X-ray structure of the polyaniline derivative poly(o-toluidine): the structural origin of charge localization
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Theory of the General Deformation of Fiber Assemblies
A theory based on an energy method is proposed for the mechanics of a fiber mass under general deformation, including compression, extension, and shearing. The mass , is treated as a network composed of many fiber segments, each bounded by two neigh boring fiber contact points, and the individual mechanical behaviors…
First-principles study of phase transitions in KNO 3
We report a first-principles simulation study of phase transitions in ${\mathrm{KNO}}_{3}$, using our recently developed method for treating ionic molecular solids. With the interionic potentials calculated from ab initio electron charge densities of the ions, our structural static relaxation gave close fits to both t…
Regulation of levels of purine biosynthetic enzymes in Bacillus subtilis: effects of changing purine nucleotide pools
The genes encoding the enzymes of IMP biosynthesis in Bacillus subtilis constitute the pur operon, whereas the genes encoding GMP biosynthetic enzymes, guaA (GMP synthetase) and guaB (IMP dehydrogenase), and the purA gene encoding adenylosuccinate (sAMP) synthetase all occur as single units. The purB gene encodes an e…
Physical behaviour of CdO films prepared by activated reactive evaporation
High transparent and conductive CdO films were prepared using the activated reactive evaporation technique on Corning 7059 glass substrates. The film resistivity and transmittance were found to be influenced by the glow power of the discharge. Electron mobilities of 4-28 cm 2 V -1 s -1 and carrier density in the range…
Structure-Composition Relationships in Trioctahedral Chlorites: A Vibrational Spectroscopy Study
Abstract Raman and Fourier-transformed infrared spectra of natural trioctahedral chlorites of polytype IIb were obtained for a series of samples characterized by distinct Fe/(Fe + Mg) and Si/Al ratios ranging, respectively, from 0.04 to 0.94 and from 5.18 to 1.86. All samples were characterized by X-ray powder diffrac…
The first gold(III) macrocyclic polyamine complexes and application to selective gold(III) uptake
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe first gold(III) macrocyclic polyamine complexes and application to selective gold(III) uptakeEiichi Kimura, Yasuhisa Kurogi, and Toshikazu TakahashiCite this: Inorg. Chem. 1991, 30, 22, 4117–4121Publication Date (Print):October 1, 1991Publication History Published online…
Effects of environmental factors on the electrooptical properties of conjugated polymers containing oligo(oxyethylene) substituents
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of environmental factors on the electrooptical properties of conjugated polymers containing oligo(oxyethylene) substituentsJean Roncali, Li Hong Shi, and Francis GarnierCite this: J. Phys. Chem. 1991, 95, 22, 8983–8989Publication Date (Print):October 1, 1991Publicati…
Conformational characteristics of the polycarbonate of 4,4'-isopropylidenediphenol
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational characteristics of the polycarbonate of 4,4'-isopropylidenediphenolM. Hutnik, A. S. Argon, and U. W. SuterCite this: Macromolecules 1991, 24, 22, 5956–5961Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1…
Electrochemical Characterization of Electronically Conductive Polypyrrole on Cyclic Voltammograms
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…
The “JOERS/Alvey” ferroelectric multiplexing scheme
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…
Chemical Characterization, Structural Features, and Thermal Behavior of Sodium and Hydrogen Octosilicate
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…
Reexamination of the role of Asp20 in catalysis by bacteriophage T4 lysozyme
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…
Regeneration of spent activated carbon by wet air oxidation
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…
Polymers of carbonic acid, 6. Polymerization of trimethylene carbonate (1,3‐dioxan‐2‐one) with complexation catalysts
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…
Free polymer in a colloidal solution
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…
High‐Temperature Compressive Creep of Polycrystalline Mullite
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…
An atomistic model of the amorphous glassy polycarbonate of 4,4-isopropylidenediphenol
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…
Transitions between mesophases involving cubic phases in the surfactant-water systems. Epitaxial relations and their consequences in a geometrical framework
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…
Electrochemical measurements of electron transfer rates through zirconium 1,2-ethanediylbis(phosphonate) multilayer films on gold electrodes
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…