Materials Literature
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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…
The new tripodal ligand tris-[3-(2′-pyridyl)pyrazol-1-yl]hydroborate (L–), comprising three N,N-bidentate chelating arms linked by the apical boron atom, has been synthesized; the crystal structure of [EuL(MeOH)2F][PF6] reveals the nine-coordinate metal lying within the hexadentate ligand cavity.
Tremendous efforts have been devoted to the studies of ceramic materials under transient thermal conditions over the past four decades. Such studies are becoming increasingly more important as advanced ceramic materials are demanded for applications at higher temperatures and more severe transient thermal conditions.…
All articles of this category Reproducible, high-yielding synthesis of the title compounds 2-4 , which are important precursors of highly functionalised tetrathiafulvalene derivatives and multistage redox assemblies, are described. This is demonstrated by the subsequent reactions of 3 and 4 to prepare compounds 9-16 ;…
High-resolution X-ray powder diffraction using synchrotron radiation has been used to determine the unit-cell parameters of some of the n-alkanes within the range C13H28–C60H122. These have, in general, been found to conform to the structural patterns predicted by Nyburg and Potworowski (Acta Crystallogr., Sect. B, 19…
The differential thermal analysis of a single crystal of pyridinium tetrafluoroborate was performed revealing two solid-solid phase transitions at 205 and 240 K. The real part of the dielectric permittivity was measured between 190 and 290 K. The large anomaly at the higher phase transition is interpreted as the Curie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConduction type of substituted tetraazaporphyrins and perylene tetracarboxylic acid diimides as detected by thermoelectric power measurementsD. Schlettwein, D. Woehrle, E. Karmann, and U. MelvilleCite this: Chem. Mater. 1994, 6, 1, 3–6Publication Date (Print):January 1, 1994…
I. Introduction Fibre Reinforced Polymers History of fibre reinforced polymer materials Resins Additives to resins Reinforcements Properties of composite materials Health and safety II. Techniques for Manufacture of Composites Manufacturing Processes Introduction Open mould processes Closed mould processes Continuous…
The fast-decay component of the retained polarization in lead zirconate titanate ferroelectric capacitors was examined as a function of write/read voltage, number of cycles (fatigue), and temperature. The percentage of polarization loss within 1 s after the write pulse was found to be independent of the write/read vol…
We review the results of electrical conduction and breakdown research reported mainly after 1980 in Japan, and comment on the present situation and future prospect of research work in this field. Effects of introduction of polar groups into polymers on electric strength F/sub b/ are summarized. Influences of copolymer…
To elucidate the degradation mechanism of poly(lactic acid), the decrease in the intrinsic viscosity of poly(D,L-lactide) in a homogeneous water/ acetone solution was investigated. The hydrolysis of poly(D,L-lactic acid) in water/acetone solution can be catalyzed by protons. The molecular weight degradation of solid p…
The PZT/ferrite composite materials of different types of connectivity were prepared and investigated. The firing of powder mixtures, hot pressing, alternative slicing of piezoelectric ceramic and ferrite and other techniques were used to produce the magnetoelectric composites. The most high values of the magnetoelect…
Liposomes have been investigated for use as drug carriers, and many previous studies have demonstrated enhanced efficacy of encapsulated drugs and the reduction of the side effects of drugs so entrapped. In many cases liposomal drugs are administered via the bloodstream. The stability in the bloodstream, clearance, an…
The crystal structure of lithium bis(trifluoromethanesulfonimide)[LiN(CF3SO2)2] has been solved from X-ray powder diffraction data and refined by the Rietveld method. The salt crystallises in the orthorhombic system, space group Pnaa, a= 9.6351(2)Å, b= 5.4154(1)Å, c= 16.2639(3)Å. The anion, previously uncharacterised…
Bone crystals are particularly small and hence estimating their sizes have proved to be difficult and values obtained inconsistent. Here we use rat bone crystals of different ages, as well as different synthetic carbonate apatite crystals, to compare two methods commonly used for determining bone crystal sizes. One me…
CO has been adsorbed in doses at room temperature by ceria which had been reduced with CO and then evacuated at 873 K, or only evacuated at this temperature, as well as by a Pd/CeO2 catalyst, H2-reduced and evacuated at 823 K. From comparison of the observed IR spectra with literature results concerning matrix-isolate…
The diffuse reflectance spectra of a series of chromium-supported silica aluminas, with varying SiO2 content, have been investigated before and after drying and after calcination, successive CO reductions, and recalcination. The molecular structure of chromium before drying is influenced by the isoelectric point (IEP)…
The metalation of toluene (PhCH3) with a 1: 1 mixtureof n-BuLi/MOtBu (M = K, Rb) at ambient temperature affords orange-red powders of benzylpotassium or benzylrubidium. On addition of N,N,N’,N“,N“-pentamethyldiethylenetriamine (PMDTA) the precipitates dissolve to give burgundy-red solutions, from which needles of [PhC…
Reliability and Electromigration Degradation of GaAs Microwave Monolithic Integrated Circuits (A. Christou). Simulation and Computer Models for Electromigration (P. Tang). Temperature Dependencies on Electromigration (M. Pecht & P. Lall). Electromigration and Related Failure Mechanisms in VLSI Metallizations (A. Chris…