Materials Literature
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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.…
The selective adsorption of two different types of particles to a patterned surface is shown for thiol-modified gold. The far end of the alkanethiols is chemically varied and binds polymer particles with different properties—as illustrated in the Figure for charged polymer particles of different composition and size.…
Systematic X-ray photoelectron spectroscopy (XPS), X-ray induced Auger electron spectroscopy (AES), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) studies were undertaken to investigate the electronic structure, chemical states and local geometry of the active species…
The angular distribution of the intensity in photoemission experiments is affected by electron diffraction patterns and by a smoothly varying ISO contribution originated by both intrumental details and physical properties of the samples. The origin of the various contributions to the ISO component has been identified…
Vapor-sensitive thin-film resistors comprising gold nanoparticles and different types of organic dendrimers (polyphenylene, poly(propylene imine) and poly(amidoamine)) were prepared via layer-by-layer self-assembly and characterized by UV/vis spectroscopy, atomic force microscopy, and conductivity measurements. While…
This article describes a solution-phase, self-seeding approach to the large-scale synthesis of one-dimensional (1D) nanostructures of trigonal tellurium (t-Te) with diameters ranging from 50 to hundreds of nanometers, and lengths up to tens of micrometers. These highly anisotropic nanostructures were formed through th…
A novel approach, i.e., ultrasonic irradiation, was used to prepare polyaniline/nanocrystalline TiO 2 composite particles. Polymerization of aniline proceeded under ultrasonic irradiation in the presence of nanocrystalline TiO 2 . The aggregation of nano TiO 2 can be reduced under ultrasonic irradiation, and the nanop…
Abstract The aim of this article was to elucidate the basic relationships between processing conditions and the mechanical and electrical properties of multiwalled carbon nanotube reinforced polymer composites. In conventional chopped fiber reinforced polymer composites, uniform distributions of fibers throughout the…