Materials Literature
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The catalytic behaviour of H5PV2Mo10O40 heteropoly acid in the oxidation of n-butane to maleic anhydride is analysed in relation to that of its partially salified Cs salt and their FTIR spectra, UV–VIS diffuse reflectance spectra, thermogravimetry and reducibility tests as well as solid state 51V NMR and EPR character…
The development of the various partial-discharge test methods as applied to cables, capacitors transformers, and rotating machines is examined in an historical context. Special emphasis is placed on various discharge pulse analysis techniques, although it is pointed out that integrated charge measurements should recei…
A graphite/polymer composite material was directly coupled with: 2014 aluminum (bare and hard-anodized), pure grade titanium, 316 stainless steel and monel. Samples were then immersed in natural seawater. The titanium couple was inactive. Stain less steel and monel changed behavior from noncorroding to crevice and pit…
Iron porphyrins that are modified on both faces by chiral binaphthalenes catalysed asymmetric oxidation of sulphides in fair to good enantiomeric excesses and excellent turnover numbers of the catalysts in the presence of 1-methylimidazole.
Abstract Polyurethane (PU) films were prepared by solution casting using a three‐component system consisting of a low molecular weight fraction of softwood kraft lignin (KL), polyethylene glycol (PEG) of various molecular weights, and crude diphenylmethane diisocyanate (MDI) as starting materials. All films were prepa…
Abstract Clay minerals provide information on the burial and thermal history of sedimentary rocks that is useful in the exploration, evaluation, and production of hydrocarbons. In particular, changes in clay minerals may be used as geothermometers that record temperatures corresponding to various stages of hydrocarbon…
The structure of the passive film that protects iron and iron/chromium alloys from corrosion has been investigated in situ in an aqueous environment using X-ray absorption spectroscopy, with fluorescence yield detection. From an analysis of the EXAFS and XANES it has been shown that the film formed on iron consists of…
We have studied the behavior of a cholesteric liquid crystal sandwiched between two plates, with homeotropic anchoring, in the presence of an electric field. By changing two control parameters, namely the sample thickness and the electric field magnitude, we were able to characterize different types of solutions : a n…
Poly (L-lactic acid) microcapsules were prepared using an emulsification and organic solvent evaporation technique (w/o system) with phenobarbitone as a reference core. Three polymers of different molecular weight (61,300; 43,200, 2400), were used to prepare different core loaded microcapsules. Microcapsule size incre…
The food industry is interested in polyelectrolytic coagulants of natural origin for the clarification of food beverages and the recovery of colloidal and dispersed particles from processing waste streams. This paper discusses potential industrial applications of recent findings on polymer complex formation obtained w…
Abstract The structure of rigid-chain polyesters and polyamides which possess flexible side chains consisting of methylene or 1,4,7-trioxaoctyl oxide units have been investigated by means of X-ray scattering. The X-ray studies were performed on fibres and monodomains. Additional information was gained from calorimetri…
Unusual regioselectivity towards internal allylic double bonds in preference to terminal allylic double bonds is displayed using the newly synthesized vanadium-pillared montmorillonite catalyst.
Abstract Phase behavior of blends of bisphenol A polycarbonate (PC) with polystyrene (PS), poly(styrene‐co‐acrylonitrile) (SAN), poly(acrylonitrile‐butadiene‐styrene) (ABS), poly(methyl methacrylate) (PMMA), poly(ethylene terephthalate) (PET), and poly(butylene terephthalate) (PBT) has been investigated. Blends were p…
Part 1 Introduction to basic concepts of LPE: epitaxy phase equilibria choice of LPE growth temperature basic LPE growth processes impurity segregation advantages and disadvantages of LPE as a growth technique for device materials. Part 2 Short summary of LPE apparatus and techniques: LPE growth systems and boat desig…
Techniques that can be used to provide corrosion-resistant layers for NdFeB magnets are discussed along with methods of assessing the long-term reliability of coatings. Tests show good results with IVD (ion-vapor-deposited) aluminum and cathodic electropaint deposited coatings, with significantly less corrosion protec…
In the CANDU nuclear reactor, pressure tubes made from Zr-2·5 Nb contain the fuel and the heat-transport heavy water. At each end, the tube is connected to a stainless steel end fitting by a rolled joint. A thin Zircaloy tube surrounds the pressure tube and the annular space between the tubes contains an inert gas. If…
Rhombohedral calcite crystals grown from supersaturated solutions undergo an unusual and specific morphological change in the presence of Li; the doped crystals are structurally invariant but exhibit well-developed basal (001) faces indicating that these relatively high energy crystal surfaces are stabilised by the in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and thermal properties of new liquid crystals bearing a crown ether ring: cation binding in the nematic phaseGong Xin He, Fumio Wada, Kiyoshi Kikukawa, Seiji Shinkai, and Tsutomu MatsudaCite this: J. Org. Chem. 1990, 55, 2, 541–548Publication Date (Print):January 1…
Abstract
Joining technologies of ceramics to metals have been advanced in recent few years. There have a lot of difficult problems to be overcome in developing joining techniques. To control the chemistry of interfaces is, of course, one of the big key points. The active metal brazing has been established for solving this prob…