Materials Literature
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Abstract Chemical and physical treatments of cotton cellulose have been studied in order to elucidate the relationship between the degree of crystallinity of cellulose and the susceptibility of cellulose to cellulase. Cotton cellulose powder was treated with the following solvents: 60% H 2 SO 4 , Cadoxen, and DMSO‐ p…
The effect of chloride ion on the passivation of nickel is studied and a mechanism for pit initiation on electrodes anodized in Cl − ‐containing solutions is proposed. Although Cl − does not directly influence the nickel dissolution reaction, , it does interfere with formation and thereby retards passivation. This is…
Abstract An approach to the creation of thermotropic cholesterol‐containing liquid crystalline polymers by the chemical binding of cholesterol molecules with side chains of comblike polymers is presented. This type of structure permits a decrease in the steric hindrances provided by the backbone chains for the purpose…
Abstract Clay minerals in the upper 50 cm of sediment that surround the Cu- and Ni-rich manganese nodules in the North Equatorial Pacific form two fractions: terrigenous (mostly eolian) illite, chlorite, and kaolinite, and authigenic smectite. Smectite increases with depth in box cores from 26 to 39% and from 53 to 66…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of iron(III) porphyrins and iodosoxylene. The active oxene complex of cytochrome P-450C. K. Chang and Ming-Shang KuoCite this: J. Am. Chem. Soc. 1979, 101, 12, 3413–3415Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inis…
Molecular dynamics technique is used to study the homogeneous nucleation of an ordered stable phase from a liquidlike state of aggregation. The rubidium potential is used for a 500 particles system with reduced density 0.95. At the start of the calculation the system is quenched rapidly from a reduced temperature of 0…
Abstract The melting behavior of continuous fibrillar crystals of high‐molecular‐weight polyethylene has been investigated. The macrofibers were grown from dilute solutions in xylene subjected to Couette flow in the temperature range between 103 and 118.5°C. The thermograms, as determined by differential scanning calo…
Lead zirconate titanate is a solid solution with nominal composition Pb(ZrxTi1−x)O3. Ferroelectric thin films of this material have been successfully deposited by a focused ion-beam sputtering technique in an O2 atmosphere. These films were characterized according to composition, crystal structure, and dielectric and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTM3L9(ligand) complexesBirgitte E. R. Schilling and Roald HoffmannCite this: J. Am. Chem. Soc. 1979, 101, 13, 3456–3467Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs.acs.org/doi/10.1021/ja00507a006h…
Anisotropy in mechanical properties, expansion coefficients, and long-term shrinkage of PET films was determined. The films ranged in thickness from 0.92 to 14 mils. Young's modulus, ultimate strength, ultimate elongation, and coefficient of thermal expansion were strongly anisotropic. This anisotropy was related to o…
The elastic and piezoelectric constants of trigonal crystals of selenium and tellurium have been determined. Their values were deduced from measurements of ultrasonic phase velocities at room temperature. The stiffnesses cEαβ in units of 1010 N/m2 and the piezoelectric constants eiα in C/m2 for selenium are found to b…
Synopsis A nomenclature is proposed for the alluaudite and wyllieite complex series which is based on sequentially distributing the cations in the cell according to increasing polyhedral size, matching that size with increasing ionic radii of the cations. For oxidized members, the largest site may be partly occupied t…
Phosphoglycerate phosphomutase of Bacillus subtilis, Bacillus cereus and Bacillus megaterium required Mn2+ as cofactor, whereas the wheat germ and rabbit liver enzymes did not. In the absence of Mn2+, B. subtilis did not sporulate in normal sporulation media but it did sporulate if the proper ratio of glucose or glyce…
The preparation of a large number of novel fluorine-containing aluminosilicate glasses is reported along with the properties of cements formed by their reaction to aqueous solutions of poly- (acrylic acid) (PAA).
The hexagonal cell dimensions a and c of 2H-MoS2 and 2H-WSe2 have been measured over the temperature range 10 to 320 K. In both compounds a increased linearly and c non-linearly with temperature, the linear coefficient of thermal expansion in the c direction being greater than that in the a direction for 2H-MoS2. In 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of tetrakis(cyclohexylamine)di-.mu.-hydroxo-dicopper(II) perchlorate. The first example of a roof-shaped hydroxo-bridged copper(II) dimerM. F. Charlot, S. Jeannin, Y. Jeannin, O. Kahn, J. Lucrece-Abaul, and J. Martin-FrereCite this:…
Summary In order to prepare allophane and imogolite in the laboratory, solutions containing l–2× 10 –3 M orthosilicic acid and 4–0.5 × 10 –3 M A1C1 3 (SiO 2 /Al 2 O 3 molar ratio; 0.5, 1.0, 2.0, 4.0 and 8.0) were heated at 95–100°C for 113 hours after addition of NaOH (NaOH/Al molar ratio; 1.0, 2.0, 2.8 and 3.0). Boeh…
This paper describes the effects of frequency, voltage, temperature and mechanical stress on the times to breakdown of XLPE cable insulation subjected to highly divergent fields. Temperature and mechanical stress reduce the times to breakdown but tests with increasing voltage and high frequency produced unexpected res…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of hydrogen absorption by lanthanum-nickel (LaNi5)W. E. Wallace, R. F. Karlicek, and H. ImamuraCite this: J. Phys. Chem. 1979, 83, 13, 1708–1712Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://d…
The progressive development of the α ‐ Al 2 O 3 scale morphology on an Fe‐27% Cr‐4%Al alloy, and similar alloys containing 0.008%, 0.023%, and 0.82%Y, after oxidation in 1 atm oxygen at 1200°C has been investigated. After oxidation for several hours, the oxide present on the yttrium‐free alloy is convoluted and consis…