Materials Literature
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An empirical viscosity vs concentration relation for concentrated polymer solutions is derived in terms of a simple free volume theory, and its applicability is tested with some available data for amorphous polymer+solvent systems. It is found that the derived relation fits well those data over the range of polymer co…
The three elastic moduli of 99.999+% pure copper and their associated internal frictions have been measured at Mc frequencies between 4.2 and 250°K both before and after fast neutron bombardment. The changes produced by the irradiation were used to determine the dislocation contributions to the damping and moduli as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRefractory Metals. Tantalum, Niobium, Molybdenum, Rhenium, and TungstenClifford HampelCite this: Ind. Eng. Chem. 1961, 53, 2, 90–96Publication Date (Print):February 1, 1961Publication History Published online1 May 2002Published inissue 1 February 1961https://pubs.acs.org/doi…
An analysis is made for optimizing the thermal efficiency of a sandwiched thermoelectric device and is coded for a digital computer. For suitable input data, the computer determines the thermocouple design that approximately maximizes the thermal efficiency of the device. A verification of the analysis indicates that…
Abstract The clay mineral attapulgite derives its non-swelling needle-like morphology from its three-dimensional crystal structure. The shape and size of the needles result in unique colloidal properties, especially resistance to high concentrations of electrolytes, and give high surface area, high porosity particles…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Reactions of Potassium Silyl1M. A. Ring and D. M. RitterCite this: J. Am. Chem. Soc. 1961, 83, 4, 802–805Publication Date (Print):February 1, 1961Publication History Published online1 May 2002Published inissue 1 February 1961https://doi.org/10.1021/ja01465a01…
Glass fibers as commercially produced have physical and mechanical properties which differ from those of the massive form of the same glass. When these fibers are subjected to subsequent heat‐treatments, the values of the measured properties tend to return to those of the massive glass. This phenomenon is called compa…
The phase equilibrium diagram for the system La 2 O 3 ‐B 2 O 3 has been determined experimentally. The compounds La 2 O 3 ‐3B 2 O 3 and La 2 O 3 ‐B 2 O 3 melt congruently at 1141°± 5°C. and 1660°± 15°C, respectively. At 1488°± 5°C, La 2 O 3 ‐B 2 O 3 inverts from the aragonite‐type structure to a high‐temperature form.…
Abstract The unit-cell characteristics and structures of sepiolite, ferri-sepiolites (xylotile, mountain wood, gunnbjarnite), loughlinite and palygorskite (attapulgite) and their structural relationships are discussed. The chemical, morphological and thermal properties are explained by their structures. The unit-cell…
Load-deformation curves obtained by the methods for shearing and buckling de scribed in Part I and II are analyzed and discussed. Parameters obtained from these curves are given for 66 commercial fabrics covering an extreme range. Different fabrics show widely different values for the parameters obtained from both she…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTRIPTYCH-SILOXAZOLIDINES: PENTACOORDINATE BRIDGEHEAD SILANES RESULTING FROM TRANSANNULAR INTERACTION OF NITROGEN AND SILICONCecil L. Frve, George E. Vogel, and James A. HallCite this: J. Am. Chem. Soc. 1961, 83, 4, 996–997Publication Date (Print):February 1, 1961Publication…
The problem considered is the behavior of a gas bubble in a liquid saturated with dissolved gas when oscillating pressures are imposed on the system. This situation is encountered in experiments on cavitation and in the propagation of sonic and ultrasonic waves in liquids. Since gas diffuses into the bubble during the…
The spin-lattice relaxation time of Ce 3+ in cerium magnesium nitrate has been measured as a function of temperature and of magnetic fields up to 1000 gauss. In the temperature range between 3° and 1.9°K, the relaxation time is found to vary exponentially with inverse temperature, changing by a factor of 350. A theore…
Epoxy embedding methods of Glauert and Kushida have been modified so as to yield rapid, reproducible, and convenient embedding methods for electron microscopy. The sections are robust and tissue damage is less than with methacrylate embedding.
I. Crystal Surfaces in Equilibrium with the Surrounding Medium 117 The Surface Energy of Crystals 117 1. Kinks in Elementary Steps 117 2. Crystal Surface Energy. Herring's Formula 118 3. Corner Points in the Profiles of Crystal Surfaces 119 4. Surface Stability Conditions 120 5. The Equilibrium Shape of an Open Curve…
Abstract The spin-independent properties of an electronic system are completely determined by spinless density functions, P1(1; 1') and P 2( 1,2; 1',2 '), derived from the 1-and 2-electron density matrices, p1(1; 1') and p2(1,2 ; 1',2'). These functions, and their physical inter-pretation, have been dealt with in par…
The transmission (${\ensuremath{\eta}}_{T}$) of electrons through thin films of C, ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, Al, Ni, Ag, and Au, together with their distribution in angle and energy, were measured in a spherical retarding-potential analyzer. The distributions were characterized by average and most probabl…
The Hall mobility of carriers in photoconducting insulators can be varied over an appreciable range by the effects of photoexcitation. Such a variation can result either (1) from a change in the density of scattering centers as the result of a change in the occupation of imperfection centers, or (2) from the initiatio…
Measurements have been made of the growth of the $F$ band in undeformed, deformed, and heat-treated KCl crystals at room temperature using 140-kvp x-ray irradiation. The growth curves were analyzed in terms of the initial concentration of negative-ion vacancies in the lattice before irradiation, rate of formation of n…
The relative optical absorption coefficient $\ensuremath{\alpha}$ of polycrystalline slabs of cuprous oxide was measured at 295\ifmmode^\circ\else\textdegree\fi{}K, 77\ifmmode^\circ\else\textdegree\fi{}K, and 4.2\ifmmode^\circ\else\textdegree\fi{}K. At 4.2\ifmmode^\circ\else\textdegree\fi{}K, $\ensuremath{\alpha}$ is…