Materials Literature
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Small-angle neutron scattering (SANS) was used to examine the melt phase behavior of a heavily branched comb PEE polymer blended separately with two linear PEE copolymers. In this case, PEE refers to poly(ethylene-r-ethylethylene) with 10% ethylene units; therefore, the molecular architecture was the only difference b…
The thermoelectric properties of sintered bodies of NaCo2O4, which is so far the most promising p-type candidate for oxide thermoelectric material, are investigated in terms of their sintering conditions. Double-step sintering, for which single-phase NaCo2O4 obtained by calcination and sintering with addition of 10% e…
Surface-enhanced Raman scattering (SERS) is a process with origins, electromagnetic and chemical. The electromagnetic enhancement consists of the excitation of surface plasmons in the metallic support of the thin film. With only the electromagnetic enhancement mechanism, the surface spectra should not differ from volu…
Glycidyl methacrylate (GMA) was grafted on ethylene–propylene copolymer during melt processing with peroxide initiation in the presence and absence of a more reactive comonomer (coagent), trimethylolpropane triacrylate (Tris). The characteristics of the grafting systems in terms of the grafting reaction yield and the…
The synthesis and structural characterisation of a novel metal polyhedron is reported, involving chromium(III) and isobutyrate; comparison of this product with those obtained using different carboxylates suggests that the leaving group—which can be carboxylate, water or both—strongly influences the structure found.
α-Helix peptides bearing one unit of γ-cyclodextrin (γ-CD) and one or two units of pyrene in their side chain have been designed and synthesized as a novel system of peptide dimerization. The dimer was formed based on inclusion of two pyrene units in the γ-cyclodextrin cavity, and the dissociation of the peptide dimer…
Solid oxide fuel cells that incorporate stabilized‐zirconia electrolytes commonly use the transition‐metal oxide perovskite La 0.875 Sr 0.125 MnO 3+δ as the cathode. While in operation, the cathode can be subjected to significant stresses, because of thermal expansion mismatch between mating components. The mechanical…
Wettability of ceramics with molten silicon have been determined with a sessile drop method. The contact angles between molten silicon and the oxide plates, such as SiO2(s), Al2O3(s), MgO(s) are in the range from 85° to 88°. Contact angle between SiO2(s) and Si(l) was further investigated from the meniscus shape of mo…
In a search for new anti-pruritic drugs we screened methanol extracts of 33 herbal medicines which have been used for cutaneous diseases for their antipruritic activity using substance P (SP) as a pruritogen in mice. When administered perorally 30 min before SP injection, methanol extracts of 6 of these herbal medicin…
A Generalized Equivalent‐Circuit Model for Electroactive Monolayers Exhibiting a Fixed Redox Potential and a Distribution of Electron‐Transfer Rate Constants I. Square Distributions, Li, Jinghong, Schuler, Kaleta, Creager, Stephen E.
Complexes trans-[MH(CN)L2] 1 {L = PPh2(CH2)nPPh2, n = 1 (dppm), 2 (dppe) or 3 (dppp), and PR2CH2CH2PR2, R = Et (depe) or para-tolyl (dtpe), M = Fe (for dppe, depe and dtpe only), Ru or Os} were prepared by displacing with cyanide the halide from trans-[MH(X)L2], X = Br or Cl, or dihydrogen from trans-[Ru(H2)H(dppe)2]B…
The hyperbranched copolymers were obtained by the atom transfer radical copolymerization of p-(chloromethyl)styrene (CMS) with N-cyclohexylmaleimide (NCMI) catalyzed by CuCl/2,2′-bipyridine (bpy) in cyclohexanone (C6H10O) or anisole (PhOCH3) with CMS as the inimer. The influences of several factors, such as temperatur…
Copolymers composed of 11-(4‘-cyanobiphenyloxy)undecyl acrylate (11CBA) and acrylic acid (AA), poly(11CBA- co -AA)s, were prepared by changing their molar ratio, and their structures were investigated under various temperatures. From wide- and small-angle X-ray studies, it was found that poly(11CBA) and poly(11CBA- co…
The percent cover and composition of benthic macroalgal growths and the structure of epilithic diatom communities were analyzed in 1995 at four sites in a stream flowing through a cultivated field near Kintore, Ontario, Canada. The dominant epilithic diatom taxa did not differ greatly among sites. However, a correspon…
This paper describes the engineering of patterned calcite films using templating by self-assembled monolayers (SAMs) supported on micropatterned mixed metal substrates. The substrates were prepared by deposition of one metal (Au, Ag) onto the surface of another metal (Au, Ag) through a stencil or photoresist masks. Th…
The elution curves of size exclusion chromatography for nonlinear polymers formed through random branching and crosslinking of long polymer chains were simulated with a Monte Carlo method. We considered two types of measured molecular weight distributions (MWDs): (1) the MWD calibrated relative to standard linear poly…
A new monomer, 2,5-bis(4-carboxy methylene phenyl)-3,4-diphenyl thiophene (V) has been synthesized and characterized by physical and spectroscopic methods. A series of eight aromatic–aliphatic polyamides was prepared from the (V) and different aromatic diamines using Yamazaki's direct phosphorylation reaction. The pol…
Development of the morphology of vicinal (0001) surfaces of α-alumina, induced by annealing in air at 1500 °C, was studied by AFM. Our investigation shows that the resulting surface morphology depends on both the duration of thermal treatment and the surface misorientation relative to crystallographic directions. The…
The combination of two different molecular architectures, the rather rod-like para-cyclophanes and two half disc-like 1,3-diketonate units fused viaortho-palladation leads to new liquid crystalline materials with a quite unusual molecular shape. By increasing the number of attached alkyl chains a discontinuous transit…
Dielectric dispersion studies of real ferroelectric crystals in the phase transition region indicate a deviation from the Debye response of pure crystals. In this paper the question of the origins of this deviation is addressed in terms of a probabilistic approach. An effort to understand the relaxation mechanism unde…