Materials Literature
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Abstract Summary: The graft polymerization of styrene and (meth)acrylic monomers via ATRP from cross‐linked rubber particles, produced by recycled tires (“ground tire rubber”, GTR), is reported. GTR particles, obtained by cryogenic grinding process, still contain CC unsaturations on the surface, which were first oxid…
This study develops a continuum theory of small-deformation single crystal plasticity that includes ‘strain gradients’ and ‘strain rate gradients’ in the spirit of our recent papers (Gurtin and Anand 2005a, 2005b) for isotropic plasticity. Specifically, we develop a constitutive theory that allows for energetic micros…
In non-close-packed crystalline lattices, e.g. bcc metals and intermetallics, the stress-state dependence of the Peierls barrier for the motion of a screw dislocation violates Schmid's law and leads to non-associated plastic flow in single crystals and polycrystalline aggregates (Bassani 1994 Adv. Appl. Mech. 30 191–2…
Polyaniline (PANI) nanofibre films were fabricated on an indium–tin oxide (ITO) glass substrate through a controlled electropolymerization process. The PANI nanofibres grow vertically on an ITO substrate and are tapered, with average diameters of 20 and 15 nm for the base and top, respectively. The influence of the el…
The diameter dependent magnetoresistance of a single Ni nanowire (i.e. 200 and 30 nm diameter) bridging microfabricated Ni electrodes was investigated at temperatures ranging from 10 to 300 K. Overall, the magnetotransport behaviour of single Ni nanowires was similar to the results for thin films, except that the magn…
FeNi3/(Ni0.5Zn0.5)Fe2O4 nanocomposite particles were successfully synthesized using the hydrazine reduction combined with ammonia co-precipitation ferrite coating method. The x-ray and transmission electron microscopy analysis showed that face-centred cubic-structured FeNi3 nanoparticles were coated with spinel Ni–Zn…
We show, by computer simulation, that tapered or pear-shaped particles, interacting through purely repulsive interactions, can freely self-assemble to form the three-dimensionally periodic, gyroid cubic phase. The Ia3d gyroid cubic phase is formed by these particles on both compression of an isotropic configuration an…
Water adsorption on a NaCl (001) surface has been studied using density functional theory (DFT) with a generalized gradient approximation (GGA). Water monomer is more likely to locate near the top site with its O atom adjacent to ${\mathrm{Na}}^{+}$ and its H atoms attracted by the nearest ${\mathrm{Cl}}^{\ensuremath{…
Freestanding porous gold films with arrays of spherical pores or hollow spheres were fabricated photochemically. UV irradiation of a polystyrene-sphere (PS) colloidal crystal template floating on a solution containing HAuCl4 and Na2SO3 led to gold deposition, and then PS removal gave a spherical-pore array. Irradiatin…
The correlation between the morphology of mixed polymer brushes and fluctuations of the grafting points is investigated by single-chain-in-mean-field simulations and experiments. The local topography of two types of mixed polystyrene-polymethylmethacrylate (PS-PMMA) brushes that differ in their modes of attachment has…
Ag nanoparticles, with diameters estimated to be 17 ± 6 nm, were observed to react readily with I 2 to produce Ag@AgI core−shell nanoparticles. Both spin−orbit components of the exciton associated with the AgI shell were observed in the UV−vis spectra. The band gap of the AgI shell was found to shift to lower energy a…
Abstract The low‐density poly(ethylene), which is prone to hydrophilicity, dyeability, and bondability, was modified by surface barrier discharge and radio‐frequency discharge plasma. A process of plasma modification was investigated to improve adhesion between poly(ethylene) and more polar polymers, to improve surfac…
Abstract In this article, a novel technique for the fabrication of surface enhanced Raman scattering (SERS) active silver clusters on glassy carbon (GC) has been proposed. It was found that silver clusters could be formed on a layer of positively charged poly(diallyldimethylammonium) (PDDA) anchored to a carbon surfac…
We investigated the effect of the buffer layer thickness on the structural and optical properties of ZnO nanorods grown on Si substrates by metalorganic chemical vapour deposition. Increasing the thickness of the buffer layer significantly enhanced the vertical alignment and density of the nanorods. The ZnO nanorods g…
Abstract The self‐assembling behavior, at physiological pH, of the amphiphile peptide (C18) 2 L5CCK8 in nanostructures is reported. Stable aggregates presenting a critical micellar concentration of 2 × 10 −6 mol kg −1 , and characterized by water exposed CCK8 peptide in β‐sheet conformation, are obtained. Small angle…
Functional analyses of the different proteins involved in the synthesis and accumulation of polyhydroxyalkanoates (PHAs) in P. putida U were performed using a mutant in which the pha locus had been deleted (PpUDeltapha). These studies showed that: (i) Pha enzymes cannot be replaced by other proteins in this bacterium,…
We address the problem of the rectifying effect of heat conduction at macroscopic size. A design for a macroscopic thermal rectifier based on the macroscopic thermal conductivity of materials is introduced, and then realizations of the design are shown by numerical simulations and phenomenological estimations.
Fluorescence intermittency, or blinking, of individual close-packed clusters containing two or more CdSe-ZnS quantum dots (QDs) was investigated. The QD clusters exhibited rapid, intense blinking that was distinct from that of isolated QDs blinking independently. This enhanced blinking is suggested to occur when the Q…
The room temperature stability of nanometer-sized silver clusters in silica matrices has been investigated by following the temporal evolution of their surface plasmon absorption. Ag clusters in SiO2 were prepared by either annealing silica samples doped with atomic silver or by co-deposition of preformed clusters of…
Iron phosphate nanotubes with mesoporous walls are solvothermally synthesized using sodium dodecyl sulfate (SDS) as a template. With different template concentrations, various shapes of nanosized iron phosphates can be obtained. When the concentration of SDS is set at the transition regions between the lamellar and th…