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A previously described technique for measuring the order of phase transitionsl-3 using DSC has been applied to the liquid crystalline transitions found in TBBA. All of the values obtained were in agreement with those that have been measured by other techniques, and also with what would be anticipated from the nature o…
Oxidation of wustite‐type solid solutions (A, B)0 and reduction of sesquioxide solid solutions (A, B) 2 0 3 can lead to the precipitation of a spinel phase (A, B) 3 0 4 at an inner reaction front. A representation of the reaction scheme and kinetics for each of the two cases will be given. Observations on the macrosco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxotungstate anions containing high-valent rhenium. 1. Keggin anion derivativesFernando Ortega and Michael T. PopeCite this: Inorg. Chem. 1984, 23, 21, 3292–3297Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 Octo…
Shear piezoelectricity is observed in uniaxially oriented system of optically active biopolymers such as polysaccharides, polypeptides and polynucleotides. The magnitude of the piezoelectric constant is proportional to the degree of crystallinity, the degree of orientation and the piezoelectric constants in single cry…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and structure of hexakis(thiourea-S)technetium(III) trichloride tetrahydrate, [Tc(SC(NH2)2)6]Cl3.4H2OM. J. Abrams, A. Davison, R. Faggiani, A. G. Jones, and C. J. L. LockCite this: Inorg. Chem. 1984, 23, 21, 3284–3288Publication Date (Print):October 1, 1984Publicat…
Abstract The influence of crystallinity and crosslinking on the depression of the glass transition temperature in nylon 6 by water has been investigated by dynamic mechanical methods. Radiation crosslinking by high‐energy electrons was effective in preventing morphological changes during the measurement of the increme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA molecule containing the OWOWO unit. Synthesis, structure and spectroscopy of hexaneopentylditungsten trioxideIrene Feinstein-Jaffe, Dan Gibson, Stephen J. Lippard, Richard R. Schrock, and Alan SpoolCite this: J. Am. Chem. Soc. 1984, 106, 21, 6305–6310Publication Date (Prin…
Abstract Sulfate adsorption on kaolinite was followed at 0.7 μ eq/ml to 99 μ eq/ml solution concentrations at 30°C and at pH 6.0, and the amount of OH~ ions released and the change in surface charge were determined. Sulfate was adsorbed at positive and neutral sites by displacing OH 2 and OH − groups, respectively. Ad…
The magnetic structure of the hexagonal polymorph of FeGe has been investigated by means of neutron diffraction on single crystals at low temperature and for magnetic fields applied perpendicular to the c axis. Between 410 and approximately 55K the magnetic structure is collinear c-axis antiferromagnetic. Below approx…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of the first cyclodiphosphazene. Dimerization of a phosphonitrile :P.tplbond.NAntoine Baceiredo, Guy Bertrand, Jean Pierre Majoral, Ghislaine Sicard, Joel Jaud, and Jean GalyCite this: J. Am. Chem. Soc. 1984, 106, 20, 6088–6089Publication Date (Print)…
A major unsolved problem in cellulose structure is the polarity of adjacent chains of cellulose in the microfibrils, namely, the "parallel or antiparallel" problem.This issue is closely related to the possibility of a folded-chain structure and to the mechanism of cellulose biosynthesis.The prevailing view, based on x…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of point efficiencies on sieve trays. 1. Binary systemsHong Chan and James R. FairCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 4, 814–819Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 October 198…
The composition and application of a single, chemically defined medium or growth and sporulation of Bacillus subtilis is described. At 37 degrees C cells grew with a doubling time of about 40 min; cultures attained near-maximal spore formation (70 to 80% by 12 h after the end of exponential growth and produced 1 X 10(…
The alanine racemase encoded by the Salmonella typhimurium dadB gene was purified to 90% homogeneity from an overproducing strain. At 37 degrees C the enzyme has a specific activity of 1400 units/mg (V max, L- to D-alanine). Active enzyme molecules are monomers of Mr 39 000 with one molecule of pyridoxal 5'-phosphate…
The elastic-distortion free-energy density of biaxial nematics is derived with use of the formalism of tensor analysis. The macroscopic description of biaxial nematics involves 12 bulk elastic constants. The appearance of chirality introduces an additional number of 5 twist terms.
Changes in the phase composition and microstructure of yttria‐partially‐stabilized zirconia by low‐temperature annealing were investigated at 100° to 500°C using bodies sintered from coprecipitated fine ZrO 2 ‐Y 2 O 3 powders at varied temperatures. Tetragonal zirconia on the surfaces of bodies sintered at <1500°C…
Abstract This review summarizes the different ideas to breakdown of passivity and localized corrosion. On the basis of experimental results a critical discussion of the main mechanisms is presented. The subdivision into different stages of growth of corrosion pits tries to reduce the controversial opinions and to avoi…
de Gennes gave a three-parameter representation of strain energy in a cholesteric liquid crystal that is second order on the $Q$ tensor, and hence in order parameter. He discarded a term involving an elastic constant ${K}_{24}$ which is relevant at surfaces and disclinations. The splay and bend elastic constants ${K}_…
In situ laser Raman spectra of anodic corrosion films formed on Ni and Co in have been obtained for the first time and the composition of the surface films deduced. The Raman spectrum of the film found on Ni at about 0.6V vs. corresponds closely to that of hydrated . The anodically formed film on Co at about 0.45V app…
Abstract Effects of structural relaxation and the glass‐transition process are clearly manifested in the electrical behavior of glassy‐chalcogenide films. Analysis of the transport and trapping of photoinjected carriers and of the thermal generation of free carriers in the bulk reveal that in chalcogenides each of the…