Materials Literature
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We present a first-principles method for the calculation of optical excitations in nanosystems. The method is based on solving the Bethe-Salpeter equation (BSE) for neutral excitations. The electron self-energy is evaluated within the GW approximation, with dynamical screening effects described within time-dependent d…
A theory of spin-polarized electron transport in ferromagnet/semiconductor heterostructures, based on a unified semiclassical description of ballistic and diffusive transport in semiconductor structures, is developed. The aim is to provide a framework for studying the interplay of spin relaxation and transport mechani…
A series of charge-separable and hole-transporting phenylazomethine dendrimers with a triarylamine core are prepared and evaluated for use as a charge separator in dye-sensitized solar cells (DSSCs). Triphenylamine with dendric phenylazomethine (TPA-DPA) is prepared by synthesizing up to five generations of dendrons u…
The spectroscopic behavior of gadolinium gallium garnet (Gd3Ga5O12, GGG) nanocrystals codoped with 1% each of Tm3+ and Yb3+ prepared via a solution combustion synthesis procedure was investigated. Initial excitation of the codoped nanocrystals with 465.8 nm (into the 1G4 state) showed a dominant blue-green emission as…
For the binary discs packed in two dimensions, the packing fraction of disc assembly becomes lower than that of the monodisperse system when the size ratio is close to unity. We show that the suppressed packing fraction is caused by an increase of the adjacent neighbours with long bonds where the adjacent neighbours i…
We review the phenomenology of coupled magnetic and electric order parameters for systems in which ferroelectric and incommensurate magnetic order occur simultaneously. We discuss the role that such materials might play in fabricating novel magnetoelectric devices. Then we briefly review the mean-field description of…
Resonant x-ray reflectivity of the surface of the liquid phase of the Bi$_{43}$Sn$_{57}$ eutectic alloy reveals atomic-scale demixing extending over three near-surface atomic layers. Due to the absence of underlying atomic lattice which typically defines adsorption in crystalline alloys, studies of adsorption in liqui…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPickering Stabilized Miniemulsion Polymerization: Preparation of Clay Armored LatexesSéverine Cauvin, Patrick J. Colver, and Stefan A. F. BonView Author Information Department of Chemistry, University of Warwick, Coventry CV4 7AL, U…
Bimetallic nanotubes: Uniform arrays of metal nanotubes were prepared by the electrodeposition of a thin metallic film on the pore walls of anodic aluminum oxide membranes decorated with metallic nanoparticles. Multisegmented nanotubes with a bimetallic stacking configuration along the nanotube axis can be fabricated…
We report on ab initio molecular dynamics simulations of the early stages of single-walled carbon nanotube (SWCNT) growth on metal nanoparticles. Our results show that a sp2 bonded cap is formed on an iron catalyst, following the diffusion of C atoms from hydrocarbon precursors on the nanoparticle surface. The weak ad…
A novel high flux filtration medium, consisting of a three-tier composite structure, i.e., a nonporous hydrophilic nanocomposite coating top layer, an electrospun nanofibrous substrate midlayer, and a conventional nonwoven microfibrous support, was demonstrated for oil/water emulsion separations for the first time. Th…
Calculations of the quantum-mechanical ballistic thermal conductance of single-walled carbon nanotubes, graphene, and graphite are presented, which explain previous experimental results, and directly disprove earlier theoretical calculations. The ballistic thermal conductances are smaller than had been previously thou…
Multifunctional cancer therapeutic nanodevices have been designed and synthesized using the poly(amidoamine) (PAMAM) dendrimer as a carrier. Partial acetylation of the generation 5 (G5) PAMAM dendrimer was utilized to neutralize a fraction of the primary amino groups, provide enhanced solubility of the dendrimer durin…
We present direct evidence for room-temperature magnetization reversal induced by an electric field in epitaxial ferroelectric BiFeO3-ferrimagnetic CoFe2O4 columnar nanostructures. Piezoelectric force microscopy and magnetic force microscopy were used to locally image the coupled piezoelectric-magnetic switching. Quan…
Nanotechnology is expected to open new avenues to fight and prevent disease using atomic scale tailoring of materials. Among the most promising nanomaterials with antibacterial properties are metallic nanoparticles, which exhibit increased chemical activity due to their large surface to volume ratios and crystallograp…
We report that the measurements of the pyroelectric current of the pre-poled [111]-oriented 0.955 Pb(Zn 1/3 Nb 2/3 ) O 3 –0.045 PbTiO 3 (PZN-4.5%PT) single crystals can shed some light on the phase transition and spontaneous polarization characters of this material in a similar way to measures of remanent polarization…
The perovskite bilayers La 0.67 Ca 0.33 MnO 3 (LCMO) (100 nm) / La 0.67 Sr 0.33 MnO 3 (LSMO) (100 nm) and LSMO (100 nm) / LCMO (100 nm) are fabricated by a facing-target sputtering technique. Their transport and magnetic properties are investigated. It is found that the transport properties between them are different…
This study is presented on the frozen strain in XLPE measured by means of a thermomechanical analysis (TMA). The magnitude of the strain in XLPE insu lated cables ranges from 2 to 8 % and the cable insulation is stressed in tension for the axial and azimuthal directions and compression for the radial direction. Thermo…
An Au/α-Fe 2 O 3 −γ-Al 2 O 3 catalyst (0.96% (w/w) of Au and 4.8% of Fe 2 O 3 ) was tested for activity and selectivity in an isothermal flat-bed reactor. Very good activity and selectivity values were measured for different operation temperatures and compositions. The reaction rate parameters of carbon monoxide and h…
A figure of merit (FOM) Z = U p /τ r , where U p is the peak voltage, and τ r is the rise time of the laser-induced thermoelectric voltage (LITV) signal, is defined for photodetector based on the LITV and the influence of the parameters on FOM is analysed based on the time dependence of LITVs in La 1− x Ca x MnO 3 (LC…