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。
It is generally agreed in the literature that transesterification leads to or enhances miscibility; that is, transesterification is a necessary condition for miscibility in the polyester blends. We present here, for the first time, indirect and direct experimental evidence to prove that this statement is not completel…
The disproportionation of aqueous hydrogen peroxide catalyzed by sodium tungstate has been investigated with regard to the multiplicity of the oxygen molecules released. Trapping experiments and detection of the IR luminescence of (1)O(2) have shown that the yield of (1)O(2) is virtually quantitative. The mono-, di-,…
The surface chemistry of two new groups of surfactant carboxyporphyrins is described. These materials exhibit well-behaved monomolecular films at an air−water interface. In compressed monolayers, the porphyrin ring appears to be oriented so that the plane of the ring is perpendicular to the surface. The surface-pressu…
Enzyme hydrolysis of zein−wax-coated paper was investigated as part of an effort to develop a recyclable waxed paper product. Brown Kraft paper was coated with corn zein and paraffin wax, and the grease proofing and water vapor barrier properties of the paper were determined. Grease permeation was found to depend on t…
A statistical model has been developed for the prediction of molecular weight and molecular weight distribution in transesterification reactions of diols onto polyesters (ideally polycondensated with a polydispersity of 2). The model was checked out on a transesterification reaction of PEG or diethylene glycol on PLLA…
The ultraviolet (3.8-eV) photolysis of atomically dispersed Rh I (CO) 2 species supported on an Al 2 O 3 surface in the presence of O 2 at 174 K has been studied by transmission infrared spectroscopy (FTIR). Dioxygen is activated on photochemically generated Rh I (CO) sites to produce oxidized rhodium carbonyl species…
The reaction of K(7)[HNb(6)O(19)], H(2)O(2) and A-Na(9)[PW(9)O(34)] in water followed by treatment with Cs(+) or (n-Bu(4)N)(+) (TBA) affords the corresponding salts of the tris(peroxoniobium) heteropolyanion A,beta-[(NbO(2))(3)PW(9)O(37)](6)(-) (1) in approximately 60% isolated yields. An X-ray structure of the Cs sal…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation of Luminescent Silicon Nanoparticles: A Novel Sonochemical ApproachN. Arul Dhas, C. Paul Raj, and A. GedankenView Author Information Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel Cite this: Chem. Mater. 1998, 10, 11, 3278–3281Publica…
Novel structural arrangements for carboxylic acid modified titanium alkoxides were obtained from stoichiometric reactions between titanium isopropoxide (Ti(OPr(i))(4)) and formic acid (HOFc). The 1:1 reaction in toluene forms the tetranuclear species Ti(4)O(2)(OFc)(2)(OPr(i))(10), 1. The structure of 1 was solved in t…
The nickel(II) complex with H 2 saltMe, a N 2 O 2 Schiff base ligand derived from salicylaldehyde, was oxidatively electropolymerized on Pt electrodes in CH 3 CN/0.1 mol dm -3 tetraethylammonium perchlorate (TEAP) to generate polymer films that exhibit reversible oxidative electrochemical behavior in a wide potential…
Tetrametallic molecular rectangles have been synthesized by combining rhenium(I) thiolate dimers with difunctional pyridyl and pyrazyl type ligands. The proposed rectangular structures are supported by 1H NMR, MS, and IR absorption measurements. In addition, crystal structures of two of the rectangles are presented sh…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTransformation of Germanium Dioxide to Microporous Germanate 4-Connected NetsHailian Li and O. M. YaghiView Author Information Department of Chemistry and Biochemistry Arizona State University, Tempe, Arizona 85287-1604 Cite this: J. Am. Chem. Soc. 1998, 120, 40, 10569…
The use of mild hydrothermal methods to synthesize vanadium oxides is reviewed, with particular emphasis on those with layer and 3-dimensional structures. A wide range of studies has been performed predominantly in the past decade to grow new materials that might have interesting electrochemical and magnetic propertie…
Proximity effects of 20 Åthin Fe layers on the spin density waves (SDWs) in epitaxial Cr(001) films are revealed by neutron scattering. Unlike in bulk Cr we observe a SDW with its wave vector Q pointing along only one {100} direction which depends dramatically on the film thickness t_{Cr}. For t_{Cr} < 250 Åthe SDW pr…
The adsorbed amount and the hydrodynamic layer thickness of two series of block copolymers and the corresponding homopolymers on silica were determined. We used diblock copolymers of poly(vinyl methyl ether) and poly(2-ethyl-2-oxazoline) and tri- and diblock copolymers of poly(2-methyl-2-oxazoline) and poly(ethylene o…
A theoretical study of the structural parameters, interaction energies, and bonding mechanism of CO and NO to a Pd center located in two copper-rich bimetallic PdCu(111) surfaces and several coordination positions of the Pd(111) surface is reported. For CO, the bonding nature is predominantly covalent, and the analysi…
Self-consistent field theory is used to investigate the density profile of diblock copolymer melts in a thin film confined between two surfaces, one of which carries a chemically active pattern. The temperature is slowly lowered through the critical point in order to obtain well organized structures. For strong surfac…
We studied the thermodynamics in a single homopolymer chain using a multicanonical Monte Carlo simulation. A polymer chain that exhibits an elongated coil state in a good solvent, or at high temperatures, collapses into a condensed state, i.e., coil–globule transition. For flexible polymer chains, as the temperature d…
Within the framework of a study on the properties of carbon nanotubes, a promising new material, we performed numerical simulation of hydrogen adsorption at room temperature in single-walled nanotubes. The structure of this material is favorable to the adsorption phenomenon because of the narrow size distribution of t…
A surface-controlled electro-optic device using a nematic liquid crystal enclosed between two thin spaced glass plates is presented. Modulation angles of the optic axis up to more than 70° can be achieved even for small applied voltages. The switching of the optic axis occurs with a large component in the plane of the…