Electrosynthesis of highly conducting poly(3-methylthiophene) thin films
Poly(3-methylthiophene) thin films with conductivities in the range of 2000 S cm–1 have been prepared by electrochemical polymerization.
Materials Literature
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Ion implantation doping and electrical properties of high‐temperature ladder polymers
Abstract We report the first ion implantation doping studies on high‐temperature ladder polymers and show that insulting films of the benzimidazobenzophenanthroline‐type ladder polymer (BBL) can be doped by boron, argon, and krypton implantation to conductivities as high as 224 S/cm at a dose of 4.0 × 10 16 /cm 2 whil…
Electrochromism of a conducting polypyrrole–phosphotungstate composite electrode
A phosphotungstate-anion (PT)-incorporated polypyrrole (PPy/PT) electrode has been prepared by electrochemical polymerization in water containing both pyrrole and the sodium salt of PT. The PPy/PT electrode showed two redox peaks accompanying electrochromism. The peak at higher potential corresponds to an oxidation–re…
NMR, DSC, DMA, and High Pressure Electrical Conductivity Studies in PPO Complexed with Sodium Perchlorate
Audio frequency electrical conductivity, DSC, DMA, and 23 Na NMR measurements have been carried out on Parel 58 elastomer complexed with sodium perchlorate. [As Parel 58 is primarily poly(propylene oxide), it will be referred to as PPO.] The DSC and DMA measurements yield similar values for which are about 72°C higher…
Physical interpretation of the rheological behaviour of amorphous polymers through the glass transition
The purpose of the present work is to predict, from physical bases, the mechanical behaviour of amorphous polymers resulting from the application of a periodic stress through the glass transition range (a relaxation). A theory of the non elastic deformation is developed from a model of molecular mobility. The amorphou…
Relative phases of electromagnetic waves diffracted by a perfectly conducting rectangular-grooved grating
A complete solution of plane-wave scattering from a groove-corrugated surface of infinite extent for arbitrary incidence is presented. The electromagnetic wave is decomposed into fast and slow modal representation, and the solution is accomplished through the use of the mode-matching method. We solved for the zero-ord…
Two-dimensional system with a quasi-crystalline ground state
Résumé. 2014 Nous étudions les empilements denses de particules avec des interactions qui favorisent la symétrie pentagonale. Ces structures peuvent être obtenues par décoration de pavages de Penrose ou directement par une méthode de coupe et projection. Nous prouvons qu’elles forment l’état fondamental dégénéré, dans…
Complete amino acid sequence of rat liver 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase.
The complete amino acid sequence of 6-phospho-fructo-2-kinase/fructose-2,6-bisphosphatase from rat liver was determined by direct analysis of the S-carboxamidomethyl protein. A complete set of nonoverlapping peptides was produced by cleavage with a combination of cyanogen bromide and specific proteolytic enzymes. The…
Recent developments in solvation and dynamics of the lanthanide(III) ions
Abstract
A unique protease responsible for selective degradation of a yolk protein in Bombyx mori. Purification, characterization, and cleavage profile.
A yolk protein, egg-specific protein, synthesized and accumulated in the developing ovaries of Bombyx mori serves not only as the nutritive source for embryogenesis but also for the reorganization of the yolk system through limited degradation. Using the purified egg-specific protein as a substrate, a protease respons…
Characterization of multilayer coatings by X-ray reflection
Methods to deduce the parameters of a multilayer X-ray mirror from its reflectivity curve are reviewed. Inversion methods are successful for coatings with few layers and give the thickness of each layer and the roughness of each interface. A statistical description of the coating is used for coatings with many layers,…
Evidence of an ordered columnar mesophase in peripherally octa‐n‐alkoxy‐substituted phthalocyanines
Abstract Liquid crystalline phthalocyanines with eight n ‐alkoxy chains have been synthesized and their mesophase structures determined by X‐ray diffraction. The mesophases appear to be of the D ho type. Reasons for the preference of ordered columns are discussed.
Self-assembling monolayers in the construction of planned supramolecular suctures and as modifiers of surface properties
Organized monolayer structures prepared on polar solids via spontaneous adsoption from organic solutions (self-assembly) exhibit some rather unique features, particularly relevant with regard to possible technological applications of such systems.
Dislocation pattern formation in metals
A homogeneous dislocation distribution in deformed metals is unstable with respect to clustering of dislocation dipoles. The main reason for formation of the dislocation clusters is a net dipole drift to stress concentrations created by glide dislocations in a applied stress state. Linear stability analysis indicates…
Fundamental questions in the theory of electromigration
The theory of electromigration is focused on the force acting on a lattice defect in a metallic sample that carries an electric current. Much work has been done to obtain a better understanding of the underlying physical mechanisms. The force has been calculated numerically for defects in several metals, and a qualita…
Preparation of silica gel-bound macrocycles and their cation-binding properties
Values of log K for the association of several metal cations with 15-crown-5, 18-crown-6, and N,N′-dibenzyldiaza-18-crown-6, each covalently bonded to silica gel, were found to be nearly the same as those for the association of the same cations with the unbound macrocycles; this observation indicates the possibility o…
A 6-D structural model for the icosahedral (Al, Si)-Mn quasicrystal
A 6-dimensional (6-D) periodic model is proposed for the Al-Mn-Si icosahedral quasiperiodic crystal. The model results from an embedding of the periodic cubic α structure in 6-D. In the Janner-Janssen-Bak description, it consists of three concentric spherical shells of respectively Mn, Al and Al aligned in perpendicul…
Flattening of grooves on a crystal surface : a method of investigation of surface roughness
The decay of a profile artificially produced on a crystal surface below its roughening transition is studied by means of a qualitative theory. In the case of a bidirectional modulation the height h(t) is a linear function of time t and the lifetime τ is proportional to λ 3h(0), where λ is the wavelength. As suggested…
Distance dependence of photoinduced long-range electron transfer in zinc/ruthenium-modified myoglobins
An experimental investigation of the distance dependence of long-range electron transfer in zinc/ruthenium-modified myoglobins has been performed. The modified proteins were prepared by substitution of zinc mesoporphyrin IX diacid (ZnP) for the heme in each of four previously characterized pentaammineruthenium(III) (a…
AN INTERNAL FRICTION STUDY OF INTERFACE DYNAMICS IN THE PROCESS OF PHASE TRANSFORMATIONS OF NiTi ALLOY
The Martensitic (MP) and incommensurate/commensurate (I/C) phase transformations during the athermal process of NiTi alloy were studied by the measurements of internal friction, elastic modulus and electric resistance simultaneously. The IF behaviour in the processes of MP and I/C phase transformations are nearly the…