Materials Literature
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Infrared absorption by a mineral arises from the vibrations of its constituent atoms, and the frequencies of these vibrations are dependent on the mass of the atoms, the restraining forces of the bonds, and the geometry of the structure. The resultant spectrum of absorption frequencies is a characteristic property of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerfluoroalkylsilver compoundsWilliam Taylor Miller Jr. and Robert J. BurnardCite this: J. Am. Chem. Soc. 1968, 90, 26, 7367–7368Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Published inissue 1 December 1968https://pubs.acs.org/doi/1…
Abstract An application of TGA technique to elucidate the chain reaction mechanism of cellulose pyrolysis is discussed. The mathematical expressions for isothermal kinetics are modified for use with temperature‐programmed kinetics. It is shown that in temperature‐programmed kinetics, the initial reaction should theore…
The very complicated formulae which relate the components of the complex refractive index of a thin film to the measurable optical reflection and transmission coefficients have been put into a much simpler form. This greatly simplifies the programming for a computer solution of the equations, and also leads to some us…
The author's 1962 treatment of the surface structure of water and ice is reconsidered in the light of new theoretical information on the quadrupole moment of the water molecule and on the structure of liquid water. Electrostatic effects are explicitly taken into account and it is concluded that the principal mechanism…
In this paper we analyze the high-field magnetization of Néel ferrimagnets and apply this analysis to our measurements of YbIG and DyIG. We show that in some ferrimagnetic systems, as the temperature is increased at fixed field strength, the magnetization can decrease in one temperature interval, be temperature indepe…
A simple scanning transmission electron microscope has been built using a field-emission electron source, a new electron gun, and one lens to produce a high-contrast picture with 30 Å resolution. The final spot size is limited by the properties of the lens, in the same manner as a conventional transmission microscope.…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalibration of the methanol and glycol nuclear magnetic resonance thermometers with a static thermistor probeAnthony L. Van GeetCite this: Anal. Chem. 1968, 40, 14, 2227–2229Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Published inis…
Abstract Es wird gezeigt, wie aus Messungen der Winkelabhängigkeit der Linienbreite in Röntgenweitwinkeldiagrammen von Hochpolymeren die kristallitgröße und die Gitterstörungen bestimmt werden können. In lösungskristallisierten linearen Polyäthylenen treten rein parakristalline Gitterstörungen auf, die thermodynamisch…
Abstract The transport behavior of a number of permanent gases of varying molecular size and of water vapor was studied in calendered films of unplasticized poly(vinylchloride). Permeabilities, diffusivities, and solubilities were measured over a range of temperatures traversing the glass transition. A discrete change…
Abstract The morphology and growth of extended chain crystals of polyethylene is discussed on the basis of optical and electron microscopy. The spherulitic habit is shown to be caused by nucleation of new lamellae on the (001) surface of lamellae, branching of lamellae on their growth face, and thickening of lamellae.…
Abstract In order to elucidate the relationship between IR‐spectra and the sequence lengths of the segments which assume the regular helical conformation in isotactic polymer chains, the IR‐spectra have been measured for isotactic copolymers of normal and deuterated styrenes in various ratios. The absorption intensiti…