Materials Literature
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Abstract The relationship between two anharmonic physical properties is considered: the bulk‐modulus temperature dependence (1/ B ) (∂ B /∂ T ) and the thermal expansivity (1/ V ) (∂ V /∂ T ). For the first, Varshni's relationship is used, which derives from an Einstein‐oscillator model of crystals. For the second, a…
Growth conditions for Bi1−xLnxFeO3 (Ln˭La, Nd, Sm, Gd, Dy) crystals have been determined. Polymorphism, polar and magnetic properties of several structures have been studied. The quadratic magnetoelectric effect is found in rhombohedra1 and triclinic crystals with x < 0.25. The linear magnetoelectric effect is observe…
Plant fibers have a strength per unit weight similar to those of man-made fibers. Although plant fibers are successfully used in a limited number of composite products at the moment, the advantages of plant fibers, and the diverse fiber properties provided by nature, are such that plant fibers are likely to become mor…
The surface of polyimide film, Kapton® H, was modified with Ar, N2, NO, NO2, O2, CO, and CO2 plasmas to improve its adhesion to evaporated copper. The plasma treatments led to bond scission of the imide groups in the Kapton film to form carboxyl and secondary amide groups, and, as a result, the surface of the Kapton f…
Abstract Dielectric properties of grown single crystals of Na 2 SbF 5 and Na 3 Sb 2 F 9 have been carried out. The values of the dielectric constant of Na 2 SbF 5 and Na 3 Sb 2 F 9 are about 24.1 and 14.3, respectively, at temperatures from 30 °C to 250 °C and 225 °C for 100 kHz.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(orgnaophosphazenes) with glycolic acid ester and lactic acid ester side groups: prototypes for new bioerodible polymersHarry R. Allcock, Shawn R. Pucher, and Angelo G. ScopelianosCite this: Macromolecules 1994, 27, 1, 1–4Publication Date (Print):January 1,…
Using a simple electronic method for measuring wicking times, we have shown that horizontal wicking of liquids into continuous filament yarns follows the Lucas-Wash burn equation. We have investigated the effects of the liquid properties, viscosity, and surface tension, and of the liquid-solid interaction parameter co…
New dendrimeric organoplatinum complexes have been prepared by oxidative addition of precursors containing a dimethylplatinum(II) centre to 1,2,4,5-tetrakis(bromomethyl)benzene; the products include a Pt28 complex which is believed to be the largest reported transition-metal dendrimer.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange through hydrogen bonds: structural and magnetic characterization of cis-hydroxoaquachromium(III) complexes of tetradentate and monodentate ligandsP. A. Goodson, J. Glerup, D. J. Hodgson, K. Michelsen, and U. RychlewskaCite this: Inorg. Chem. 1994, 33, 2, 35…
A new method for the reduction of chemical kinetic detailed mechanisms is presented. It is based on atomic fluxes calculations and reaction pathways analyses. The method was applied to a CH4/O2/Nx2 comprehensive combustion mechanism, including NOx reactions, previously validated for several types of experiments (flow…
The monolayer and LB film-forming properties of 20 structurally related amphiphilic octa-substituted phthalocyanine derivatives have been assessed. The molecular packing within examples of the films has been probed by visible-region spectroscopy and low-angle X-ray diffraction methods. Among derivatives where the alip…
Using acid–base-type doping of polyaniline with H3PMo12O40, two series of catalyst samples were prepared. In series Sl the doping and polymerization were carried out simultaneously, leading to a uniform distribution of the dopant over the whole volume of the polymer. In series SII the doping was achieved by protonatio…
It is shown experimentally that the ketene dithioacetal group is very effective as an electron-donating group in the design and synthesis of thermally stable and efficient second-order nonlinear optical chromophores.
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Grain protein films plasticized with glycerol were prepared from corn zein (CZ), wheat gluten (WG), and a 2.3:1 mixture of wheat gluten and soy protein isolate (WG/SPI). Moisture adsorption curves of the three types of protein films at 25 C and within an approximate water activity range of 0.11 to 0.84 were obtained u…
Thiophene oligomers having a dithienylethene structure show large shifts in oxidation potential to the cathodic region in excess of 0.87–1.27 V by photocyclization.
Al-Pillared saponites have been prepared from natural Na-exchanged Ballarat saponite. Acidic properties of these saponites have been studied by IR spectroscopy using pyridine as a probe molecule. Al-Pillared saponites exhibit both Brønsted and Lewis acidity. Lewis sites are evidenced in the parent Na-exchanged clay as…
Abstract Models describing thermal motion and conformational variability in protein crystal structures were applied to the refinement of a 1.8 Å crystal structure of penicillopepsin. Three methods were tested: conventional refinement using restrained B factors, multiple‐conformer refinement, and time‐averaging refinem…
Unsymmetrically substituted triphenylenes can be obtained by the iron(III) chloride mediated oxidative coupling of a 3,3′,4,4′-tetraalkoxybiphenyl with a 1,2-dialkoxybenzene thus opening up a practicable route to polymeric discotic liquid crystals.
Chemical oxidation of aniline at the liquid/liquid interface of two immiscible solvents results in the growth of an electroactive polymer membrane that exhibits redox behaviour similar to conventional electrodeposited polyaniline.