Materials Literature
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A technique involving rapid scratching of rotating disk electrodes under potential control is presented and used to examine rapid reaction steps in the anodic behavior of iron in aqueous solutions of p H 0–14. Both anodic and cathodic reaction rates are greatly accelerated during scratching; current densities of up to…
In polypeptide liquid crystals deuterium NMR spectra of labeled guest molecules and labeled Polybenzylglutamate exhibit a characteristic doubling (anisochronism) of the quadrupolar splittings of enantiotopic deuterons. The anisochronism is a reflection of local chirality. For achiral guests the chirality is acquired i…
Calcium silicate hydrates (C–S–H), prepared at 20 °C and 50 °C to have various CaO : SiO2 molar ratios (n), were examined for their compositions with particular attention to the combined water contents and to their solubilities in water at 30 °C. The C–S–H gels may be described as solid solutions of the type nCaO·SiO2…
Abstract 1,2‐Bis‐[4‐n‐alkyloxybenzoyl]‐hydrazines with the general formula magnified image possess smectic C phases and at lower temperatures additional optically isotropic phases. According to X‐ray investigations these isotropic phases show cubic symmetry. The lattice units consist of aggregations with micellar dime…
Measurements of the « splay » and « bend » constants for nematic 4'-n-pentyl-4-cyanobiphenyl are described. The method used was a conventional one, but particular care was taken to ensure reproducible and reliable results. The results are compared with those of previous authors and with predictions based on the mean f…
The pale yellow title compounds undergo reversible photochemical conrotatory electrocyclic reactions to give in quantitative yields deep red 7,7a-dihydrobenzo[b]furan-5,6-dicarboxylic anhydrides, which are stable at 100 °C. These photochromic systems, which have high quantum yields for photocolouration, are highly res…
A variety of models has been developed to represent transformers in switching surge studies. However, there is a paucity of data on the characteristics of large power transformers to provide parameters for utilization in the models. This paper describes a low power field method of saturating large transformers and plo…
The aim of this work is to examine the effects that certain plasticisers have on the properties of aqueous based hydroxypropylmethylcellulose (HPMC) films of a type used for film coating tablets, and to investigate whether or not the inclusion of these additives is in fact beneficial in all cases.The film former HPMC…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-crossover ferric complexes: curiosities observed for unperturbed solidsMuin S. Haddad, Michael W. Lynch, Wayne D. Federer, and David N. HendricksonCite this: Inorg. Chem. 1981, 20, 1, 123–131Publication Date (Print):January 1, 1981Publication History Published online1 M…
Results are presented for the total and metallic nickel areas of a series of coprecipitated nickel–alumina catalysts prepared and pretreated in different ways. The total areas of the samples decrease on reduction and with increasing reduction temperature, while the nickel area increases with reduction temperature. Inc…
Despite much investigation of the electrochromic (EC) coloration process in WO 3 films, such displays have not yet become commercially viable because of limited useful device life. Device degradation occurs by WO 3 film dissolution on the shelf and erosion during cycling. Water plays a crucial role in both efficient c…
Crystal forms and crystal structure of the metastable polyhydrate (weddellite) and the stable monohydrate (whewellite) occurring in plant cells are described and their formation as well as their physiological bearing are discussed.
The surface composition of p-type GaAs etched in HCl or Br2 in methanol, and n-type InP etched in HCl, H2SO4, HNO3, or Br2 in methanol has been studied by means of x-ray photoelectron spectroscopy (XPS). The surface compositions of GaAs and the binding energy of the surface As atoms vary with the etching solution and…
Crystal growth from solution phases is most universal and important in natural crystallization. Its essential features are : 1) mass transfer and 2) interaction between solid and liquid phases, in addition to lower growth temperatures, and, in general, smoother solid-liquid interfaces, as compared to melt growth. The…
"An Introduction to Metallic Corrosion." British Corrosion Journal, 16(4), p. 186
\n\t\t\t\t\tMeasurements of the force as a function of distance between two solids separated by a liquid crystal film give information on the structure of the film. We report such measurements for two molecularly smooth surfaces of mica separated by the nematic liquid crystal 4'-n-pentyl 4-cyanobiphenyl (5CB) in both…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox properties of metalloporphyrin excited states, lifetimes, and related properties of a series of para-substituted tetraphenylporphine carbonyl complexes of ruthenium(II)D. P. Rillema, J. K. Nagle, L. F. Barringer Jr., and T. J. MeyerCite this: J. Am. Chem. Soc. 1981, 10…
The phase diagram of the Bi 2 O 3 ‐ Dy 2 O 3 system was investigated. A monophasic fcc structure was stabilized for samples containing 28.5 – 50.0 mole percent ( m / o ) Dy 2 O 3 . Above and below this concentration range polyphasic regions appear. The fcc phase showed high oxygen ion conduction. The ionic transferenc…
Thermal analysis has recently become prominent, particularly in applications to fibers, plastics, and other synthetic polymeric materials. Thermal analysis may be defined as a set of techniques used to describe the physical or chemical changes associated with substances as a function of temperature [1]. Thermograms ha…
Magnetically responsive albumin microspheres containing doxorubicin and magnetite (Fe3O4) were selectively targeted to Yoshida sarcoma tumors in rats by utilizing an extracorporeal magnet. Tumor cells were inoculated subcutaneously in the tail of rats, and the tumors were allowed to grow to an average size of 9 X 45 m…