Materials Literature
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At room temperature CO is adsorbed strongly on Cu+ sites (band at 2131 cm−1) whereas NO is preferably adsorbed on Cu2+ sites (band at 1882 cm−1). Coadsorption of CO and NO allows simultaneous and selective detection of both kinds of cations. This observation is used to follow the changes on the sample surface occurrin…
Tubular polypyrrole (PPy) doped with β-naphthalenesulfonic acid (β-NSA) was synthesized by a template-free method. SEM and TEM images proved the tubular morphology. It was found that the morphology of the resulting PPy-NSA was significantly affected by the concentration of β-NSA. When the concentration of β-NSA was in…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHydrothermal Processing of High-Quality Multiwall Nanotubes from Amorphous CarbonJose Maria Calderon Moreno and Masahiro YoshimuraView Author Information Materials and Structures Laboratory Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Jap…
Methods for the preparation of II-VI, III-V, and II-V as well as other compound semiconductor nanoparticles using main group single-molecular precursors have been developed. The work involves the design and synthesis of compounds containing all the elements required within the desired nanoparticulate material. Precurs…
The full structural characterisation of the highly deintercalated LixNi1.02O2 (x ≤ 0.30) phases has been performed. The structure of the Li0.30Ni1.02O2 phase was refined by the Rietveld method. The cationic distribution was found to be identical to that of the pristine material. A study of the Li//LixNi1.02O2 system a…
We have recently developed a geometric formulation of the stress field for an interacting quantum system within the local density approximation (LDA) of density functional theory (DFT). We obtain a stress field which is invariant with respect to choice of energy density. In this paper, we explicitly demonstrate this u…
We describe direct imaging measurements of a colloidal sphere's diffusion between two parallel surfaces. The dynamics of this deceptively simple hydrodynamically coupled system have proved difficult to analyze. Comparison with approximate formulations of a confined sphere's hydrodynamic mobility reveals good agreement…
The effects of electrode materials on space charge formation in low-density polyethylene (LDPE) have been investigated experimentally using the pulsed electroacoustic (PEA) technique. Common electrode materials used in either the laboratory or power cable industry were selected, i.e. aluminum, gold and carbon loaded c…
Three-dimensional highly ordered macroporous conducting polymer films were prepared using a self-assembled colloidal template based on poly(styrene) latex spheres. Poly(pyrrole), poly(aniline) and poly(bithiophene) were polymerised electrochemically and the polymer grown through the interstitial spaces between poly(st…
Chitosan-alginate polyelectrolyte complex (CS-AL PEC) is water insoluble and more effective in limiting the release of encapsulated materials compared to chitosan or alginate. Coherent CS-AL PEC films have been prepared in our laboratory by casting and drying suspensions of chitosan-alginate coacervates. The objective…
Typical paraelectric materials (e.g., SrTiO/sub 3/, KTaO/sub 3/, Ba/sub x/Sr/sub 1-x/TiO/sub 3/, x10 GHz) is of the order of 0.01 (at zero dc-bias field) at room temperature. Nevertheless, quite promising component and subsystem level devices are successfully demonstrated. Use of ceramic (bulk and thick film) ferroele…
Anode-supported solid oxide fuel cells with a thin film of yttria-stabilized zirconia (YSZ) as the electrolyte were fabricated. The cells were operated directly on pure methanol and on an equivolume mixture of ethanol and water over a range of temperatures. Power density achieved with methanol was between 0.6 W/cm 2 a…
The influence of exchange interaction between paramagnetic ions on the luminescence properties is investigated for Mn 2 + Mn 2 + , Cr 3 + Cr 3 + , Cr 3 + Gd 3 + , and Mn 2 + Gd 3 + pairs. Two effects are reported: shortening of the lifetime of the spin-forbidden emission and a shift of emission lines or bands…
Dynamic recrystallization (DRX) behavior was systematically examined in two commercial Mg–Al–Zn alloys in order to clarify the relationship between deformation conditions and the resulting microstructure. The materials were deformed by upset forging at temperatures ranging from 473 to 673 K at an initial strain rate o…
Copolymers of trimethylene carbonate and epsilon-caprolactone were synthesized and characterized with the aim of assessing their potential in the development of a flexible and slowly degrading artificial nerve guide for the bridging of large nerve defects. The effect of the monomer ratio on the physical properties of…
A ZnO thin film was deposited on a Si wafer having an oxidized SiO 2 layer using a chemical solution deposition process and was applied to a bottom-gate type thin film transistor (TFT). The films prepared by combined heating at 600° and 900°C exhibited typical enhancement-type TFT characteristics with electrons as car…
Thermal conductivity is one of significant physical properties of engineering materials. It has been confirmed through the thermal conductivity measurements of natural and synthetic materials, and from theoretical calculations that the theoretical conductivities of diamond, BN, SiC, BeO, BP and AlN are larger than 300…
The onset of pitting at single inclusions on aluminum 2024-T3 has been observed in the micrometer range by using a microelectrochemical cell in order to study the mechanisms by which intermetallic particles, particularly AlCuMg and AlCuFeMn, induce localized corrosion. The results showed that pitting started at only f…
A 1329-base pair clone isolated from a human placenta cDNA library contains a full-length 837-base pair coding region for a 31.9-kDa protein whose deduced primary structure exhibits high homology to consensus sequences found in other NMN adenylyltransferases. Northern blotting detected a major 3.1-kilobase mRNA transc…
Active centres have been designed on high-area, molecular sieve catalysts which, inter alia, can convert n-alkanes to n-alkanols and n-alkanoic acids, cyclohexane to cyclohexanol, cyclohexanone and adipic acid, and n-hexane to adipic acid all using either oxygen or air as oxidants. A number of one-step processes and s…