Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInter- and intramolecular quenching of the singlet excited state of porphyrins by ferroceneRichard Giasson, Eric J. Lee, Xiaohong Zhao, and Mark S. WrightonCite this: J. Phys. Chem. 1993, 97, 11, 2596–2601Publication Date (Print):March 1, 1993Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular assemblies of porphyrins and phthalocyanines bearing oppositely charged substituents. First evidence of heterotrimer formationJ. F. Lipskier and T. H. Tran-ThiCite this: Inorg. Chem. 1993, 32, 5, 722–731Publication Date (Print):March 1, 1993Publication History…
The occurrence of a critical point in lyotropic smectic liquid crystal is experimentally evidenced by neutron and X-ray small-angle scattering experiments. In the vicinity of the critical point in the ( c-T ) phase diagram of a true binary system, we observe: 1) broadening of the Bragg peak of the coexisting lamellar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of new photochromic polymers based on phenoxynaphthacenequinoneFrida Buchholtz, Alexander Zelichenok, and Valeri KrongauzCite this: Macromolecules 1993, 26, 5, 906–910Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inis…
Abstract The pillaring of a Laponite by alumina pillars, iron pillars and mixed Al-Fe pillars was obtained by a simple in situ method starting from AlCl 3 and/or FeCl 3 solutions with different molar ratio Fe/(Fe + Al), and from NaOH solution added simultaneously to the clay suspension. The Al 13 pillars were evidence…
Abstract The calculation of the stress tensor from molecular simulations of atomistic model polymer systems employing periodic boundary conditions is discussed. Starting from the dynamical equations governing the motion of sites, correct double summation forms of the atomic and the molecular virial equations are deriv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of molecular weight and orientation on the conductivity of conjugated polymersDale S. Pearson, Phillip A. Pincus, Glenn W. Heffner, and Sam J. DahmanCite this: Macromolecules 1993, 26, 7, 1570–1575Publication Date (Print):March 1, 1993Publication History Published onl…
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…