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RISS 인기검색어
- 검색키워드
- 저자 : Seishiro Ito (검색결과 4 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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Electrochemical Synthesis of TiO<sub>2</sub> Photocatalyst with Anodic Porous Alumina
Hattori, Takanori,Fujino, Takayoshi,Ito, Seishiro Materials Research Society of Korea 2007 한국재료학회지 Vol.17 No.11
Aluminum was anodized in a $H_2SO_4$ solution, and titanium (IV) oxide ($TiO_2$) was electrodeposited into nanopores of anodic porous alumina in a mixed solution of $TiOSO_4$ and $(COOH)_2$. The photocatalytic activity of the prepared film was analyzed for photodegradation of methylene blue aqueous solution. Consequently, we found it was possible to electrodeposit $TiO_2$ onto anodic porous alumina, and synthesized it into the nanopores by hydrolysis of a titanium complex ion under AC 8-9 V when film thickness was about $15-20{\mu}m$. The photocatalytic activity of $TiO_2$-loaded anodic porous alumina ($TiO_2/Al_2O_3$) at an impressed voltage of 9 V was the highest in every condition, being about 12 times as high as sol-gel $TiO_2$ on anodic porous alumina. The results revealed that anodic porous alumina is effective as a substrate for photocatalytic film and that high-activity $TiO_2$ film can be prepared at low cost.
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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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