Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A strictly anaerobic thiosulfate-reducing bacterium was isolated from a corroding offshore oil well in Congo and was designated strain SEBR 4207T. Pure culture of the strain induced a very active pitting corrosion of mild steel, with penetration rates of up to 4 mm per year. This constitutes the first experimental evi…
How copolymers affect the crystallization of inorganic materials has been studied, using as an example the effect of poly(ethylene oxide)‐ block ‐poly(methacrylic acid) (PEO‐ bl ‐PMAA) on calcite (CACO 3 ). It si shown that the presence of PEO‐ bl ‐PMAA can lead to a drastic alteration of the crystal habit of calcite,…
Diarylethene derivatives, which have an optically active l - or d -menthyl group at the 2-position of benzo[ b ]thiophene ring, were synthesized. Irradiation with 450 nm light in solution led to the formation of diastereomer pairs of the closed-ring forms. The product ratio of the diastereomers was dependent on solven…
Abstract The shear and compressive properties of aggregated alumina particles are determined as functions of volume fraction and the strength of the interparticle attraction. Over a range of volume fractions, yield stresses, τ y , elastic moduli, the strain delimiting the extent of the linear elastic response, and com…
We have used powder X-ray diffraction, diffuse reflectance Fourier-transform infrared, 29 Si MAS NMR, N 2 adsorption, and transmission electron microscopy to examine the role of the concentration of silica, the surfactant, and the reaction time in the synthesis of high-quality silica mesoporous molecular sieve MCM-48.…
We report the synthesis and electrochemical polymerization of a series of bisheterocycle- N -substituted carbazoles. These monomers exhibit low peak oxidation potentials ( E p,m ) which range from 0.15 to 0.46 V vs Ag/Ag +, indicating facile polymerization. Repeated scan electrochemical polymerization for these monome…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficiency of Proton Transfer Catalysis in Models and Enzymes†Anthony J. KirbyView Author Information University Chemical Laboratory, Cambridge CB2 1EW, U.K. Cite this: Acc. Chem. Res. 1997, 30, 7, 290–296Publication Date (Web):July 15, 1997Publication History Received6 Marc…
Cys319 is located on a mobile flap covering the active site of Klebsiella aerogenes urease but does not play an essential role in catalysis. Four urease variants altered at position C319 range from having high activity (C319A) to no measurable activity (C319Y), indicating Cys is not required at this position, but its…
Positively charged polydiallyldimethylammonium chloride, P, was found to bind strongly to the surface of anionic montmorrillonite, M, platelets in aqueous dispersions up to a saturation (estimated to correspond to the binding of five P to one 1.0 nm × 200 nm M platelet) beyond which reversible physisorption occurred.…
Very highly conductive Au films on glass substrates have been prepared by stepwise, layer-by-layer immobilization of 11-nm diameter colloidal Au particles and a short organic cross-linker. Particle coverage, optical spectra, nanometer-scale topography, and electrical resistance have been measured as a function of the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDendrimers as Controlled Artificial Energy AntennaeArie Bar-Haim, Joseph Klafter, and Raoul KopelmanView Author Information School of Chemistry, Tel Aviv University Tel Aviv 69978, Israel Department of Chemistry, University of Michigan Ann Arbor, Michigan 48109-1055 Ci…
Polycrystalline samples of were oxidized in air in the 900 to 1400°C temperature range. The oxidation was parabolic with parabolic rate constants, k p , that increased from to as the temperature increased from 900 to 1400°C, respectively, which yielded an activation energy of 370 ± 20 kJ/mol. The scale that forms was…
The effect of oxygen on the potential of electrodes coated with a thin layer of various conducting polymers and immersed in aqueous neutral buffer solution has been studied. A theoretical equation describing the dependence of the potential on the concentration of oxygen has been derived and shown to be in conformity w…
Polyaniline thin films produced by the evaporative deposition of emeraldine on Cu(110) and on evaporated Au surfaces have been characterized using high-resolution electron energy loss spectroscopy (HREELS). Ultrathin films (less than 100 Å) doped with HCl exhibited plasma frequencies in the far-IR, suggesting a high d…
No abstract available.
To investigate the potential of gadolinium (Gd)-ethoxybenzyl (EOB)-diethylenetriamine-pentaacetic acid (DTPA) for evaluating liver function, chemically induced hepatitis animal models were studied. The rats in group 1 underwent intraperitoneal administration of 2.0 ml/kg and those in group 2 underwent intraperitoneal…
Measurements of the entropy change at the martensitic transition of two composition-related sets of Cu-Al-Mn shape-memory alloys are reported. It is found that most of the entropy change has a vibrational origin, and depends only on the particular close-packed structure of the low-temperature phase. Using data from th…
A novel water-soluble polyaniline has been synthesized by horseradish peroxidase catalyzed oxidative free-radical coupling of 2,5-diaminobenzenesulfonate. The polymerization reaction is rapid, and the average molecular weight of the resulting polymer is on the order of 18 000. Unlike the sulfonated polyanilines synthe…
The first example of spin crossover iron(II) complexes based on dihydrobis(1-pyrazolyl)borate are presented here. The complexes {Fe[H(2)B(Pz)(2)](2)(phen)} (phen = 1,10-phenanthroline), 1, and {Fe[H(2)B(Pz)(2)](2)(bipy)} (bipy = 2,2'-bipyridine), 2, have been synthesized and their structures determined by X-ray diffra…
An anharmonic correlated Einstein model is derived for local vibrational amplitudes in x-ray-absorption fine structure (XAFS) that takes into account all near neighbors of absorber and backscattering atoms. The model is based on quantum thermodynamic perturbation theory and includes anharmonic effects based on empiric…