Materials Literature
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The Drude tail due to photo-excited carriers in single-walled carbon nanotubes (SWNTs) has been observed in the mid-infrared region by using combination spectroscopy of synchrotron radiation and Ti:sapphire laser. It is found that the density of photo-excited carriers increases as the sample temperature is raised from…
The Cellular Potts Model (CPM) successfully simulates drainage and shear in foams. Here we use the CPM to investigate instabilities due to the flow of a single large bubble in a dry, monodisperse two-dimensional flowing foam. As in experiments in a Hele-Shaw cell, above a threshold velocity the large bubble moves fast…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPigment-Mediated Nanoweb Morphology of Poly(dimethylsiloxane)-Substituted Perylene BisimidesDianjun Yao, Bindu Tuteja, and Pudupadi R. SundararajanView Author Information Department of Chemistry, Carleton University, 1125 Colonel By…
In this paper we present structures and harmonic vibrational frequencies for the methylated silicon (111) surface from quantum chemical calculations using both cluster models and periodic boundary conditions. The results from both calculations are in very good agreement with experimentally determined frequencies. We d…
The effect of nitrogen ion implantation on the structural, optical and electrical properties of ZnSe thin films, Venkatachalam, S, Mangalaraj, D, Narayandass, Sa K, Kesavamoorthy, R, Magudapathy, P, Sundaravel, B, Kalavathi, S, Nair, K G M
The ability to change the properties of solid surfaces on demand is a key component of a multitude of established and emerging technologies. Stimuli that have previously been used to trigger changes in surface properties include changes in solvent, light, pH, ionic strength, temperature and magnetic or electric fields…
Reindeer beta-lactoglobulin (betaLG) belongs to the lipocalin superfamily. Its DNA and protein sequences have been determined and showed that it had nine residue changes from bovine betaLG. Reindeer betaLG, the structure of which was finally determined at 2.1 A resolution in space group P1, crystallized in a unit cell…
The Marseille Protein Crystallization Database (MPCD) is a new crystallization database, freely accessible via http://www.crmcn.univ-mrs.fr/mpcd/, populated with information found in the BMCD and CYCLOP. This new online database includes details about macromolecules (such as name, pI, molecular weight, number of subun…
Small-angle X-ray scattering (SAXS) performed down to small q values (q <or= 10(-3) A(-1)) is a powerful method for investigating the arrangement of filler aggregates in filled elastomers under uniaxial strain. Meanwhile, for vulcanized samples, zinc oxide is used as an additive. Owing to their high contrast, the ZnO…
A method is presented to automatically locate a crystal and its holder for centring on a goniometer spindle and alignment with an X-ray beam. Here, a novel algorithm that has been developed and tested with the images of users' crystals saved in an annotated database is described. The algorithm improves on the difficul…
A novel polymer-assisted solution approach is designed for the synthesis of flexible Ag/C coaxial nanocables via one-step reduction and carbonization under hydrothermal conditions. In the process, glucose acts as reducing agent and carbon source, and CCl 4 and poly(ethylene glycol) (PEG) are used in the system to cont…
Two new 3D NaCl-type frameworks of [M(pyrazine)2NO2]ClO4 (M = Co, Cu), consist of (4, 4) sheets of metal-pyrazine connected by mu(1,3)-nitrito, representing the first examples of mu(1,3)-nitrito bridges and exhibiting antiferromagnetism.
Dust particles with submicron radii have been observed in the scrape-off layer (SOL) and divertor region of DIII-D during normal plasma operation. The particles are observed via their relatively large cross section for Rayleigh scattering of the Nd : YAG laser used for Thomson scattering measurements of electron densi…
A straightforward way of measuring X-ray intensity fluctuation spectroscopy in a small-angle X-ray scattering configuration is demonstrated using heterodyne techniques. Two examples are presented: the Brownian motion of latex spheres in glycerol, and a Doppler velocity experiment demonstrating the motion and the relax…
Highly ordered mesoporous silica thin films have been prepared on silicon substrates by contacting PEO 106 −PPO 70 −PEO 106 (Pluronic F127) triblock copolymer films with hydrolyzed tetraethyl orthosilicate (TEOS) followed by calcination. 2D grazing angle of incidence small angle X-ray scattering (GISAXS) patterns anal…
ERK2, a prototypic member of the MAPK family, plays a central role in regulating cell growth and differentiation. MKP3, an ERK2-specific phosphatase, terminates ERK2 signaling. To understand the molecular basis of ERK2 recognition by MKP3, we carried out hydrogen/deuterium exchange mass spectrometry experiments to map…
Lyotropic liquid crystals (LLCs) have recently been employed as polymerization templates to yield highly ordered nanostructured hydrogels, which have shown promise in biological separations and tissue engineering. To allow greater control of hydrogel structure using LLC templates, this study focuses on the influence o…
We study such experimentally relevant characteristics of the Coulomb-interacting Dirac quasiparticles in disordered graphene as the quasiparticle width and density of states that can be probed by photoemission, magnetization, and tunneling measurements. We find that an interplay between the unscreened Coulomb interact…
Novel porous scaffolds were fabricated using biodegradable polylactide/chitosan blends. A combinational technique involving solvent-extracting, liquid-solid separation, and freeze-drying paths were employed. The processing parameters were optimized in order to produce desired porous scaffolds and thus obtained scaffol…
Suzuki couplings were used to efficiently introduce porphyrin, fluorene, and bithiophene chromophores on the surface of single-walled carbon nanotubes. The nanotube-bound chromophores imparted good solubility to the product and exhibited fluorescence quenching due to photoinduced electron transfer to the nanotubes.