Materials Literature
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Recent computational studies of models for manganese oxides have revealed a rich phase diagram, which was not anticipated in early calculations in this context performed in the 1950s and 1960s. In particular, the transition between the antiferromagnetic insulator state of the hole-undoped limit and the ferromagnetic m…
Several smectites were pillared with metal complexes, such as the trimeric cobalt cation [Co 3 (OC 2 H 4 NH 2 ) 6 ] 3+ and its divalent analogue [Co 3 (OC 2 H 4 NH 2 ) 6 ] 2+, containing clusters of one to three cobalt cations separated by bridging ligands. In pillared interlayered clays (PILC) prepared by reacting Na…
The preparation and properties are described of complexes resulting from the mono- and diprotonation of the [Co(4)O(4)](4+) unit to give products containing [Co(4)O(3)(OH)](5+) and [Co(4)O(2)(OH)(2)](6+), respectively. Treatment of [Co(4)O(4)(O(2)CC(6)H(4)-p-OMe)(2)(bpy)(4)](2+) (bpy = 2,2'-bipyridine) in MeCN with 70…
In this paper, we report a simple and clean method of producing uniform nonaqueous gold colloids by the chemical reduction of chloroauric acid (HAuCl 4 ) using the oxygen-free organic supporting medium formamide itself as reducing agent in the presence of the stabilizer poly(vinylpyrrolidone) (PVP). The reduction of H…
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,…
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…