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RISS 인기검색어
- 검색키워드
- 저자 : Mitsunobu Iwasaki (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Fabrication of La2O3-TiO2-SiO2 System Glass Derived from a Sol-Gel Process
Mitsunobu Iwasaki,Hitoshi Masaki,Seishiro Ito,박원규 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.3
La2O3-TiO2-SiO2 glass, a type that could not obtained so far by the conventional melting method, was prepared successfully using a sol-gel process. Glass derived with the sol-gel process has compositions of 5La2O3-5TiO2-90SiO2, 5La2O3-10TiO2-85SiO2, and 5La2O3-20TiO2-75SiO2. The UV-visible absorption edge of all glass compositions was below 400 nm. The measured density is in the range of 2.55-2.89, and was nearly identical to the calculated density and the refractive index of the glasses derived from the sol-gel ranges from 1.545 to 1.645. The molar additive coefficient of TiO2 measured in this ternary system is lower than the calculated value, while the value of La2O3 is higher.
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Iwasaki, Mitsunobu,Masaki, Hitoshi,Ito, Seishiro,Park, Won-Kyu The Korean Ceramic Society 2007 한국세라믹학회지 Vol.44 No.3
$La_{2}O_{3}-TiO_{2}-SiO_{2}$ glass, a type that could not obtained so far by the conventional melting method, was prepared successfully using a sol gel process. Glass derived with the sol-gel process has compositions of $5La_{2}O_{3}-5TiO_{2}-90SiO_{2},\;5La_{2}O_{3}-10TiO_{2}-85SiO_{2}$, and $5La_{2}O_{3}-20TiO_{2}75SiO_{2}$. The UV-visible absorption edge of all glass compositions was below 400 nm. The measured density is in the range of 2.55-2.89, and was nearly identical to the calculated density and the refractive index of the glasses derived from the sol-gel ranges from 1.545 to 1.645. The molar additive coefficient of $TiO_{2}$ measured in this ternary system is lower than the calculated value, while the value of $La_{2}O_{3}$ is higher.
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Preparation of BaTiO<sub>3</sub> Thick Film by an Interfacial Polymerization Method
Iwasaki, Mitsunobu,Park, Won-Kyu Materials Research Society of Korea 2007 한국재료학회지 Vol.17 No.10
[ $BaTiO_3$ ] thick film by an interfacial polymerization method was prepared at the liquid/liquid interface between benzyl alcohol saturated solution with the basic catalyst [diethyl amine ($NHEt_2$) or triethylamine ($NEt_3$)], and the water dissolved with $TiO_2$ and $Ba(CH_3COO)_2$. The film thickness increased gradually with an increase in diethyl amine($NHEt_2$) or triethylamine($NEt_3$) volume and the reaction time. The homogeneity of $BaTiO_3$ thick film after sintered at $600^{\circ}C$ was confirmed by EPMA analysis, which showed that both of Ba and Ti element were homogeneously distributed on the surface as well as in the perpendicular direction of the film. The thickness of $BaTiO_3$ film obtained by this process was $8.75\;{\mu}m$.
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Yoshikazu Matsui,Hiroshi Horikawab,Mitsunobu Iwasaki,박원규 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Nanometre-sized yttrium aluminum garnet doped with Ce3+ (YAG : Ce) crystals were prepared at a low temperatures by use of an environmentally-friendly wet process, in which an alcohol-water mixture with metal salts is refluxed without any addition of surfactants or adsorbing ligands. All of the YAG : Ce particles with 0.1-10 mol% of Ce3+ ions were found to be nanocrystals. YAG : Ce nanocrystals emitted at a 532 nm wavelength with the excitation light at 454 nm. The highest quantum efficiency was achieved at a very small Ce3+ content of 0.3 mol %. The decay curve of the fluorescence consisted of the three exponential terms, and the average fluorescence lifetime was around 110 ns irrespective of the Ce3+ concentration.
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Characteristics of apatites as a disperse phase for solid-phase organic oxidation system
Yoh Sasaki,Katsuma Iteya,Mitsunobu Iwasaki,Seishiro Ito,Junko Ichihara 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.1
In the novel solid phase system consisting of cetylpyridinium dodecatungstate (CetylPy10[H2W12O42]) catalyst/ solid oxidant (urea-H2O2)/ apatite disperse phase, the O-insertion reaction (epoxidation) of C=C double bond of cyclooctene proceeds at powdery solid state in the absence of organic solvents without stirring at room temperature. In the system, the formation of the epoxide was affected by various forms of hydroxyapatite powders (HAps) used as a solid disperse phase. The high crystallinity and low surface area of HAp and the uniform size of spherical particles of HAp were found to be important factors as an effective solid disperse phase for assisting the epoxidation. The factors were quite different from those of common solid supports used for fixing the catalyst in liquid-solid heterogeneous reactions. Taking account of the kinetic behavior in the solid-phase-epoxidation system, key points for promoting the reaction are considered to be the diffusion of liquid reactant and its proximity to the active catalyst. The effective forms of apatites might have advantages in these points. In the novel solid phase system consisting of cetylpyridinium dodecatungstate (CetylPy10[H2W12O42]) catalyst/ solid oxidant (urea-H2O2)/ apatite disperse phase, the O-insertion reaction (epoxidation) of C=C double bond of cyclooctene proceeds at powdery solid state in the absence of organic solvents without stirring at room temperature. In the system, the formation of the epoxide was affected by various forms of hydroxyapatite powders (HAps) used as a solid disperse phase. The high crystallinity and low surface area of HAp and the uniform size of spherical particles of HAp were found to be important factors as an effective solid disperse phase for assisting the epoxidation. The factors were quite different from those of common solid supports used for fixing the catalyst in liquid-solid heterogeneous reactions. Taking account of the kinetic behavior in the solid-phase-epoxidation system, key points for promoting the reaction are considered to be the diffusion of liquid reactant and its proximity to the active catalyst. The effective forms of apatites might have advantages in these points.
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