Materials Literature
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Epoxidation of oleic acid with oxygen in the presence of benzaldehyde using cobalt(II) tetraphenylporphyrin (Co 2+ -TPP) as catalyst was studied. The results show that high yield of epoxidized oleic acid is obtained by the liquid phase epoxidation of oleic acid in the presence of benzaldehyde using Co 2+ -TPP as catal…
Raman and FTIR reflectance spectroscopies have been used for the characterization of the following zinc corrosion products formed by atmospheric corrosion : (ε-Zn(OH)2, hydrozincite Zn5(CO3)2(OH)6, simonkolleite Zn5Cl2(OH)8,H2O and zinc sulfates ZnSO4,H2O, Zn4SO4(OH)6, 5H2O and Zn4SO4(OH)6,H2O. The samples to analyze…
In this paper is reported the partial hydrophobization of O-(2-sulfoethyl)cellulose (SEC) using 1-bromododecane, 1-bromodecane, and 1-bromododecane with cellulose sulfate (CS), respectively, and characterization of the reaction products by both elemental and spectral analyses. The surface tension, critical micelle con…
Previous temperature programmed desorption (TPD) experiments on reduced TiO2 (001) surfaces have demonstrated that alkynes are converted to the corresponding aromatic products with high selectivity. This reaction also represents the first example of catalytic assembly of carbon–carbon bonds on a metal oxide surface in…
In ${\mathrm{Ce}}_{2}$${\mathrm{Fe}}_{14}$B and ${\mathrm{Ce}}_{2}$${\mathrm{Fe}}_{17}$, cerium is mixed valent and nonmagnetic. Any structural or compositional modification of these intermetallics which induces cerium to become trivalent and develop a local 4f moment should result in compounds with enhanced magnetost…
Ubiquitin is a 76-amino acid protein involved in the targeting for destruction of proteins in the cell. The protein can readily be synthesized chemically affording an extra dimension to studies of protein stability. Ubiquitin with various modifications to the hydrophobic core has been synthesized. In particular, two c…
Representative profiles of the Owena, Egbeda, Alagba, and Balogun series were studied. The Owena soil is formed in amphibolite whereas Egbeda and Balogun soils are formed in biotite gneiss derived parent materials. The Alagba soil is formed in sandstone parent rock. The main objectives were to characterize the soils a…
The adsorption of the hydroxyl (OH) radical on Ni(100), Ni(111), and Fe(110) and coadsorption of OH + O on Ni(100) are treated using an ab initio configuration interaction embedding theory. The metal surfaces are modeled as a 30-atom cluster for Ni(100), a 28-atom cluster for Ni(111), and a 40-atom cluster for Fe(110)…
Experimental solubilities are reported for pyrene dissolved in eight binary mixtures containing 2-methyl-2-butanol and alcohol (1-propanol, 2-propanol, 1-butanol, 2-methyl-1-propanol, 1-pentanol, 2-pentanol, 3-methyl-1-butanol, or 4-methyl-2-pentanol) at 26 °C. Results of these measurements are used to test two mathem…
Cet article fait le point sur l'état actuel des connaissances concernant les résines époxy réticulées par des polyamines, et plus particulièrement sur : - la réticulation ; - la structure et la morphologie des systèmes réticulés et les paramètres qui les influencent; - les relations entre la structure et les propriété…
Three-dimensional scans of residual stress within intact weldments provide insight into the consequences of various welding techniques and stress-relieving procedures. The neutron diffraction method for nondestructive evaluation of residual stresses has been applied to a circumferential weld in a ferritic steel pipe o…
Investigates whether water vapour transfer from the local environment of the human body at a relative humidity less than 100 per cent to a rainy or wind‐driven environment of relative humidity almost 100 per cent is possible. To identify whether prolonged rain has an effect on water vapour transfer in waterproof breat…
Abstract As a new tetrathiafulvalene (TTF)-based donor molecule were synthesized spiro carbon and germanium compounds substituted with two tetrathiafulvalenyldithiolate groups. The redox processes were composed of two pairs of broad and reversible waves, each of which involves two electron transfer. The radical cation…
A systematic modeling analysis for polyaddition of isophorone diisocyanate to poly(oxyethylene) glycol, poly(oxypropylene) glycol, and poly(oxytetramethylene) glycol (PEG−PPG−PTMG) ternary polyol-based waterborne polyurethane (PU) synthesized by a modified acetone process was performed. Using a mixture of experimental…
The thermal diffusivity of bulk ${\mathrm{Ge}}_{\mathrm{x}}$${\mathrm{As}}_{40\mathrm{\ensuremath{-}}\mathrm{x}}$Se(S${)}_{60}$ glasses has been measured by an optical beam deflection method as a function of the composition. The dependence of the thermal diffusivity of both the families on the average coordination num…
The phase behavior of dimerizing (associating) rigid particles is studied by both theory and computer simulation. The model molecule comprises a hard spherocylinder of length L and diameter D with a terminal square well bonding site embedded in one of the hemispherical caps. This model mimics the properties of simple…
We report the generation of fullerenes and nanotubes using an arc discharge on graphite in a high-pressure nozzle. The vapour from the arc is quenched via collisions with helium gas, forming carbon clusters within a localized highpressure region. The carbon molecules are entrained in the gas jet as it expands into the…
Silicon carbide (SiC) whiskers were formed by microwave and conventional heating in the present study. SiC whiskers with diameters in the nanometer range were synthesized by reducing silica (SiO 2 ) with various forms of carbon in a microwave furnace. Ultrafine SiO 2 powder, char, phenolformaldehyde resin, and carbon…
The strong prolate anisotropy of the backbone conformation observed in the nematic phase of ‘side-on fixed’ LCP is found to be as great as for main chain LCP. From this remark originated this SANS study of a ‘jacketed’ polymer PA4,4,4. A form factor of cylinders is used to model the experimental scattering data as in…
Introduction and synopsis Foams have unique thermal, electrical and acoustic properties. Among these are: exceptionally low thermal conductivity, making them a prime choice for thermal insulation; very low dielectric loss, allowing transmission of microwaves without attenuation or scattering; and the ability to absorb…