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。
29 Si NMR is used to quantify the polymerization kinetics of silicon alkoxide intermediates in acidic sol−gel processes well before gelation. Reaction conditions are chosen (a) to minimize interference by hydrolysis kinetics and differing degrees of hydrolysis and (b) to investigate the possibility of single-step copo…
Surfaces of medical grade silicone rubber (Q7-4750, Dow Corning) were modified by repeated (six times) RF plasma treatments using various discharge gases: oxygen, argon, carbon dioxide, and ammonia. The treated samples were stored for a period of 3 months in ambient air, water, or liquid nitrogen. Subsequently, the te…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEfficient Photochemical Oxygenation of Cyclohexene with Water as an Oxygen Donor Sensitized by Dimethoxy-Coordinated Tetraphenylporphyrinatoantimony(V)Tsutomu Shiragami, Kyouichi Kubomura, Daisuke Ishibashi, and Haruo InoueView Author Information Department of Industri…
The title compound [NEt4]3[WOS3(CuI)3(µ2-I)]· H2O has been synthesized by the reaction of (NH4)2WO2S2, CuI and Et4NI. Single-crystal X-ray diffraction data show that the anionic cluster [WOS3(CuI)3(µ2-I)]3– has a half-open cage structure. Non-linear optical (NLO) properties of the cluster were investigated with a puls…
The specific epithet of Halobacterium salinarium is a grammatically incorrect form for the genitive of salinae (salt works). Therefore, we propose that the name of the type species of the genus Halobacterium should be changed to Halobacterium salinarum nom. corrig. This species includes strains often designated Haloba…
The rheology and microstructure of aqueous dispersions containing Mg–Al layered double hydroxides (LDHs) are considered. The thickening and gelling of such dispersions can be controlled by the addition of electrolyte or, within a certain composition range, by the application of shear. In addition to electrolyte and LD…
A new series of bis-macrocyclic bola-amphiphiles were prepared, and their transport activities in vesicle and planar bilayer membranes were evaluated. From vesicle experiments, the apparent kinetic order in transporter indicates that aggregates are the kinetically active species. Step-conductance changes observed in p…
Differential thermal analysis is used to examine the kinetics of nucleation associated with the melt phase crystallization of n -alkanes in the homologous series C 13 H 28 to C 32 H 66 . Crystallization studies from stagnant melt samples reveal a direct correlation between structural type and nucleation behavior, nota…
A thermotropic dialkoxy biphenyl liquid crystal, functionalized by a carboxylic acid group at one extremity, is mixed to varying proportions with poly(4-vinylpyridine) (P4VP). The liquid crystal, LC-4,6A, is characterized by a monotropic smectic A phase and a highly ordered or crystalline lamellar phase formed primari…
A novel soluble tetranuclear copper(I) cluster containing an unsubstituted μ 4 -selenido moiety, [Cu 4 (μ-dppm) 4 (μ 4 -Se)] 2+ ( 1 ), has been synthesized and characterized by X-ray crystallography. Its photophysical and electrochemical properties have been studied. It is envisaged that the emissions of 1 are associa…
Silole–pyrrole co-oligomers (containing up to nine rings) are synthesized and found to have long UV–VIS absorption maxima in spite of their twisted structures.
Heat capacity spectroscopy measurements in the frequency range from 1.25 to 12 600 rad/s at the dynamic glass transition in poly(vinyl acetate) are reported. The data are compared to results of dielectric and shear spectroscopy in a comparable frequency range on the same sample. The peaks of the different imaginary pa…
It is shown that is an excellent host lattice to obtain efficient VUV excited photoluminescent materials at room temperature. The introduction of ions in the lanthanum metaborate host lattice increases both the ionicity of the metal‐ligand bonding and the energy transfer rate between the host and the activator.
1,3,5-Tris(1-naphthyl)benzene ( 1 ), 1,3-bis(1-naphthyl)-5-(2-naphthyl)benzene ( 2 ), and 1-(1-naphthyl)-3,5-bis(2-naphthyl)benzene ( 3 ) easily supercool and form glasses on cooling from the melt. We synthesized 1, 2, and 3 using Suzuki's conditions to effect the cross-coupling reactions of 1,3,5-tribromobenzene with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of B, BH, BH2, and BmHn Species: Thermochemistry and KineticsS. H. BauerView Author Information Cornell University, Department of Chemistry, Baker Laboratory, Ithaca, New York 14853-1301 Cite this: Chem. Rev. 1996, 96, 6, 1907–1916Publication Date (Web):October 1,…
Abstract
A novel approach has been proposed to describe the relationship between the conductivity and relative density of highly porous materials. As a first approximation, porous material was represented by a uniaxial string of spheres along the direction of the potential gradient. Then, a string of spheres was remodeled into…
A realistic model of transport properties of zinc oxide varistors is constructed from two-dimensional Voronoi networks and studied via computer simulations. In agreement with experimental microcontact measurements made on individual junctions, the networks are assumed to contain randomly distributed microjunctions of…
This paper presents a novel class of nonlinear optical (NLO) polymer for second harmonic generation (SHG). This new class of NLO polymer consists of the linear polyurethane, T-polymer, of tolylene 2,4-diisocyanate (TDI) with 3-[(2-hydroxyethyl)amino]-5-(hydroxymethyl)-4‘-nitroazobenzene (T-AZODIOL), whose dipole momen…
Methyl cellulose has been used as a stabilizer in the oxidative dispersion polymerization of aniline using ammonium persulfate oxidant. The dispersion polymerization is unsuccessful in water but successfully effected in aqueous alcohol media. Evidence has been presented that the stabilizer incorporation in polyaniline…