Materials Literature
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Fluxes of trivalent lanthanide ions across cellulose triacetate membranes were determined by using hinokitiol (HIPT) and flavonol (HFL) as carriers. The transport of the lanthanides was coupled to a flow of hydrogen ions. The effects of added anion and the pH in the source phase, and the plasticizer incorporated in th…
Chemical deposition of PbS from aqueous solutions has been studied using a reaction of PbS ( NO 3 ) 2 and CS ( NH 2 ) 2 with excess NaOH . The growth rate was measured as a function of temperature and concentrations of NaOH and CS ( NH 2 ) 2 using glass substrates. It is found that the incubation time depends on tempe…
Abstract 71 Ga and 27 Al NMR and clay mineral pillaring studies were used to investigate the hydrolysis of Al(H 2 O) –Ga(H 2 O) solutions, mixed in an Al:Ga mole ratio of 12:1, and confirmed the formation of the previously proposed GaO 4 Al 12 (OH) 24 (H 2 O) polyoxycation. This species has been found to be formed in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and properties of a trinuclear and a mononuclear nickel(II) complex of N,N'-dimethyl-N,N'-bis(.beta.-mercaptoethyl)ethylenediamineMary A. Turner, Willem L. Driessen, and Jan ReedijkCite this: Inorg. Chem. 1990, 29, 18, 3331–3335Publication Date (Print):…
Manganese introduced in BaTiO3 as a substituant of titanium is able to trap the electrons produced during a sintering under a very low oxygen pressure. However it strongly modifies the vibrational and electronic properties of the pure compound. This paper is a short summary of the experimental results obtained by impe…
Raman spectroscopy has been used to monitor the changes induced in glassy carbon as a result of irradiation with H, He, C, N, Si, and Xe ions. The Raman spectrum of unirradiated glassy carbon consists of an intrinsic graphite peak at 1590 cm−1 (the a peak) and a disorder-induced D peak at 1350 cm−1. The G peak positio…
The hygroscopicity of theophylline anhydrate has been investigated by gas adsorption and hydration kinetic methods. Type 1 theophylline anhydrate was obtained by recystallization from distilled water at 95 degrees C, and type II was obtained by dehydration of theophylline monohydrate. The X-ray diffraction pattern of…
A new wet process was developed for preparing a V 2 O 5 thin film for use in an electrochromic display device. V 2 O 5 powder was dissolved into a mixed solution of benzyl alcohol and iso-butanol to obtain a vanadium solution, which was then spin-coated on an ITO glass followed by a heat treatment at temperatures abov…
The pressure-temperature phase diagram of the quasi-one-dimensional molecular superconductor TTF [Ni(dmit${)}_{2}$${]}_{2}$ has been carefully determined by ac resistivity measurements up to 14 kbar. Increasing pressures induce electronic phase transitions between a high-temperature metal and successive, metallic or s…
Films of copper oxide were readily deposited electrochemically on conductive surfaces from alkaline solutions containing copper (I, II) cyanide. The resulting electrodes showed catalytic activity for the anodic oxidation of CN − to CNO − in alkaline media. The half‐wave potential was p H dependent, indicating the invo…
Abstract The high‐temperature dispersions occurring in some poly (styrene‐co‐alkali methacrylate) ionomers are investigated by dynamic mechanical thermal analysis as a function of ion content. The heights and areas of the loss modulus peaks associated with these dispersions suggest that the ionic “cluster” phase becom…
The special dependence of gain saturation and the effect of inhomogeneous broadening are investigated in erbium-doped aluminosilicate fiber amplifiers. Experimental data are compared with calculated results using two theoretical models, one assuming completely homogeneous saturation and the other including inhomogeneo…
The application of Raman spectroscopy for the investigation of phase transitions focused traditionally on the observation of soft modes in displacive systems. The present furthergoing study on displacive and order-disorder systems is based on the observation of systematic changes of the scattering profiles of hard mod…
A volumetric 10:1 ratio of citric acid (50% by weight) and hydrogen peroxide (30%) is shown to be a better selective etchant of GaAs/Al0.30Ga0.70As systems than the more commonly used ammonium-hydroxide/hydrogen peroxide solutions in terms of the selectivity of the etching rate, the smoothness of the etched surface, a…
The current model for hepatic 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase divides the protein into two functional domains: an N-terminal kinase domain and a carboxyl-terminal bisphosphatase domain. Site-directed mutagenesis was used to evaluate the role of two putative bisphosphatase active site histidyl resi…
Several important aspects of the vapor deposition of diamond thin films by hot filament associated chemical vapor deposition (CVD) are described. This deposition technique is economical and scalable to large areas. However, practical difficulties such as deformation of the filament and its relatively short lifetime of…
Threo-Ds-3-isopropylmalate dehydrogenase coded by the leuB gene from an extreme thermophile, Thermus thermophilus strain HB8, was expressed in Escherichia coli carrying a recombinant plasmid. The thermostable enzyme thus produced was extracted from the E. coli cells, purified, and crystallized. The enzyme was shown to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared study of syngas adsorption on zirconiaEugenio GuglielminottiCite this: Langmuir 1990, 6, 9, 1455–1460Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September 1990https://pubs.acs.org/doi/10.1021/la00099a00…
The isotropic phase of nematogenic substances above the nematic–isotropic phase transition temperature Tni is characterized by short range orientational correlation of the molecules and the existence of pseudonematic domains. This microscopic structure has a strong influence on reorientational dynamics in the liquid.…
Abstract The morphology and impact properties of polystyrene‐maleic anhydride/bromobutyl rubber blends have been studied as a function of interfacial modification and melt processing conditions. It is found that dimethylaminoethanol (DMAE) serves as a reactive compatibilizing agent for these blends and that the additi…