N-(o-carboxybenzyl) chitosan, N-carboxymethyl chitosan and dithiocarbamate chitosan: new chelating derivatives of chitosan
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Selective permeability of PVA membranes. II. Heat-treated membranes
The water and salt transport properties of untreated and heat-treated poly(vinyl alcohol) (PVA) membranes were investigated. Water and salt permeabilities decreased abruptly as a result of heat treatment. The effect of heat treatment on the water and salt transport in PVA is expressed mainly by changes in the activati…
Grain‐Size Dependence of Fracture Energy in Ceramics
A simple model incorporating thermal elastic anisotropy stresses is used to calculate the microcrack zone size around cracks in Al 2 O 3 . It is found that the ratio of microcrack zone size to grain size is almost constant for notched beam tests, but increases with grain size for double cantilever beam data. It is sug…
Displacive-order-disorder crossover at the ferroelectric-paraelectric phase transitions of BaTiO3 and LiTaO3
A detailed comparison between accurate infrared reflectivity data and dielectric constant ε0(T) measurements has been carried out in ABO3 ferroelectrics. In BaTiO3, the ferroelectric mode saturates above the cubic-tetragonal transition, whereas ε0( T) tends to diverge. This supports an intrinsic crossover from displac…
Plastic Deformation of <I>bcc</I> Metal Single Crystals at Very Low Temperatures
Single crystals of high-purity (RRR\simeq4000) niobium were tested in tension in the temperature range of 2 K–350 K to study the low temperature plasticity. Activation analyses of the results showed that an Arrhenius type strain-rate equation appeared to hold above 50 K but not below this temperature. Increase of the…
The structural behaviour of the nepheline family: (1) Sr and Ba aluminates (MAl2O4)
Abstract The structural relations of solid solutions in the series (Sr 1−x Ba x )Al 2 O 4 were studied using room- and high-temperature X-ray methods, infra-red spectroscopy, and DTA. At room temperature, SrAl 2 O 4 and solid solutions with x up to 0.31 are monoclinic, between x = 0.31 and 0.43 monoclinic and hexagona…
A new thermotropic smectic phase made of ribbons
From microscopical observations and structural studies on the mesophases of a new thermotropic polar compound — the nitrobenzoyloxybenzoate of octylphenyl — we have shown the existence of a novel fluid mesophase built with ribbons forming a two-dimensional oblique lattice. We propose a crude model based upon structure…
Photocatalytic oxidation of organic compounds using heteropoly electrolytes of molybdenum and tungsten
The photosensitivity of heteropoly-compounds in the presence of organic compounds, which results in reduction of the former and oxidation of the latter, coupled with the ease of reoxidation, by oxygen, of some of the heteropoly-compounds, provides the basis for photocatalytic oxidation of organic compounds.
The synthesis of long-chain unbranched aliphatic compounds by molecular doubling
A convenient General synthesis, applicable to alkanes and terminally mono- and di-substituted alkanes of any chain length, is described; cyclododecanone is used as the starting material, and the C12 chain is doubled in length as often as required and adjusted first to a multiple of 12, and than to any desired length.
Ultra-Low-Noise 1.2- to 1.7-GHz Cooled GaAsFET Amplifiers
A 3-stage GaAsFET amplifier operating at 13 K, utilizing source inductance feedback is described. The amplifier has a noise temperature of15 dB over the 1.2- to 1.7-GHz frequency range.
