Materials Literature
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Orientational dynamics in a simple model of infinitely thin hard needles, initially proposed by Rubinstein and Obukhov [1], are investigated by molecular dynamics simulations. The center-of-mass coordinates of the needles are fixed on a regular fcc lattice. The statics of the system is analytically known, yielding a g…
Abstract Two series of triblock copolymers of poly(ethylene glycol) (PEG, number‐average molecular weight M n = 6000) and poly( L ‐lactide) (PLLA) or poly( D ‐lactide) (PDLA) were prepared by ring‐opening polymerization of lactide initiated by PEG end groups using stannous octoate as a catalyst, either in refluxing to…
Abstract This study reports on the progression of processes occurring in polymer blends during mixing. For the polymer pellet blends studied, an abrupt phase inversion was observed simultaneous with attainment of maximum torque in the batch mixer. A four‐step phase inversion mechanism is described as predominant where…
Extended dendritic, ladder, and cross‐linked polyradical frameworks empolying π‐conjugated backbones (e.g. see Fig.) show promise in the development of ferromagnetic polymers. Recent progress in this field is reviewed and the various classes of materials, for example polyacetylene‐, or polyphenylenevinylene‐based radi…
Anisotropic charge transport, or polarized photo‐ and electroluminescence are possible applications for materials combining the optical properties of arylenevinylene polymers with the characteristic orientational order of the liquid‐crystalline state. Thermally stale, soluble materials with a broad mesophase, which ca…
We preesnt a theory for the effect of polymer nonideality on the phase behavior of a hard-sphere colloid plus nonadsorbing polymer mixture. Starting from the behavior at the \ensuremath{\theta} temperature, which has been treated previously within a mean-field framework [H. N. W. Lekkerkerker et al., Europhys. Lett. 2…
We present results for sonoluminescent (SL) radiation from a strongly modulated air bubble in water. The SL pulse is due to high temperatures in the bubble that are produced by the collapse of a shock wave. The dependence of SL radiation on acoustic pressure and initial bubble size is discussed, as well as the inclusi…
The properties of magnetic solids constructed from cyanometalate building blocks are reviewed. Most of these solids adopt face-centered cubic lattices in which adjacent metal centers are linked by CN bridges; they are analogues of the long-known inorganic coordination polymer Prussian blue. Ferromagnets, ferrimagnets,…
Dysprosium‐doped glasses were prepared in the system of gallium‐based sulfide, tellurite, zirconium‐baed and indium‐based fluorides and their optical properties were studied. From the absorption cross sections of five f‐f bands, three Judd‐Ofelt parameters, ω t ( t = 2, 4, 6), of Dy 3+ ion were determined. The composi…
Structure analysis and measurement of resistivity under both isostatic pressure smaller than 1.1 GPa and magnetic field of 1 T were carried out for rhombohedral ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathit{A}}_{\mathit{x}}$${\mathrm{MnO}}_{3}$ (A=Na, K, Rb, and Sr). A close relationship was confirmed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid Solution of CdyZn1-yS Nanosize Particles Made in Reverse MicellesJ. Cizeron and M. P. PileniCite this: J. Phys. Chem. 1995, 99, 48, 17410–17416Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1995https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Magnetic Behavior of a New Two-Dimensional Antiferromagnetic Manganese(II)-.mu.-1,3-Azido SystemAlbert Escuer, Ramon Vicente, Mohamed A. S. Goher, and Franz A. MautnerCite this: Inorg. Chem. 1995, 34, 23, 5707–5708Publication Date (Print):November 1, 1995Public…
NIPP-1 was originally isolated as a potent and specific nuclear inhibitory polypeptide (16-18 kDa) of protein phosphatase-1. We report here the cDNA cloning of NIPP-1 from bovine thymus and show that the native polypeptide consists of 351 residues and has a calculated mass of 38.5 kDa. The bacterially expressed centra…
Abstract Ceramic-matrix composites (CMCs) are being developed for a number of high-temperature and high-performance applications in industrial, aerospace, and energy conservation sectors. This article focuses on processing, fabrication, testing, and characterization methods of CMCs, namely, discontinuously reinforced…
The effect of carbon black particle size and structure on the equilibrium volume swelling and elastic recovery of polychloroprene rubber immersed in hydraulic oil and subjected to uniaxial compression stress was investigated in this study.
The paper deals with the degradation phenomena produced on polypropylene films by corona discharges with streamers in air at different humidity levels. The attention is focused on the formation of crystals on the surface of these films. In the case of the thin films under consideration, these crystals appear in about…
The mechanical properties of a novel laminar composite made by tape casting have been studied. The composite consists of three layers in which an inner core of pure molybdenum disilicide (MoSi 2 ) is sandwiched between two layers of MoSi 2 reinforced with alumina platelets. Monolithic MoSi 2 exhibits poor room‐tempera…
Chloroaluminum phthalocyanine (ClAlPc) thin films, vacuum sublimed on SnO2-covered glass substrates, were exposed to KCl solutions of various pH values (from 2.0 to 8.0) in the fluid cell of an atomic force microscope (AFM). The evolution of the surface morphology of the film was followed in situ. Complementary experi…
All articles of this category New supramolecular ferrocene derivatives 9-16 have been produced from precursors synthesised from alumina-catalysed Knoevenagel reactions of ferrocenecarboxaldehyde. The UV-Vis spectra for each compound revealed solvatochromic behaviour, which augur well for these materials to display non…
A new method for fabricating analog light modulators on VLSI devices is described. The process is fully compatible with devices fabricated by commercial VLSI foundries, and the assembly of the modulator structures requires a small number of simple processing steps. The modulators are capable of analog amplitude or pha…