Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT"Melting Transition" of a Quantum Dot Solid: Collective Interactions Influence the Thermally-Induced Order−Disorder Transition of a Silver Nanocrystal SuperlatticeBrian A. Korgel, Nelsi Zaccheroni, and Donald FitzmauriceView Author Information Department of Chemical En…
This article summarizes several technical studies reported in the literature on catalytic conversion technology to control pollution due to automotive exhausts with specific focus on NOx reduction. While simple theoretical reactions are stated, the review concisely presents the various techniques available with their…
Polyaddition of isophorone diisocyanate to poly(oxypropylene)glycol (PPG)-Based waterborne polyurethane (WPU) synthesized by a modified acetone process was performed. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), and impedance spectrosc…
The synthesis and characterization of a series of n -[(4-cyano-4‘-biphenylyl)oxy]alkyl-2,5-dichlorobenzoate monomers containing from n = 2 to 12 methylenic groups in the alkyl spacer and their Ni(0)-catalyzed polymerization to produce poly( p -phenylene)s (PPP) containing mesogenic side groups are described. The resul…
At the Fifth Chemical Congress of North America held at Cancun in November, 1997, a broad definition of the fields to be covered in the symposium on natural polymers as advanced materials was given. Included were recent developments and future prospects for natural polymers in uses ranging from detergents, adhesives,…
The molecular designed dispersion method is used to prepare supported transition metal oxide catalysts (Mo, Cu, V). The corresponding transition metal acetylacetonate complexes were reacted with silica or alumina, and subsequently thermally converted into the supported metal oxide. The deposition of these acetylaceton…
The kinetics, molecular weight averages and the average degree of branching, DB, are calculated analytically for the self-condensing vinyl copolymerization (SCVCP) of a vinyl monomer M with an “inimer” AB*, i.e., a molecule having a vinyl group A and an initiating group B*. MWD and DB strongly depend on the monomer/in…
The classical theory of colloidal stability, the well-known Derjaguin−Landau−Verwey−Overbeek (DLVO) theory, predicts a loss of stabilization with increasing salt concentration. An anomalous stability of the system is found at high salt concentrations when proteins cover colloidal particles. It has been demonstrated th…
The dynamic behaviour and stability of a two-dimensional immiscible droplet subject to shear or pressure-driven flow between parallel plates is studied under conditions of negligible inertial and gravitational forces. The droplet is attached to the lower plate and forms two contact lines that are either fixed or mobil…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of Tethered Polystyrene-block-Poly(methyl methacrylate) Monolayer on a Silicate Substrate by Sequential Carbocationic Polymerization and Atom Transfer Radical PolymerizationBin Zhao and William J. BrittainView Author Information Department of Polymer Science…
We analyze the interplay between disorder and band structure in current perpendicular to the planes (CPP) giant magnetoresistance (GMR). We consider finite magnetic multilayers attached to pure crystalline leads, described by a tight-binding simple cubic two-band model (s-d). Several models of disorder are considered,…
The investigations of the Raman scattering spectra of the KDy(WO<SUB>4</SUB>)<SUB>2</SUB> single crystals have shown that the phase transitions found at 6.38 K exhibit the peculiarities characteristic of SPT Jahn-Teller type. The paper presents also the results of IR absorption investigations of the ADy(WO<SUB>4</SUB>…
Simultaneous determination of the lamellar morphological length scale and the grain size of several low molecular weight heterogeneous styrene−butadiene block copolymers was accomplished through the use of ultra-small-angle X-ray scattering measurements. NIST's X23A3 Ultra SAXS beamline of the National Synchotron Ligh…
In the present work the meso- and macrostructural characteristics of the recently developed model mesoporous adsorbent MCM-41, of different pore diameters, prepared in our laboratory, have been estimated with the help of various techniques. The structure is found to comprise four different length scales those of the m…
Cation exchange in styrene sulfonate gels of thickness less than 100 nm is described. The measurement, involving a radiochemical displacement proximity assay with 45 Ca 2+ as a convenient reference ion, permits rapid evaluation of the kinetics and equilibrium distribution of ions. Because the films are so thin, the li…
We show in this study that suspending alumina in a tungstate solution leads to the formation of Keggin-type aluminotungstic species in solution. This process occurs even at “nonaggressive” (near-neutral) pH. This can be rationalized as a ligand-promoted oxide dissolution effect which is well-known in geochemistry: the…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHydrotalcite-Catalyzed Epoxidation of Olefins Using Hydrogen Peroxide and Amide CompoundsKazuya Yamaguchi, Kohki Ebitani, and Kiyotomi KanedaView Author Information Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University, 1−3 Mac…
Molecules in which the cores of copper and nickel octaazaphthalocyanines are fused to four nonracemic [7]helicenes are constructed. CD and UV−vis absorption spectroscopy show that these compounds aggregate when dissolved in 75% EtOH−25% CHCl 3, but not in 60% EtOH−40% CHCl 3 . The UV−vis absorption spectra of films of…
Textiles and moisture Fibre dimensions Yarn tests Strength and elongation tests Dimensional stability Serviceability Comfort Colour fastness testing Objective evaluation of fabric handle Quality.
Organically bound sulfur is a common impurity in carbon blacks, such as vulcanized carbon and coal. Whereas this organosulfur is usually removed by heating to high temperatures, we describe a low-temperature method to desulfurize solid carbon via oxidation (ultimately to SO 4 2- ) on a Pt catalyst in oxygenated aqueou…