Materials Literature
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Neutron diffraction measurements were made on single crystals of KCN to obtain information about the disorder of the CN− ions in the cubic phase. The crystals were obtained by pulling from the melt by a modified Czochralski method. Data were collected on two four-circle diffractometers at room temperature and at 180°K…
Abstract By using the carbon‐13 NMR technique, it is shown that there are no cis ‐1,4– trans ‐1,4 linkages in a n ‐BuLi‐catalyzed polybutadiene. The polymer consists of “blocks” of cis ‐1,4 units and trans ‐1,4 units separated by isolated vinyl units. Preliminary evidence suggests this might also be true for other typ…
The optical properties of a thin film of liquid crystal, with one of its surfaces bounded by the isotropic liquid of the same compound, reveal the existence of point defects in the liquid crystal. Particular sample geometries are examined in which the detailed structure of the optical patterns seen with polarized ligh…
Abstract The surface oxidation of polypropylene films which occurs during ultraviolet irradiation in air was found to result in extensive surface restructuring. This restructuring was detected by changes in surface infrared spectra, as measured by attenuated total reflection spectroscopy, and by electron microscopy. T…
Abstract Polarized luminescence is observed for In ++ (h v m I = 2.12 eV) and In ++ v (h v m I = 1.75eV) centres in X‐irradiated KCl:In. Spectral and polarization characteristics of the luminescence are investigated. The symmetry of excited In ++ centres is established to be tetragonal. The energy level diagram and th…
Centrifuge measurements and electrostatic charge measurements have shown that the force of adhesion of xerographic toner particles to carrier beads can be described by an electrostatic model. In this model the triboelectric charge on the toner particle is attracted by its countercharge residing on the bead surface and…
Abstract The trapping of holes by In + and In + v centres in KCl:In is found to be accompanied by luminescence of the same spectral composition as the emission spectra of In ++ and In ++ v centres, respectively. The processes of migration and trapping are investigated for holes thermally or optically released from In…
Abstract The excitation of the Cs‐5p core level in Cs halides which starts a t about 13 eV was studied by measuring the reflection spectra of evaporated films between 12.5 and 26 eV at room temperature and a t 30 K. Synchrotron radiation was used as a light source. In comparison to the spectra at room temperature new…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorine-19 nuclear magnetic resonance study of the binding of trifluoroacetylglucosamine oligomers to lysozymeF. Millett and M. A. RafteryCite this: Biochemistry 1972, 11, 9, 1639–1643Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Publis…
Nuclear magnetic resonance measurements of spin-lattice relaxation time and resonance line shapes have been carried out as a function of temperature in the range 77–715°K for 1H contained in yttrium hydride. The composition ranged from YH2.61 to YH2.94 and included three samples in the hydrogen-deficient trihydride ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis in organosilicon chemistry. III. Catalytic mode, solvent isotope effets, and transition-state structure in hydride expulsion from siliconKathleen O'Donnell, Rhonda Bacon, K. L. Chellappa, Richard L. Schowen, and J. K. LeeCite this: J. Am. Chem. Soc. 1972, 94, 7, 25…
Abstract An unsaturated polyester resin and the styrene‐crosslinked polyester were studied with laser Raman spectroscopy. Following the polyesterification reaction, Raman measurements showed that the polyester contained 55% fumarate and 45% maleate unsaturation. Additionally, the glycol fragment was indicated to exist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of iron and rare-earth polymers of di(2-ethylhexyl)phosphoric acidTakeo Harada, Morton Smutz, and Renato G. BautistaCite this: J. Chem. Eng. Data 1972, 17, 2, 203–204Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Publishe…
The spectra of nickel dissolved in silicate and aluminosilicate glasses with alkali and alkaline‐earth modifiers were studied systematically as functions of composition, annealing and temperature, concentration of Ni 2+ , and redox conditions during melting. Although reducing conditions produced a gray scattering phas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSunliight photochemistry of ferric nitrilotriacetate complexesTrevor Trott, Robbie W. Henwood, and Cooper H. LangfordCite this: Environ. Sci. Technol. 1972, 6, 4, 367–368Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 A…
The piezoelectric constants, the electromechanical coupling factors and the elastic compliance constants of Se-Te alloys are studied by the transmission circuit method and/or the mechanical resonance method. The piezoelectric constants d 11 and d 14 decrease rapidly when the Te concentration increases within the range…
ABSTRACT The flexural rigidity of the large abfrontal cilia of Mytilus has been measured with a flexible glass micro-needle. The same cilium has similar values to the flexural rigidity irrespective of the phases of beat cycle (including the recovery phase) and of the direction of force applied. The values of 3–13 × 10…
This report includes data on high temperature organic crystals, ceramics, and glasses. Additional sections include plastic materials with less heat resistance. (P.S.-PL)
A study has been made of the electrochemical behavior of titanium, nickel, and various titanium-nickel alloys, containing 2, 3.5, 4.5, 28.5, 38, and 98 wt % nickel, in an acidified (pH = 1) 3.5% NaCl solution, both at ambient temperature and at the boiling point. The anodic and cathodic polarization behavior was studi…
The initial susceptibilities of powder dimethylammonium copper (II) chloride (DMACuCl3) and tetramethylammonium nickel (II) chloride (TMANiCl3) have been measured in the ranges 1.7–91 °K and 1.6–79 °K, respectively. DMACuCl3 exhibited deviations from Curie-Weiss behavior below 10 °K. The deviations were not inconsiste…