Materials Literature
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A solute‐vacancy interaction model (SVIM) is proposed to account for the effects of minor alloying elements ( e.g. , Mo) on the breakdown of passive films. This model, which is an extension of the point‐defect model (15–17) that was previously developed to account for the growth and breakdown of passive films, assumes…
Metal-free copper and cobalt(II) binuclear phthalocyanines, in which the two phthalocyanine nuclci are covalently linked through five-atom bridges, have been prepared and characterized. Some new metal-free, copper, cobalt(II), and zinc 2,9,16,23-tetraalkoxyphthalocyanines, some of which are extremely soluble in organi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMarker displacement measurements of polymer-polymer interdiffusionPeter F. Green, Christopher J. Palmstrom, James W. Mayer, and Edward J. KramerCite this: Macromolecules 1985, 18, 3, 501–507Publication Date (Print):March 1, 1985Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydride sponge: 1,8-naphthalenediylbis(dimethylborane)Howard Edan KatzCite this: J. Am. Chem. Soc. 1985, 107, 5, 1420–1421Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1 March 1985https://pubs.acs.org/doi/10.1021/ja0029…
Abstract 1. The structure of the products obtained from the reaction of NR latex with peracetic acid depends on the reaction conditions. 2. Under controlled conditions, specific levels of epoxidized NR (ENR) can be obtained. A random epoxide distribution has been observed. These materials undergo strain crystallizatio…
The formation of metastable t ‐ZrO 2 by thermal treatment was studied in a systematic way on two different samples: a gel (G) and zirconyl acetate (A). The results show that initially nucle‐ation of t ‐ZrO 2 is favored by creation of anionic vacancies with trapped electrons. At higher temperatures the electronic defec…
Decomposition of trimethylgallium (TMG) and triethylgallium (TEG) in hydrogen and nitrogen atmospheres was studied by a quadrupole mass analyzer. The decomposition reactions of TMG in H 2 and in N 2 and of TEG in H 2 and in N 2 take place in the temperature ranges 370°–460°, 450°–570°, 220°–330°, and 270°–380°C, respe…
Abstract Heat capacity data of semicrystalline poly(oxymethylene) samples. Delrin and Celcon, are analysed in order to discuss the glass transition behaviour of this polymer. There are two types of non‐crystalline poly(oxymetheylene). the mobile and rigid amorphous parts. The glass transition of the former occurs in a…
The biodegradation of the copolymer 50:50 poly(DL-lactide-co-glycolide)-lypressin microcapsules was studied by light and electron microscopic methods and 14C release. Intramuscular injection sites of microcapsules in rats were studied by dissecting and conventional light microscopy as well as scanning (SEM) and transm…
Abstract The Al chemistry of seeps, soil solutions and soils was evaluated at the Hubbard Brook Experimental Forest in New Hampshire. Alumino‐organic substances predominated in solutions and in the free Al fraction of soils. Concentrations of both organic and inorganic forms of Al were highest at the higher elevations…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. Koma, K. Sunouchi, T. Miyajima; Summary Abstract: Fabrication of ultrathin heterostructures wi…
The variance in the sedimentation speed for a homogeneous suspension of solid spheres in a Stokes fluid is calculated for a particular choice of the distribution function of the spheres. In the infinite particle number limit, the variance is found to be infinite.
The polyaniline (PANI) is an interesting material because it can be a very stable electronic conductive polymer. It shows several electrochemical redox systems which have to be elucidated. For the application as battery material, it is the polymer probably which has the larger charge density (Ah/kg).
This paper reports on the effect of additives on the properties of injection moulded composites based on polypropylene (PP) and high density polyethylene (HDPE) filled with wood and cellulose flour. Three types of additives were studied: dispersion aids, elastomeric additives, and adhesion promoting agents. Some of th…
The fiftieth foundation anniversary of the Building and Cement Institute (Instituto de la Construcción y del Cemento "Eduardo Torroja ") has been celebrated. On this occasion, an exhibition of Eduardo Torroja’s works has been opened with the collaboration of the Civil Engineers College. At the same time, Scientific an…
Some materials usually employed in building edification have been analyzed for their radioactive contents. The specific activities of all the gamma rays emisors present in fourteen differents samples have been determined. In all the cases, only low activities (under 2 Bq/g) have been found for these samples collected…
A description is given of the properties of lead sheet for roofing and cladding purposes. Basic rules as far as installations are concerned are given, specially with respect to dimensions of the pieces, characteristics of Joints and fixings, and watertightness conditions. Compatibility of lead with other building mate…
Limits fixed in Codes for the chemical characteristics of cements have been established with semi-empirical methods, given the complexity of influencing phenomena, without correspondence between these values and the physico-chemical or mechanical properties as durability or strength. Knowledge of statistical distribut…
In Colombian ways and means, since the application of no traditional constructive systems is growing up, and having recourse to the new Seismic Construction Code, it is necessary to work with cement mortars of defined and reproducible characteristics. An analysis of the variability affecting the mortars behaviour was…