The heteropolyvanadate of phosphorus. Crystallographic and NMR studies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe heteropolyvanadate of phosphorus. Crystallographic and NMR studiesReizo Kato, Akiko Kobayashi, and Yukiyoshi SasakiCite this: Inorg. Chem. 1982, 21, 1, 240–246Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 Januar…
Vibrational investigations of polyoxometallates. 1. Valence force field of Mo6O192- based on total isotopic substitution (oxygen-18, molybdenum-92, molybdenum-100)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational investigations of polyoxometallates. 1. Valence force field of Mo6O192- based on total isotopic substitution (oxygen-18, molybdenum-92, molybdenum-100)Claude Rocchiccioli-Deltcheff, Rene Thouvenot, and Monique FouassierCite this: Inorg. Chem. 1982, 21, 1, 30–35Pu…
Properties and applications of metal hydrides in energy conversion systems
Structural, thermodynamic, and kinetic properties and phase diagrams of hydrogen in metals and alloys are presented in relation to materials development for the ‘hydrogen energy technology'. Among the materials considered special attention is paid to the hydrides of Li, Mg, Y, V, Nb, U, TiFe, and LaNi5. It is shown ho…
Snow crystals
The growth of the snow crystal is an important example of crystal growth not attributable to the presence of screw dislocations. More than 400 years of study of the habits of these crystals culminated in the work of Nakaya establishing the complex and abrupt changes of crystal habit with temperature and humidity, and…
Profile Fitting for Quantitative Analysis in X-Ray Powder Diffraction
Quantitative phase analysis by powder diffractometry requires accurate measurement of the integrated intensities of the diffracted, lines. When lines are isolated and on simple backgrounds, count integration techniques work very well. However, when one or more lines overlap the line of interest, or a complex backgroun…
Crystal Structures for the Electron Donor Dibenzotetrathiafulavalene, DBTTF, and Its Mixed-stack Charge-transfer Salts with the Electron Acceptors 7,7,8,8-tetracyano-p-quinodimethane, TCNQ, and 2,5-difluoro-7,7,8,8-tetracyano-p-quinodimethane, 2,5-TCNQF2
Crystal structures for the electron donor DBTTF and its charge-transfer salts with the acceptors TCNQ and 2,5-TCNQF2 are reported. Crystal data for the three systems are as follows: (a) neutral DBTTF; monoclinic, space group P21/c, a=12.082(2) Å, b=3.955(1) Å, c=14.553(2) Å, β=114.36(1)0, V=633.6 Å3; (b) DBTTF-TCNQ; t…
Temporary anion states of phosphabenzene, arsabenzene, and stibabenzene. Trends in the .pi. and .pi.* orbital energies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemporary anion states of phosphabenzene, arsabenzene, and stibabenzene. Trends in the .pi. and .pi.* orbital energiesP. D. Burrow, A. J. Ashe III, D. J. Bellville, and K. D. JordanCite this: J. Am. Chem. Soc. 1982, 104, 2, 425–429Publication Date (Print):January 1, 1982Publ…
Properties of low molecular weight block copolymers. 1. Differential scanning calorimetry of styrene-dimethylsiloxane diblock copolymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of low molecular weight block copolymers. 1. Differential scanning calorimetry of styrene-dimethylsiloxane diblock copolymersSonja Krause, Magdy Iskandar, and Mohammad IqbalCite this: Macromolecules 1982, 15, 1, 105–111Publication Date (Print):January 1, 1982Publi…
Mechanisms for the photooxidation of protoporphyrin IX in solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms for the photooxidation of protoporphyrin IX in solutionG. Sidney Cox and David G. WhittenCite this: J. Am. Chem. Soc. 1982, 104, 2, 516–521Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 January 1982https:/…
Dimeric copper( II ) compounds with a tripodal imidazole-containing ligand and bridged by imidazolate, benzimidazolate, and benzotriazolate ions. Crystal and molecular structure of µ-(benzotriazolato-N 1 ,N 3 )bis{[tris(N 1 -methylbenzimidazol-2-ylmethyl)amine-N,N 3 ,N 3 ′,N 3 ″]copper( II )} trinitrate
A series of dimeric copper(II) co-ordination compounds with general formula [Cu2(tmbma)2(azolate)]X3 has been prepared and characterized, where tmbma is the tripodal benzimidazole-containing ligand tris(N-methylbenzimidazol-2-ylmethyl)amine, azolate is the anion of imidazole, benzimidazole, or benzotriazole, and X = N…