Electrochemical evidence of H' produced by ultrasound.
Electrochemical evidence of H. produced by cavitation as the result of ultrasonic irradiation of an aqueous solution is presented.
Materials Literature
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Tungsten Disulphide Sheathed Carbon Nanotubes
An insulated nanotube wire is formed by the binary phase of layered tungsten disulphide and carbon nanotubes (shown in the HRTEM image) generated by the sulphidization of tungsten oxide coated multiwalled carbon nanotubes at 900 °C. Thermogravimetric analysis shows that the tungsten disulphide coat acts as an antioxid…
Artificial chaperone mediated refolding of xylanase from an alkalophilic thermophilic Bacillus sp.
To gain insight into the molecular aspects of unfolding/refolding of enzymes from extremophilic organisms, we have used xylanase from an alkalophilic thermophilic Bacillus as the model system. Kinetics of denaturation/renaturation were monitored using intrinsic fluorescence studies. The protein fluorescence measuremen…
Structural and electronic properties of semiconductor binary microclustersAmBn(A,B=Si,Ge,C): A B3LYP-DFT study
Structural and electronic properties of semiconductor binary microclusters ${A}_{m}{B}_{n}$ $(A,B=\mathrm{S}\mathrm{i},\mathrm{G}\mathrm{e},\mathrm{C})$ have been investigated using the B3LYP-DFT method in the range $s=m+n<~10.$ Full structural optimization and frequency analyses are performed with the basis of $6\…
Improved diffusion barrier by stuffing the grain boundaries of TiN with a thin Al interlayer for Cu metallization
A laterally segregated diffusion barrier was investigated for Cu metallization. In this scheme, the intended final structure is composed of two different barrier materials; one is the parent barrier layer (TiN, in our case) and the other (Al2O3, in this case) is segregated laterally along the grain boundaries of the p…
Large, continuously controllable nematic pretilt from vertical orientation
A polyimide that is designed to produce homeotropic liquid-crystal orientation is baked at high temperature and rubbed with a cotton cloth. It is found that the resulting pretilt angle of the liquid-crystal pentylcyanobiphenyl is continuously controllable from 0° to nearly 40°.
Monte Carlo simulation of polymer brushes in narrow pores
We present the model of a cylindrical pore with chains tethered by one end to its inner surface. The conformational and “quasistatic” (under low and medium shear rates) hydrodynamic properties of the system are studied. Since it was shown by other researchers that the density profile of the polymer layer is only sligh…
Size dependent magnetic phase of nanocrystalline Co0.2Zn0.8Fe2O4
Co 0.2 Zn 0.8 Fe 2 O 4 nanoparticles have been synthesized by the coprecipitation method. Nanoparticles with average particle size of 5–∼65 nm were obtained by sintering the samples from 393 to 1173 K. Magnetic measurements show that samples with particle size ⩽13 nm are superparamagnetic above the blocking temperatur…
Electrical properties of metal/porous silicon/p-Si structures with thin porous silicon layer
Porous silicon (PS) based metal/PS/p-Si structures with PS layer of different thickness were prepared on moderate- and high-resistivity substrates. Measurements of current–voltage (I–V) characteristics and impedance at various temperatures were used for the investigation of the electrical properties of these structure…
New Ways to Porous Monolithic Materials with Uniform Pore Size Distribution
Defined porosity in the low-nanometer range is exhibited by easy-to-modify template materials, which can be prepared from mesoporous polystyrene monoliths. These are readily accessible by a mild hydrolysis reaction of a poly(styrene-b-lactic acid) precursor (see picture)
Elastic constants from direct correlation functions in nematic liquid crystals: A computer simulation study
Density functional theories such as the Poniewierski–Stecki theory relate the elastic properties of \nnematic liquid crystals with their local liquid structure, i.e., with the direct correlation function \n~DCF! of the particles. We propose a way to determine the DCF in the nematic state from \nsimulations…
Enhanced ultraviolet photoconductivity in semiconducting ZnGa2O4 thin films
We have investigated the conductivity and photoconductivity response of undoped and Li-doped ZnGa2O4 epitaxial films grown using pulsed-laser deposition. A significant enhancement of the ultraviolet (UV) photoresponse is observed with Li doping that also correlates with an enhanced luminescent intensity. The wavelengt…
Preparation of Magnetic Nanoparticles and their Assemblies Using a New Fe(II) Alkoxide Precursor
Hydrolysis of the new metallorganic precursor Fe(OBut)2(THF)2 followed by ultrasound and thermal treatment yielded either nanoparticles of γ-Fe2O3 or Fe3O4, depending on the process conditions. The samples have been characterised by X-ray powder diffraction, TEM, SEM, Mössbauer spectroscopy and magnetization measureme…
Growth of fullerene-like carbon nitride thin solid films consisting of cross-linked nano-onions
Fullerene-like CNx (x≈0.12) thin solid films were deposited by reactive magnetron sputtering of graphite in a nitrogen and argon discharge on cleaved NaCl and Si(001) substrates at 450 °C. As-deposited films consist of 5 nm diam CNx nano-onions with shell sizes corresponding to Goldberg polyhedra determined by high-re…
Field emission from aligned carbon nanotubes prepared by thermal chemical vapor deposition of Fe-phthalocyanine
The field emission from aligned multiwalled carbon nanotubes prepared by thermal chemical vapor deposition of Fe-phthalocyanine is reported, with emphasis on the current–voltage characteristics and current fluctuation. By running of a pristine emitter at high current and/or voltage for a long time, the onset voltage i…
Rapid Communication : Completion of the Isomorphous Ln(trensal) Series
The CeIII, PrIII, NdIII, GdIII and YbIII complexes of the heptadentate ligand 2,2´,2´´-tris(salicylideneimino) triethylamine, H3trensal (in its trianionic form), have been synthesized and characterized structurally by X-ray crystallography. These five [Ln(trensal)] structures complete a rare isomorphous and isostructu…
Copper/Diamond Adhesion and Hydrogen Termination
The clean Cu/diamond(111) work of separation is found to be $1.30\mathrm{J}/{\mathrm{m}}^{2}$. Copper $d$ and diamond $p$ states play a significant role in forming relatively strong Cu/diamond interfacial bonds, while reconstruction of the free diamond(111) surface lowers the work of separation. The single dangling bo…
Effect of silicate layer anisotropy on cylindrical and spherical microdomain ordering in block copolymer nanocomposites
The influence of the addition of small quantities of anisotropic layered silicates on the ordering of block copolymers is studied by a combination of linear viscoelasticity and small angle neutron scattering. Specifically, we examine the influence of varying the lateral dimensions of thermodynamically roughly equivale…
Isotropic-nematic phase separation in asymmetrical rod-plate mixtures
Recent experiments on mixtures of rodlike and platelike colloidal particles have uncovered the phase behavior of strongly asymmetrical rod-plate mixtures. In these mixtures, in which the excluded volume of the platelets is much larger than that of the rods, an extended isotropic (I)–plate-rich nematic (N−)–rod-rich ne…
Crystallization kinetics of sputter-deposited amorphous AgInSbTe films
AgInSbTe films have recently attracted considerable interest as advanced materials for phase change recording. For this application the determination of crystallization kinetics is of crucial importance. In this work the temperature dependence of structural and electrical properties of sputtered AgInSbTe films has bee…