Materials Literature
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A colossal shift of the maximum resistivity temperature induced by oxygen isotope exchange was registered for 60 nm thick films of the solid solution La0·35Pr0·35Ca0·3MnO3 on perovskite substrates. The magnitude of the effect depends on lattice strain resulting in the largest shift for the film on LaAlO3: the 16O samp…
Monolayers of oligothiophene-substituted alkylsilanes, chlorodimethyl(11-(3-(2,2‘bithienyl))undecyl)silane and chlorodimethyl(11-(3‘-(2,2‘:5‘,2‘ ‘-terthienyl))undecyl)silane, are subject to electrochemical oxidation within the monolayer to afford more highly conjugated oligomers with lower redox potentials. The electr…
The complex (6,13-bis(ethoxycarbonyl)-5,14-dimethyl-1,4,8,11-tetraazacyclotetradeca-4,6,12,14-tetraenato(2−))iron(III) iodide, 3 (chemical formula C 18 H 26 O 4 N 4 FeI·0.5 C 7 H 8 ), has been characterized by X-ray crystallography ( a = 16.063(3) Å, b = 15.895(3) Å, c = 19.703(4) Å, β = 107.11(3)°; monocline; I 2/ a;…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Self-Assembled Electric Conductive Network in Short Carbon Fiber Filled Poly(methyl methacrylate) Composites with Selective Adsorption of PolyethyleneGuozhang Wu, Shigeo Asai, and Masao SumitaView Author Information Department of…
A critical review is given of the physics of colossal magnetoresistance (CMR) materials (manganites and other degenerate ferromagnetic semiconductors). The basic idea is that their specific properties (the resistivity peak close to T C, CMR and so on) are not related to the electron{lattice interaction but are caused…
Miscibility for blends of isotactic polypropylene (PP) and ethylene- d 4 −propylene random copolymer (EPR)s prepared by copolymerization of propylene and perdeuterated ethylene with metallocene catalyst has been investigated by small-angle neutron scattering (SANS). SANS experiments were conducted for the blends of PP…
Block copolymer ionomers were prepared by lightly sulfonating the polystyrene (PS) blocks of diblock and triblock copolymers of PS and poly(ethylene- alt -propylene) (PEP), followed by neutralization of the sulfonic acid groups with either sodium or zinc. The block copolymers contained between 10 and 50 wt % PS, and a…
Three new carbazole-based diamines, 3,6-diaminocarbazole ( 2 ), 3,6-diamino- N -phenylcarbazole ( 4 ) and N -(4‘-aminophenyl)-3-aminocarbazole ( 7 ), were prepared from carbazole or N -phenylcarbazole. Homopolyimides and copolyimides derived from these three diamines as well as 4,4‘-diamineodiphenyl ether (DDE), with…
A series of new well-defined acidic poly(2,7-fluorene) derivatives have been synthesized by palladium-catalyzed Suzuki couplings. Upon deprotonation (i.e., base doping ), these conjugated polymers generate stable polymeric anions counterbalanced by alkali metal cations. The resulting polymeric salts exhibit interestin…
Tris( o -phenylenedioxy)cyclotriphosphazene was found to form hexagonal host−guest inclusion adducts (clathrates) with the polymers: cis -1,4-polybutadiene, trans -1,4-polyisoprene, polyethylene, poly(ethylene oxide), and polytetrahydrofuran. Single-crystal X-ray diffraction studies of both the polyethylene and poly(e…
In the Ln1- x A x MnO3 pseudoperovskites in which Ln is a lanthanide and A an alkaline-earth atom, an intrinsic colossal magnetoresistance (CMR) occurs in an O-orthorhombic phase near an O'-orthorhombic/O-orthorhombic phase boundary. For a fixed ratio Mn(IV)/Mn = 0·3, the transition through the O phase from localised-…
The solubility of chicken egg white lysozyme crystallized in the tetragonal form was measured in sodium chloride solutions from 1.6 to 30.7 °C, using a miniature column solubility apparatus. Sodium chloride solution concentrations ranged from 1 to 7% (w/v). The solutions were buffered with 0.1 M sodium acetate buffer,…
Theoretical calculations for colloidal charge-stabilized and hard sphere suspensions show that hydrodynamic interactions yield a qualitatively different particle concentration dependence of the short-time self-diffusion coefficient. The effect, however, is numerically small and hardly accessible by conventional light…
A novel fulleride Sm6C60 has been synthesized using high temperature solid state reaction. The Rietveld refinement on high resolution synchrotron X-ray powder diffraction data shows that Sm6C60 is isostructural with body-centered cubic A6C60 (A=K, Ba). Raman spectrum of Sm6C60 is similar to that of Ba6C60, and the fre…
Raman shift dependence of charge transfer is studied in the two fulleride families of AxBa3C60 (x=0,3; A=K,Rb) and KxSm2.75C60 (x=0,3.25). It is found that the Raman spectra are essentially identical to each other for all ternary fullerides, The results show a crossover point at the boundary of t1u and t1g bands for t…
Raman spectra are reported for Ba doped fullerides, BaxC60(x=3,4,and 6). The lowest frequency Hg modes split into five components for Ba4C60 and Ba6C60 even at room temperature, allowing us a quantitative analysis based on the electron-phonon couping theory. For the superconducting Ba4C60, the density of states at the…
In order to provide a firmer base for efforts to interpret the different fragilities of liquids (i.e., the different deviations from simple Arrhenius temperature dependence of relaxation processes), a new and simple one-scan method of quantifying fragility is described and verified. It is based on detecting, by simple…
We review the reasons that make superconductivity unlikely to arise in a ferromagnet. Then, in light of the report by Tallon and collaborators that RuSr2GdCu2O8 becomes superconducting at approximately 35 K which is well below the Curie temperature of 132 K, we consider whether the objections really apply to this comp…
Luminescent SiO2 films containing Ge nanocrystals (nc-Ge) are synthesized by implanting Ge ions into SiO2 films thermally grown on crystalline silicon, and the nc-Ge density was controlled by Ge+ implantation doses. The current–voltage measurements of their metal–oxide–semiconductor structures illustrate that the dens…
We have constructed a multilayered composite material consisting of alternating layers of rf-sputtered barium titanate and spin-coated polycarbonate containing a third-order nonlinear optical organic dopant. The effective nonlinear susceptibility of the composite describing the quadratic electro-optic effect was measu…