Materials Literature
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Divacancies are among the most important defects that alter the charge transport properties of single-walled carbon nanotubes (SWNT), and we here study, using ab initio calculations, their properties. Two structures were investigated, one that has two pentagons side by side with an octagon (585) and another composed o…
In a well-dispersed nanofluid with strong cluster-fluid attraction, thermal conduction paths can arise through percolating amorphous-like interfacial structures. This results in a thermal conductivity enhancement beyond the Maxwell limit of 3*phi, with phi being the nanoparticle volume fraction. Our findings from non-…
A large measured 2D diffusion coefficient of gold nanoclusters on graphite has been known experimentally and theoretically for about a decade. When subjected to a lateral force, these clusters should slide with an amount of friction that could be measured. We examine the hypothetical possibility to measure by Quartz C…
Iron oxide nanotubes of 50−150 nm outer diameter and 2−20 nm wall thickness are prepared in ordered arrays. Atomic layer deposition (ALD) of Fe 2 O 3 from the precursor iron(III) tert -butoxide at 130−180 °C yields very smooth coverage of the pore walls of anodic alumina templates, with thickness growth of 0.26(±0.04)…
A tensonometer for stretching metal foils has been constructed for the study of strain broadening in X-ray diffraction line profiles. This device, which is designed for use on powder diffractometers and was tested on Station 2.3 at Daresbury Laboratory, allows in situ measurements to be performed on samples under stre…
In order to help resolve unknowns regarding aging effects of uranium during long-term storage of tritium, a number of experiments have been carried out by several researchers. However, almost no literature is available on the structural change of uranium tritide, mainly because its high toxicity and air-sensitivity re…
The paper reports an understanding of the novel surface phenomenon that the amount and reactivity of adsorbed NO on a Co 2+ -ensemble/γ-Al 2 O 3 catalyst are increased by gas-phase CO molecules undetectable at the catalyst surface. The nature of adsorbed NO species and the structures of divalent Co species were charac…
Tris(2-hydroxymethyl-4-oxo-4H-pyran-5-olato-κ2O5,O4)iron(III) [Fe(ka)3], has been characterised by magnetic susceptibility measurements Mössbauer and EPR spectroscopy. The crystal structure of [Fe(ka)3] has been determined by powder X-ray diffraction analysis. Magnetic susceptibility and EPR measurements indicated a p…
Through ab initio -based simulations of the perovskite ferroelectric ultrathin films, we find that on applying an external electric field, ferroelectric ultrathin films can form kinds of self-organization nanodomain patterns including concentric loop stripes and nanodomain lattices. The characteristic size of the doma…
Fe–MgO nanocomposites synthesized by the mechanical high-energy transfer technique were characterized by x-ray diffraction (XRD), transmission electron microscopy, Mössbauer spectroscopy and dc magnetization studies. By varying the duration of milling, powder with different grain sizes in the range 17–40 nm was produc…
There is no reported research in the literature of using shape-memory alloy (SMA) actuators for variable area exhaust nozzles for a jet engine, to the authors’ best knowledge. SMA actuators have the advantage of a high power-to-weight ratio and can result in dramatic weight reduction as compared to hydraulic systems.…
Zinc oxide nanoparticles have been processed from a novel isophthalate precursor. In contrast to those processed from an oxalate precursor, this material exhibits three-dimensional, non-directional aggregation behaviour. Such non-directional aggregation of uniaxial crystallites may allow for the production of structur…
Carbon nanotube reinforced composites offer enhancements in fracture properties since the reinforcing nanotubes provide a bridging mechanism to resist crack growth. In this paper, a study of crack bridging by nanotubes in a nanotube-reinforced polymer composite is presented. The process of crack bridging is idealized…
Doubly functionalized dendrimerlike poly(ethylene oxide)s (PEOs) carrying 16 hydroxyl groups at their periphery and one aldehyde group at their focal point were synthesized up to the fourth generation through an iterative divergent approach. First, a protected aldehyde dihydroxyl compound, namely, 3,3-diethoxy-1,2-pro…
Irradiation of thin films of sub stoichiometric germanium oxide (GeO x ) has been carried out using swift heavy ions. Micro-Raman studies of the films indicate the formation of Ge crystallites as a result of irradiation. Moreover, crystallinity of Ge improves with an increase in fluence. Glancing angle x-ray diffracti…
Photoabsorption and photoluminescence properties of single and double oxygen vacancy (OV and DOV) defects in quartz-like germanium oxide have been investigated by high-level ab initio calculations. It has been found that photoabsorption for these systems occurs at lower energies as compared to the analogous defects in…
The interlayer magnetoresistance ${\ensuremath{\rho}}_{zz}$ of the organic metal $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{BEDT}\mathrm{\text{\ensuremath{-}}}\mathrm{TTF}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ is studied in fields of up to 45 T and at temperatures $T$ from 0.5 to 30 K. The peak in ${\…
A series of novel binuclear ferro- and antiferromagnetic Cu(2+) chelates of structurally broadly varied Schiff bases (derived from o-tosylamino(hydroxyl)benzaldehydes and monoalkylated o-phenylenediamine, o-aminophenol, o-aminothiophenol, 1,2-diaminobenzimidazole, 1-aminobenzimidazoline-2-thione) and β-diketimines (de…
Critical coagulation concentrations for several inorganic and metallodendrimer coagulants have been determined for dispersion of single-walled carbon nanotubes in nonaqueous solvent. The behavior of the nanotubes is not consistent with previously reported coagulations from aqueous electrolytes and is not described usi…
We consider the dynamics of spin facilitated models of glasses in the non-equilibrium ageing regime following a sudden quench from high to low temperatures. We briefly review known results obtained for the broad class of kinetically constrained models, and then present new results for the behaviour of the one-spin fac…