Materials Literature
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Abstract The rate of oxidation of thin films of polybutadiene have been studied between 50 and 90°C. The films were prepared directly from latex by dipping, and thoroughly purified. The oxidation rates were found to go through an induction period, to accelerate rapidly to a maximum, and then to decrease to low values.…
All but one of the multiple ferromagnetic resonances observed by White and Solt in a sphere are shown to correspond to modes in which the oscillating part of the magnetization is independent of $r$ (the only case ordinarily considered) or varies linearly with $r$ in the sample.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Formation of Pyridoxal and Pyridoxal 5-Phosphate Hydrazones1Ronald G. WiegandCite this: J. Am. Chem. Soc. 1956, 78, 20, 5307–5309Publication Date (Print):October 1, 1956Publication History Published online1 May 2002Published inissue 1 October 1956https://pubs.acs.org/doi…
For the normal heavy-atom method of solving crystal structures the Fourier series, whose coefficients are given in moduli by the observed intensities and in phase by the heavy-atom contribution, is summed. It is shown that a Fourier series with coefficients quite different from these shows the unknown part of the stru…
Ferromagnetic resonance in ferrites is reviewed. The concept of tensor permeability, the influence of magnetic anisotropy, demagnetizing fields, and damping mechanisms are discussed. Special consideration is given to coupled magnetic systems and the behavior in ferrites with compensation points. The general theoretica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Quantitative Evaluation of the Effect of Hydrogen Bonding on the Strength of Dibasic AcidsF. H. Westheimer and O. T. BenfeyCite this: J. Am. Chem. Soc. 1956, 78, 20, 5309–5311Publication Date (Print):October 1, 1956Publication History Published online1 May 2002Published…
Abstract The adsorption of zinc chloride on calcite, dolomite and Casubstituted magnesite crystals from aqueous solution is treated theoretically; and a standard adsorption process is thereby rigorously defined. The thermodynamic characteristics Δ F 0 θ, Δ H 0 θ and Δ S 0 θ are determined for this process by means of…
A theory is developed of the continuous radiation spectrum which accompanies nuclear capture of atomic electrons. It is shown that quantitative predictions of the spectrum intensities must take into account the influence of the electrostatic field of the nucleus on the radiation process. This is accomplished by evalua…
A review of the properties, applications, and engineering significance of ferrites below microwave frequencies is presented. The survey includes a discussion of the nature of ferrites, their magnetic and electrical properties, the use of the μQ product as a design index of efficiency, core losses, and the effects of a…
Abstract The reaction of cellulose, cellobiose, and their acetyl derivatives with trifluoroacetic acid has been studied by the method of infrared spectrophotometry. Changes in optical density were measured at 25°C. as a function of time. Band assignments are adequate for the present study, although some uncertainties…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of Formation of Sodium Molybdate, Molybdic Acid and Aqueous Molybdate IonRobert L. Graham and Loren G. HeplerCite this: J. Am. Chem. Soc. 1956, 78, 19, 4846–4848Publication Date (Print):October 1, 1956Publication History Published online1 May 2002Published inissue 1 Oc…
The activation energy of creep was determined for a series of tin single crystals oriented with the specimen axis close to a [110] direction. Two activation energies were found. A value of approximately 22 000 cal/m was obtained for temperatures above 130°C; a value of about 11 000 cal/mole for temperatures below 130°…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Dissociation Pressure of Calcium CarbonateK. J. Hill and E. R. S. WinterCite this: J. Phys. Chem. 1956, 60, 10, 1361–1362Publication Date (Print):October 1, 1956Publication History Published online1 May 2002Published inissue 1 October 1956https://pubs.acs.org/doi/10.…
Boron nitride can be excited to luminesce by (1) alternating electric fields, (2) ultraviolet photons, or (3) cathode rays. The luminescence, in all cases, has a complex emission spectrum, extending from approximately 2950 A to 6500 A. The relative intensities of the bands in the fine structure are affected by current…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of the Hydroformylation Reaction. The Effect of Olefin Structure on Rate1Irving Wender, Sol Metlin, Sabri Ergun, Heinz W. Sternberg, and Harold GreenfieldCite this: J. Am. Chem. Soc. 1956, 78, 20, 5401–5405Publication Date (Print):October 1, 1956Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuadridentate and Sexadentate Chelates. Some Preliminary Studies in their Preparation and Thermal Stability1C. S. Marvel, S. Alan Aspey, and Edward A. DudleyCite this: J. Am. Chem. Soc. 1956, 78, 19, 4905–4909Publication Date (Print):October 1, 1956Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLower Oxides of Samarium and Europium. The Preparation and Crystal Structure of SmO0.4-0.6, SmO and EuO1H. A. Eick, N. C. Baenziger, and L. EyringCite this: J. Am. Chem. Soc. 1956, 78, 20, 5147–5149Publication Date (Print):October 1, 1956Publication History Published online1…
The sintering (densification) and grain growth of alumina were studied to determine the effect of the variables raw material, particle size, grinding in acid media, molding pressure, various single additives in different amounts, and firing temperature. Fine grinding promoted sintering and the growth of large grains a…
The total surface energies (or, more strictly, surface enthalpies) of amorphous silica and hydrous amorphous silica were determined by measuring the heats of solution in a mixture of nitric acid and hydrofluoric acid of samples having differing specific surface areas and bound water contents, and by measuring the surf…