Materials Literature
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We report the observation of giant photoresistivity in electrochemically self-assembled CdS and ZnSe nanowires electrodeposited in a porous alumina film. The resistance of these nanowires increases by one to two orders of magnitude when exposed to infrared radiation, possibly because of real-space transfer of electron…
Large-scale copper nanowires have been fabricated by potentiostatic electrochemical deposition (ECD) of copper sulphate solution within the nanochannels of porous anodic alumina templates. Scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction and x-ray diffraction technique…
Many materials containing colloids or polymers are polydisperse: they comprise particles with properties (such as particle diameter, charge, or polymer chain length) that depend continuously on one or several parameters. This review focuses on the theoretical prediction of phase equilibria in polydisperse systems; the…
The structures of tungsten trioxide, WO 3 , have been studied in fine temperature steps, from room temperature to 1000 °C, by means of very high-resolution neutron powder diffraction. It was confirmed that the sample used was single-phase monoclinic in space group P 2 1 / n at room temperature. In addition to this mon…
Flexoelectric coefficient μ12 is greatly enhanced in the relaxor ferroelectric lead magnesium niobate ceramic. Phenomenological analysis suggests the high dielectric permittivity is inadequate to explain the great enhancement. Temperature dependent measurement reveals a close relation between the flexoelectric polariz…
We study Mode I fracture in a viscoelastic lattice model with a nonlinear force law, with a focus on the velocity and linear stability of the steady-state propagating solution. This study is a continuation both of the study of the piece-wise linear model in Mode I, and the study of more general nonlinear force laws in…
Upon cooling from its hexagonal high-temperature modification, AlPO4 (aluminium phosphate) tridymite successively transforms to several displacively distorted forms, including a normal structure-incommensurate-lock-in phase transition sequence. The space-group symmetries in this series are P112(1), P112(1)(alphabeta0)…
The structure of the hydrothermally synthesized compound AgCo3PO4(HPO4)2, silver tricobalt phosphate bis(hydrogen phosphate), consists of edge-sharing CoO6 chains linked together by the phosphate groups and hydrogen bonds. The three-dimensional framework delimits two types of tunnels which accommodate Ag+ cations and…
The crystal structure of (4,4'-dimethyl-2,2'-bipyridyl)tris[3,3,3-trifluoro-1-(2-thenoyl)propan-2-onato]europium(III), or more commonly (4,4'-dimethyl-2,2'-bipyridyl)tris(2-thenoyltrifluoroacetonato)europium(III), [Eu(C8H4F3O2S)3(C12H12N2)], has been determined. Crystals of the complex emit vivid red light when scratc…
Results are presented for the temperature dependence of the thermodynamic and conformational properties of cis-1,4 polyisoprene (PI) melts from detailed atomistic parallel-tempering end-bridging Monte Carlo (ptEBMC) simulations. The simulations have been performed with a C80 cis-1,4 PI melt system which was simultaneo…
We report density functional theory calculations of the interaction of Cu and Pd with the (0001) surface of α-Al2O3. The interaction of those metals with the oxide surface varies from covalent-like for the aluminum rich surface to ionic-like for the oxygen terminated surface. Stoichiometric hydroxylation of the surfac…
TEM images, UV-vis and SERRS (surface-enhanced resonance Raman scattering) spectra of two-dimensional assemblies of tetrapyridylporphine-derivatized Au nanoparticles (Au colloid-H 2 TPyP films) are reported. The films are prepared by a spontaneous 2-D reassembling of multilayer interfacial films on water surface and a…
Results are presented for the thermodynamic, conformational, and structural properties of cis-1,4 polyisoprene (PI) melts from detailed atomistic Monte Carlo simulations. All simulations have been executed by employing the very efficient end-bridging move, which alters chain connectivity and induces fast conformationa…
Cationic, neutral, and anionic arsenic and antimony halides formed binary arsenic and antimony azide species M(N(3))(4)(+), M(N(3))(4)(-), and M(N(3))(6)(-) (M = As, Sb) upon reaction with trimethylsilyl azide or sodium azide. The compounds were obtained as pure substances or salts, and their identity was established…
We have investigated the dynamics of confined water in a fully hydrated Na-vermiculite clay using the neutron spin-echo (NSE) technique. NSE measures the intermediate self-scattering function, i.e., the dynamics directly in the time domain. In the present experiments we performed measurements, in the time range 3–3000…
Gd-diethylenetriamine pentaacetic acid-bismethylamide, Gd(DTPA-BMA), is shown to be a reagent suitable for the identification of protein surfaces. Compared to the conventionally used spin-label TEMPOL, Gd(DTPA-BMA) is a stronger relaxation agent, requiring lesser concentrations to achieve the same paramagnetic relaxat…
This paper describes a computer simulation method and a computing model for electric field analysis of a vertically- aligned carbon nanotube (VACNT) system by means of an improved three-dimensional boundary charge method (3-D BCM). A real VACNT system where the number of CNTs is as large as ten millions per 1 mm<SUP>2…
In this paper we propose an improved three-dimensional (3D) boundary charge method (BCM) for a composite dielectric system in which insulators, i.e., dielectric materials exist together with conducting electrodes. The method is based on the idea that the composite dielectric system can equivalently be replaced with a…
Organic–inorganic hybrids of a cross-linked polyimide and silica were prepared via the sol–gel route using an acetylene-terminated oligomeric isoimide and tetraethoxysilane (TEOS) precursors. Two coupling agents, γ-mercaptopropyltrimethoxysilane (MPTMS), and triethoxysilane were employed to compatibilise the organic a…
Halohydrin dehalogenases are key enzymes in the bacterial degradation of vicinal halopropanols and structurally related nematocides. Crystals of the enantioselective halohydrin dehalogenase HheC from Agrobacterium radiobacter AD1 have been obtained at room temperature from hanging-drop vapour-diffusion experiments aga…