Materials Literature
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Abstract Polypyrroles doped with two dopants were prepared by chemical polymerization in aqueous solutions of pyrrole monomer. The solutions contained dodecylbenzenesulfonic acid (DBSA) as a dopant, tetraethylammonium tetrafluoroborate (TEABF 4 ) as a codopant, and ammonium persulfate (APS) as an oxidant. The PPy comp…
Crack growth resistance curves for the non-linear fracture parameters KR, JR and R were measured for unirradiated PGA and IM1-24 graphites that are used as moderators in British Magnox and AGR nuclear reactors respectively. All the curves show an initial rising part, followed by a plateau region where the measured par…
Budlike single-wall carbon nanohorns (SWNHs), being capped hollow materials, were oxidized by heating in oxygen to produce nano-order windows in the walls. The opening of budlike SWNHs was studied with transmission electron microscopy and nitrogen adsorption at 77 K. The adsorption isotherms show development of the po…
In this paper we review the existing theoretical literature on hydrogen storage in single-walled carbon nanotubes. The importance of theoretical simulations for understanding the adsorption procedure and for improving the storage capacity of these nano-materials is underlined. We report two different categories of the…
Supramolecular triads of the type (donor-1)−acceptor:(donor-2) composed of free-base porphyrin, fullerene, and zinc porphyrin, have been formed by a “covalent-coordinate” approach. Toward this, two diads, namely, 5-(3‘-(2‘ ‘-(3‘ ‘‘ or 4‘ ‘‘-pyridyl)fulleropyrrolidinyl- N )ethoxyphenyl)-10,15,20-triphenylporphyrin, bea…
36 kinds of donor(D)–acceptor(A) type charge transfer (CT) solids were prepared based on ethylenedioxyethylenedithiotetrathiafulvalene (EDOEDT-TTF or EOET), which is a hybrid molecule of bis(ethylenedioxy)-TTF (BEDO-TTF or BO) and bis(ethylenedithio)-TTF (BEDT-TTF or ET). A plot of the first CT absorption bands in sol…
Abstract The main goal of this study was impact modification of polyacetal [polyoxymethylene (POM)] with thermoplastic elastomer polyurethane (TPU). We modified the impact strength of POM 10‐fold. The mechanical properties, thermal behavior, and morphology of POM/TPU blends consisting of 5 to 50% of TPU were studied.…
Interactions between opposed brush layers of polyelectrolytes ionized poly( l -glutamic acid) (PLGA) or poly( l -lysine) (PLL) in water were directly investigated using surface forces measurement. The brush layers were prepared by the Langmuir−Blodgett deposition of amphiphiles bearing PLGA (degree of polymerization n…
Abstract Graft copolymerization of ε‐caprolactone (CL) and lactic acid (LA) onto cellulose diacetate (CDA) at the residual hydroxyl positions was conducted to obtain thermoplastic CDA. The effects of the reaction temperature and time and the CL/LA molar ratio in the feed on the progress of the graft copolymerization w…
Extended porous silica films with thicknesses in the range of 60 to 130 μm and pores on both the meso- and macroscale have been prepared by simultaneously using porous membrane templates and amphiphilic supramolecular aggregates as porogens. The macropore size is determined by the cellulose acetate or polyamide membra…
Using molecular dynamics calculations, we investigate the absorption of a C(60) molecule in a (10,10) nanotube either through the open end or a large defect in the tube wall as possible scenarios for the hierarchical self-assembly of (C(60))(n)@(10,10) "nano-peapods." We find the absorption through a defect to be sign…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCurrent Trends in Patterning with CopperJ. Rickerby and J. H. G. SteinkeView Author Information Department of Chemistry, Imperial College of Science, Technology and Medicine, South Kensington, London, SW7 2AY, U.K. Cite this: Chem. Rev. 2002, 102, 5, 1525–1550Publication Dat…
The structure of a poly(dimethylsiloxane) (PDMS) layer at the surface of hydrophilic silica has been studied by means of DSC, proton NMR T 2 relaxation experiments, and 1 H and 29 Si NMR spectroscopy. The samples were prepared using (1) the adsorption of PDMS from a PDMS solution onto the silica surface followed by a…
Regular arrays of single colloidal particles on confined regions of patterned polyelectrolyte templates are fabricated based on alternating charged docking sites and neutral deposition resists on the surface. The diameter ratio between surface patterns and the colloid controls the size and spatial arrangement of the c…
The oxidation of toluene was studied in a jet-stirred reactor at 1 atm. New experimental results were obtained over the high temperature range 1000–1375 K, and variable equivalence ratio (0.5 ⩽ φ ⩽ 1.5). Concentration profiles of reactants, stable intermediates and final products were measured by probe sampling follow…
This paper describes a vapor-phase, precursor method that generates MgO nanowires at relatively low temperatures (800–900 °C) as compared to previous approaches (≥ 1200 °C) that directly use MgO as the source material. Magnesium diboride (MgB2) powders were used as the precursor, which slowly decomposed into Mg and Mg…
It has long been recognized that the key to understand kinetic friction force $F_k$ is the analysis of microscopic instabilities that lead to sudden irreversible "pops" of certain degrees of freedom. In this Letter, the nature of such instabilities is characterized with an emphasis on boundary lubricants. It is shown…
Novel first through fourth generation hybrid dendritic-linear copolymers, composed entirely of building blocks known to be biocompatible or degradable to natural metabolites in vivo, are described. Specifically, these copolymers are composed of poly(ethylene glycol), glycerol, and succinic acid and are synthesized usi…
The electrochemical reduction of Cu(II) bis(thiosemicarbazone) complexes [Cu(II)(btsc)] is accompanied by protonation to give an unstable Cu(I) intermediate [Cu(btscH(2))](+). The nature of this intermediate was probed by reaction of bis(thiosemicarbazone) ligands with a Cu(I) precursor which gave a novel helical dime…
The experimentally observed temperature dependence of the quartic coefficients in the Landau-Devonshire expansion for BaTiO_3 is naturally accounted for within a proper fluctuation model. It is explained, in particular, why one of the quartic coefficients varies with temperature above T_c while the second is constant.…