Materials Literature
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Abstract A new class of quinone derivatives, the dicyanodiimines 2 , 21 , and 23 , has been synthesized by the reaction of the corresponding quinones with bis(trimethylsilyl)carbondiimide ( 8 ) and titanium tetrachloride. A wide variety of substrates, even those which contain bulky groups and those which exhibit a str…
Optical emission spectroscopy was applied to study the rf glow discharge in hydrocarbons used for the deposition of amorphous hydrogenated carbon (a-C:H). The optical data in conjunction with mass spectrometric measurements show that the species found in the glow region are very specific for the hydrocarbon used (e.g.…
Absorption coefficients for some technologically important polymer materials are given in the wavelength range ∼240–170 nm. Absorption coefficients at 193 nm for these polymers show a wide range of values from ∼2×102 cm−1 for polytetrafluoroethylene (Teflon) to ∼4×105 cm−1 for polyimide. The general nature of the opti…
Molecular-dynamics simulations and in situ experimental observations of the melting and equilibrium structure of the crystalline Si(100)-melt interface are described. The equilibrium interface is structured, exhibiting facets established on (111) planes.
Light-scattering investigations in the temperature range from 10 to 850K have been performed on single crystals of silver niobate AgNbO 3 . The results are compared with structural and dielectric measurements revealing a complex sequence of phases. The Raman results and especially the strong central peak, which occurs…
Mixtures of poly(methyl methacrylate) and poly(α-methyl styrene) were prepared and their optical absorption coefficients at 193 nm were measured. A study of photoetching rate of these polymeric materials using an ArF excimer laser at 193 nm shows two regions of distinctly different etching characteristics. At relative…
The oxidation kinetics of HF-etched n- and p-doped silicon in air at room temperature have been studied by electron spectroscopy for chemical analysis. No great differences have been found between the n- and p-type oxidation kinetics at the low doping level of the studied samples. The rate of oxide growth on the HF-et…
Electrodes can be coated with electrochemically reactive polymers in several microstructural formats called sandwich, array, bilayer, micro-, and ion-gate electrodes. These microstructures can be used to study the transport of electrons and ions through the polymers as a function of the polymer oxidation state, which…
形状記憶合金を用いたアクチュエータの応答を改善する冷却の一方式が提案された.この方式のアルミニウム製のヒートシンクを用いることによって, 形状記憶合金の冷却速度が著しく増加することが示されている.またこのアクチュエータの性能及び制御法について検討を行った.
The coordination structure of ZnII ions in HCONH2–HCOONH4–ZnO solution, where the molar ratio of HCOONH4 and ZnO is ca. 2.0, has been investigated using EXAFS (extended X-ray absorption fine structure) and RDF (radial distribution function) methods. From both results we found that ZnII ions from mononuclear Zn(HCOO)2(…
The characteristics of Ag–Al2O3 films electrodeposited from silver thiocyanate solutions containing Al2O3 particles were investigated. The following results were obtained. As the amount of added Al2O3 particles was increased, the amount of Al2O3 codeposition in the Ag electrodeposited film increased, with a subsequent…
A eutectic alloy of GaSb-CrSb has been unidirectionally solidified at various rates of solidification, in order to investigate the structural change with the solidification condition.The results are as follows:(1) The spacing λ of CrSb rods was expressed to be linear to R−1⁄2, where R was the rate of solidification, a…
It has been reported that a unique polytype transformation (6H→4H) in the sintering process of SiC ceramics with BeO addition was observed by means of analytical electron microscopy, in which α-SiC powder was used as a starting material. In this report, the sintering process of β-SiC was investigated. It was expected…
In order to obtain highly conductive glass-ceramics containing vanadium bronze, MxV2O5 (M=alkali metal, etc), which is known to have high electronic conductivity, Na2O-V2O5-P2O5 glasses were heat treated to perform crystallization. The dc conductivities of the glasses containing 60 to 77mol% V2O5, in which [Na2O]/[V2O…
Relationship between wet adhesion of paint coating film (paint film) on coated steel (wet adhesion) and stress changes in paint film has been investigated. At the same time, the creation mechanism of ZnO under paint film has been examined.Zn3(PO4)2•4H2O under paint film dehydrates to Zn3(PO4) 2•2H2O with cathodic elec…
The effects of various additives on pH and rates of setting reactions of a commercial zinc phosphate cement system were examined. While the addition of various organic materials to the cement powderproduced no effect on the pH changes, addition of both calcium oxide and calcium hydroxide to the cement powder increased…
Powders containing perovskite type double oxides of the series Pb(Mg1/3Nb2/3)O3-Pb(Zn1/3Nb2/3)O3 as a main constituent have been prepared by firing the batch mixture according to the chemical formulae. It is interesting to know the substitutional solid solubility of ZnO for MgO in this series because the latter end me…
Each of the pale yellow title compounds (1), in toluene and other appropriate organic solvents, cyclises on irradiation at 366 nm to give purple solutions containing a mixture of a thermally unstable, blue 4-substituted 1,8a-dihydro-5,8-dimethoxy-1,1-dimethylnaphthalene-2,3-dicarboxylic anhydride (5) and a thermally s…
To improve an electrical capability of aluminum electrolytic capacitor, a new electrode material of large dielectric constant and high dielectric strength. This thin film electrode of titanium rich aluminum alloy is made with a rapid quench method and has very small grain size of a few micrometers and high toughness.…
The effect of colloidal silica on the [Ru(bpy)3]2+-sensitized photochemical cis-trans isomerization of N-methyl-4-β-styrylpyridinium (cis-MSP+) ion induced by one-electron transfer has been studied. An efficient electron-relay chain reaction has been shown to take place on the colloidal surface, on the basis of remark…