Materials Literature
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Abstract Stability equations were derived for Belle Fourche and Aberdeen montmorillonites. Both the composition of structural ions and the cation exchange capacity (CEC) were considered to be essential features of montmorillonite stability. However, montmorillonite stability was considered to be independent of the sol…
Abstract High molecular weight poly‐N,N′‐(4,4′‐diphenylether)pyromellitimide film was prepared from pyromellitic dianhydride and 4,4′‐diaminodiphenylether and the oxidative degradation at 400°C was studied by weight loss measurements, infrared spectrometry and saponification experiments. The results indicated the rapi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEllipsometric investigations of anodic film growth on iron in neutral solution. Prepassive filmJ. O'M. Bockris, H. Wroblowa, and V. BrusicCite this: J. Phys. Chem. 1971, 75, 18, 2823–2829Publication Date (Print):September 1, 1971Publication History Published online1 May 2002…
Cotton fibers were broken under a variety of conditions and the fractures were examined in a scanning electron micro scope. Many fractures occur adjacent to the reversal zone and not through it, indicating that the reversal itself is strong, but, because of its existence in the fiber, it is a source of weakness in tha…
A synthetic medium was developed for further study of intracellular calcification by Bacterionema matruchotii. The medium contained metastable calcium phosphate, six other salts, three purines, two pyrimidines, nine vitamins, pimelic and thioctic acids, vitamin-free casein hydrolysate, and glucose. The vehicle was 0.1…
The Stoner-Wohlfarth coherent rotation model has been extended to particle sizes approaching the superparamagnetic critical size Scfor the case of barium ferrite. It is shown that at particle volumes up to100 S_{c}, the coercivity factor will be lower than the Stoner-Wohlfarth factor of 0.48. Experimentally, micro-pow…
Abstract Differential thermal analysis (DTA) of some commercial nylons has disclosed some anomalous phenomena with respect to the glass transition, generally considered to occur at 40–50°C. On the first heat cycle the transition occurs normally. On cooling, however, no corresponding transition occurs, and on an immedi…
Data concerning the types of charge carrier responsible for electrical conduction in single‐crystal aluminum oxide are reviewed, and explanations are offered for discrepancies in terms of the experimental conditions. Measurements on undoped and Co 2+ and Mg 2+ doped crystals, made using a volume guard to avoid surface…
Abstract The autoxidation of organic compounds, RH, occurs by a radical‐catalyzed chain reaction to give hydroperoxides, RO 2 H, as primary products. The initial rate is ‐d[O 2 ]/dt = k p [RH] {k i [Cat]/k t } 1/2 , or in the presence of an inhibitor, (In), k p [RH](k i [Cat]/k I [In]), where k p is the chain propagat…
1. Insoluble polymeric collagens from various human tissues were prepared by the EDTA method. Almost all of the collagen from simple soft tissues such as dermis, tendon, submucosa, sclera and cornea could be extracted, whereas the more complex tissues such as intercostal cartilage and intervertebral disc yielded only…
Abstract The dehydrochlorination of PVC under vaccum has been studied at 170–200°C by a volumetric method. The accelerating effect of HCl is related to its interaction with the forming polyene units of macromolecules. A mechanism is proposed. The effects of various stabilizers, such as organic salts of Ca, Ba, Cd, tri…
Abstract Nitrate adsorption by subsoils of Andepts, Oxisols, and Alfisols from Mexico and South America was studied using a batch‐type technique. Nitrate adsorption increased as the acidity of the suspension increased to about pH 3.5. This increase was directly proportional, but not equivalent, to the amount of hydrog…
Eigh t iso th ermal e quati ons of s ta te a re analyze d to yield quantitativ e m eas ures of th e degrees to whi c h eq uat ion pa irs can be di sc rimin ated for real data , data of limite d s pan a nd prec is ion. Calc ul a ted c urv es a ll ow one to assess th e spa n a nd precis ion necessa ry in PV data to a ll…
Abstract The infrared spectra of undenatured bovine tendon collagen were investigated at 25°C and relative humidities from 0 to 95%. Suitable samples were prepared by forcing frozen suspensions of the material in distilled water through a stainless steel capillary. The samples were investigated by electron microscopy…
Abstract Systeme aus monomolekularen Schichten können Funktionseinheiten bilden, welche Eigenschaften entfalten, die den Einzelschichten fehlen. So findet z. B. bei UV‐Bestrahlung ein Energieübergang von einer Sensibilisator‐(S‐) Schicht auf eine Acceptor‐(A‐) Schicht statt, der sich durch Fluoreszenz von A zu erkenne…
Abstract Physical changes induced by prolonged Ca(OH) 2 ‐treatment were determined for natural peds from specific horizons of Beaumont, Hiwassee, Houston Black, Katy, and Nacogdoches soils. Confined swelling pressures, liquid limits, and plasticity indexes decreased substantially for soil peds treated with 5% Ca(OH) 2…
Abstract The rates of shear encountered in topical application of cosmetic creams and lipstick were obtained by dividing the application velocities, at which the samples are being sheared, by the applied thicknesses of the layer. The application velocity was measured by means of a high‐speed camera. Beauty artists, fo…
Abstract On the basis of morphology, pH, and solubility in Na 4 P 2 O 7 , three Wisconsin histosols were classified as (i) a Fibrist, (ii) a Hemist, and (iii) a Saprist. Fiber content was found to be the single most useful characteristic in the classification of these Histosols, and in quantifying various stages of de…
Abstract This study was undertaken to measure quantitatively the flammability characteristics of cotton and polyester fibers. The smoke density generated during the burning of these fabrics was also studied at various temperature conditions. A mathematical relationship was established between the results obtained in a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-Scattering Studies on Polystyrene-Polyisoprene Block CopolymersJ. Prud'homme and S. BywaterCite this: Macromolecules 1971, 4, 5, 543–548Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https://pub…