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859 results on '"Wakiya, Naoki"'

53. Fabrication and optical properties of Pb([Mg.sub.1/3][Nb.sub.2/3])[O.sub.3]-PbTi[O.sub.3] thin films on Si substrates using the PLD method

Author

Shinozaki, Kazuo, Hayashi, Shogo, Wakiya, Naoki, Kiguchi, Takanori, Tanaka, Junzo, Ishizawa, Nobuo, Sato, Keisuke, Kondo, Mas, and Kurihara, Kazuaki

Subjects
Ablation (Vaporization technology) -- Usage, Lead alloys -- Composition, Lead alloys -- Structure, Lead alloys -- Optical properties, Dielectric films -- Composition, Dielectric films -- Structure, Dielectric films -- Optical properties, Thin films -- Composition, Thin films -- Structure, Thin films -- Optical properties, Business, Electronics, Electronics and electrical industries
Abstract

Pulsed laser deposition (PLD) method was used for the preparation of epitaxially grown Pb ([Mg.sub.1/3][Nb.sub.2/3])[O.sub.3]-PbTi[O.sub.3] (PMN-PT) thin films on appropriate buffer layers deposited on a Si substrate. Findings reveal high crystallinity of PMN-PT film with full width at half maximum = 0.73 deg and 1.6 m thickness.

Published
2008

79. Optimization of synthesis conditions to prepare desired shell thickness of superparamagnetic MgFe2O4@SiO2 core-shell nanosphere for biomedical applications

Author

Sakamoto, Naonori, SHINOZAKI, KAZUO, Suzuki, Hisao, and Wakiya, Naoki

Abstract

We have described here a simple way for the fabrication of superparamagnetic MgFe2O4@SiO2 core-shell spherical nanoparticles with controlled shell thickness. First, core MgFe2O4 dense nanospheres were directly synthesized by ultrasonic spray pyrolysis (USP) technique from the aqueous metal nitrate precursor solution. Afterward, silica was coated on the obtained nanosphere for various desired shell thickness (10, 20 and 30 nm) by using theoretically calculated amount of tetraethyl orthosilicate (TEOS, as SiO2 precursor) and appropriate ratio of HCl (as acidic catalyst) via modified sol-gel approach. The effect of different shell thickness on the structural and morphological properties of core-shell nanospheres were detail studied by variuos characterization techniques. These results demonstrate that core-shell structure have only a single core MgFe2O which is homogeneously covered by dense amorphous silica layer with appropriate thickness. The measured shell thickness (∼ 10, 20 and 30 nm) by TEM image is almost same as our proposed shell thickness. TGA curves shows the better thermal stability of coated nanosphere and have shows higher monodispersibity for thin shell (∼ 10 nm) due to less agglomeration.

Published
2016

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