Materials Literature
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Abstract Minimum necessary adaptations are described that are sufficient for obtaining very low energy electron micrographs (VLEEMs) from commercially available routine scanning electron micrographs (SEMs) with the electrons accelerated to an energy of the order of tens of keV. A cathode lens inserted into the specime…
Infrared spectroscopy is used to characterize the hydroxyls of HEMT and the interactions with benzene of these hydroxyls and of Na+ cations in NaEMT. Benzene adsorption studies reveal that HEMT is a stronger solid acid than HY or HSAPO-37 and that ca. 55–65% of the theoretical protons are still present after evacuatio…
Tetra-tert-butylphthalocyaninatonickel is synthesized from phthalic anhydride as well as from phthalodinitrile and nickel chloride, whereby a mixture of four different structural isomers are obtained; two of these isomers, with C2v-and Cs-symmetry are isolated for the first time by HPLC and medium pressure liquid chro…
A short and efficient synthesis of N, N, N′, N′-[2,6-bis(3-aminomethyl-1-pyrazolyl)pyridine]-tetrakis(acetic acid)(6), an analogue of terpyridine with additional chelating iminodiacetic groups, is described. Compound 6 forms stable complexes with EuIII and TbIII in water whose relative luminescence yields, excitation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIon exchange of amino acids and dipeptides on cation resins with varying degree of crosslinking. 1. EquilibriumIda L. Jones and Giorgio CartaCite this: Ind. Eng. Chem. Res. 1993, 32, 1, 107–117Publication Date (Print):January 1, 1993Publication History Published online1 May…
A detailed study of the parameters and phases involved in the pre-crystallization of the hydrothermal conversion of coal fly ash to zeolites has been performed. The study has also been extended to pumice, a natural glassy aluminosilicate.Dissolution of the main components, their concentration ratio in the solution pha…
Research Article| July 01, 1993 Role of organic matter in the Proterozoic Oklo natural fission reactors, Gabon, Africa Bartholomew Nagy; Bartholomew Nagy 1Laboratory of Organic Geochemistry, Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Sch…
The influence of dipolar forces on the structural and thermodynamic properties of hard spherocylinders is investigated in the isotropic and smectic phases using Monte Carlo simulations. Irrespective of the characteristics of the dipole moment, location (from center to the end of the molecule), strength (${\mathrm{\ens…
The coalescence rate of liquid droplets in a protein-stabilized emulsion containing water-soluble non-ionic surfactant has been studied in turbulent shear flow by monitoring the change in average droplet size with shearing time. The pronounced effect on orthokinetic stability of small surfactant additions may be attri…
Abstract WAXD, SAXS, FTIR, DSC and density techniques have been used to investigate the crystal structure, crystal density ρ c , amorphous density p a equilibrium heat of fusion δ H ° m and equilibrium melting temperature T ° m . By extrapolating the straight lines in the FTIR absorbance against density plot to zero i…
A systematic method of growing rod-like β-Si3N4 single crystals from a melt flux has been developed. β-Si3N4 particles with a diameter of 1-2μm, a length of 10-20μm and a low density of defects were obtained by heating a mixture of α-Si3N4, Y2O3 and SiO2. The residual glassy phase was removed by subsequent acid treatm…
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Infrared spectra of aluminium carbonyl complexes generated in argon matrices by co-condensation of aluminium atoms and carbon monoxide have been observed and analysed. AlCO, aluminium monocarbonyl, was isolated and clearly identified. It is characterized by a carbonyl force constant (Fco≈ 14 mdyn Å–1) markedly smaller…
We report on the reaction of SO 2 and NO 2 in sub‐ppm concentrations in humid air with a copper surface. The deposition of SO 2 was studied in a time‐resolved manner and the formation of HNO 2 was measured. Corrosion products were analyzed using XRD, FTIR, FTIRAS, and ion chromatography. S IV ‐O species on the copper…
The dependence of mesomorphism of 1,3-diketonate vanadium-oxo (vanadyl) complexes on the number of side chains was investigated. These complexes have a large dipole normal to the disc plane and are under investigation in an effort to generate discotic phases with polar order. Relatively complex phase behaviour is obse…
The extent of the surface crosslinking of high-density polyethylene (HDPE) under various plasma treatment conditions was investigated. The plasma modification efficiency was studied by surface energy and adhesive bond strength measurements. The results show that the surface crosslinking of HDPE takes place as soon as…
A variety of characterization methods based on X-ray scattering may be used to sensitively probe the structure of polymer surfaces and interfaces. Among these are small angle scattering in transmission, specular reflectivity, grazing incidence off-specular scattering, and grazing incidence diffraction. X-ray measureme…
The development of membrane systems that are adaptive-whose physical and/or chemical properties can be manipulated after synthesis—expands the applicability of membrane technology. In this work, we have employed both polyaniline and polypyrrole based membranes to demonstrate how transport of ionic species can be regul…
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