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We have used chiral compounds with very high helical twisting power as components in induced-cholesteric mixtures in order to obtain new blue phase systems. In one of these mixtures an unusual large blue phase temperature range of more than 10 K was observed. The lattice constant of the BPI in this system increases st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of quenched disorder on phase transitions in the mixed-valence solid solution [FeIII2FeII1-xCoIIxO(O2CCH3)6(py)3](py)Ho G. Jang, Kazutoshi Kaji, Michio Sorai, Richard J. Wittebort, Steven J. Geib, Arnold L. Rheingold, and David N. HendricksonCite this: Inorg. Chem. 19…
A mullite precursor sol was prepared by mixing boehmite and silica sols. On addition of 3.5 wt% F − ion as a 47% solution of HF, the mullite sol was gelled. The dried gel was ball‐milled and calcined at 1400°C for 1 h in an airtight container. Mullite whiskers grew on the (111) plane along the 〈001〉 direction.
We explain the deep electrical conductivity minimum near x=0.05 in the perovskite-type ceramic ${\mathrm{LaCr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Mn}}_{\mathit{x}}$${\mathrm{O}}_{3}$ as a crossover between two different regimes of hopping conduction. At low Mn concentrations the diffusion of small polaron…
3-O-Methyl-D-glucose (methylglucose) is often used to study blood-brain barrier transport and the distribution spaces of hexoses in brain. A critical requirement of this application is that it not be chemically converted in the tissues. Recent reports of phosphorylation of methylglucose by yeast and heart hexokinase h…
A cDNA clone of silkworm (Bombyx mori) larval hemolymph antitrypsin (sw-AT) has been isolated from a fat body cDNA library. The cDNA has an open reading frame which codes a 392-amino acid residue polypeptide comprising a 16-residue signal peptide and a 376-residue mature sw-AT of Mr 41,805. The reactive site of sw-AT…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe tetranuclear trianion [Fe4Te4(SC6H5)4]3-: crystal and molecular structure and magnetic propertiesPierluigi Barbaro, Alessandro Bencini, Ivano Bertini, Fabrizio Briganti, and Stefano MidolliniCite this: J. Am. Chem. Soc. 1990, 112, 20, 7238–7246Publication Date (Print):Se…
A new spectrometer design is presented in which the angular dispersion with respect to wave number is nearly constant. The spectrometer is a type of grism, a series combination of grating and prism, in which the constant parts of the dispersion terms add to one another but the slopes of the dispersions tend to cancel…
Abstract The preparation of green rusts from sulphate solutions and representative Mössbauer spectra are described. As the samples oxidized readily, attention focused on the Mössbauer parameters at liquid nitrogen and helium temperatures. The spectra recorded at 77 K could be fitted satisfactorily with one ferrous iro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetochemistry of the tetrahaloferrate(III) ions. 1. Crystal structure and magnetic ordering in bis[4-chloropyridinium tetrachloroferrate(III)]-4-chloropyridinium chloride and bis[4-bromopyridinium) tetrachloroferrate(III)]-4-bromopyridinium chlorideJalal A. Zora, K. R. Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction study of the electronic ground state of (meso-tetraphenylporphinato)iron(II)Naiyin Li, Zhengwei Su, Philip Coppens, and John LandrumCite this: J. Am. Chem. Soc. 1990, 112, 20, 7294–7298Publication Date (Print):September 1, 1990Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the anionic polymerization of phenylvinylsulfoxide and its copolymer with styreneRustom S. Kanga, Thieo E. Hogen-Esch, E. Randrianalimanana, A. Soum, and M. FontanilleCite this: Macromolecules 1990, 23, 19, 4235–4240Publication Date (Print):September 1, 1990Public…
Activated carbon (AC) is an increasingly important electrode material for such applications as electrosorption, electrosynthesis, and electrical energy storage. An accurate description of the potential distribution within the electrode is essential to understanding the overall process behavior in all of these applicat…
Abstract The kinetics of clay formation in buried paleosols developed from late Quaternary rhyolitic tephra layers near Rotorua, New Zealand, can be described in terms of a combination of parabolic and linear kinetics, reflecting the hydration of glass, and the formation of clay minerals, respectively. Such a model is…
Strain softening, no matter how small, is usually accompanied by localization of the softening deformation field. Inside the zone of localization, a decrease in stress is accompanied by an increase in strain; outside the zone the strain decreases. One way to describe this phenomenon is to use a nonlocal theory of plas…
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…