Reentrant nematic and columnar phases in disc-like liquid crystals at atmospheric pressure
We describe the first example of reentrant ND nematic and D r columnar mesophases at atmospheric pressure in a pure disc-like compound.
Materials Literature
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Preparation of three- and four-co-ordinate gold( I ) complexes; crystal structure of bis[o-phenylenebis(dimethylarsine)]gold( I ) bis(pentafluorophenyl)aurate( I )
The addition of 1,10-phenanthroline, o-phenylenebis(dimethylarsine), or triphenylstibine to pentafluorophenyl-(tetrahydrothiophen) gold(I) leads respectively to [Au(C6F5)(phen)], [Au(pdma)2][Au(C6F5)2], and [Au(SbPh3)4][Au(C6F5)2], the pdma derivative being the first four-co-ordinate gold(I) complex whose structure ha…
Secondary Electron Emission from Al, Cu, Ag and Au Metal Targets under Proton Bombardment
The secondary electron emission coefficients, γ, for in-situ vacuum-deposited targets of Al, Cu, Ag and Au are measured under proton bombardment in the energy range 4–12 MeV at a pressure of 1–2×10 -8 Torr. The values of γ for Al are only half of those obtained experimentally by Aarset et al. The ratios between γ and…
Wetting and detergency
Conference International Conference on Surface and Colloid Science, International Conference on Surface and Colloid Science, ICSCS, Surface and Colloid Science, Fourth, Jerusalem, Israel, 1981-07-05–1981-07-10 Published Online: 2009-01-01 Published in Print: 1981-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
Small-polaron absorption in W x Mo1–x O3
Optical absorption and reflection spectra of WO3, WO3 : H0, W x Mo1–x O3 : H0, and sub-stoichiometric ternary oxides have been measured. In WO3, the free-carrier absorption at room temperature switches over to small (or intermediate) polaron absorption near 0·7 eV at low temperatures. In fully oxidized ternary oxides…
Ferroelectric reorientation of crystallites in polyvinylidene fluoride
Orientation behaviors of the polyvinylidene fluoride film drawn-rolled and of its poled film were investigated. The biaxial orientation distribution function (BODF) was determined for various reflections through the intensity peak and two kinds of integral widths, δ(2θ) and δx, obtained in terms of X-ray diffraction m…
Further studies on the spin cross-over phenomenon in di-isothiocyanatobis(1,10-phenanthroline)iron( II )
Some inconsistencies in the results of earlier Mössbauer spectroscopic and magnetic susceptibility measurements on [Fe(phen)2(NCS)2](phen = 1,10-phenanthroline) demanded a systematic reinvestigation of this system. We have prepared the complex by two different methods: precipitation in methanol (A) and extraction from…
Coal gasification processes
The latest available technology pertaining to the gasification of coal, thereby forming gaseous fuel products that are equivalent to or can be substituted for other fuels, is discussed. The coal gasification processes, including aspects of technical procedure and economic factors, are outlined. Topics of discussion in…
Electronic structure of the rhodium-rhodium bond in Rh2(O2CR)2(PY3)2 by electron spin resonance study of their cation radicals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of the rhodium-rhodium bond in Rh2(O2CR)2(PY3)2 by electron spin resonance study of their cation radicalsTakashi Kawamura, Kadzuhiko Fukamachi, Takayoshi Sowa, Shigeru Hayashida, and Teijiro YonezawaCite this: J. Am. Chem. Soc. 1981, 103, 2, 364–369Publi…
Preparation of Cationic Starch Ether: A Reaction Efficiency Study
Abstract Cationic starch ether, important as a papermaking additive, was prepared from native corn starch and 2‐chloro‐3‐hydroxypropyltrimethylammonium chloride in aqueous media in a study to ascertain conditions yielding maximum reaction efficiency (RE). Based on the amount of monomer retained after exhaustive washin…
Observation of a neutral metallo-formyl complex formed by the reaction of rhodium octaethylporphyrin hydride with carbon monoxide
Rhodium octaethylporphyrin hydride, RhOEP-(H)(OEP = octaethylporphyrin),m reacts with carbon monoxide to form a neutral metallo-formyl complex.
Explanation of the tables
Annu. Rep. Anal. At. Spectrosc., 1981, 11, 111 DOI: 10.1039/AA9811100111
The Effect of Tannic Acid on the Preservation of Tissue Culture Cells for Scanning Electron Microscopy
Treatment with tannic acid and OsO4 (TA treatment) of tissue culture cells after fixation with glutaraldehyde and OsO4 resulted in good protection of the cell features against shrinkage and thermal damage caused by subsequent procedures used for specimen preparation. A difference in the degree of shrinkage between TA-…
Neutron and electron radiation defects in titanium and tantalum monocarbides: An electrical resistivity study
The electrical resistivities of nearly stoichiometric titanium and tantalum monocarbides (TiC0.97 and TaC0.99) have been measured during fast neutron and 2.5 MeV electron irradiations at 21 K. The recovery of defects was followed up to 400 K. The radiation-induced resistivity increases were 10 times larger in TiC than…
A fluid smectic A antiphase in a pure nitro rod-like compound
A transition between a smectic A phase and a smectic A antiphase (S Ã) is observed for the first time in a pure compound : the nitrobenzoyloxybenzoate of heptylphenyl. So far, the anomalies of periodicities which are connected to this type of transition were only detected in cyano systems. Moreover, the solid phase of…
Quantitative analysis of collagen from normal developing corneas and corneal scars
We measured the relative solubility of collagen in acetic acid after pepsin digestion and tentatively identified the types of collagen present in corneas of rabbits of various ages and in corneal scar tissue, using hydroxyproline assays and polyacrylamide gel electrophoretic analyses. More than 80% of the collagen in…
Subband Gap Response of TiO2 and SrTiO3 Photoelectrodes
The response of and photoelectrodes to subband gap light has been explored as a function of numerous variables, including intensity and wavelength of light, applied potential, temperature, and electrolyte composition. The photoresponse is shown to be linear with light intensity, to depend on the square root of the app…
Crystal and Molecular Structure of[Li(tmen)]3[Er(CH3)6]
In the extremely sensitive polymethylated erbium complex (1) , the central erbium atom is surrounded by six monohapto ‐bonded methyl groups in a distorted octahedral configuration. The methyl groups are bridged pairwise by a lithium atom, which is co‐ordinated to the two nitrogen atoms of the N,N,N ′, N ′‐tetramethyle…
Molecular Spectroscopy of the Triplet State through Optical Detection of Zero-Field Magnetic Resonance
Research on the phosphorescent states of organic molecules has experienced a very active and rapid growth since World War II. The growth was undoubtedly initiated in 1944 by the identification of phosphorescence in organic molecules with the triplet state by Lewis and Kasha [1]. Since then, a great number of experimen…
X-ray and optical study of the phase transition in LiCsSO4
Lattice parameters of LiCsSO4 have been measured in the temperature range 160–550 K with an X-ray single-crystal Bond diffractometer. The monoclinic angle γ in the low-temperature ferroelastic phase has been interpreted as an order parameter. Detailed results of X-ray studies of the ferroelastic domain structure suppo…