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Yoshikazu Miyake - One of the best experts on this subject based on the ideXlab platform.
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Preparation and Separation Properties of Spherical Mesoporous Silica Particles
Journal of the Society of Powder Technology Japan, 2006Co-Authors: Yoshikazu MiyakeAbstract:This paper describes the preparation methods of spherical Mesoporous particles. Spherical Mesoporous Silica particles of about 0.5mm diameter were prepared from templates of tetrabutoxysilane oil droplets dispersed in alkali solution with cationic surfactant. The nanostructure was the reversed MCM41. Several organic compounds were solubilized in the surfactant of the as-synthesized Mesoporous Silica particles. The solubilized quantity increased with the hydrophobicity of organic compounds. The solutes with different sizes can be separated using a column packed with calcined-spherical particles. The spherical Mesoporous Silica particles of about 1μm diameter can also be prepared by using lauryl amine as the basic catalyst and template. The spherical Mesoporous Silica particles were regularly arrayed on a glass plate coated with titania.
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Solubilization of organic compounds into as-synthesized spherical Mesoporous Silica
Physical Chemistry Chemical Physics, 2002Co-Authors: Yoshikazu Miyake, Toshimi Yumoto, Kitamura H, Taichi SugimotoAbstract:Spherical Mesoporous Silica was prepared by dispersing tetrabutoxysilane (TBOS) in an alkaline solution into which a cationic surfactant had been dissolved. The spherical Mesoporous Silica was prepared within the limited concentration regions of the surfactant. The diameter of the spherical Mesoporous Silica was about 500 μm, and the BET specific surface area was above 1000 m2 g−1. Within the as-synthesized spherical Mesoporous Silica, phenol and some organic compounds in aqueous phase were solubilized into the hydrophobic free space consisting of the hydrocarbon group of surfactants. The extent of solubilization was correlated with equilibrium concentration in aqueous phase by a Langmuir-type equation. The maximum solubilization for phenol was proportional to the BET specific surface area of the calcined spherical Mesoporous Silica. For some organic compounds maximum solubilization was directly proportional to a hydrophobic index of the organic compound, log (POW), where POW is the distribution coefficient between the octanol and water phases.
Hyun Jong Kim - One of the best experts on this subject based on the ideXlab platform.
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TiO2 loaded Mesoporous Silica fiber for the photocatalytic application
Studies in Surface Science and Catalysis, 2004Co-Authors: Hyun Jong Kim, Yong-gun Shul, Haksoo HanAbstract:Abstract Mesoporous Silica fiber was synthesized by sol-gel process and centrifugal spinning method. The spinning process induced lattice contraction and also promoted the oderness of the Mesoporous structure. The fiber is 3–10 cm in length and optically transparent. TiO 2 was loaded on the Mesoporous Silica fiber by simple impregnation method. The volume of 1nm pore was decreased by the formation of TiO 2 particles in the meso-pores of Silica fiber. The TiO 2 /Mesoporous Silica fiber showed the absorption band around 300–350 nm which has been assigned to the crystalline TiO 2 phase. The photocatalytic activity of TiO 2 loaded Mesoporous Silica fiber was much higher than conventional TiO 2 /Mesoporous Silica powder and commercial TiO 2 (P-25). The Mesoporous Silica fiber seems to be promising support for the practical application of photocatalytic reaction.
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Preparation of Mesoporous Silica fiber matrix for VOC removal
Catalysis Today, 2002Co-Authors: Young Hwan Chu, Hyun Jong Kim, Yong-gun Shul, Keun Young Song, Kyeong Taek Jung, Kangtaek Lee, Moon Hee HanAbstract:Abstract A novel method for the preparation of the Mesoporous Silica fiber matrix was introduced for a removal of volatile organic compounds (VOCs). Paper making technology was applied to make a sheet of Mesoporous Silica fiber matrix. Reinforcing the Mesoporous Silica fiber with the ceramic fibers (50 wt.%) increased the mechanical strength of the matrix. Mesoporous Silica fibers using TMOS (tetramethoxysilane) as a Silica source and CTAC (cetyltrimethyl-ammoniumchloride) as a surfactant were drawn by the spinning method. The spinning process increased both the crystallinity and the fraction of mesopores (1.9 nm) of the fiber. As the spinning rate was increased both the crystallinity and the specific area of the Mesoporous Silica fiber increased, but the diameter of fiber decreased. We could control the size and morphology of Mesoporous Silica fiber matrix by changing the shape of substrates. This leads to easy fabrication of honeycomb-structured adsorbent which can be used for the VOC removal.
Yong-gun Shul - One of the best experts on this subject based on the ideXlab platform.
