Materials Literature
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The interaction-site-density-fluctuation correlators, the dipole-relaxation functions, and the mean-squared displacements of a system of symmetric dumbbells of fused hard spheres are calculated for two representative elongations of the molecules within the mode-coupling theory for the evolution of glassy dynamics. For…
Heteropoly acid H3PW12O40 is a very efficient and environmentally benign catalyst for the Fries rearrangement of phenyl acetate in homogeneous or heterogeneous liquid-phase systems at 100-150 degrees C.
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionThermodynamics of Pure-Silica Molecular Sieve SynthesisSanyuan Yang, Alexandra Navrotsky, and Mark E. DavisCite this: J. Phys. Chem. B 2002, 106, 20, 5312Publication Date (Web):April 26, 2002Publication History Published onl…
This paper reports on an electrochemical technique for the detection of oxidizing radical species, produced as the result of cavitation induced by ultrasound. A study of two example reactions is reported: the Weissler reaction and the Fricke reaction. In both cases, redox-active materials trap oxidative radicals. Elec…
Electric fields are used to control the layer-by-layer deposition of positively charged poly(diallyldimethylammonium chloride) (PDDA) and negatively charged CdTe nanocrystals on Au substrates following the method of ‘Electric Field Directed Layer-by-layer Assembly’ (EFDLA) described in . Experimental results demonstra…
Abstract Because silica has strong filler‐filler interactions and adsorbs polar materials, a silica‐filled rubber compound exhibits poor dispersion of the filler and poor cure characteristics in comparison with those of a carbon black‐filled rubber compound. Acrylonitrile‐butadiene rubber (NBR) improves filler dispers…
Lead sulfide, PbS, nanoparticles with the average size of 3.2 ± 0.4 nm have been synthesized by exposing self-assembled monolayers (SAMs) of 11-mercaptoundecanoic acid adsorbed Pb 2+ ions on Au(111) substrate into a H 2 S atmosphere. The preparation process of the PbS nanoparticles consists of the formation of the SAM…
The magnetic-field, temperature, and angular dependence of the interlayer magnetoresistance of two different quasi-two-dimensional (2D) organic superconductors is reported. For $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}{\mathrm{I}}_{3},$ where BEDT-TTF is bisethylenedithio-tetrat…
The aim of this study is to prepare Au clusters with a mean size ( d ) of less than 3.0 nm, at which nonmetallic properties can be expected to appear. Au clusters ( d < 3.0 nm) have been formed rapidly (<2 min) on TiO 2 surfaces by a two-step method consisting of Au(III)-complex chemisorption and subsequent photoreduc…
Abstract The performance of white rice husk ash (WRHA) as filler for polypropylene (PP)/ethylene‐propylene‐diene terpolymer (EPDM) thermoplastic elastomer (TPE) composites was investigated. The composites with different filler loadings were prepared in a Brabender plasticorder internal mixer. Both unvulcanized and dyn…
We use a recently developed tool based on geometric algebra to analyse the phase transition in quartz, the nature of the disordered high-temperature phase of cristobalite and the dynamics of silica glass. The approach is to analyse configurations generated by the reverse Monte Carlo or molecular dynamics simulations i…
Methods have been developed that further automate the building of macromolecular structures into electron-density maps. The software supports molecular-dynamics real-space refinement of an atomic model to local regions of a map within the context of a popular molecular-modeling program, O [Jones et al. (1991), Acta Cr…
We study the self-assembly in thin films of a lamella-forming polystyrene- block -poly(2-vinylpyridine)- block -poly( tert -butyl methacrylate) triblock copolymer by means of scanning force microscopy (SFM) and cross-sectional transmission electron microscopy (TEM). We follow the time development of the microdomain st…
The effect of ${\mathrm{Zn}}^{2+}$ ion impurities on the phase transition temperature of single crystals of calcium cadmium acetate hexahydrate (CCDAH) has been studied using the electron-paramagnetic-resonance technique. The lowering of the phase transition temperature as a function of increasing ${\mathrm{Zn}}^{2+}$…
A detailed thermochemical analysis of the alpha-cleavage and decarbonylation reactions of acetone and several ketodiesters was carried out with the B3LYP/6-31G* density functional method. The heats of formation of several ground-state ketones and radicals were calculated at 298 K to determine bond dissociation energie…
Ethylene propylene diene monomer rubber (EPDM) was modified with maleic anhydride (MA). Benzoyl peroxide was used as an initiator. Then the produced MA-EPDM was mixed with natural rubber (NR)/EPDM blends with various compositions. The scanning electron micrographs demonstrated that the addition of MA-EPDM (10 phr) imp…
FIP is a French Collaborating Research Group (CRG) beamline at the European Synchrotron Radiation Facility (ESRF) dedicated exclusively to crystallography of biological macromolecules, with a special emphasis on multiwavelength anomalous diffraction data collection in the 0.7-1.81 A wavelength range. The optics, consi…
The formulae for the diffraction-component precision index introduced by Cruickshank [(1999), Acta Cryst. D55, 583-601] are simplified using two approximations. A rearranged formula for the precision index is presented which can readily be calculated from experimental data. It is shown that the precision varies as (re…
A novel approach was demonstrated for the synthesis of hyperbranched polymers by direct free radical polymerization of divinyl monomers controlled by a cobalt chain transfer catalyst (1). By controlling the competition between propagation and chain transfer with 1, the free radical polymerization of ethylene glycol di…
V2O5 xerogel films modified by poly(ethylene oxide) (PEO) were obtained via the sol–gel method. Investigations were conducted by X-ray diffractometry (XRD), Fourier transformation infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry. The results show that when the V2O5 xerogel i…