Materials Literature
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The electrical resistance of ferromagnetic/normal-metal (F/N) heterostructures depends on the nature of the junctions which may be tunnel barriers, point contacts, or intermetallic interfaces. For all junction types, the resistance of disordered F/N/F perpendicular spin valves as a function of the angle between magnet…
A ferromagnetic phase, characterized by electron carriers and a high temperature colossal magnetoresistance (HTCMR) dependent on the magnetic moment, and a semiconducting phase, characterized by hole carriers and a low temperature CMR (LTCMR), are observed in La$_{1-x}$Ca$_{x}$MnO$_3$ thin films by the van der Pauw me…
Both the rate and extent of ligand place exchange reactions between the hexanethiolate monolayer of Au(140) monolayer protected clusters (C6 MPCs) and dissolved 6-mercapto-1-hexanol thiol (HOC6SH) increase with increasing positive electronic charge on the Au cluster core. The rate constant of the ligand place exchange…
High-energy x-ray-diffraction experiments performed on rhombohedral $\mathrm{Pb}({\mathrm{Zn}}_{1/3}{\mathrm{Nb}}_{2/3}{)}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ $(\mathrm{PZN}\ensuremath{-}x%\mathrm{PT})$ crystals with $x=4.5%$ and 8% show that an electric field applied along the [001] direction induces…
Classical molecular dynamics simulations have been conducted to investigate the atomic-scale friction and wear when hydrogen-terminated diamond (111) counterfaces are in sliding contact with diamond (111) surfaces coated with amorphous, hydrogen-free carbon films. Two films, with approximately the same ratio of sp(3)-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral Lanthanide Complexes: Coordination Chemistry and ApplicationsHelen C. AspinallView Author Information Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, U.K. Cite this: Chem. Rev. 2002, 102, 6, 1807–1850Publication Date (Web):May 22, 2…
The thermal dependence of the lamellar thickness ( L p ) and the thickness of crystalline layers ( L cryst ) of linear polyethylene single crystals has been revisited. LPE fractions with different average molecular weights were crystallized at the same temperatures to avoid the delicate problem of an arbitrary choice…
Abstract A chitosan (CTN)/silica‐supported nanosized palladium catalyst was obtained from a silica‐supported chitosan palladium complex through a complex transition method. An adsorption model was employed to simplify the structure of the di‐supporter. It was indicated that when the polymer coil adsorbed on the silica…
Seven cDNA encoding silkworm fibroin homologues were cloned from a carp ovarian cDNA library. The encoded proteins are denoted as carp ovarian fibroin-like substances (FLS). FLS contain a repetitive domain consisting of tandem repeats of dipeptide of Gly-X, where X may be any amino acid. Each FLS has its own unique re…
Abstract 2,3‐Diketocarboxymethylcellulose was prepared by the oxidation of carboxymethylcellulose (CMC) with potassium permanganate in alkaline solutions (pH ≥ 12) with a yield of 98.1%. IR spectroscopy and microanalysis have elucidated the chemical structure of the synthesized macromolecule (CMCK). A tentative reacti…
Time-of-flight quasielastic neutron scattering experiments have been performed on solid solutions of Na2SO4 and Na3PO4 in order to examine the reorientational anion motion in the picosecond range. The obtained data were analysed on the basis of the Q-dependent quasielastic intensity. Comparing the predictions of diffe…
Abstract Poly[( R,S )‐3‐hydroxybutyrate] oligomers containing dihyroxyl (PHB‐diol), dicarboxylic acid (PHB‐diacid) and hydroxyl‐carboxylic acid (a‐PHB) end functionalities were obtained by the anionic polymerization of β‐butyrolacton (β‐BL). Ring opening anionic polymerization of β‐BL was initiated by a complex of 18‐…
Abstract Raman and surface‐enhanced Raman scattering (SERS) spectra of 3‐phenylpropionic acid on silver colloids at several concentrations and pH values were recorded. The analysis of the spectra indicated that 3‐phenylpropionic acid links to the metal through its carboxylate group, keeping the aromatic ring almost pe…
The effect on the nematic to smectic-A transition in octylcyanobiphenyl (8CB) due to dispersions of hydrogen-bonded silica (aerosil) particles is characterized with high-resolution x-ray scattering. The particles form weak gels in 8CB creating a quenched disorder that replaces the transition with the growth of short-r…
Abstract The adsorption behavior of 4,4′‐dicyanobiphenyl (DCBP) on Ag and Au nanoparticle surfaces was studied by surface‐enhanced Raman scattering (SERS). The absence of the ring CH band denoted a flat orientation of the biphenyl ring on Ag and Au. The red shift of the ν 8a band indicated a direct ring π‐orbital inte…
In this paper we report modifications of the surface enhanced Raman scattering (SERS) spectra with film thickness of carbon single-walled nanotubes (SWNTs). The decrease of film thickness reveals an increased degree of disorder, which is interpreted in terms of degradation of the single-walled nanotubes and the format…
Abstract To facilitate the characterization of polymer networks, a comparison was made between branching theory and Monte Carlo simulations using an amine‐cured epoxy as an example for step‐growth polymer networks. The primary objective was the validation of the simulation results with the existing statistical theorie…
Abstract The mechanical properties of flyash‐filled natural rubber were investigated and compared with those filled with calcium carbonate. A number of composites with varying percentage of the fillers were prepared using a two‐roll mill and molded on compression molding press. Specimens were subjected to mechanical t…
The average magnetic susceptibilities for trivalent rare earth (R3+) ions in polycrystalline tetragonal rare earth oxybromides (ROBr, R = Ce–Nd, Sm, Eu, and Tb–Yb) were measured between 2 and 298 K. The susceptibilities of all ROBr follow the paramagnetic Curie–Weiss behaviour down to low temperatures except for SmOBr…
Abstract In vitro degradation of poly( L ‐lactic acid) (PLLA) fibers was studied by incubating the fibers in phosphate buffered saline (pH 7.4) at 37°C for 35–45 weeks. Three kinds of PLLA fibers with different diameters and different initial viscosity‐average molecular weights were tested. The viscosity‐average molec…