Materials Literature
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The kinetics of the oxidation of a series of substituted phenols by polyoxometalate (POM), K5[SiVW11O40] · 12H2O were investigated. Under all conditions studied second‐order kinetics were observed. Electron‐transfer from neutral phenols (k1) was slower than that from the corresponding phenoxide anions (k2), and the re…
Handling particle and heat loads on the plasma-facing in vessel components constitutes a major engineering problem in thermo-nuclear plasma devices. The choice of the plasma-facing materials is a crucial point in future devices, such as ITER (International Thermonuclear Experimental Reactor), which will determine the…
Abstract ZnO:Mn semiconductor quantum dots were prepared by solution casting led microemulsion route. Quantum dots of average size ∼2 nm were noticed in transmission electron micrographs. The present work highlights colour change phenomena (photochromic effect) of quantum dots while subjected to photon illumination. T…
Fe-substituted manganites Bi0.5Sr0.5FexMn1−xO3 (0⩽x⩽1.0) were synthesized by a solid-state reaction. X-ray powder diffraction and neutron diffraction investigations performed at room temperature show that the crystal structure is orthorhombic for x⩽ 0.3 and cubic for x>0.4. The unit cell volume increases with x…
Free carbon nanopearl layer cathodes have already proved to be good emitters under poor vacuum conditions. In order to improve the cathode reliability and the cost of fabrication, a new design of nanopearl field emitter has been developed wherein the nanopearls are suspended and protected in a polymer matrix. A polyme…
Comparative studies of the photoluminescence and electroluminescence of multilayer structures with self-assembled Ge(Si)/Si(001) islands are carried out. The luminescence signal from the islands is observable up to room temperature. Annealing of the structures induces a shift of the luminescence peak to shorter wavele…
Abstract The reactions of hexachlorocyclotriphosphazene N 3 P 3 Cl 6 ( 1 ) with 1‐naphthol and 1‐naphthylamine have been examined. The reaction of 1 with sodium 1‐naphthoxy gave the hexakis(1‐naphthoxy)cyclotriphosphazene ( 2 ) in high yield. Geminal 2,2‐di(1‐naphthylamino)‐4,4,6,6‐tetrachlorocyclotriphosphazene ( 3 )…
We fabricate p-type conductive ZnO thin films on quartz glass substrates by codoping of In-N using radio frequency magnetron sputtering technique together with the direct implantation of acceptor dopants (nitrogen). The effects of thermal annealing on the structure and electrical properties of the ZnO films are invest…
This paper presents a new carbon nanotube transistor (CNT) modelling technique which is based on an efficient numerical piece-wise non-linear approximation of the non-equilibrium mobile charge density. The technique facilitates the solution of the self-consistent voltage equation in a carbon nanotube such that the CNT…
An electrostatic self-assembled multilayer film has successfully been prepared by alternating adsorption of a wheel-shaped nanoporous isopolyoxomolybdate and a bipolar hemicyanine derivative, as monitored by absorption spectroscopy. The square roots of second-harmonic intensities of the film exhibit quadratic dependen…
A dipolar Ru(II) complex, [(bpy)2Ru(bpbh)Ru(bpy)2](ClO4)4 {where bpbh = 1,6-bis-[2-(2-pyridyl) benzimidazoyl]hexane, bpy = 2,2'-bipyridine}, was synthesized and characterized. A multilayer film of at least 18 layers was successfully prepared by alternating adsorption of H4SiW12O40 and [Ru2(bpy)4(bpbh)](ClO4)4 by elect…
The effect of punch density, depth of needle penetration, fibre orientation and area density of jute needle-punched nonwoven fabric, for use as reinforcing material in jute-reinforced plastic (JRP) composite, has been studied and the composite properties, such as tensile strength and modulus, flexural strength and mod…
Using derived equations for the potential description for carbon nanotube field effect transistors (CNT-FETs), basic semiconductor equations for carbon nanotubes have been used to model the charge transport. The carbon nanotube has been modeled as a line of charge, and a numerical model has been implemented for the cu…
The fuzzy frontiers between structure determination by powder diffractometry and crystal structure prediction are discussed. The application of a search-match program combined with a database of more than 60 000 predicted powder diffraction patterns is demonstrated. Immediate structure solution (before indexing) is sh…
The internal stress in solid-oxide fuel cells (SOFCs) was evaluated during the thermal, reduction and re-oxidation cycles by using high-energy X-ray synchrotron radiation of about 70 keV at Beam line BL02B1 of SPring-8. The oxidized cell has a compression of about 400 MPa in the c-ScSZ electrolyte and a tension of 50-…
Ca-Pb(Zr,Ti)O3 (Ca-PZT) powders were prepared by a combined method, Pechini technique for the intermediate ZrTiO4 (ZT) particles and oxalate route for the final powder. The intermediate and final products were characterized by X-ray diffraction and BET for phase identification and granulometric analysis, respectively.…
This work deals with reaction of alkyl halides with carbon disulfide in the presence of basic alumina as heterogeneous and reusable reagent. It afforded symmetrical dialkyl trithiocarbonate in moderate to excellent isolated yields. Reaction of 1,2‐dichloro ethane with carbon disulfide also proceeded in a similar manne…
We report on the encapsulation of cobalt phthalocyanine (CoPc) molecules in double and multi-walled carbon nanotubes. Transmission electron microscopy imaging confirms the filling and shows pristine outer walls after cleaning. We also discuss Co 2p photoemission results, which reveal that hybridization interaction wit…
A synthesis method based on a spiraling search algorithm is applied to design a low-loss normal-incidence wideband visible antireflection coating. The design algorithm of the spiraling search is straightforward and the resultant visible antireflection (AR) performance is fairly good. It was shown that the average visi…
Red phosphor Sr2ZnSi2O7:Eu3+ nanoparticles with an average diameter of 20 nm were successfully synthesized via a low-temperature hydrothermal route in order to understand the underlying relationship between size and luminescent properties. The nanometer-sized particles result in a distinct improvement in chromaticity…