Materials Literature
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The complexes of general formula [Ni(L)(N3)][ClO4](L is meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane or 2,3-dimethyl-1,4,8,11-tetraazacyclotetradeca-1,3-diene), have been characterized by X-ray crystallography; both are chains in which the nickel(II)–tetraammine fragment is bridged by one µ-azido l…
Tetra-p-aminophenylporphyrin (TPP) was conjugated with gadolinium diethylenetriaminepentaacetic acid (DTPA) and used as a contrast agent in magnetic resonance (MR) imaging to achieve tumor selectivity in nude mice. A substantial decrease in T1 was measured in excised tissues (kidneys, tumor, and liver) from mice that…
Many liquid crystals are found to have relatively high birefringence (Δn) values in the microwave and millimeter wave regions, as calculated from the phase shift induced by their reorientation by magnetic or electric fields. At 30 GHz, Δn values were obtained in the range of 0.08 to 0.18 for eleven liquid crystal mixt…
We report measurements of the temperature variation of the flexoelectric coefficient (e 1–e 3) of a number of nematic liquid crystals like phenylcyclohexanes, cyanobiphenyls, etc. We have also measured (e 1+e 3) of a few systems using appropriate methods of applying an electric field gradient to the sample. In most of…
This paper reviews liquid crystal optical devices including tunable filters, photonic switches and spatial light modulators, and examines their application to optical communication and information processing systems. Optical processing has three major advantages: massive parallelism, high speed and broad wavebands. Co…
In an effort to develop direct detection methods for Perkinsus marinus cells in host tissue and environmental samples, the production of both mono-and polyclonal antibodies specific for this apicomplexan oyster pathogen was attempted. A particulate hypnospore immunogen was isolated from infected oyster hemolymph follo…
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…
Abstract
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…