Materials Literature
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A novel and simple chemical reduction route at room temperature is described to synthesize nanocrystalline CdS, ZnS, and Cd x Zn 1 - x S. In the method, anhydrous CdCl 2, or ZnCl 2, S, and KBH 4 powders react at room temperature in various organic solvents, and the effect of the solvent on the quality of the nanoparti…
Novel palladium hollow spheres were synthesized using silica spheres as a template, and they were successfully applied as recyclable heterogeneous catalysts for Suzuki cross coupling reactions.
Calorimetric, X-ray scattering, and optical microscopy measurements have been used to characterize the morphology of two PEO- b -PS- b -PEO copolymers. When the molecular weight of the PS block is much larger than the PEO one, the copolymer does not crystallize from the melt, and two well-separated glass transitions a…
The atomistic structures of SrO $(15\ifmmode\times\else\texttimes\fi{}15\ifmmode\times\else\texttimes\fi{}2.2\mathrm{nm}),$ CaO $(14\ifmmode\times\else\texttimes\fi{}14\ifmmode\times\else\texttimes\fi{}2\mathrm{nm}),$ and $\mathrm{MgO}$ $(12\ifmmode\times\else\texttimes\fi{}12\ifmmode\times\else\texttimes\fi{}2\mathrm…
Abstract Following the previous studies of epoxy/silver conductive composites, a detailed investigation of the influence of ethylene glycol on the resulting resistivity of various composites was carried out. Ethylene glycol was found to have a catalytic effect on the curing process of the epoxy resin, verified by diff…
Hydrated zirconium molybdate (ZMh) is known to precipitate from solutions of dissolved spent nuclear fuel, particularly from the waste fission product solution after the uranium and plutonium have been extracted during reprocessing. Its precipitation can cause major problems during waste treatment, and therefore a com…
Abstract To make crosslinked polypropylene (PP) and PP with high melting strengths, we studied the effects of radiation on the crosslinking and branching of PP in detail with the Charlesby–Pinner (C–P) equation. We studied the radiation crosslinking and branching behavior of homopolypropylene (HPP), impact copolypropy…
Trivalent iron substituted hexagonal mesoporous aluminophosphate molecular sieve has been synthesized and characterized for the first time, which showed excellent catalytic activity and reusability for the cyclohexane oxidation reaction under mild conditions.
A new series of transition-metal oxyhalides (MCl)LaNb(2)O(7) (M = Cr, Mn, Fe, Co) have been prepared by a simple topochemical route. Layered perovskite hosts (ALaNb(2)O(7), A = Li, Na, K or Rb) were reacted with the corresponding anhydrous metal halides under mild reaction conditions (<400 degrees C). The compounds we…
Abstract Nineteen kinds of minerals, alone and in bicomponent mixtures with LaC (a mixed ternary complex of trivalent lanthanum stearate and stearin), were added to isotactic polypropylene (iPP). The influences of the minerals on the crystallographic forms of iPP were investigated. A wide‐angle X‐ray diffraction exami…
The high frequency collective dynamics of liquid hydrogen fluoride is studied by inelastic x-ray scattering on the coexistence curve at T = 239 K. The comparison with existing molecular dynamics simulations shows the existence of two active relaxation processes with characteristic time scales in the subpicosecond rang…
Abstract By mixing natural rubber latex uniformly with methyl methacrylate‐grafted natural rubber latex and then carrying out prevulcanization, we obtained blends with stable viscosities. Under certain blending ratios, the blends maintained good basic properties, and the heat stability time ( T HS ) of the blend incre…
meso -Tetraphenyl-21-chalcogenaporphyrins 4 − 6 (S, Se, and Te as 21-chalcogen atoms, respectively) and meso -tetraphenyl-21,23-dichalcogenaporphyrins 7 − 10 [(S,S), (Se,S), (Se,Se), and (Te,S) combinations as 21,23-chalcogen atoms, respectively] were prepared by condensation of the appropriate 2,5-bis(phenylhydroxyme…
The importance of vicinal and long-range interresidue effects in determining the stability of the collagen triple helix has been investigated by quantum mechanical (QM) and molecular mechanical (MM) computations on suitable model polypeptides, taking into account solvent effects by the polarizable continuum model (PCM…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSurface and Precipitation Polymerization of AnilineSvetlana Fedorova and Jaroslav StejskalView Author Information Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg 199004, Russia Institute of Macromolecular Chemistry, Academy of Sciences of the…
A series of experiments has been designed and conducted to test a recent model for the morphological behavior of polymer−layered silicate (PLS) nanocomposites, where a PLS nanocomposite is composed of a homopolymer matrix, a layered silicate clay mineral filler, and an organic surfactant modifier. For nearly complete…
To explore the ability of the “effective concentration” model to quantitatively predict the individual local dynamics of each component in miscible polymer blends, three model systems [polystyrene/poly(vinyl methyl ether), polystyrene/poly( o -chlorostyrene), and poly(vinyl methyl ether)/poly( o -chlorostyrene)] are s…
Abstract The hot‐wire parallel technique standardized for determining the thermal conductivity of ceramic materials was employed in the determination of the thermal properties of polymers. For these materials, additional care must be taken considering the low melting point of polymers, when compared with that for cera…
Various 109Ag NMR techniques are used to study silver diffusion in silver iodide/silver phosphate glasses. In particular, for the first time, four-dimensional (4D) NMR is applied on solid ion conductors. All experiments consistently show that silver dynamics are governed by a very broad, continuous distribution of cor…
Abstract A suspension of non‐neutrally buoyant, large, nearly monodisperse spheres is studied both in batch sedimentation and in shear between concentric rotating cylinders. We apply a continuum constitutive equation based on the diffusive flux model augmented with buoyancy terms derived by Acrivos and coworkers and d…