Materials Literature
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The effect of heat treatment temperature on bending properties and transformation temperatures of a Ni-Ti alloy wire, 1.0 mm in diameter, was investigated so that superelasticity could be used in orthodontic appliances needing shape memory processes. The heat treatment process was at 713 K for 1.8 ks and between 673 K…
Abstract Calcium-cadmium and calcium-zinc exchange equilibria were studied at 20°C and constant ionic strength (0·015) on four clay minerals, viz. montmorillonite, bentonite, illite and vermiculite. Vermiculite and, to a lesser extent, illite and bentonite showed the strongest affinity for Cd 2+ or Zn 2+ over Ca 2+ io…
<div class="htmlview paragraph">Primary measures, to reduce the NO<sub>x</sub> emissions from diesel engines, penalize the fuel consumption and aggravate the CO<sub>2</sub> problem. Instead, an after-treatment system is proposed that permits optimum combustion and yet reduces the NO<su…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure and spectroscopy of nickel(II), palladium(II), and platinum(II) acetylacetonate complexesFrederick D. Lewis, Gwen D. Salvi, David R. Kanis, and Mark A. RatnerCite this: Inorg. Chem. 1993, 32, 7, 1251–1258Publication Date (Print):March 1, 1993Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of [Cp*Rh(.mu.-Cl)]2 and its dioxygen and nitrosobenzene insertion productsDavid W. Hoard and Paul R. SharpCite this: Inorg. Chem. 1993, 32, 5, 612–620Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993…
Article Alkylpolyglycoside - eine neue Tensidgeneration für die Kosmetik / Alkyl Polyglycosides — a New Generation of Surfactants for Cosmetics was published on March 1, 1993 in the journal Tenside Surfactants Detergents (volume 30, issue 2).
A new high temperature form of Y 2 O 3 has been synthesized at 2220 °C by a laser beam heating technique. The new form has a face-centered cubic structure with a = 5.2644(3)Å, Z = 2, D x = 5.14 g/cm 3 , and is considered to have a fluorite-type structure containing disordered oxygen vacancies.
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…