Materials Literature
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This article presents an overview of recent studies on the behavior of carbon nanotube dispersions. The effect of attractive interactions on the percolation threshold is investigated. Contrary to this, we show that carbon nanotubes experiencing repulsive interactions exhibit a different phase behavior including liquid…
Highly oriented ZnO nanoneedle/nanorods arrays have been fabricated by direct oxidation of zinc foil in alkaline zincate ion solution at near room temperature (20 degrees C for nanoneedles, 30 degrees C for nanorods).
The spontaneous stabilization of 6.5 nm bimetallic Ni–Cr cyanide bridged nanoparticles was achieved in water. Dispersible particles were recovered from solution using two different coating agents. The magnetic studies of the particles in the powder form show either a superparamagnetic or a spin glass like behaviour de…
Palladium-catalysed coupling of the vinyl derivatives methyl acrylate, styrene and acrylonitrile with 5-bromo-10,15,20-triphenylporphyrin (MTriPPBr; M = 2H, Ni, Zn) and 5,15-dibromo-10,20-bis(3,5-di-tert-butylphenyl)porphyrin (MDAPBr(2)) produced a series of mono- and disubstituted alkenylporphyrins, thus demonstratin…
Through the use of complex core-shell structures, white light emissions are observed from a single nanoparticle doped with multiple trivalent rare-earth ions. The internal structuring of the nanoparticle to allow for a controlled degree of energy transfer a common excitation wavelength yielding the white light emissio…
A series of novel red-emitting phosphors Ag La 0.95 Eu 0.05 ( W O 4 ) 2 − x ( Mo O 4 ) x [ x = 0 – 2 ] have been synthesized and their luminescence properties investigated. All Eu 3 + activated compositions show red emission on excitation either in the charge-transfer band or Eu 3 + levels. All compositions show remar…
Tungsten oxide semiconductor films for photoelectrochemical water-splitting applications, reactively sputtered at low temperatures ( < 300 ° C ) , have demonstrated photocurrents of 3.4 mA ∕ cm 2 under AM 1.5 illumination in 0.33M H 3 PO 4 , exceeding published results for material pyrolytically fabricated at higher t…
Nanofibrous mats of a wide variety of polyaniline derivatives can be synthesized without the need for templates or functional dopants by simply introducing an initiator into the reaction mixture of a rapidly mixed reaction between monomer and oxidant.
In pursuit of designing photocleavable liposomes as drug delivery vehicles, we synthesized several amphiphilic lipids by connecting stearyl amine (as the non-polar tail) and charged amino acids (as polar heads) via the o-nitrobenzyl derivatives. The lipids containing Glu, Asp, and Lys amino acids were subjected to pho…
A gas gun has been used to investigate the shock initiation of rods of a mixture of 74 wt% PTFE and 26 wt% aluminum powders. The rods were sabot‐launched into 4340 steel anvils at impact velocities ranging from 104 to 963 m/s. A framing camera was used to observe the time sequence of events. At low velocity, no initia…
The band structures of wurtzite ZnO are calculated by the empirical pseudopotential method (EPM). The eight parameters of the Zn and O atomic pseudopotential form factors are obtained with the formula of Schluter et al.[Phys. Rev. B 12, 4200 (1975)]. The band parameters are extracted by using a k∙p Hamiltonian to fit…
Kudra, T. and Ratti, C. 2006. Foam-mat drying: Energy and cost analyses. Canadian Biosystems Engineering/Le genie des biosystemes au Canada 48: 3.27 3.32. Foam-mat drying allows processing of hardto-dry materials such as tomato paste and a variety of fruit pulps and juices. Preferential product quality stems from acce…
The anode-supported solid oxide fuel cell (SOFC) degrades when the anode is subjected to redox cycling. The degradation has qualitatively been related to microstructural changes in the nickel-yttria stabilized zirconia anode of the tested cells. In this work, the microstructural changes were observed in situ using env…
In this paper, dual-band bandpass and bandstop filters using composite right/left-handed (CRLH) metamaterial transmission lines (TLs) are developed. The conventional bandpass and bandstop filters are first designed using quarter-wave short-circuited and open-circuited stubs, respectively. Then the dual-band filters wi…
Dispersible, nearly isolated 6 nm nanoparticles of the CsNiCr(CN)6 Prussian blue analogue coated with polyvinylpyrrolidone (PVP) show superparamagnetic behaviour with a relatively high blocking temperature TB = 9 K.
Polystyrene (PS)-grafted-titanium oxide (TiO) nanoparticles with a diameter of 15 nm were prepared by the 'grafting-from' method using the surface initiator for nitroxide-mediated radical polymerization (NMRP). The graft densities were estimated to be 0.04-0.28 chains nm. Under this graft dense region it is assumed th…
The SME (shape memory effect) in an Fe–Mn–Si based SMA is governed by motion of Shockley partial dislocations which carry the fcc↔hcp phase transformations. The degree of SME is determined by preservation of the partial dislocations whereas the strength is determined by the internal stress opposing against the disloca…
Random copolymeric micelles composed of N-isopropylacrylamide (NIPAAM) and N-vinylpyrrolidone (VP) cross-linked with N,N'-methylenebisacrylamide (MBA) have been used as nanogel carriers to encapsulate N-hexylcarbamoyl-5-fluorouracil (HCFU), a prodrug of 5-FU, and have been targeted to brain tissue across blood-brain b…
Direct surface modification of biodegradable polycaprolactone (PCL) was performed without the necessity of synthesis of functionisable co-polymers. An easy-to-perform three-step procedure consisting of amination, reaction with hetero-bifunctional cross-linkers and conjugation of an RGD-motif-containing peptide was use…
Anode-supported solid oxide fuel cells (SOFCs) with thin (LSGM) electrolytes and (LDC) barrier layers were studied. The cells were fabricated by first colloidally depositing an LDC/LSGM/LDC tri-layer on a NiO-LDC anode support and co-firing. Cathodes consisting of LSCF-LSGM were then deposited and fired. Cell tests in…