Materials Literature
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Oxide-supported Au nanostructures are promising low-temperature oxidation catalysts. It is generally observed that Au supported on reducible oxides is more active than Au supported on irreducible oxides. Recent studies also suggest that cationic Au(delta+) is responsible for the unique Au/oxide catalytic activity, con…
The influence of post-sintering annealing on the dielectric properties of $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Ti}}_{4}{\mathrm{O}}_{12}$ was investigated in the temperature range form $200\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}400\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. A dielectric peak featu…
Motivated by the recent discovery of the experimental possibility to obtain two-dimensional (2D) crystals and the permanent interest in carbon materials, we perform a theoretical investigation of the stability and electronic properties of 2D graphite (graphene) and also of some new similar carbonic structures. Using t…
In recent years, the formation of thin, well-ordered but complex surface oxides on late transition metals has been discovered. The driving force for this line of research has been the strong incentive to increase the partial pressure of oxygen from ultra-high vacuum to conditions more relevant for heterogeneous cataly…
We demonstrate the kinetic arrest of the first-order phase transition from the high-temperature antiferromagnetic state to the ferromagnetic ground state in zero and low applied magnetic fields, occurring within the experimental time scale in the magnetocaloric material ${\mathrm{Gd}}_{5}{\mathrm{Ge}}_{4}$. A magnetiz…
The present study describes a stabilization of single quantum dot (QD) micelles by a "hydrophobic" silica precursor and an extension of a silica layer to form a silica shell around the micelle using "amphiphilic" and "hydrophilic" silica precursors. The obtained product consists of approximately 92% single nanocrystal…
A high-pressure sliding plate rheometer was used to determine the effects of supercritical fluids and pressure on the viscosity of molten high-density polyethylene (HDPE). In this instrument, the shear strain, temperature, pressure, and gas concentration are all uniform, and a shear stress transducer senses the stress…
We analyse the statistical distribution function for the height fluctuations of brittle fracture surfaces using extensive experimental data sampled on widely different materials and geometries. We compare a direct measurement of the distribution to a new analysis based on the structure functions. For length scales $δ$…
Spin-dependent coherent quantum transport through carbon nanotubes (CNT) is studied theoretically within a tight-binding model and the Green's function partitioning technique. End-contacted metal/nanotube/metal systems are modelled and next studied in the magnetic context, i.e. either with ferromagnetic electrodes or…
The relaxor ferroelectric $({\mathrm{PbMn}}_{1∕3}{\mathrm{Nb}}_{2∕3}{\mathrm{O}}_{3}{)}_{1\ensuremath{-}x}({\mathrm{PbTiO}}_{3}{)}_{x}$, $x=0.1$ [PMN/PT (90/10)], is found to exhibit several regimes of complicated aging behavior. Just below the susceptibility peak there is a regime exhibiting rejuvenation but little m…
We have studied photoluminescence and resonant Raman scattering of single-walled carbon nanotubes (SWNTs) consisting of carbon-13 $({\mathrm{SW}}^{13}\mathrm{CNTs})$ synthesized from a small amount of isotopically modified ethanol. There was almost no change in the Raman spectra shape for ${\mathrm{SW}}^{13}\mathrm{CN…
Discotic liquid crystals can self-align to form one-dimensional semiconducting wires, many tens of microns long. In this letter, we describe the preparation of semiconducting films where the stacking direction of the disc-like molecules is perpendicular to the substrate surface. We present measurements of the charge c…
A model describing the exchange-biased asymmetric giant magneto-impedance in Joule-heated amorphous wires is proposed. It is assumed that the Joule heating results in the formation of a surface hard magnetic crystalline layer, and the asymmetric giant magneto-impedance is related to the exchange coupling between the a…
Emphasizing the contribution of Professor Roger A Cowley, FRS to the Theory of Raman Scattering from crystals, the development of the Theory of Raman cattering since 1928 has been briefly discussed. Some experimental studies of Strontium Titanate using Inelastic Neutron Scattering, Raman Scattering, Electro- paramagne…
Regioregular polythiophene-based conductive copolymers with highly crystalline nanostructures are shown to hold considerable promise as the active layer in volatile organic compound (VOC) chemresistor sensors. While the regioregular polythiophene polymer chain provides a charge conduction path, its chemical sensing se…
In this communication, we demonstrate a new approach to sensitization of Ru-polypyridine complexes by using semiconductor nanocrystal quantum dots (NQDs). When mixed in solution, the complexes functionalized by carboxylic groups adsorb onto the surface of the NQDs. Excitation of NQDs by 400 nm light leads to fast, 5 p…
An oxidative chemical vapor deposition (CVD) process is presented as an alternative to conventional solution-based processing of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films. This solventless technique yields PEDOT with higher conductivities and conformally coats fibers and other high area morphologies, importa…
The electronic structure, defect chemistry, and transport properties of members of the mixed ionic electronic conducting SrTi 1 - x Fe x O 3 - y (STF) solid-solution system are revisited, and an improved defect chemical model is proposed in which Fe is considered to be one of the main constituents that shape the energ…
The x-ray crystal structure of a 194-kDa fragment from module 5 of the 6-deoxyerythronolide B synthase has been solved at 2.7 Angstrom resolution. Each subunit of the homodimeric protein contains a full-length ketosynthase (KS) and acyl transferase (AT) domain as well as three flanking "linkers." The linkers are struc…
Spherical silver nanoparticles with various sizes and standard deviations were synthesized by the polyol process. Two different synthesis methods were compared in order to investigate the influence of reaction parameters on the resulting particle size and its distribution. In the precursor heating method, wherein a so…