Materials Literature
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Classification of glass-forming liquids based on the dramatic change in their properties upon approach to the glassy state is appealing, since this is the most conspicuous and often-studied aspect of the glass transition. Herein, we show that a generalized scaling, log (tau) proportional, variant T-1 V-gamma, where ga…
The comparative investigation of pyroelectric response modulation frequency dependences of structures of "polar active film-Si substrate" type based on PZT and PVDF and of structures of "polar active film - buffer layer - Si substrate" type based on PZT and porous silicon (por-Si) has been carried out. By photopyroele…
Hysteresis effects of the fundamental energy gap as a function of applied magnetic field are studied for metamagnetic EuSe layers grown by molecular-beam epitaxy. Below the phase transition temperature, the energy gap show large step-like red shifts of up to 150meV with increasing magnetic field with pronounced hyster…
The photovoltaic effect (PVE) of a heterojunction composed of a La0.7Ce0.3MnO3 (LCE) film and a 0.5wt.% Nb-doped SrTiO3 crystal has been experimentally studied. A strong PVE was observed, and the maximum photovoltage was ∼54.1mV, when the LCE film was exposed to light with a wavelength (λ) of 460nm and a power of ∼6.5…
Al 0.49 Ga 0.51 N ∕ Al 0.16 Ga 0.84 N distributed Bragg reflectors (DBRs), designed for the ultraviolet spectral region, are reported. The crack-free structures are grown on sapphire substrates by metalorganic chemical vapor deposition. A peak reflectivity of 91% at 353nm with a stop-band width of 17nm was obtained at…
Fusion reactors create extreme conditions for structures close to the plasma. It seems unlikely that materials currently being considered can meet all performance requirements under such conditions. We explore the possibility of separating functionality in composite structures to overcome this barrier. To this end, se…
Vertically aligned nanocluster wires (NCWs) were synthesized on indium-tin-oxide-coated glass substrates via the thermal decomposition of Fe(CO)5 with a resistive heater under a magnetic field. The density of the aligned NCWs was controlled by varying the flow rate of the carrier gas. The low-density NCWs showed bette…
Segregation of the cation substitution defects Ba 2+ , Sr 2+ , Ce 4+ and Zr 4+ to the stable low index surfaces of UO 2 has been predicted using atomistic simulation techniques. While Ce 4+ and Zr 4+ substitute simply for U 4+ , charge compensation in the form of oxygen vacancies is required in the case of Ba 2+ and S…
Phase transformations in 2xxx series aluminium alloys (Al–Cu–Mg) are investigated with an off-lattice atomistic kinetic Monte Carlo simulation incorporating the effects of strain around misfitting atoms and vacancies. Atomic interactions are modelled by Finnis–Sinclair potentials constructed for these simulations. Vac…
Thin films of poly(methylsilsesquioxane) (PMSSQ) are candidates for use as interdielectric layers in advanced semiconductor devices with multilayer structures. We prepared thin films of PMSSQ with thicknesses in the range 25.0-1151.0 nm by spin-casting its soluble precursor onto Si and GaAs substrates with native oxid…
An aspherical ion model (AIM) is constructed for lithium oxide, Li 2 O. The model incorporates both many-body polarization and short-range ion distortion effects. A procedure for extracting the required model parameters by fitting to results from a series of electronic structure calculations is described. The model is…
A series of three novel liquid crystalline amphiphilic molecules is reported which are composed of three incompatible molecular parts, a rigid terphenyl core, two lipophilic decyloxy chains in the terminal 4- and 4' '-positions, and a polar group in the lateral 2'-position. The polar group comprises a polyether chain,…
We combine theoretical and experimental results to study percolation-driven transport phenomena in an irradiated material. We show that whereas the first transition takes place at the value of amorphous fraction , the second transition corresponds to the percolation of depleted phase. The knowledge of the radius of de…
The citM gene from Lactococcus lactis CRL264 was demonstrated to encode for an oxaloacetate decarboxylase. The enzyme exhibits high levels of similarity to malic enzymes (MEs) from other organisms. CitM was expressed in Escherichia coli, purified and its oxaloacetate decarboxylase activity was demonstrated by biochemi…
The dynamics of a soft sphere model glass, studied by molecular dynamics, is investigated. The vibrational density of states divided by ω 2 shows a pronounced boson peak. Its shape is in agreement with the universal form derived for soft oscillators interacting with sound waves. The excess vibrations forming the boson…
Molybdenum and cobalt based heteropolyanions (HPAs) could be used as an alternative to the conventional ammonium heptamolybdate and cobalt nitrate starting materials for friendly environmental preparation of Co-Mo/Al2O3 hydrotreating catalysts. In this aim, cobalt salts of molybdocobaltate and molydboaluminate Anderso…
We report single dot spectroscopy of hexagonal GaN∕AlN self-assembled quantum dots grown by metalorganic chemical vapor deposition. Through the reduction of the number of quantum dots using submicron mesa structures, we have obtained several isolated photoluminescence peaks emitted by individual quantum dots. With inc…
Silica mesoporous films have been synthesized via Evaporation Induced Self-Assembling (EISA) using Pluronic F-127 as a templating agent and mesostructures with Fmmm orthorhombic symmetry have been obtained. An optimized thermal process to stabilize the silica walls has been used; the silica films exhibited an excellen…
We present an x-ray reflectivity study of wetting at the free surface of the binary liquid metal gallium-bismuth (Ga-Bi) in the region where the bulk phase separates into Bi-rich and Ga-rich liquid phases. The measurements reveal the evolution of the microscopic structure of wetting films of the Bi-rich, low-surface-t…
We present x-ray reflectivity measurements from the free surface of a liquid gallium-bismuth alloy (Ga-Bi) in the temperature range close to the bulk monotectic temperature $T_{mono} = 222$C. Our measurements indicate a continuous formation of a thick wetting film at the free surface of the binary system driven by the…