Materials Literature
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We report the selective chemical attachment of infrared emitting PbSe nanocrystal quantum dots onto micron-scale glass photonic beads. Upon optical excitation, photoluminescence from the shell of nanocrystals is seen to couple into the high-Q 'whispering gallery' modes of the bead via the evanescent optical field, res…
Energy conversion today is subject to high thermodynamic losses. About 50% to 90% of the exergy of primary fuels is lost during conversion into power or heat. The fast increasing world energy demand makes a further increase of conversion efficiencies inevitable. The substantial thermodynamic losses (exergy losses of 2…
The increased solubility and uniform dispersal of branched azobenzene chromophores over their monomeric analogues have been shown to improve the electrooptic performance of high glass transition temperature ( T g ) blended polymers. We report here the application of these branched chromophores as guest nonlinear optic…
The influence of intrinsic chain stiffness on surface forces in solutions containing semiflexible polymers is investigated with density functional theory. The solvent is included explicitly, but comparisons are also made with exact results obtained with ideal chains, in the absence of solvent particles. We find that a…
The giant polyelectrolyte glycosaminoglycan hyaluronan (1-10 MDa) is a major component of the pericellular coat on a variety of cells, where it is an important modulator and mediator of early cell adhesion events. This pericellular layer can reach 5 mum thickness on cells that produce cartilage (chondrocytes), and up…
Abstract A diamond light emitting diode (LED) activated with Xe‐related optical centres is reported. The device was made on a high quality single crystal CVD diamond substrate using B + and Li + ion implantation, subsequent implantation by Xe + ions and vacuum annealing to 1400 °C. A diode behaviour with the rectifica…
Palladium nanoparticles formed by the reduction of palladium(II) chloride with methanol or 2-propanol are stabilized by entrapment in solid heavily fluorinated compounds, as suggested by powder X-ray diffraction. Some of the stabilizers are fluorohydrocarbons without a functional group. Calculations suggest that minor…
Abstract With the action of catalyst and cosolvent, a series of hydroxyl‐terminated polydimethylsiloxane (HPMS) based polyurethane (PU) micro‐emulsion were gotten by surfactant‐free copolymerization. They were successfully prepared by reacting isophorone isocyanate, poly(tetramethylene glycol), and HPMS with N ‐methyl…
Effects of multiple and dependent or correlated elastic scattering of phonons due to nanoparticles on thermal transport in random nano-particulate media (random phononic crystals) are investigated in this paper under various approximations. Multiple scattering means that the scattered wave from one particle is inciden…
By means of quasielastic neutron scattering, we have investigated the dynamics of two polymers, head-to-head poly(propylene) (HHPP) and poly(ethylene−propylene) (PEP), through the incoherent scattering function of hydrogens, i.e., the H self-correlation function. Backscattering techniques have allowed us to cover meso…
Application of an electric field to microspheres, dispersed in a nematic liquid crystal host material, causes particle translation along the direction of the average long molecular liquid crystal axis, i.e., the director. We have determined the stability regime of linear particle displacement in the parameter space of…
From Raman spectroscopy, magnetization, and thermal expansion on the system La(2/3)(Ca(1-x)Sr(x))(1/3)MnO3, we have been able to provide a quantitative basis for the heterogeneous electronic model for manganites exhibiting colossal magnetoresistance (CMR). We construct a mean-field model that accounts quantitatively f…
The synthesis and characterization of alumina-mesoporous silica (alumina-MS) hybrid membranes are reported. The hybrids are formed using a variation of the evaporative-induced self-assembly (EISA) process reported by Hayward et al. (Langmuir 2004, 20, 5998) based on dip coating of an Anopore 200 nm membrane with a Bri…
The connection between thermodynamic, transport, and potential-energy landscape features is studied for liquids with Lennard-Jones-type pair interactions using both microcanonical molecular-dynamics and isothermal-isobaric ensemble Monte Carlo simulations. Instantaneous normal-mode and saddle-point analyses of two var…
A multiwall carbon nanotube (MWCNT) consists of several or many concentric carbon shells, each of which could be metallic or semiconducting. Both theoretical predictions and experimental results suggest that MWCNTs have exotic electronic structures and intriguing transport properties, which are highly dependent on chi…
Through introducing the iPP fibers having different molecular weights into their supercooled or molten matrices, fiber/matrix single polymer composites of iPP have been prepared, and the obtained interfacial morphologies were studied by means of polarized light microscopy. It was found that the interfacial supramolecu…
A novel structure of orbital ordering is found in a ${\mathrm{Nd}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3}$ thin film, which exhibits a clear first-order transition, by synchrotron x-ray diffraction measurements. Lattice parameters vary drastically at the metal-insulator transition at 170 K ($={T}_{\mathrm{MI}}$),…
The efficient one-step synthesis of oxacalixarene-bisporphyrins and higher oligomers from readily available starting materials is described. The X-ray structure of one oxacalix[4]arene-locked cofacial bisporphyrin, prepared in 91% yield, shows an 1,3-alternate conformation of the molecule with partial overlap of the t…
The wetting properties of individual boron nitride nanotubes (BNNTs) were studied with the Wilhelmy method in ambient conditions. A nanotube-based force sensor having a force resolution of 0.1 nN, calibrated with the wetting force method, was used to study the interactions between BNNTs and liquids in situ. The static…
Abstract A new approximation for the temperature integral has been obtained by using Pattern Search method. The corresponding equation for the evaluation of kinetic parameters is presented, which can be put in the form The validity of the new temperature integral approximation has been tested by numerical calculation.…