Materials Literature
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Raman spectra have been obtained from a series of Pt/Al2O3 catalysts containing from 0 to 20% CeO2, and a Pt/CeO2 catalyst, prepared by sol–gel processing. Spectra were recorded following calcination of the catalyst precursors at various temperatures up to 600 °C and compared with thermogravimetric data. The results c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrafted polymer brushes: a constant surface pressure molecular dynamics simulationGary S. GrestCite this: Macromolecules 1994, 27, 2, 418–426Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs…
The chemical sol-gel route is used to prepare undoped and substituted barium and strontium ferrites. Beside standard crystallographic and magnetic measurements, ferromagnetic resonance experiments are used to analyze the formation of the hexaferrite phase and to determine the anisotropy field strength. Specific satura…
Although vibronic Jahn-Teller interactions almost always cause both 4- and 6-coordinate copper(II) complexes to distort significantly away from regular tetrahedral and octahedral geometries, rather different factors influence the size and nature of the distortions. In the former case, the active mode is a bending vibr…
The synthesis of layered lithium aluminium hydrotalcite-like materials is described along with different anion exchange procedures for the preparation of materials intercalated with chloride, nitrate and vanadate. The products have been characterised using elemental chemical analysis, powder X-ray diffraction, Fourier…
Three spiro[indoline-naphthoxazines] and a spiro[indoline-phenanthroxazine], which exhibit photochromic and thermochromic properties, have been investigated. Solvent and structure effects on the absorption spectra of the merocyanines produced under UV irradiation and kinetic parameters for the ring-closure and ring-op…
Metallic materials are used extensively as orthopedic implants, dental materials, sensing elements of bioelectrodes, and other applications. The electrochemical behavior of these biomaterials is of interest for a variety of reasons. The corrosion resistance of an implant material influences its functional performance…
B-site disordered Pb(Sc½Ta½)O3 and Pb(Sc½Nb½)O3 can be prepared in a controlled manner to show (a) relaxor behavior and (b) relaxor that undergoes a first order ferroelectric phase transition at zero-bias field. The latter case is a first demonstration of a spontaneous transformation from relaxor to ferroelectric stat…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
Thethermoelectric properties of mixed oxides In2O3·MOx(MOx= Cr2O3, Mn2O3, NiO, ZnO, Y2O3, Nb2O5 SnO2) are investigated in terms of the thermoelectric materials at high temperature. The Seebeck coefficients,S, of all the samples have negative values, and those of In2O3·SnO2 and In2O3·ZnO increase linearly with temperat…
The syntheses and characterization of a series of (15-crown-5)methyl 3,4,5-tris(p-alkyloxybenzyloxy)benzoatest with alkyl tails of four 25, six 26, and twelve 27 carbon atoms and of (15-crown-5)methyl 3,4,5-tris(p-dodecyloxybenzoate)28 are described. Complexation of the crown ether endo-receptor with NaCF3SO3 destabil…
The mechanism of irreversible inactivation of mandelate racemase (MR) from Pseudomonas putida by alpha-phenylglycidate (alpha PGA) has been investigated stereochemically and crystallographically. The (R) and (S) enantiomers of alpha PGA were synthesized in high enantiomeric excess (81% ee and 83% ee, respectively) usi…
ZnO and ZnS powders were prepared from aqueous solutions of zinc salts in the presence of ethylenediamine or triethanolamine. The morphology of the powders was analysed by scanning electron microscopy and infrared spectroscopy. The effect of the experimental conditions upon the size and shape of the particles is descr…
Advanced liposomal therapeutics has been attained by liposome surface modification, initially with specific glycolipids and subsequently with surface-grafted PEG, reducing in vivo rapid recognition and uptake, giving prolonged blood circulation, and providing selective localization in tumors and other pathological sit…
Several mechanism-related aspects of the corrosion of zirconium alloys have been investigated using different examination techniques. The microstructure of different types of oxide layers was analyzed by transmission electron microscopy (TEM). Uniform oxide mainly consists of m-ZrO2 and a smaller fraction of t-ZrO2 wi…
It is shown that the adsorption of water by a variety of active carbons can be described within the framework of Dubinin's theory. Owing to the low values of the characteristic energy, E(0.8–2.5 kJ mol–1), the Dubinin–Astakhov equation becomes S-shaped in the range 0.3 < p/po <0.7 and provides a good basis for the fit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImportance of distinct water environments in the hydrolysis of poly(DL-lactide-co-glycolide)Eric A. Schmitt, D. R. Flanagan, and Robert J. LinhardtCite this: Macromolecules 1994, 27, 3, 743–748Publication Date (Print):January 1, 1994Publication History Published online1 May…
An extension of the Judd–Ofelt technique [B. R. Judd, Phys. Rev. 127, 750 (1962)] is introduced in which measured fluorescence branching ratios are incorporated into the calculation of the Judd–Ofelt parameters. It is found that including branching ratio measurements into the analysis allows the Judd–Ofelt parameters…
Calcium carbonate precipitation by 63 strains of moderately halophilic bacteria (Vibrio spp.) isolated from water of a saltern pond has been studied, taking into account the influence of salinity and temperature on the quantity and type of crystals precipitated. The bacteria formed crystals under all the conditions te…
Novel bis(phthalocyaninato)lutetium(III) complexes substituted with long n-alkyl chains have been synthesized. These complexes, 1a–c, show three kinds of discotic mesophase (Dhd, Dob.d, and DL). Also 1a–c display the three primary colours (red, green, blue) of electrochromism in their solutions. The solutions of oxidi…