ジルコニウムプロポキシドを用いた多孔質ガラスの化学修飾

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  • Chemical Modification of Porous Glass Using Zirconium Propoxide
  • ジルコニウム プロポキシド オ モチイタ タコウシツ ガラス ノ カガク シュ

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A porous glass specimen, having a mean pore diameter of 10nm, was prepared from fluorine containing sodium borosilicate glass. Two types of specimens (PG-S and PG-B) were impregnated with Zr-propoxide by the sol-gel method. PG-S had larger pores containing less residual silica-gel. PG-B had larger and smaller pores containing less and larger amounts of residual silica-gel, respectively. Zr-propoxide in pores was converted into Zr-oxide by drying at room temperature and heating at 500°C. These treatments of impregnation and conversion were repeated up to 5 times. ZrO2 was identified as tetragonal zirconia. The amount of anchored ZrO2 in pores increased with increasing number of the treatment. ZrO2 precipitated mainly in the larger pores and these larger pores decreased in pore size. Therefore, the inhomogeneous pore size distribution was adjusted to become homogeneous by the treatment with Zr-propoxide. The alkali resistance of porous glass specimens was improved by this chemical modification to some extent.

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