Materials Literature
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Nylon-4,6 nanofibres with diameters ranging from about 1 µm down to 1 nm were prepared by electrospinning. The fibre diameter was varied by adjusting the concentration of the polymer solution. Electrospinning of a concentrated solution of as high as 20% nylon-4,6 by weight in formic acid produced a ribbon-like electro…
To exploit the novel size-dependent mechanical properties of nanowires, it is necessary for one to develop strategies to control the strength and toughness of these materials. Here, we report on the mechanical properties of silver nanowires with a unique fivefold twin structure using a lateral force atomic force micro…
Carbon nanotubes (CNT) are intensively being developed for biomedical applications including drug and gene delivery. Although all possible clinical applications will require compatibility of CNT with the biological milieu, their in vivo capabilities and limitations have not yet been explored. In this work, water-solub…
The cavities in coordination boxes, cages, and capsules are attracting much attention because of their encapsulation, catalytic reaction, and stereoselective transformation properties. “Inorganic Tennis Ball” (“ITB”) was named to the supramolecule obtained from the self-assembly of Cu(BF4)2 and (dach)Pt(BETMP) (dach =…
The Abelès method is a classical method for determining the refractive index of dielectric thin films. In this paper we examine the main features of the method in a formal manner, using closed-form equations, and we show that the method is ambiguous in certain yet unreported situations.
In this work we report on molecular dynamics simulations of the embedding process of a nano-particle into a polymeric film as a function of temperature. This process has been employed experimentally in recent years to test for a shift of the glass transition of a material due to the confined film geometry and to test…
A comparative study of the effect of excess plasma on the photoelectron spectra (PES) of crystalline gallium phosphide (GaP) wafer and “nanoporous” GaP network samples have been carried out. Rigid shift along with large changes in the line shapes of PES of nanoporous GaP have been observed in the presence of secondary…
Summary The formation of mineral scale (carbonate/sulfate/sulfide) within the near wellbore, production tubing, and topside process equipment has presented a challenge to the oil and gas industry for more than 50 years. Chemical methods to control scale have been developed including scale squeeze treatments and contin…
The structure of liquid Ge 15 Te 85 , Ge 25 Te 75 and Ge 33 Te 67 alloys has been studied by neutron and x-ray diffraction. Datasets obtained by the two techniques have been modelled simultaneously with the reverse Monte Carlo simulation method. As a result, the first coordination numbers and nearest neighbour distanc…
Thermoand photochromic indolinobenzospiropyran dyes recently have become important in connection with the rapid development of information recording systems, such as high-density optical data storage, optical switching, displays and non-linear optics. These molecules are known to be in equilibrium with their metastabl…
Thermoelectric properties of γ-Sr0.32Na0.21CoO2 epitaxial films, which were fabricated on the (0001)-face of α-Al2O3 substrates by ion exchange processes between Na+ and Sr2+ ions with γ-Na0.8CoO2 epitaxial films, were measured to clarify the effect of Sr2+-ion exchange of γ-Na0.8CoO2 on the thermoelectric properties.…
Summary Calcium carbonate scale formation during flow in porous media was studied using radioactive tracer technology; in a series of calcite scaling experiments in sandpacks,47Ca was used as a tracer to monitor CaCO3 deposition. In these experiments, the induction time and the distribution of scale deposition were st…
Summary Conventional testing of scale inhibitors (SIs) usually focuses only on the inhibition of bulk depositional processes (e.g., in jar tests of inhibition efficiency). In previous work, we have extended the study of inhibition efficiency to examine both bulk and surface depositional processes and their inhibition…
The electron field emission of carbon nanotube (CNT)/boron-doped diamond (BDD)/carbon felt electrodes (CNT/BDD/felt) have been investigated. The composite electrode was initially prepared with the growth of BDD on carbon felt and the subsequent growth of CNT by chemical decomposition of methanol. The composite electro…
The luminescence properties of Eu3+:Tb3+:Al2O3 powders prepared by low-temperature direct combustion synthesis was investigated. It was observed that the presence of Tb3+ (1.0mol%) modifies the dynamics of the radiative transition D05→F27 of Eu3+ (1.0mol%) and produces an enhancement of the luminescence intensity by o…
An equivalent circuit model is proposed for the Schottky barrier at the junction between a metallic electrode and a semiconducting carbon nanotube (NT). We have applied the model to a gold-NT junction under the presence of neutral polarized NH3 molecules, and have shown that visible Schottky barrier modulation is poss…
Depositing polymdimethylsiloxane (PDMS) from an isopropanol solution onto a glass slide surface by wiping with a fuzz-free wipe results in highly ordered structures. Dewetting of the highly diluted PDMS solution and evaporation of the solvent yields nanostructures. The structure is well characterized as polymer nanoch…
We present soft x-ray absorption spectroscopy (XAS) on spinel manganites and show it can be used as a powerful tool to directly probe the Jahn-Teller (JT) splitting energy in transition metal oxides. The MnL2,3-edge XAS spectra of the spinel ZnMnxGa2−xO4(x=0.5,1.0,1.4,and2.0) and AMn2O4(A=MgandCd) change very systemat…
The performance of a pyroelectric detector with a carbon multiwalled nanotube coating was evaluated in the 0.9-14 microm wavelength range. The relative spectral responsivity of this detector was shown to be flat over most of the wavelength range examined, and the spectral flatness was shown to be comparable to the bes…
We report that hyper-Rayleigh scattering, surface-enhanced hyper-Raman scattering, and two-photon excited luminescence occur intermittently by focusing a continuous-wave near-infrared (cw-NIR) laser into a colloidal silver solution including rhodamine 6G (R6G) and sodium chloride (NaCl). On the other hand, continuous…