Electrically conducting transition metal complexes of tetrathio-oxalate
Oligomeric complexes of tetrathio-oxalate with NiII, CuII, and PdII have been synthesized to yield materials having high electrical conductivities of up to 20 S cm–1.
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Electrochemical Investigation of Hydrogen Storage in Metal Hydrides
A new technique has been developed to study and control hydrogen storage in solid metal hydrides. The formation of metal hydrides and their thermodynamic and kinetic properties have been investigated by electrochemical methods employing a low temperature molten salt galvanic cell of the type The choice of the electrol…
Optical properties of anisotropic periodic helical structures
An optical model is considered describing a wide class of optically anisotropic media such as chiral smectic liquid crystals and, in the limiting cases, cholesteric liquid crystals and anisotropic homogeneous media. It describes a structure having a periodicity along a given axis generated by a uniform rotation of the…
Studies on singlet oxygen in aqueous solution. Part 2. Water-soluble square-planar nickel complexes as quenchers
Three water-soluble square-planar nickel complexes have been investigated as quenchers of 1O2 in aqueous solution, using anthracene-9,10-bis(ethanesulphonate) as a trap. Disodium [NN′-ethylenebis(5-sulphosalicylideneiminato)] nickelate(II) and its propylene analogue are efficient quenchers, with kQ= 1.6 × 109 and 1.3…
Nearly Perfect Shape Memory Effect in Fe–Ni–C Alloys
Fig. 2 (a) Surface relief of martensite induced by bending at 77K in 25% ausformed specimen of Fe-3 1Ni-0.4C. (b) Identical area to (a) after heating to 550K .
The Chemistry of Platinum in the +3 Oxidation State
Abstract Platinum(III) is no longer an uncommon oxidation state. Numerous binuclear platinum(III) complexes have been prepared and structurally characterized over the past eight years. These include sulfate‐bridged dimers of D 4 h symmetry, [Pt 2 (SO 4 ) 4 L 2 ] 2− , L = H 2 O, DMSO; phosphate‐bridged complexes [Pt 2…
Microencapsulation and Controlled Release of Insulin from Polylactic Acid Microcapsules
Insulin has been encapsulated in biodegradable polylactic acid microcapsules and non-biodegradable ethylcellulose microcapsules by using an emulsification-solvent evaporation process. Gelatin and polyvinylalcohol were used as protective colloids. The concentrations and types of protective colloids affecting the microm…
Mechanisms of epoxidation during ozonation of carbon-carbon double bonds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of epoxidation during ozonation of carbon-carbon double bondsPhilip S. Bailey, Hank H. Hwang, and Chin Yun ChiangCite this: J. Org. Chem. 1985, 50, 2, 231–234Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue 1…
Polymer degradation & stabilisation
The study of polymer degradation and stabilisation is of considerable practical importance as the industrial uses of polymeric materials continue to expand. In this book, the authors lucidly relate technological phenomena to the chemistry and physics of degradation and stabilisation processes. Degradation embraces a v…
Effects of Radiation on Materials: Twelfth International Symposium
Description Two volumes present recent research on radiation damage to structural materials in both fission and fusion environments. Seventy papers discuss: irradiation creep of structural metals; microstructural development; neutron-induced swelling; charge particle irradiation; theory of swelling; mechanical propert…
Cooperative phenomena in crystals containing off-center ions—dipole glass and ferroelectricity
Кооперативные явления РІ кристаллах СЃ нецентральными ионами — дипольное стекло Рё сегнетоэлектричество, Вугмейстер Р‘.Р•., Глинчук Рњ.Р”.
Effect of Impurity and Carrier Concentrations on Electrical Resistivity and Thermal Conductivity of Sic Ceramics Containing BeO
Silicon carbide ceramics with BeO as an additive exhibit unusually high electrical resistivity and thermal conductivity compared to conventional SiC ceramics. Studies concerning the effects of carrier concentration in the SiC grains on electrical properties and thermal conductivity are described. The low carrier conce…
Techniques of radiation dosimetry
Preface RADIATION ROUND-UP: Introductory Aspects of Radiation Basic Concepts of Radiation Physics and Dosimetric Units IONIZATION METHODS: Ionization Chamber Dosimetry Semiconductor-Junction Dosimetry Ion Implantation Dosimetry THERMAL METHODS: Thermoluminescence Dosimetry Thermally Stimulated Conductivity (TSC) Dosim…
Accuracy of transmission electron microscopy for the analysis of asbestos in ambient environments
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAccuracy of transmission electron microscopy for the analysis of asbestos in ambient environmentsEric B. Steel and John A. SmallCite this: Anal. Chem. 1985, 57, 1, 209–213Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue…
Crystal and molecular structures and magnetic properties of four new exchange-coupled copper(II) complexes derived from different 3-N,N-dialkylamino-1-propanols and pseudohalogens
The crystal and molecular structures of (3-N,N-dimethylamino-1-propanolato) isocyanatocopper(II)(1), (3-N,N-dimethylamino-1-propanolato) isothiocyanatocopper(II)(2), (3-N,N-diethylamino-1-propanolato) isothiocyanatocopper(II)(3), and (3-N,N-di-n-butylamino-1-propanolato)isothiocyanatocopper(II)(4) have been determined…
Citric acid cycle enzymes of the archaebacteria: citrate synthase and succinate thiokinase
In eubacteria and eukaryotes, citrate synthase and succinate thiokinase exhibit a species‐dependent diversity of structure, activity and regulation. These enzymes have now been examined in the archaebacteria and it is found that each of the three major subgroups, the extreme halophiles, the thermoacidophiles and the m…
Adiabatic calorimetry measurements in the vicinity of the nematic-smectic A-smectic C multicritical point
High-resolution adiabatic calorimetry has been used for the study of the nature of the NAC (nematic-smectic A-smectic C) multicritical point in the mixture of 4-n-hexyloxyphenyl-4'-n-octyloxybenzoate (608) and 4-n-hexyloxyphenyl-4'-n-decyloxybenzoate (6010). The N-C transitions are weak first order however the transit…
Distribution of Palygorskite in Sediments and Soils of Eastern Saudi Arabia
Abstract Rock samples representing different soil parent materials from the Jurassic, Cretaceous and Tertiary periods in eastern Saudi Arabia were investigated for their mineralogical and chemical properties. Samples from five soil profiles found on these rocks also were studied. Palygorskite was found to be the domin…
Two determinations of W for electrons in dry air
Two experimental determinations of W, the average energy required to produce an ion pair in dry air, for electrons arising from 60 Co radiation, are presented. One is based on calorimetric and ionometric measurements of absorbed dose in graphite, the other on activity and exposure measurements. The values obtained by…
High-pressure i.r. spectroscopic evidence of acetyl and acetate species directly formed in CO–H 2 conversion on SiO 2 -supported Rh and Rh–Mn catalysts
By in situ high-pressure i.r. spectroscopy acetyl [MeCO] as a possible intermediate for C2-oxygenates and acetate surface species are observed over Rh/SiO2 and Rh–Mn/SiO2 catalysts in a CO–H2 reaction (CO/H2= 0.5, 30–50 kg/cm2, 230–270 °C).