Materials Literature
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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…
Free base 5,10,15,20-tetrakis(4- n -octylphenyl) porphyrin (H 2 TOPP) belongs to a class of self-organizing porphyrins. Since its LUMO lies above the conduction band of titanium dioxide (TiO 2 ) and its visible light absorption is very strong, sensitization of TiO 2 with H 2 TOPP thin films is possible. After spin-coa…
Triphenyl phosphite was studied by powder X-ray diffractometry, adiabatic calorimetry, and dielectric relaxation measurements. The highly correlated liquid, denoted by L C, phase corresponding with the glacial phase by Cohen et al. was prepared by annealing the ordinary liquid, denoted by L N, at 210 K, and different…
Several mixed cation effects in the electrical conductivity and mechanical loss spectra of mixed alkali and mixed alkali−alkaline earth glasses are identified, and their interrelation is analyzed. Apart from the classical mixed cation effects in the ionic diffusivities, we find characteristic effects in the frequency…
The title compound, K 2 Mn 3 (H 2 O) 6 [Mo(CN) 7 ] 2 ·6H 2 O, has been synthesized by slow diffusion of aqueous solutions saturated in KNO 3 and containing K 4 [Mo(CN) 7 ]·2H 2 O and [Mn(H 2 O) 6 ](NO 3 ) 2, respectively. The compound crystallizes in the monoclinic system, space group C 2. The Mo site is surrounded by…
To improve the understanding of the applicability of CO−FTIR spectroscopy for probing the electronic properties of catalysts, the effect of CO adsorption on the geometry of small metal particles in Pt/LTL and Pt/SiO 2 catalysts with varying support acidities was determined by comparison of X-ray absorption spectra bef…
Atomic force microscopy (AFM) imaging and force−distance curves have been used to investigate, in situ, the nanoscale organization of collagen adsorbed on polymer substrata covering a wide range of surface roughness and surface hydrophobicity: bisphenol A polycarbonate (PC), poly(ethylene terephthalate) (PET), and pol…