Materials Literature
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A study of the dissolution and repassivation of an Fe‐17.4 a/o Cr alloy in a pencil‐type artificial pit simulating one‐dimensional diffusion, has been carried out in a chloride‐containing bulk solution. The attainment of saturation of dissolution products within the artificial pit was characterized by the formation of…
The structure of electric-field-induced ferroelectric phase of NaNbO3 has been studied by means of X-ray diffraction method. Crystal cell is orthorhombic (P21 ma) with parameters: a = 5.569. b = 7.790, c = 5.518 Å, V = 239.38 Å3, Z = 4. Field-induced phase transition mainly results in reversal of atomic shift directio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymers with annealed and quenched branchings belong to different universality classesA. M. Gutin, A. Yu. Grosberg, and E. I. ShakhnovichCite this: Macromolecules 1993, 26, 6, 1293–1295Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Publi…
The nucleation of bubble domains in homeotropic samples of a dielectrically positive cholesteric liquid crystal is described. These domains are found to be more stable in an electric field than the rectilinear double-twisted fingers. The electric field-induced transformation of a looped finger into a bubble domain is…
A quasi-static model was developed to simulate the penetration process of composite lammates. The penetrator was blunt-ended. A series of static punch tests were conducted to characterize the load-displacement relation during penetration. The damage mechanisms were identified by DIB enhanced X-radiography and microsco…
Two complementary methods for measuring local pitch based on heptad position in alpha-helical coiled coils are described and applied to six crystal structures. The results reveal a diversity of pitch values: two-stranded coiled coils appear to have pitch values near 150 A; the values for three- and four-stranded coile…
Treatment of Pellethane 2363-80A--a medical-grade poly(tetramethylene oxide)-based polyurethane elastomer--with 25% (w/w) hydrogen peroxide at 100 degrees C for times ranging from 24 h to 336 h led to significant decreases in ultimate tensile properties and decreases in molecular weight, both at the surface and in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShape investigation of mixed micelles by small angle neutron scatteringH. Pilsl, H. Hoffmann, S. Hofmann, J. Kalus, A. W. Kencono, P. Lindner, and W. UlbrichtCite this: J. Phys. Chem. 1993, 97, 11, 2745–2754Publication Date (Print):March 1, 1993Publication History Published…
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…