Materials Literature
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The crystal structure of the new mixed oxalate Y(H2O)Cs(C2O4)2 has been solved from powder X-ray diffraction data. The compound is isostructural with the related yttrium ammonium oxalate. It crystallises with monoclinic symmetry, a = 8.979(2), b = 6.2299(8), c = 8.103(1) Å, β = 90.05(2)° and V = 453.3 Å3, in space gro…
Dynamics of a spherical bubble cloud with nuclei size distribution is investigated numerically when the surrounding pressure is decreased from 50kPa to 10kPa and then increased to 50kPa stepwisely. A set of governing equations for the motion of bubble cloud are formulated combining the averaged equation and the equati…
We have studied a system of discotic particles with a central transverse dipole using Monte Carlo (MC) computer simulations at constant pressure. We have investigated several temperatures corresponding to nematic and columnar liquid crystal phases and determined the molecular and dipolar organizations. Low temperature…
A family of Mannich bases were prepared from the reaction of 2,2-bis-(4-hydroxyphenyl)propane (bisphenol A or BPA), formaldehyde, and poly(oxyalkylene)diamines at 1 : 1 : 1 or 1 : 2 : 2 molar ratio. By varying the molar ratio of bisphenol A to amine and the chemical structures of poly(oxyalkylene)diamines, a series of…
Mesoporous dimethylsiloxane-incorporated silica materials are synthesized which exhibit high surface areas, regular mesopores, thick walls, high hydrophobicity and high mechanical strength.
Composites produced during the in situ chemical polymerization of aniline on top of a poly(ethylene terephthalate) (PET) film, in different conditions, were studied by open-circuit potential (Voc), ultraviolet-visible, and infrared spectroscopy, electrical conductivity measurements, scanning electron microscopy, and a…
We report here on poly(amino acid)-based bioadhesives with potential to bond to soft tissues. The systems investigated included homopolymer poly(amino acids), mixtures of poly(amino acids) and amino acids, and blends of different poly(amino acids). Adhesive performance was tested in tension on glass surfaces, chondroi…
The microhardness, H, of carbon black–polycarbonate and carbon black–low-density polyethylene composites was investigated. Two types of microadditives with different average particle sizes were employed. It has been shown that the morphology of the polymeric matrix conspicuously influences the hardness dependence of t…
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…