Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubpicosecond 1MLCT .fwdarw. 5T2 intersystem crossing of low-spin polypyridyl ferrous complexesJames K. McCusker, Kevin N. Walda, Robert C. Dunn, John D. Simon, Douglas Magde, and David N. HendricksonCite this: J. Am. Chem. Soc. 1993, 115, 1, 298–307Publication Date (Print):…
The interfacial forces which determine the interaction between a fluid and a solid surface have been investigated under dynamic conditions. The evaporation characteristics of fluid drops placed on solid surfaces have also been investigated. The rate of evaporation of drops of liquids placed on smooth solid surfaces wi…
Tin and various tin compounds have wide utility in coatings, electronics, and catalysts, as well as having numerous biological applications. Distinguishing between different tin compounds on surfaces is an important aspect of research in many of these disciplines. In this work, x-ray photoelectron spectroscopy has bee…
The stability of a hydrogen-bonded complex built through inter-molecular hydrogen bonding between carboxylic acid and pyridine fragments has been examined using infrared spectroscopy. Infrared spectra as a function of temperature have been recorded for the 1:1 complex of 4-hexyloxybenzoic acid and trans-4-propoxy-4′-s…
Data are reported on the perception of fouling in New Zealand based on 200 companies and the application of nearly 2000 heat exchangers. These data are discussed with respect to their occurrence for various heat exchanger applications, industries, and heat exchanger types. The fouling mitigation strategies applied in…
The ability of chitosan, prepared from waste prawn shell, to sorb copper (II) ions from aqueous solutions has been studied. Equilibrium studies show that chitosan has a maximum sorption capacity for copper ions of about 40mg/g chitosan. The mass transport characteristics have been investigated by monitoring the kineti…
Reduction of gold(III) ions by tetrakis(hydroxymethyl)phosphonium chloride gives a hydrosol of gold clusters with mean diameter 1.5 nm (average nuclearity about Au170) and smaller.
Ethylene-vinyl acetate (EVA) copolymers are used extensively in the wire and cable industry for making heat shrinkable insulation, semi-conductive insulation jackets, and flame retardant insulation. A general review of EVA copolymers is given. The following items are reviewed: EVA copolymer development, methods of man…
We report extensive Monte Carlo simulations of two systems with 512 and 1000 particles interacting with a Gay–Berne potential with strength parameters (µ= 1, ν= 3) that enhance the side-by-side and end-to-end interactions between the particles. We show that the system has a smectic, nematic and isotropic phase and we…
The optical changes that occur upon the addition of iodide, iodine, and colloidal silver iodide to a colloidal solution of silver particles 6 nm mean diameter were monitored spectrophotometrically. For small concentrations of added I and I2 formation of less than a monolayer of adsorbate , the changes in the shape of…
Structural, electrical, and optical properties of the polycrystalline films of VO<sub>2</sub>, V<sub>2</sub>O<sub>5</sub>, and mixtures of these two oxides are presented. Resistivity change by a factor larger than 10<sup>3</sup> accompanying the semiconductor-metal phase transition in the VO<sub>2</sub> films is repor…
The diffusion of small molecules in polymers was measured using Fourier transform infra-red-attenuated total reflection (FTi.r.-a.t.r) spectroscopy, a new approach which allows one to study liquid diffusion in thin polymer films in situ. The system used to test this technique was the diffusion of liquid water in polya…
Die Tonminerale heben sich durch eine Vielfalt von Reaktionen von allen anderen Mineralen und anorganischen Feststoffen abo Als wichtigste Bestandteile der Tone verleihen sie diesen die besonderen Eigenschaften, die die Menschen in ihren frfiheren Kulturen als Bau-und Gefrulmaterial auszunutzen wuBten. Heute haben die…
Refluxing mixed solutions of palladium(II) chloride and hexachloroplatinic(IV) acid in ethanol–water (1 : 1, v/v) in the presence of poly(N-vinyl-2-pyrrolidone) results in well dispersed and stable colloidal dispersions of polymer-protected palladium/platinum bimetallic clusters. The UV–VIS absorption spectra and tran…
For a long time, classification of partial discharges was performed by eye, by studying discharge patterns at the ellipse of an oscilloscope screen. The introduction of digital processing techniques allowed automation of the recognition procedure. These procedures are reported and applied to a number of actual HV cons…
Reviews surface flashover of insulator, primarily in vacuum, although some comments are made about the effect of ambient gases on surface flashover. It presents theoretical mechanisms of surface flashover and pertinent experimental results. The holdoff voltage of insulators depends upon many insulator parameters, such…
All articles of this category 4,5-Dichloro-1,2-dicyanobenzene (5) was prepared in an overall yield of 49% from 4,5-dichloro-1,2-benzenedicarboxylic acid (1) . The reactions of 5 with phenols, thiophenol and 1-propanethiol led in a nucleophilic displacement reaction to the 4,5-bis(aryloxy)-,4, 5-bis(phenylthio)-and 4,5…
The study of metallic melts, their physical properties, and their solidification behaviour is of relevance to understanding of fundamental principles and to metallurgical applications. Many, if not most, of these properties are extremely sensitive to contamination of the melt by impurities. Consequently, containerless…
Appropriate surface modification has significantly improved the blood compatibility of polymeric biomaterials. This article reviews methods of surface modification with water-soluble polymers, such as polyethylene oxide (PEO), albumin, and heparin. PEO is a synthetic, neutral, water-soluble polymer, while albumin and…
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