Materials Literature
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Abstract The common formalism of quantitative XPS can be easily modified, with two additional correction factors β eff and Q x , to account for the elastic scattering effects. These corrections, for a given solid, depend on photolectron line, the radiation used and the XPS configuration. The database compiled in the p…
Abstract Expressions for the kinetics of grafting chains from a pure end‐functional polymer melt to a reactive interface are derived under the assumption that the free energy of reaction is very large and negative. Two cases are considered: a case where the grafting is controlled by diffusion of free end‐functional ch…
An insoluble catalytic assembly consisting of a silicate xerogel covalently modified with phenyl groups and quaternary ammonium–polyoxometalate ion pairs was used to catalyse the oxidation of alkenes with 30% aqueous hydrogen peroxide in the absence of an organic solvent.
Journal URL: http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=%20PC/PC-00a&sessionid=85597106; http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=journal&sessionid=85597106
Treatment of [Mr4O2(OAc)6(py)2(dbm)2]1(py = pyridine, Hdbm = dibenzoylmethane) in hot MeCN with Me3SiX (X = N3–, OCN –) yields [Mn4O3X(OAc)3(dbm)3] containing extremely rare η1, µ3-N3– or -OCN– groups; alternating-current magnetic susceptibility studies reveal unusual magnetic relaxation effects and indicate these spe…
The segmental bidentate–tridentate ligand L2 reacts with LnIII and ZnII in acetonitrile to give the first self-assembled heterodinuclear d–f triple-helical complexes [LnZn(L2)3]5+(Ln = La, Eu), as determined from solution-phase studies.
Abstract This article describes the results of laboratory batch solubility experiments with five chlorinated solvents (chloroform, carbon tetrachloride, 1,1,1-trichloroethane, trichloroethylene, and tetrachloroethylene) present alone or in binary or ternary mixtures. The measured aqueous solubility values of the pure…
The synthesis of mesoporous tin-silicates analogous to MCM-41 is reported, for which characterization studies indicate the incorporation of tin in the framework; the Sn-MCM-41 samples have excellent catalytic properties in the selective oxidation of aromatics and hydroxylation of phenol and 1-naphthol with peroxides.
Various aerobic Gram-negative bacteria have been examined for their ability to use 4-hydroxybutyrate and 1,4-butanediol as carbon source for growth. Alcaligenes eutrophus strains H16, HF39, PHB-4 and Pseudomonas denitrificans 'Morris' were not able to grow with 1,4-butanediol or 4-hydroxybutyrate. From A. eutrophus HF…
A new siliceous porous material of high BET surface area is derived from an intercalation of octylamine and tetraethylorthosilicate into the layered silicic acid of ilerite; the resultant pillared material has a BET surface area of over 1000 m2 g–1 at 600 °C and 580 m2 g–1 even at 900 °C.
Polymers deteriorate by a number of mechanisms. In the lifetime of a polymer, deterioration may proceed gradually or rapidly. During processing, a polymer is melted and formed to a desired shape; it undergoes some deterioration due to the extreme temperature and mechanical stress. For example, polymer chains may ruptu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXANES Spectroscopic Studies of Evaporated Porphyrin Films: Molecular Orientation and Electronic StructureS. Narioka, H. Ishii, Y. Ouchi, T. Yokoyama, T. Ohta, and K. SekiCite this: J. Phys. Chem. 1995, 99, 4, 1332–1337Publication Date (Print):January 1, 1995Publication Histo…
The Cretaceous record of the diatoms presented here outlines our understanding of their early morphological development. Recent documentation of well preserved Lower Cretaceous (Aptian/Albian) diatom assemblages provides a window into the early history of the diatoms and serves as a base for comparing their subsequent…
Abstract
A new method is presented of partial discharge data analysis for the investigation of space charge and degradation phenomena in high-voltage insulation systems. The basic principles of the pulse-sequence-analysis (PSA) are illustrated and the characteristic differences with regard to standard procedures that have been…
Low protein adsorbing polymer films have been prepared with which to fabricate intravenous containers, designed for compatibility with low concentrations of protein drugs. The material is economically manufactured utilizing physical melt blending of water-soluble surface-modifying polymers (PEO, PEOX, PVA, and PNVP) w…
The chloroplast genome consists of homogeneous circular DNA molecules. To date, the entire nucleotide sequences (120-190 kbp) of chloroplast genomes have been determined from eight plant species. The chloroplast genomes of land plants and green algae contain about 110 different genes, which can be classified into two…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThrough-Bond and Long-Range Ferromagnetic Spin Alignment in a .pi.-Conjugated Polyradical with a Poly(phenylenevinylene) SkeletonHiroyuki Nishide, Takashi Kaneko, Takeshi Nii, Kohya Katoh, Eishun Tsuchida, and Kizashi YamaguchiCite this: J. Am. Chem. Soc. 1995, 117, 1, 548–5…
Lysozyme structures at six different temperatures in the range 95-295 K have been determined using X-ray crystallography at a resolution of 1.7 A. The crystals at lower temperatures had a 7.4% decrease in the unit-cell volume. The volume change was discontinuous with the volume being near 238 000 A(3) from 295 to 250…
The self-assembly, by means of a slippage procedure, of three novel rotaxanes incorporating, respectively, one, two and three bisparaphenylene-34-crown-10 macrocyclic components and a single branched component, consisting of three bipyridinium units attached covalently to a 1,3,5-trisubstituted benzene central core an…