1212Publication Date (Print):March 1, 1993Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn imidazolate-bridged tetranuclear copper(II) complex: synthesis, magnetic and EPR studies, and crystal structure of [L4Cu4(Im)4](ClO4)4.2H2O (L = 1,4,7-triazacyclononane, Im = imidazolate anion)Phalguni Chaudhuri, Ina Karpenstein, Manuela Winter, Marek Lengen, Christian Bu…
Some improvements to the finite element computation of static magnetic fields in three dimensions using a reduced magnetic scalar potential are presented. Methods are described for obtaining an edge element representation of the rotational part of the magnetic field from a given source current distribution. When the c…
Abstract The dye‐sensitized photooxidation of l ‐histidine (His) and l ‐methionine (Met) and their simplest dipeptides with glycine (Gly) (His‐Gly, Gly‐His, Gly‐Met) and Met‐methyl ester (Met‐ME) mediated by singlet molecular oxygen (O 2 [ g ]) was studied. The overall rate constants in acetonitrile‐H 2 O ( K t ) for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(arylmethyl) quartet triradicals and quintet tetraradicalsAndrzej Rajca and Suchada UtamapanyaCite this: J. Am. Chem. Soc. 1993, 115, 6, 2396–2401Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pub…
Electronic transport properties and specific heats of ordered icosahedral phase alloys in the Al-Cu-Ru-Si and Al-Cu-Fe systems are examined, and comparison with high-quality rhombohedral (3/2) approximant phase samples of Al-Cu-Fe is made. Strong temperature dependence and sensitivity to composition changes of these p…
Abstract Experiments were performed in capillary and slit rheometers to determine the effects of the presence of fluoropolymers at the polymer-wall interface on wall slip and extrudate distortion of a molten high density polyethylene. Two fluoropolymers were used to modify the interface. It was found that one of these…
<div class="htmlview paragraph">A new technique was proposed for the simultaneous measurement of the concentration of fuel vapor and liquid in an evaporating diesel spray injected into a high temperature and high pressure environment. This technique was based on the principle of the absorption of ultraviolet las…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrowth of silica polymers in a lamellar mesophaseM. Dubois, T. Gulik-Krzywicki, and B. CabaneCite this: Langmuir 1993, 9, 3, 673–680Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1…