Materials Literature
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Experimental and theoretical cyclic voltammograms for electronically conducting polypyrrole film are obtained from the identical conditions and compared to each other to characterize electrochemical behavior of the polymer. A comparison of the simulated and experimental cyclic yoltammograms shows quantitative agreemen…
Ferroelectric liquid crystal displays offer an attractive matrix addressed alternative for complex displays. However, their potential can only be realised by using novel addressing schemes suitable for the fast responding, DC sensitive, ferroelectric electro-optic effect. Over a period of several years, a high perform…
Abstract The chemical composition and the thermal behavior of sodium and hydrogen octosilicate was studied by chemical and thermal analysis, infrared (IR), magic-angle-spinning nuclear magnetic resonance (MAS-NMR) spectroscopy, and X-ray diffractometry. Both compounds are layer silicates with basal spacings of 11.10 a…
Replacement of Asp20 in T4 lysozyme by Cys produces a variant with (1) nearly wild-type specific activity, (2) a newly acquired sensitivity to thiol-modifying reagents, and (3) a pH-activity profile that is very similar to that of the wild-type enzyme. These results indicate that the residue at position 20 has a signi…
Abstract The regeneration of activated carbon was studied using the wet air oxidation process in the temperature range of 150–240°C and oxygen partial pressure range of 0.2 to 1.0 MPa. Phenol was used as substrate. The overall mechanism of regeneration has been analysed and the different steps taking place during the…
Abstract Numerous bulk polymerizations of trimethylene carbonate (1,3‐dioxan‐2‐one, 2 ) were conducted at 90, 120 and 150°C. Tributyltin methoxide, tributyltin acetate, dibutyltin dibromide, tin(II) 2‐ethylhexanotate, bismuth(III) 2‐ethylhexanoate and zinc stearate were used as initiators. On the basis of GPC measurem…
We provide a statistical-mechanical theory for a system of free polymer molecules in a colloidal solution. It is shown that three-body terms are required to obtain the shape of the polymer and the depletion-layer profile even when the dispersion medium is a good solvent for the polymer molecule. A semiquantitative ana…
Aluminosilicates of three compositions with mullite as the major phase were synthesized by a sol‐gel process and characterized with bulk and microchemical analyses and microstructural observation. An apparatus for measuring the compressive creep up to 1900 K with a sensitivity of ±1 μm was constructed and used to meas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn atomistic model of the amorphous glassy polycarbonate of 4,4-isopropylidenediphenolM. Hutnik, F. T. Gentile, P. J. Ludovice, U. W. Suter, and A. S. ArgonCite this: Macromolecules 1991, 24, 22, 5962–5969Publication Date (Print):October 1, 1991Publication History Published…
In order to approach the fascinating structure of the cubic mesophases, we study phase transitions involving them and another mesophases with simpler structures. In the first part, we give some results obtained in the C12EO6/water binary system, that exhibits the most frequent case of bicontinuous cubic mesophase, wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical measurements of electron transfer rates through zirconium 1,2-ethanediylbis(phosphonate) multilayer films on gold electrodesHun Gi Hong and Thomas E. MalloukCite this: Langmuir 1991, 7, 10, 2362–2369Publication Date (Print):October 1, 1991Publication History…
Iontophoresis with gold, carbon, and platinum electrodes was shown to effectively reduce or eliminate gram-positive, gram-negative, and Candida albicans inocula in synthetic urine. Platinum and gold electrodes were more effective than carbon electrodes, but platinum showed the best longevity and may reduce or eliminat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIridescent phenomena and polymerization behaviors of amphiphilic monomers in lamellar liquid crystalline phaseKouichi Naitoh, Yasuo Ishii, and Kaoru TsujiiCite this: J. Phys. Chem. 1991, 95, 20, 7915–7918Publication Date (Print):October 1, 1991Publication History Published o…
The di-, tri-, and hexavacant lacunary tungstoarsenates α-[HAs 2 W 16 O 59 ] 11− , α-[As 2 W 15 O 56 ] 12− , and α-[H 2 As 2 W 12 O 48 ] 12− were prepared by controlled alkaline degradation of the Dawson-type anion α-[As 2 W 18 O 62 ] 6− . The relationships between all these anions and the two α-[As 2 W 17 O 61 ] 10−…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of poly(quinolinediyl)s and poly(isoquinoline-1,4-diyl) with new π-conjugation systemsTakaki Kanbara, Nobuo Saito, Takakazu Yamamoto, and Kenji KubotaCite this: Macromolecules 1991, 24, 21, 5883–5885Publication Date (Print):October 1, 1991Publicati…
Observations with the polarizing microscope of defects in the lyotropic Lα(SmA) phase of the quasi-ternary system cetylpiridinium chloride/hexanol/brine give evidence that oily streaks are chains of focal conic domains. The chains are stable in the vicinity of the Lα-L3 phase transition. Such a model of oily streaks w…
Pyrolysis of preceramic polymer/metal powder composites resulted in formation of ceramic products containing the metal as well as element present in the polymer. Prepared in this manner were ceramics containing crystalline phases of metal silicides, metal carbides, metal nitrides, metal borides, and silicon carbide. T…
The interaction of ½<110> screw and 60° dislocations with symmetric [110] tilt boundaries was investigated by atomistic simulations using many-body potentials representing a pure f.c.c. metal and ordered intermetallic compounds. The calculations were performed with and without an applied shear stress. The observations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA versatile transformation of vic-diols into .alpha.-hydroxy ketones with hydrogen peroxide catalyzed by peroxotungstophosphatesYasuyuki Sakata and Yasutaka IshiiCite this: J. Org. Chem. 1991, 56, 21, 6233–6235Publication Date (Print):October 1, 1991Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRoles of surface protonation on the photodynamic, catalytic, and other properties of polyoxometalates probed by the photochemical functionalization of alkanes. Implications for irradiated semiconductor metal oxidesRoman F. Renneke, Miryam Kadkhodayan, Marzia Pasquali, and Cr…