Tetrathiafulvalene as a catalyst for radical–polar crossover reactions
Tetrathiafulvalene behaves as a catalyst in mediating reaction cycles which feature electron transfer reactions, radical cyclisations and nucleophilic displacements.
Materials Literature
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Observation of blue phases in chiral networks
We report the first observation of cholesteric blue phases in chiral anisotropic polymer networks. In two-component mixtures of a chiral and a non-chiral diacrylate, we observed typical textures of BPI, BPII and BPIII phases. By photopolymerization of these materials at constant temperature we obtained blue phase netw…
Copper by XPS
High energy resolution spectra of high purity Cu foil that was scraped in situ are presented. The experimental width (16%–84% measurement) of the Fermi level of nickel obtained under identical experimental conditions was 0.32 ± 0.02 eV. The binding energy scale calibration is based on the position of the Au 4f7/2 line…
Crevice corrosion: review of mechanisms, modelling, and mitigation
Crevice corrosion is a form of localised attack that most often occurs in narrow fissures where oxygen access is poor and a stagnant electrolyte solution is present. It can result in the destruction of the integrity of metal–metal and metal–non-metal junctions such as may exist at bolted and locktight joints, flanges,…
Surface modification of the biomedical polymer poly(ethylene terephthalate)
X-ray photoelectron spectroscopy was used to characterize modified surfaces of a biomedically important polymer, poly(ethylene terephthalate). Several modification schemes were investigated and direct silanization with 3-aminopropyltriethoxysilane was found to be the optimum procedure, resulting in an aminated surface…
SnO by XPS
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…
Mechanism of the Gelation of Fibroin Solution
Degummed silk was dissolved in a mixture of CaCl2 and ethanol at low temperature. The concentration and pH of the centrifuged, filtered, and dialyzed silk solution were adjusted, and then it was kept in an air-conditioned room for gelation. The mechanism of the gelation and the gel structure were studied. It was found…
Bond-dependent symmetric and antisymmetric superexchange interactions in La 2 CuO 4
The effective spin Hamiltonian that describes the magnetic properties of La${}_{2}$CuO${}_{4}$ is derived from the nearest-neighbor superexchange interactions. It is shown that the spin system of the CuO${}_{2}$ plane of the compound is frustrated; the principal axes of the symmetric parts of the one-bond anisotropy t…
Silicon carbide UV photodiodes
SiC photodiodes were fabricated using 6 H single-crystal wafers. These devices have excellent UV responsivity characteristics and very low dark current even at elevated temperatures. The reproducibility is excellent and the characteristics agree with theoretical calculations for different device designs. The advantage…
Preparation and characterization of Fully stoichiometric SrCoO3 by electrochemical oxidation
Abstract A nearly stoichiometric SrCoO 3 phase had been prepared up to now only using high oxygen pressure. A new method for preparing fully stoichiometric SrCoO 3 has been proposed using electrochemical oxidation. Brownmillerite‐type SrCoO 2.50 is oxidized into a completely stoichiometric perovskite at a potential of…
Ferroelectric Ceramics: Tailoring Properties for Specific Applications
Ferroelectric oxide ceramics are used in a very broad range of functional ceramics and form the materials base for the majority of electronic applications. These electronic applications account for more than 60% of the total high technology ceramics market worldwide (High Technology Ceramic News, 1990). It is the purp…
Subpicosecond 1MLCT .fwdarw. 5T2 intersystem crossing of low-spin polypyridyl ferrous complexes
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):…
Wettability and the evaporation rates of fluids from solid surfaces
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…
SnO2 by XPS
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…
Hydrogen-bonded liquid crystals built from hydrogen-bonding donors and acceptors. Infrared study on the stability of the hydrogen bond between carboxylic acid and pyridyl moieties
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…
Problems and Costs due to Heat Exchanger Fouling in New Zealand Industries
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…
Transport studies for the sorption of copper ions by chitosan
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…
A new hydrosol of gold clusters
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: a general review
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…
Monte Carlo investigations of a Gay—Berne liquid crystal
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…