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。
The preparation, characterization, and luminescence of yttrium‐based phosphors such as europium activated yttrium oxide (red) and terbium activated yttrium aluminate (green) by sol‐gel processes is presented. The sols of yttrium hydroxide were synthesized by various routes. It was found that the sols obtained through…
First hyperpolarizabilities of a large number of push−pull substituted conjugated systems with heteroaromatic spacers have been calculated. The static, nonresonant components were computed at the ab initio level (4-31G basis) using the coupled perturbed Hartree−Fock approach and at the AM1 level employing the finite f…
Ferroelectric composites are now an established alternative to conventional ferroelectric ceramic materials and to the more recently discovered ferroelectric polymers. These materials due to their unique blending of polymetric properties of mechanical flexibility, formability and low cost with high electro-active prop…
A novel class of catalysts for alkane oxidation with molecular oxygen was examined. N-Hydroxyphthalimide (NHPI) combined with Co(acac)(n)() (n = 2 or 3) was found to be an efficient catalytic system for the aerobic oxidation of cycloalkanes and alkylbenzenes under mild conditions. Cycloalkanes were successfully oxidiz…
The deposition of cerium‐rich films on copper under cathodic polarization was studied as a model system for understanding the mechanism of corrosion inhibition of copper‐containing aluminum alloys. Deposition was also studied on gold and iron for comparison with copper. Inhibition of corrosion of the aluminum alloys i…
An FTIR and quadrupole mass spectroscopic study of CO adsorption and oxidation with 16 O 2 and 18 O 2 is presented together with coadsorption experiments of CO and water on gold supported on ZnO and TiO 2 . The experimental results are closely related to those presented in the parallel paper on copper catalysts suppor…
Circumstances leading to twisting crystallographic orientation in banded polymer spherulites are analyzed, both from the standpoint of qualitative morphology and of more quantitative measurement and calculation. Particular attention is paid to linear polyethylene, for which the most extensive information is available,…
The sonochemical decomposition of volatile organometallic compounds produces high surface area solids that consist of agglomerates of nanometer clusters. For iron pentacarbonyl and tricarbonylnitrosylcobalt, nanostructured metals and alloys are formed; for molybdenum hexacarbonyl, the metal carbide is produced. These…
Hexagonal silica–surfactant nanocomposite films are successfully prepared by a novel sol–gel process in which alkyltrimethylammonium salts are directly dissolved into pre-hydrolysed tetramethoxysilane.
A novel series of polyether dendrimer segments (dendrons) end-capped with pyrenyl, naphthyl, or methyl groups has been prepared by a convergent growth method. Steady-state fluorescence measurements indicate the absence of intramolecular naphthalene excimer in the naphthyl-capped dendrons. However, in the pyrenyl-cappe…
Recent advances in the study of Aurivillius phases (Bi 2 A n -1 B n O 3 n +3, n = 1−5) as oxide ion conductors are presented. The structures of modified Aurivillius phases containing extrinsic oxygen vacancies as well as Aurivillius phases containing intrinsic oxygen vacancies are surveyed. A detailed discussion of th…
Bacterial Attachment in Aquatic Environments: A Diversity of Surfaces and Adhesion Strategies (M. Fletcher). Bacterial Interactions with Surfaces in Soils (A. Mills & D. Powelson). Adhesion as a Strategy for Access to Nutrients (K. Marshall). Adhesion to Biomaterials (M. Mittelman). Adhesion in the Rhizosphere (A. Mat…
The effect of polyaniline deuteration on the Raman spectra of this polymer has been studied in detail. Four types of samples have been prepared: nondeuterated polyaniline, polyaniline deuterated selectively on the ring, polyaniline deuterated selectively on nitrogen, and polyaniline deuterated both on the ring and on…
The film thickness dependence of surface structure for immiscible polystyrene/poly(methyl methacrylate) (PS/PMMA) films was investigated on the basis of atomic force microscopic observation and X-ray photoelectron spectroscopic measurement. In the case of the PS/PMMA film of 25 μm thickness, the air−polymer interfacia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor Surface Reconstruction: The Structural Chemistry of Two-Dimensional Surface CompoundsCharles B. DukeView Author Information Xerox Wilson Center for Research and Technology, 800 Phillips Road 0114-38D, Webster, New York 14580 Cite this: Chem. Rev. 1996, 96, 4, 1…
Ag-coated Au colloidal particles have been prepared by reduction of Ag + in the presence of preformed Au colloids. The composition of the Au 100- x Ag x particles was varied from x = 0 to 80. SERS spectra of pyridine, p -nitroso- N, N‘ -dimethylaniline ( p -NDMA), and trans -1,2-bis(4-pyridyl)ethylene (BPE) have been…
Here we will present a simplification of the form of one popular shape memory alloy (SMA) constitutive model. This simplification allows a more compact written form and hence easier calculations with the one-dimensional SMA constitutive law first developed by Tanaka, later modified by Liang and Rogers, and again by Br…
Using a sol-gel method we have prepared monodispersive particles of La0.67Ca0.33MnO3 in the range from 20 to 110 nm at temperatures from 540 to 1000 °C. A magnetoresistance above 10% was obtained in a field of 1 kOe for all the particles sizes. These results may be relevant for future applications.
We have discovered a superfamily of enzymes related by their ability to catalyze the abstraction of the alpha-proton of a carboxylic acid to form an enolic intermediate. Although each reaction catalyzed by these enzymes is initiated by this common step, their overall reactions (including racemization, beta-elimination…
The effect of finite size on the solidification of o- terphenyl and benzyl alcohol confined in model controlled pore glass (CPG) materials is described. These two organic liquids form either amorphous glasses or crystalline solids in the bulk upon cooling, depending on the rate of cooling and other factors. The solidi…