Materials Literature
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種々の鎖長の Rf 基を有するフルオロアルキルアクリレートポリマー[以下 PFA-Cy(y は Rf 基炭素数)と略]を合成し，表面分子鎖凝集構造と表面物性の鎖長依存性を静的，動的接触角，X 線光電子分光(XPS)，示差走査熱量分析，視射角入射 X 線回折(GIXD)測定などにより評価し，その撥水性発現機構を明らかにした．動的接触角測定において，後退接触角は炭素数 6 までは非常に低く，炭素数 8 以上で急激に増加した．GIXD 測定から炭素数 8 以上で Rf 基が秩序構造を形成すること，後退接触角は表面の環境応答性の指針となることから，以下の PFA-Cy 撥水性発現機構が提案される．すなわち，Rf 基の炭素数 8 以上では側…
The yield strength and electrical conductivity of precipitation-hardenable Cu-2.05mass%Ni-0.35mass%Be and Cu-1.27mass%Ni-0.22mass%Be alloys aged at 360 to 560°C after cold rolling have been investigated. The former alloy exhibits a higher strength and a lower electrical conductivity in the under-aging and peak-aging s…
We report a new cationic poly(phenylene ethynylene) (PPE) derivative that exhibits strong amplified fluorescence quenching in the presence of electron-deficient species, yielding high Stern-Volmer coefficients of 4.7 × 10 M in aqueous solutions. Importantly, with the addition of appropriate non-ionic surfactants, the…
Analyses of small-angle X-ray scattering (SAXS) and X-ray absorption fine structure (XAFS) were performed for characterizing precipitates formed in a Cu-3.1 at %Ni-1.4 at%Si alloy, the strength and electrical conductivity of which were improved by aging. SAXS profiles and XAFS spectra of samples aged at 720 K for diff…
The structural stability of A N B 8- N compounds such as GaAs, GaN, and NaCl is systematically investigated using our simple criterion on the basis of the ionicity, bond charge, and ionic charge of the A N B 8- N compounds. The criterion implies that the wurtzite structure is more stable than the zinc blende structure…
Mixtures of Pt clusters dispersed on gamma-Al(2)O(3) and additional gamma-Al(2)O(3) led to much higher DME combustion turnover rates than on the individual components or on Pt clusters supported on non-acidic oxides.
Cold plasma in the nanotechnology of catalysts In the paper the preparation of catalysts with the use of cold plasmas is discussed. A special attention is focused on nanocatalysts. In general, there are three main trends in this field: (1) plasma enhanced preparation of "classical" catalysts, (2) plasma sputtering of…
The major concern of the present paper is the numerical simulation of the flow and combustion of methane in a FLOX® combustor at high-pressure operating conditions. The purpose is to investigate the ability of the FLOX® concept to be used in a (micro) gas turbine combustor. FLOX® combustion is a highly turbulent and h…
The frequency profile of complex permeability (μr) and permittivity (εr) and their relationship with microwave absorbing properties are investigated in soft magnetic metal-polymer composite materials. The Fe-Si-Al alloy powder was forged by an attrition mill to get the flaky shape. The composite sheet was fabricated i…
The first BEDT-TTF charge transfer salt in which alternating electron-donor layers possess alpha- and kappa-type packing motifs has been synthesized. The crystal structure and physical properties of the organic conductor alpha-kappa-(BEDT-TTF)2Hg(SCN)3 are described, including a detailed description of its optical pro…
The synthesis, structure and characterization of the [{Fe3(CO)9(micro3-O)}2H]3- trianion in its [Cs(THF)0.33]+ and [NEt4]+ salt are reported. The title dimeric cluster has been obtained by protonation in water or in organic solvent of the [Fe3(CO)9(micro3-O)]2- dianion to the hydroxo [Fe3(CO)9(micro3-OH)]- derivative…
Nanocrystalline CaWO4 has been synthesized by a sol-gel method using tungsten (VI) oxide, WO3, and calcium nitrate tetrahydrate, Ca(NO3)2•4H2O as starting materials.The synthesis leads to a sol-gel process when citric or tartaric acids are introduced into the solution obtained by dissolving WO3 in ammonia.Citric and t…
The free dendrite growth of iron has been investigated using a three-dimensional phase-field model with thin-interface-limit parameters. The stability parameters are determined for different values of anisotropy intensity of interface energy, and the obtained values are in good agreement with previously reported value…
In this paper, a new sterilization method using cavitating flow is presented. Water with bacteria was pressurized up to 105 MPa and flushed out through two very small nozzles 0.1-0.31 mm in diameter, where a cavitating jet was generated containing bubbles that collapsed downstream. First, the effects of jet velocity a…
Cytocompatibility of nickel-free Ti-Mo-Al shape memory alloys was evaluated and compared with that of a conventional Ti-Ni shape memory alloy. Two types of cytotoxicity tests were performed; in static and dynamic conditions. In the static condition, human normal diploid fibroblast HEL299 was cultured on the disks of t…
The complexation reactions of 1 : 1 molar ratios of M(NO3)3·nH2O (M = Y, La–Pr, Sm–Lu) and pentaethylene glycol (EO5) in 3 : 1 CH3CN : CH3OH were investigated. Crystalline complexes were isolated for all metals investigated and X-ray structural analyses performed. The M(NO3)3–EO5 complexes structurally characterized a…
Chemical solution depostion of nanocrystalline Zn2SiO4:Mn on the biogenic silica frustule derived from the cultured marine diatom (Pinnularia sp.) is reported. Our deposition process uses rather simple chemistry that consists of only metal halides and water. Two types of nanostructures can be generated, depending upon…
Low Temperature Sintering of ZnO-Doped 0.01Pb(Mg1/2W1/2)O3–0.41Pb(Ni1/3Nb2/3)O3–0.35PbTiO3–0.23PbZrO3 Ceramics, Kim, Sang-Jong, Kang, Chong-Yun, Choi, Ji-Won, Kim, Hyun-Jai, Sung, Man-Young, Yoon, Seok-Jin
We report the successful electron-beam patterning of nanostructures, in the form of both lines and dots, using hydrogen silsesquioxane (HSQ) resist. Although HSQ has proven to be a good resolution electron-beam resist, the adhesion between and the HSQ resist is problematic when trying to form fine patterns. To promote…
Formation damage has been observed in several oil reservoirs and production equipment in Iranian oil fields. Laboratory and field testing confirmed that the primary cause of damage was the build-up of calcium carbonate, calcium sulfate and strontium sulfate scale either in the perforation tunnels or in the formation s…