Materials Literature
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We report here the direct synthesis of a hexagonal form of manganese dioxide using mild hydrothermal methods. The reaction of potassium or sodium permanganate in water at 170 °C leads directly to potassium or sodium manganese dioxide, Alk ≈0.25 MnO 2 ·0.6H 2 O, with a R 3̄ m rhombohedral structure like Li x (H 2 O)TiS…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRadical Living Graft Polymerization on the Surface of Polymeric MaterialsWantai Yang and Bengt RånbyView Author Information Department of Polymer Technology, Royal Institute of Technology, 10044 Stockholm, Sweden Cite this: Macromolecules 1996, 29, 9, 3308–3310Publication Date…
The pulsed electroacoustic (PEA) method is widely known to be an excellent method for measuring the space charge distribution that accumulates in thick dielectric materials (1 to 5 mm). We have refined the PEA measurement system for use on thin dielectric materials. With FFT deconvolution to compensate for the frequen…
The temperature- and pressure-driven solid state valence tautomeric transformations of [Co II (3,5DTBSQ) 2 (phen)]·C 6 H 5 CH) and nonsolvated [Co II (3,5DTBSQ) 2 (phen)] have been studied by EXAFS and XANES. When the toluene solvate sample is cooled it converts in the 270−215 K region ( T c = 240 K) from a high-spin…
Abstract The use of synthetic ion‐exchangers (commonly referred to as resins ) to study natural media has steadily increased. These materials allow new and different ways to solve problems that cannot be resolved through usual approaches. A lack of knowledge or limited experience, however, has led to apparent confusio…
We present a theoretical description of polymer adsorption from solution which is based on a mean field approximation but which goes beyond the standard ground state dominance approximation. The properties of the adsorbed polymer chains are described by two coupled order parameters. This allows a description of the ch…
A semiquantitative model is presented for the incorporation of species derived from electrolyte anions into amorphous barrier‐type films formed on aluminum in aqueous electrolytes at ambient temperature. The model relates the film compositions to the concentrations of adsorbed electrolyte anions which form the double‐…
The first key reference source of its kind to feature current information on biomedical applications for titanium and beta-titanium alloys.30 comprehensive peer-reviewed papers from leading experts in the field have been divided into 7 major categories:
The amino acid sequences of two tryptic peptides derived from purified preparations of I1PP2A indicated that this potent heat-stable protein inhibitor of protein phosphatase 2A (PP2A) may be equivalent to putative histocompatibility leukocyte antigens class II-associated protein I (PHAP-I). Experiments using purified…
Two nickel(II) complexes of formula (H(3)dien)(2)[Ni(2)(ox)(5)].12H(2)O (1) and [Ni(2)(dien)(2)(H(2)O)(2)(ox)]Cl(2) (2) (dien = diethylenetriamine and ox = oxalate dianion) have been synthesized and characterized by single-crystal X-ray diffraction. 1 crystallizes in the orthorhombic system, space group Abnn, with a =…
An ensemble of H(CH 2 OCH 2 ) 12 H chains has been studied by molecular dynamics simulations as both melt chains and unperturbed phantom chains as a model system to investigate condensed phase effects on chain conformations of poly(oxyethylene) (POE). In addition, conformations of high molecular weight POE chains in t…
The host/guest chemistry of intercalation systems provides a highly variable potential for synthesis strategies aiming at the controlled preparation of complex organized structures in the nanoscale regime at low temperatures. Specific aspects of actual progress are considered concerning the synthesis and functional mo…
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Platinum-catalyzed hydrosilylation of allyl glycidyl ether (AGE) with octahydridosilsesquioxane ((HSiO1.5)8, T8H) and octakis(dimethylsiloxy)silsesquioxane ((HMe2SiOSiO1.5)8, Q8M8H) provides access to tetra- and octaepoxy-functionalized cubic silsesquioxanes (cubes). The resulting epoxy cubes offer “masked” silica con…
SiO2–ZrO2 and SiO2–TiO2 mixed oxides with various metal contents have been prepared by a non-hydrolytic sol–gel route involving the condensation between chloride and isopropoxide functions at 110 °C. Well condensed, monolithic gels were obtained in one step, without the use of additives. The Si/M ratio of the oxide ma…
The beneficial effect of nitrogen in steels in resistance against localized corrosion, pitting and crevice corrosion is well proven, but not yet fully understood. The results on dissolution of nitrogen steels in acids are controversial, but the dissolution of Fe-N alloys is enhanced compared to pure iron. Many surface…
Extreme non-Arrhenius dependence of the ionic conductivity in optimized fast ion conducting glasses has been observed. When all the chemical factors controlling the ionic conductivity in glass have been optimized, the conductivity fails to reach the values expected, $>0.1$ $(\ensuremath{\Omega}\mathrm{cm}{)}^{\ensu…
Synthesis of the vinyl sulfone and chloroethyl sulfone derivatives of poly(ethylene glycol) (PEG) is described. The chloroethyl sulfone (CES-PEG) is rapidly converted to the vinyl sulfone (VS-PEG) in the presence of base but is stable in water at neutral pH. Reactions with small molecules such as beta-mercaptoethanol…
Five amphiphilic alpha-helical peptides of 18 residues containing a hydrophobic Trp residue as a fluorescence probe were designed. The peptides were made up of hydrophobic Leu and hydrophilic Lys residues of a ratio of 13:5, 11:7, 9:9, 7:11, and 5:13 (abbreviated as Hels 13-5, 11-7, 9-9, 7-11, and 5-13, respectively).…
The crystalline morphology of a relatively high molecular weight isotactic polypropylene (i-PP) ( M w = 18000 g/mol) with well-defined regio- and stereoirregularities is studied by means of atomic force microscopy (AFM), wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and light microscopy. Thi…