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2011•Journal of Yunnan Normal UniversityRequires access

Fabrication of Three-Dimensional Ordered Macroporous TiO_2/SiO_2 Composite by PMMA Colloidal Crystal Template

Ling Liu

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Abstract

A closed-packing colloidal crystals,composed of poly(methyl methacrylate) microspheres,were used as template to prepared three-dimensionally ordered macroporous(3DOM) TiO2/SiO2 composite by a soak-filtere-exhaust method.The synthesis process included a filling of a mixed sol of a water-soluble TiO2 nanocrystals,TEOS,ethanol,and water in the location of the interstitial space between colloidal PMMA spheres and then transformation of gel in situ as well as calcination treatment.The results of SEM show that the obtained spherical pores possess a 3D ordered array of hexagonal and square configuration with a uniform pore distribution and about 195 ±s nm of pore diameter.XRD and TEM show that anatase crystals with about 6~7 nm in size exist in the macroporous walls.

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A closed-packing colloidal crystals,composed of poly(methyl methacrylate) microspheres,were used as template to prepared three-dimensionally ordered macroporous(3DOM) TiO2/SiO2 composite by a soak-filtere-exhaust method.The synthesis process included a filling of a mixed sol of a water-soluble TiO2 nanocrystals,TEOS,ethanol,and water in the location of the interstitial space between colloidal PMMA spheres and then transformation of gel in situ as well as calcination treatment.The results of SEM show that the obtained spherical pores possess a 3D ordered array of hexagonal and square configuration with a uniform pore distribution and about 195 ±s nm of pore diameter.XRD and TEM show that anatase crystals with about 6~7 nm in size exist in the macroporous walls.

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Available abstract

A closed-packing colloidal crystals,composed of poly(methyl methacrylate) microspheres,were used as template to prepared three-dimensionally ordered macroporous(3DOM) TiO2/SiO2 composite by a soak-filtere-exhaust method.The synthesis process included a filling of a mixed sol of a water-soluble TiO2 nanocrystals,TEOS,ethanol,and water in the location of the interstitial space between colloidal PMMA spheres and then transformation of gel in situ as well as calcination treatment.The results of SEM show that the obtained spherical pores possess a 3D ordered array of hexagonal and square configuration with a uniform pore distribution and about 195 ±s nm of pore diameter.XRD and TEM show that anatase crystals with about 6~7 nm in size exist in the macroporous walls.

Key concepts: Materials science, Colloidal crystal, Anatase, Calcination, Composite number, Chemical engineering, Colloid, Fabrication

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Fabrication of Three-Dimensional Ordered Macroporous TiO_2/SiO_2 Composite by PMMA Colloidal Crystal Template — Research Paper | ScholarLens