Materials Literature
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This paper discusses the effect of a F- impurity ion on the spectrokinetic parameters and the thermally stimulated luminescence of Gd2O2S-Tb(Ce) and Gd2O2S ceramics. A relationship is established between the absorption and excitation bands in the 330-380-nm region and the trapping centers responsible for the thermal p…
Stable hollow ZrO2–SiO2 spheres with mesopores in the shell wall have been successfully synthesized by a sol–gel process in an oil–water–oil microemulsion. The samples were characterized by transmission polarized light microscopy, SEM, TEM, and N2 adsorption–desorption isotherms. The characterization results indicate…
A systematic analysis for electrochemical polymerization of aniline, -toluidine (OTO), and -toluidine (MTO) ternary components on an indium-tin oxide (ITO) electrode was performed. Using an experimental design of mixture, empirical models are fitted and plotted as contour diagrams, which facilitate revealing the syner…
アルミドロスを原料として，無機陰イオン交換体の一種であり層状複水酸化物構造を有するハイドロタルサイトの合成を行った．得られた反応生成物に対して，結晶構造，表面構造，熱重量変化などの物性，pH緩衝作用，リン酸イオンの除去能力について検討した．ハイドロタルサイトの合成は，アルミドロスおよびMgCl2含有廃液を用いてAlとMgの複水酸化物の共沈法により行った．反応生成物には少量のSiO2, Al2O3, Fe2O3などが不純物として残存していた．得られた反応生成物の層間距離は約0.3 nmであった．ハイドロタルサイトを773 Kで3 h焼成するとMg–Al酸化物に変化し，焼成後に再水和操作を行うと再びハイドロタルサイトに復元した．反応生…
The length of fuzz and pill formed on regenerated cellulosic knitt fabrics after washing and drying (WD) was determined by electrical resistivity measurements perpendicular to the plane of fabric. The fuzz length of Lyocell Knitted Fabric 1 after 25 times WD was 1.05 mm and was the longest among the three different ly…
Thin films of (x)GeO2:(1-x)SiO2, 0 </= x </= 0.4, were fabricated via the sol-gel technique. Many applications of optics and photonics can benefit from the knowledge of the optical dispersion relationship of this ubiquitous binary ceramic material. The optical properties of the homogeneous and amorphous silica-based f…
Optical properties of Eu doped LiCaAlF6 and LiSrAlF6 crystals grown by Czochralski technique were investigated in vacuum ultraviolet using synchrotron radiation. The 5d→4f and 4f→4f emissions from Eu2+ and Eu3+ ions, respectively, were detected under excitation due to the inter-configurational 4f7→4f65d and 4f6→4f55d…
The new hybrid organic–inorganic copper oxovanadium phosphates of composition Cu4(bipy)4V4O11(PO4)2·nH2O (n ∼ 5) (1) and Cu2(bipy)2V2P2O12 (2) (bipy = 2, 2′-bipyridine) adopting the triclinic symmetry were obtained by soft hydrothermal routes. Both structures present different oxovanadium phosphate anionic units, resu…
Effect of deformation on damping capacity and microstructure of Fe–22%Mn–8%Co alloy has been investigated. The γ→ε stress-induced martensitic transformation occurs during deformation in the alloy. The amount of ε martensite increases rapidly up to 5% deformation, and gradually increases with further deformation. The d…
A dual-polarized frequency-tunable composite left-handed slab (CLS) is proposed. The CLS consists of periodic split-ring resonators (SRRs) along with thin wires. Two orthogonal SRR/wire arrays are utilized for dual-polarization purposes. Polarization-selectivity and frequency-tuning are achieved by means of on/off swi…
Selective chlorination of thiophene-2,3-dithiol with SO(2)Cl(2) generates the corresponding sulfenyl chloride, 2,3-C(4)H(2)S(SCl)(2). Subsequent condensation with Me(3)SiN(3) yields the thiophenodithiazolylium salt [C(4)H(2)S(3)N]Cl, [TDTA]Cl. The structure of the cation, TDTA+, was established by X-ray diffraction as…
We researched the possibilities for engineering the morphology of porous structures in n-InP. Lithographic patterning of the sample surface before anodic etching was shown to modify considerably the electric field distribution which, in its turn, defined the direction of pore growth inside the specimen. We show that l…
Delafossite-type CuYO 2 and CuY 1- x Ca x O 2 ( x ≤0.05) samples exhibited a green-PL-emission band due to the Cu + interconfiguration transition from 3d 9 4s 1 to 3d 10 at room temperature. With increasing Ca concentration, the Cu + emission shifted slightly to the shorter-wavelength side with a slightly weaker emiss…
Some of the applications of the electrochemical noise (ECN) technique in corrosion research as well as some of the promises and realities concerning the use of electrochemical noise analysis (ENA) are discussed. Perceived advantages of ENA include the ease of data collection and analysis. It is often assumed that the…
Catalytic elimination of formaldehyde (HCHO) was investigated over Cu-Al2O3 catalyst at room temperature. The results indicated that no oxidation of HCHO into CO2 occurs at room temperature, but the adsorption of HCHO occurs on the catalyst surface. With the increase of gas hourly space velocity (GHSV) and inlet HCHO…
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NMR studies have revealed the fundamental structure of natural rubber (NR) composed of the initiating terminal (ω-terminal), two trans-1,4 isoprene units, a long sequence of cis-1,4 isoprene units and the chain-end group (a-terminal). The functional ω- and α-terminal groups have been postulated to form branch-points b…
According to the measurement and data processing of partial discharges due to discrete water droplets on the surface of silicone rubber, phase characteristic of partial discharge for water droplets is obtained. And the change of silicone rubber surface structure by the Fourier Transform Infrared Spectroscopy (FTIR) is…
The optical properties of spherical gold nanoparticles are calculated using classical electrodynamics. The wavelength corresponding to maximum extinction shifts to longer wavelengths as the size of the nanoparticle is increased. The influence of higher-order multipoles is evident for large nanoparticles, making the sp…
Photoluminescence spectra and photoluminescence excitation spectra have been measured on samples of hexagonal boron nitride microcrystalline powder, cubic boron nitride single crystal, and boron nitride nanotubes (mixture of single-walled and multi-walled with some h-BN precursor). The reason for studying these 3 samp…