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TiO2 loaded Mesoporous Silica fiber for the photocatalytic application
Studies in Surface Science and Catalysis, 2004Co-Authors: Hyun Jong Kim, Yong-gun Shul, Haksoo HanAbstract:Abstract Mesoporous Silica fiber was synthesized by sol-gel process and centrifugal spinning method. The spinning process induced lattice contraction and also promoted the oderness of the Mesoporous structure. The fiber is 3–10 cm in length and optically transparent. TiO 2 was loaded on the Mesoporous Silica fiber by simple impregnation method. The volume of 1nm pore was decreased by the formation of TiO 2 particles in the meso-pores of Silica fiber. The TiO 2 /Mesoporous Silica fiber showed the absorption band around 300–350 nm which has been assigned to the crystalline TiO 2 phase. The photocatalytic activity of TiO 2 loaded Mesoporous Silica fiber was much higher than conventional TiO 2 /Mesoporous Silica powder and commercial TiO 2 (P-25). The Mesoporous Silica fiber seems to be promising support for the practical application of photocatalytic reaction.
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Preparation of Mesoporous Silica fiber matrix for VOC removal
Catalysis Today, 2002Co-Authors: Young Hwan Chu, Hyun Jong Kim, Yong-gun Shul, Keun Young Song, Kyeong Taek Jung, Kangtaek Lee, Moon Hee HanAbstract:Abstract A novel method for the preparation of the Mesoporous Silica fiber matrix was introduced for a removal of volatile organic compounds (VOCs). Paper making technology was applied to make a sheet of Mesoporous Silica fiber matrix. Reinforcing the Mesoporous Silica fiber with the ceramic fibers (50 wt.%) increased the mechanical strength of the matrix. Mesoporous Silica fibers using TMOS (tetramethoxysilane) as a Silica source and CTAC (cetyltrimethyl-ammoniumchloride) as a surfactant were drawn by the spinning method. The spinning process increased both the crystallinity and the fraction of mesopores (1.9 nm) of the fiber. As the spinning rate was increased both the crystallinity and the specific area of the Mesoporous Silica fiber increased, but the diameter of fiber decreased. We could control the size and morphology of Mesoporous Silica fiber matrix by changing the shape of substrates. This leads to easy fabrication of honeycomb-structured adsorbent which can be used for the VOC removal.
Moon Hee Han - One of the best experts on this subject based on the ideXlab platform.
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Preparation of Mesoporous Silica fiber matrix for VOC removal
Catalysis Today, 2002Co-Authors: Young Hwan Chu, Hyun Jong Kim, Yong-gun Shul, Keun Young Song, Kyeong Taek Jung, Kangtaek Lee, Moon Hee HanAbstract:Abstract A novel method for the preparation of the Mesoporous Silica fiber matrix was introduced for a removal of volatile organic compounds (VOCs). Paper making technology was applied to make a sheet of Mesoporous Silica fiber matrix. Reinforcing the Mesoporous Silica fiber with the ceramic fibers (50 wt.%) increased the mechanical strength of the matrix. Mesoporous Silica fibers using TMOS (tetramethoxysilane) as a Silica source and CTAC (cetyltrimethyl-ammoniumchloride) as a surfactant were drawn by the spinning method. The spinning process increased both the crystallinity and the fraction of mesopores (1.9 nm) of the fiber. As the spinning rate was increased both the crystallinity and the specific area of the Mesoporous Silica fiber increased, but the diameter of fiber decreased. We could control the size and morphology of Mesoporous Silica fiber matrix by changing the shape of substrates. This leads to easy fabrication of honeycomb-structured adsorbent which can be used for the VOC removal.
Taichi Sugimoto - One of the best experts on this subject based on the ideXlab platform.
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Solubilization of organic compounds into as-synthesized spherical Mesoporous Silica
Physical Chemistry Chemical Physics, 2002Co-Authors: Yoshikazu Miyake, Toshimi Yumoto, Kitamura H, Taichi SugimotoAbstract:Spherical Mesoporous Silica was prepared by dispersing tetrabutoxysilane (TBOS) in an alkaline solution into which a cationic surfactant had been dissolved. The spherical Mesoporous Silica was prepared within the limited concentration regions of the surfactant. The diameter of the spherical Mesoporous Silica was about 500 μm, and the BET specific surface area was above 1000 m2 g−1. Within the as-synthesized spherical Mesoporous Silica, phenol and some organic compounds in aqueous phase were solubilized into the hydrophobic free space consisting of the hydrocarbon group of surfactants. The extent of solubilization was correlated with equilibrium concentration in aqueous phase by a Langmuir-type equation. The maximum solubilization for phenol was proportional to the BET specific surface area of the calcined spherical Mesoporous Silica. For some organic compounds maximum solubilization was directly proportional to a hydrophobic index of the organic compound, log (POW), where POW is the distribution coefficient between the octanol and water phases.