Les ligno-sulfonates permettent d’accélérer le broyage à l'cau
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Infrared Spectra of High Polymers. III. Polytetrafluoroethylene and Polychlorotrifluoroethylene
The infrared spectra of polytetrafluoroethylene and polychlorotrifluoroethylene have been obtained between 4000 cm—1 and 70 cm—1. Polarization measurements on oriented samples were obtained in the region of 4000 cm—1 to 300 cm—1. It is known from x-ray diffraction studies that both polymers have helical chain configur…
Experimental and theoretical studies of the mica polymorphs
Summary An experimental and theoretical study has been made in order to determine the number and the structure of the possible polymorphs and to determine the structural relations between them. The simplest structures are 1M, 2M 1 , 2M 2 , 3T, 20, and 6H polymorphs, and more complicated types can be developed. Some of…
Kinetic Theory of Liquids.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic Theory of Liquids.Joseph O. HirschfelderCite this: J. Am. Chem. Soc. 1956, 78, 18, 4820Publication Date (Print):September 1, 1956Publication History Published online1 May 2002Published inissue 1 September 1956https://pubs.acs.org/doi/10.1021/ja01599a084https://doi.or…
X-Ray Diffraction Powder Patterns of Calcium Phosphates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Diffraction Powder Patterns of Calcium PhosphatesA. O. McIntosh and W. L. JablonskiCite this: Anal. Chem. 1956, 28, 9, 1424–1427Publication Date (Print):August 21, 1956Publication History Published online1 May 2002Published inissue 21 August 1956https://pubs.acs.org/do…
Cation Distributions in Ferrospinels. Theoretical
The statistical thermodynamics underlying the distribution of cations over the tetrahedral and octahedral sites in ferrospinels is developed. The temperature dependence of the distribution law is analyzed by invoking the Debye approximation for the vibrational spectrum. The resultant equations permit the internal ener…
A Calculation of Physical Constants of Ceramic Barium Titanate
The dielectric, piezoelectric and elastic constants of polycrystalline ceramics at room temperature are calculated by averaging those values of single crystals on the assumption that the ceramic is composed of spherical crystallites. The calculated values are in good agreement with observed ones, showing that the piez…
Cation Distributions in Ferrospinels. Magnesium-Manganese Ferrites
The saturation magnetization as a function of quench temperature is measured for the ferrite system ${\mathrm{Mg}}_{y}{\mathrm{Mn}}_{1\ensuremath{-}y}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$. From these data the ionic distribution of Mg ions is evaluated and compared to the theoretical thermodynamic analysis developed in th…
PROCESSING AND PROPERTIES OF KNITTED STRETCH FABRICS
A general review is made of the methods of manufacture and physical properties of the following types of stretch yarn:—crimped nylon, crinkle, stretch and Ban-Lon. A general description and definitions of the physical properties of fabrics knitted from these yarns are also given. The effect of knitting stiffness (expr…
Some Optical Properties of Zinc Sulfide Phosphors Doubly Activated with Copper and Manganese
Abstract Optical properties of ZnS: (Cu+Mn) phosphors have been extensively studies with the purpose to investigate the phenomena of sensitized luminescence in photoconductive phosphors. Spectra of emission, absorption and axcitation, thermoluminescence and photo-conductivity were measured. It was confirmed from the m…
Studies on carbon black. III. Theory of bound rubber
Abstract On the hypothesis that “bound rubber” is a gel of carbon black particles, the bonding agent of which consists of the longer polymer molecules, a statistical theory is developed. The probability is first computed that a rubber molecule of i segments will be attached to j carbon black particles. By means of thi…
Thermal Conductivity of Germanium and Silicon at Low Temperatures
Measurements are reported of the thermal conductivity, $K$, of high-purity $n$- and $p$-type germanium, and of a single crystal of $n$-type silicon at temperatures between 2 and 150\ifmmode^\circ\else\textdegree\fi{}K. These confirm that in silicon and in annealed germanium the thermal conductivity is limited only by…
Definition and Measurement of Crimp of Textile Fibers
Two fundamental concepts are defined, the effective crimp diameter and the effective wave number. The corresponding figures for these concepts are calculated from the measurements of the width values of the plane projection of a rotating fiber and from the measurements of the crimp ratio. These figures are obtained fo…
C-Axis Electrical Conductivity of Graphite
Small crystals of natural graphite showing no evidence of twinning were found in a sample of marble from the Lead Hill mine (Ticonderoga, New York). They were isolated, handled very carefully to avoid deformation, and their $c$-axis conductivity determined. It was found to be about 2\ifmmode\times\else\texttimes\fi{}$…
Thermal expansion of binary alkali silicate glasses
The thermal expansions of a number of binary lithium, sodium, and potassium silicate glasses are reported over the tempcrature range from room temperature to thcir deformation points. The expans ivities of the glasses increased with increasing alkali oxide concentration. These expansivities were used to calculate dens…
The Effects of Contamination by Vanadium and Sodium Compounds On the Air-Corrosion of Stainless Steel
The acceleration of high temperature corrosive attack on heat-resistance alloys caused by the presence of vanadium compounds is well established. The progressive addition of sodium sulfate to the vanadium contaminant indicates that the most corrosive mixture is approximately 20 percent sodium sulfate—80 percent vanadi…
Rate of Electron Exchange between Cuprous and Cupric Ions in Hydrochloric Acid Solutions by Nuclear Magnetic Resonance
A determination of the Cu63 nuclear resonance line width in concentrated hydrochloric acid solutions containing both cuprous and cupric chloride leads to an evaluation of the bimolecular rate constant k for the electron exchange process Cu+++Cu+→+Cu++Cu++.The experimentally determined value for k is k = 0.5×108 liter/…
Neutron Diffraction Studies on Iron at High Temperatures
Neutron diffraction measurements have been made on iron at a series of elevated temperatures up to about 1000\ifmmode^\circ\else\textdegree\fi{}C to establish the magnetic scattering effects through the Curie temperature and in the $\ensuremath{\gamma}$-phase region. Diffraction patterns obtained for the face-centered…
Degradation of Polyphosphates in Solution. I. Kinetics and Mechanism of the Hydrolysis at Branching Points in Polyphosphate Chains1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDegradation of Polyphosphates in Solution. I. Kinetics and Mechanism of the Hydrolysis at Branching Points in Polyphosphate Chains1Ulrich P. Strauss and Theodore L. TreitlerCite this: J. Am. Chem. Soc. 1956, 78, 15, 3553–3557Publication Date (Print):August 1, 1956Publication…
ADSORPTION OF OXYGEN BY A SILVER CATALYST
An apparatus is described to measure volumetrically the amount of gas adsorbed by a catalyst at constant pressure and at exposure times as short as 0.1 min. The volumes of oxygen adsorbed by a technical silver catalyst at pressures of 200, 400, and 700 mm. and in the temperature range of 180° to 300°C. have been measu…