Materials Literature
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Large photoconductive effects have been observed on single crystals of ZnO at 300\ifmmode^\circ\else\textdegree\fi{}K and 78\ifmmode^\circ\else\textdegree\fi{}K. At 300\ifmmode^\circ\else\textdegree\fi{}K the decay of the photoconductivity is strongly dependent on the ambient conditions, being slow in vacuum and fast…
Iodine sorption and moisture sorption data and some density, x-ray, and infrared data have been obtained on partially acetylated (PA) cottons before and after progres sice deacetylation with 2 N hydrochloric acid or with N 2 sodium hydroxide. The re sults substantiate the accepted theory that in the partial acetylatio…
Measurements are reported of the thermal conductivity of glassy selenium and polycrystalline metallic (hexagonal) selenium at temperatures from 2\ifmmode^\circ\else\textdegree\fi{} to above 100\ifmmode^\circ\else\textdegree\fi{}K. At the higher temperatures, the heat conductivity, $\ensuremath{\lambda}$, for the glass…
Pseudoternary System Calcium
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInhibition of Foaming. IX. Changes in the Rate of Attaining Surface Tension Equilibrium in Solutions of Surface-active Agents on Addition of Foam Inhibitors and Foam StabilizersSydney Ross and R. M. HaakCite this: J. Phys. Chem. 1958, 62, 10, 1260–1264Publication Date (Print…
Received 12 September 1958DOI:https://doi.org/10.1103/PhysRevLett.1.239©1958 American Physical Society
The effect of transition metal, alkali, alkaline‐earth, and heavy metal oxide additions on the sintering of magnesia was determined by measuring bulk density and shrinkage. Polished specimens were made on selected compositions and the grain structure was photographed. The unusual effect of titanium, zirconium, silicon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWetting of Polymer Surfaces. I. Contact Angles of Liquids on Starch, Amylose, Amylopectin, Cellulose and Polyvinyl AlcoholB. Roger Ray, J. R. Anderson, and J. J. ScholzCite this: J. Phys. Chem. 1958, 62, 10, 1220–1227Publication Date (Print):October 1, 1958Publication Histor…
Several theoretical analyses of the process of magnetization reversal in thin films by coherent rotation of the magnetization vector have been published. However, these analyses suffer from the use of questionable assumptions and from a lack of generality. This paper presents results obtained by employing an electroni…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric Peroxide of 1,3-ButadieneC. T. Handy and H. S. RothrockCite this: J. Am. Chem. Soc. 1958, 80, 19, 5306–5308Publication Date (Print):October 1, 1958Publication History Published online1 May 2002Published inissue 1 October 1958https://pubs.acs.org/doi/10.1021/ja01552…
The internal structure of ordinary grey iron, pearlitic ductile iron, ferritic ductile iron, malleable iron and mild steel are compared. Differences in the amount of carbon present and in the form in which it occurs are responsible for some differences in the corrosion behavior of these materials. This is explained on…
It is little more than fifty years since the first manufacture of nitric acid by the oxidation of ammonia over a platinum catalyst. Ostwald’s original industrial plant had an output of some 100 tons of acid a year; today the world capacity for nitric acid manufacture by this process is about ten million tons a year. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganoboron Compounds. VIII. Dihydrobenzoboradiazoles1Robert L. Letsinger and Stephen B. HamiltonCite this: J. Am. Chem. Soc. 1958, 80, 20, 5411–5413Publication Date (Print):October 1, 1958Publication History Published online1 May 2002Published inissue 1 October 1958https://…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTThe Magnetic Properties of the Cobalt Oxide–Alumina SystemJ. T. Richardson and L. W. VernonCite this: J. Phys. Chem. 1958, 62, 10, 1153–1157Publication Date (Print):October 1, 1958Publication History Published online1 May 2002Published inissue 1 October 1958https://pubs.acs.org/…
Very hard and durable single layer antireflection coatings for Ge and Si have been made which result in a peak transmittance of better than 98% at any desired wavelength in the infrared up to about 15μ. Silicon monoxide makes an excellent antireflection coating for silicon and germanium in the near infrared, but canno…
Phase equilibrium studies in the system NaAlSiO ~4~ -KAlSiO ~4~ at subsolidus temperatures have demonstrated that a solvus, or miscibility gap, is present and in a general way it is similar to the solvus between albite and orthoclase. At low temperatures the miscibility gap extends in composition from Na ~3~ KAl ~4~ S…
Molecular order and motion in isotactic and atactic polypropylene molecules have been studied by proton magnetic resonance methods over the temperature range 77–400°K, and by x-ray diffraction. It is shown that some motion persists at the lowest temperatures, and becomes pronounced in the temperature interval 77–110°K…
Employing concepts first applied to textile fibers by Meyer and Lotmar in calculating the elastic stretch modulus of the crystalline domain of cellulose, the moduli of crystalline polyhexamethylene adipamide (α form), and polyethylene terephthalate have been derived. The treatment employs interatomic force constants f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNotes - Base Strengths of Some AlkylhydrazinesRichard HinmanCite this: J. Org. Chem. 1958, 23, 10, 1587–1588Publication Date (Print):October 1, 1958Publication History Published online11 June 2003Published inissue 1 October 1958https://pubs.acs.org/doi/10.1021/jo01104a629htt…
The rate of change of magnetic moment with composition in several ferromagnetic cobalt-rich and iron-rich alloys of these systems has been derived from measurements of the variation of spontaneous magnetization with temperature. The measurements were made on the high-temperature face-centred cubic phase of the cobalt…