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The lattice vibrations of a layer compound having the MoS2 structure are derived using the Born-von Kármán model in the nearest-neighbours approximation for single layers. The analysis produces a set of secular equations which are solved around the Brillouin zone; the corner of the zone yields particularly interesting…
At 20°C and for all moisture contents, the mechanical behavior of wool fibers up to 1% extension in the Hookean region is linear viscoelastic. The equilibrium Young's modulus, based on the wet cross-sectional area of the wool fiber, is inde pendent of moisture content and is equal to 1.4X 10 10 dynes-cm 2 . The dynami…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-precision viscosity of supercooled water and analysis of the extended range temperature coefficientBruno J. Zwolinski and Lawrence D. EicherCite this: J. Phys. Chem. 1971, 75, 13, 2016–2024Publication Date (Print):June 1, 1971Publication History Published online1 May 20…
Abstract The relations between generation, glide, and annihilation of dislocations during plastic deformation are represented in terms of control theory. It is inferred that the rate of steady‐state deformation is proportional to the rate of dislocation annihilation and that annihilation is even rate‐controlling at le…
Proteins have been coupled to insoluble polysaccharides following periodate oxidation to produce reactive aldehyde groups which will react with side chain amino groups of proteins. The coupling is stabilized and unreacted aldehydes blocked, by reduction with sodium borohydride.
Abstract Corona treatment of low‐density polyethylene in oxygen or oxygen‐containing gases produced bumps on the surface, while treatment in nitrogen, hydrogen, argon, or helium caused no detectable surface change. Bumps made by an oxygen corona increased in size with time and temperature of the treatment. The bumps w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and chemistry of the porphyrins. Crystal and molecular structure of the monohydrated dipyridinated magnesium phthalocyanine complexDavid H. Templeton, Mark S. Fischer, Allan Zalkin, and Melvin CalvinCite this: J. Am. Chem. Soc. 1971, 93, 11, 2622–2628Publication Da…
Deposition of atomic beams of potassium and rubidium with oxygen molecules at high dilution in argon together on a salt window at 15°K produces the KO2 and RbO2 molecules, as identified by infrared spectra. Secondary reaction yields the KO2K and RbO2Rb molecules. Oxygen isotopic mixtures and simultaneous deposition of…
The critical field strength at which a classical domain wall moves through a perfect ferromagnetic crystal of simplified structure is calculated as a function of the ratio between anisotropy energyKand ferromagnetic coupling energyC, taking into account the discrete nature of the spins. WhenKapproachesCintrinsic wall…
The homopolymers poly(methyl methacrylate) and poly(ethyl methacrylate) are compatible with poly(vinylidene fluoride) when blended in the melt. True molecular compatibility is indicated by their transparency and a single, intermediate glass transition temperature for the blends. The T g results indicate plasticization…
The Monte Carlo technique using a simple single scattering model, different from Reimer's, is applied to the field of the Electron Probe Microanalyzer (EPMA) and the Scanning Electron Microscope (SEM). The calculations show fairly good agreement with the experiments on back-scattered electrons, energy dissipation, cha…
We develop a theory, valid for large friction, for the rate of conformational (rotational isomeric state) transitions in polymers. Such changes are classified according to the effect which the transformation in a finite portion of the molecule has on the attached polymeric chains. Major consideration is given to type…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlue solutions of sulfur in salt meltsW. GiggenbachCite this: Inorg. Chem. 1971, 10, 6, 1308–1311Publication Date (Print):June 1, 1971Publication History Published online1 May 2002Published inissue 1 June 1971https://pubs.acs.org/doi/10.1021/ic50100a044https://doi.org/10.102…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFree-radical molecular complexes. II. Boron halides and aluminum chlorideBrian Mark Hoffman and Thomas B. EamesCite this: J. Am. Chem. Soc. 1971, 93, 13, 3141–3146Publication Date (Print):June 1, 1971Publication History Published online1 May 2002Published inissue 1 June 1971…
Abstract The i.r. spectra of interlamellar kaolinite complexes with formamide, N-methylformamide and dimethylformamide have been examined. The spectra show that the amides hydrogen-bond, through the C=O group of the amide to the inner surface kaolinite hydroxyls and decrease the intensity of the kaolinite ν (OH) bands…
Abstract The optical absorption spectra of trivalent thulium in single crystals of YVO 4 and YPO 4 were measured in the range from 5000 to 29000 cm −1 including the Zeeman effect at 85, 4.2, and 2K. Furthermore the fluorescence spectrum in YVO 4 between 19000 and 25000 cm −1 was investigated. Some special features of…
The effect of pressure to 175 kbar has been measured on the spin state of Fe(II) in bis- and trisphenanthroline complexes, using Mössbauer resonance and optical absorption. The bis complexes can be classified according to the degree of back bonding to the nonphenanthroline ligands. Compounds with halide ligands are hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding, solvent polarity, and the visible spectrum of phenol blue and its derivativativesJ. FiguerasCite this: J. Am. Chem. Soc. 1971, 93, 13, 3255–3263Publication Date (Print):June 1, 1971Publication History Published online1 May 2002Published inissue 1 June 1971h…
Physical, electrical, and optical properties of selected compositions within the lead lanthanum zirconate‐titanate (PLZT) system are presented, including chemically and thermally etched microstructures, examples of residual porosity defects, temperature dependence of remanent polarization and coercive field, lateral s…
The binding states, adsorbate densities, and desorption kinetics of hydrogen on the (110), (111), and (100) crystal planes of tungsten are examined. There are two atomic states on the (110) plane and four atomic states on the (111) plane. Saturation hydrogen densities are approximately equal in the major states on bot…