Materials Literature
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Polyaniline (PAn) was synthesized chemically and doped with various dopants, such as HCl, HCOOH, I2 and methylene blue (C16 H18 ClN3 S), by an immersion method. The structure of these samples was investigated by infrared (IR) spectroscopy and wide-angle X-ray diffraction (WAXD) analysis. Remarkable changes have been o…
In this paper, a newly developed polymer, shape memory polyurethane (SMP), will be introduced. The shape memory polymer possesses the same basic shape memory effect and elasticity memory effect as shape memory alloys. Shape memory polymers can change their elastic modulus up to 500 times around their glass transition…
A refined and generalized version of a previously suggested model of the silica surface, in which geminal silanols are situated on surface segments similar to (100)-type faces of the β-cristobalite structure and single silanols are situated on surface segments similar to corresponding (111)-type faces, is supported by…
Abstract The considerable progress made in the development of fundamental and applied aspects of sonoelectrochemistry, the coupling of power ultrasound into an electrochemical experiment, is reviewed with respect mainly to the measurement and analysis of effects observed in conventional sonoelectrochemical experiments…
Abstract A general kinetic treatment of the system with intermolecular chain transfer followed by fast reinitiation is given. It leads to the broadening of the molecular weight distribution (MWD), the number of growing chains being invariable. Thus, this system can be considered as a special case of living polymerizat…
Hydrosilylation is a reaction widely used in the silicones industry for the preparation of monomers, containing silicon-carbon bonds, and for crosslinking polymers, and results in a variety of products. Hydrosilylation reactions are catalysed by highly active platinum catalysts, such as the silicone-soluble Karstedt’s…
We report the results of nonrelativistic and relativistic gradient-corrected density functional calculations on the interaction of single transition metal atoms with the oxygen sites of the regular MgO(001) surface. The surface has been represented by stoichiometric clusters of ions embedded in large arrays of point c…
By applying the plate count and clear-zone methods, it was confirmed that polylactide (PLA)-degrading microorganisms are sparsely distributed in soil environments. An Amycolatopsis isolate was successfully isolated. Microbial degradation of PLA film was demonstrated; i.e., about 60% of the 100-mg film initially added…
Stable colloidal suspensions of cellulose crystallites with negatively charged sulfate groups on their surface were prepared by acid hydrolysis of filter paper. The suspensions, which were free of added electrolyte, formed chiral nematic ordered phases above a critical concentration. A sharp boundary was observed betw…
We have prepared transparent, super‐water‐repellent coating films of alumina on glass plates by a combination of geometric and chemical approaches. The contact angle for water in the films was 165° and the transmittance for visible light was higher than 92%. A roughness of 20 to 50 nm was obtained, which is too small…
Infrared spectroscopy of a ${\mathrm{LaCoO}}_{3}$ crystal has revealed anomalous splitting of the phonon modes as well as their intensity variation with temperature during the spin-state transition. The observed results can be interpreted in terms of local lattice distortion arising from the Jahn-Teller effect of the…
We report on the application of Raman scattering as a probe to follow the structural evolution of TiO 2 aerogels. We have traced the evolution of the 142 and 630 cm -1 E g anatase peaks as a function of morphology. The results have been analyzed in terms of the q vector relaxation mechanism which predicts a unique rel…
Monodisperse poly(styrene- b -semifluorinated side chain) block copolymers were synthesized by anionic polymerization of poly(styrene- b -1,2/3,4-isoprene) followed by the corresponding polymer analogous reactions. By controlling the block copolymer composition and the relative lengths of the fluorocarbon and hydrocar…
The instantaneous normal mode (INM) approach to liquid state dynamics is presented. INM is put in historical context, and the underlying physical ideas, including the importance of the potential energy landscape, are explained. It is shown that INM can be the basis of a general starting point for dynamical calculation…
The program DISCUS is a versatile tool for the analysis of diffuse scattering and for defect structure simulations. The model structure can be created from an asymmetric unit of a unit cell or a complete structure can be read from a file. A Fortran77 style interpreter that includes IF statements and various loops comb…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Characterization of a Reactive Vinyl-Functionalized MCM-41: Probing the Internal Pore Structure by a Bromination ReactionMyong H. Lim, Christopher F. Blanford, and Andreas SteinView Author Information Department of Chemistry, University of Minnesota 207 P…
Solid-state scientists have many analytical techniques to choose from. But electron energy-loss spectroscopy does some things that no other technique can quite match. Electron energy-loss spectroscopy can, for example, form chemical maps of nanometre-sized regions in solid samples. It can be used to characterize inter…
The metal-insulator transition is mixed-valence manganites of the (${\mathrm{La}}_{0.7}$${\mathrm{Ca}}_{0.3}$)${\mathrm{MnO}}_{3}$ type is ascribed to a modification of the spin-dependent potential ${\mathrm{J}}_{\mathrm{H}}$s\ensuremath{\cdot}S associated with the onset of magnetic order at ${\mathrm{T}}_{\mathrm{C}}…
A simple method is used to prepare highly monodispersed silver nanoparticles in the liquid phase, which starts from an initial synthesis in functionalized AOT reverse micelles. To narrow the particle size distribution from 43% to 12.5% in dispersion, the particles are extracted from the micellar solution. The size-sel…
Exciton energy levels and corresponding optical spectra are calculated in carbon nanotubes (CN) in the conventional screened Hartree-Fock approximation within a k · p scheme. The Coulomb interaction gives rise to several exciton bound states as well as the increase of the energy gap. The exciton energy is shifted to h…