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HWAHAK KONGHAK,
Vol.41, No.5, 617-623, 2003
Vol.41, No.5, 617-623, 2003
Sol-Gel법과 수열처리에 의한 단일 분포 기공을 갖는 Titania 나노 분말 제조
Preparation of Nano Size Titania Powders with Monomodal Pore Distribution by the Sol-Gel Method and Hydrothermal Treatment
Sol-Gel법에 의해 출발물질로 TTIP(titanium tetra-isopropoxide)를 사용하여 titania분말을 제조하였으며, 이 분말을 autoclave에서 수열처리하여 그 물성을 고찰하였다. 수열처리에 의해 얻어진 분말은 많은 나노기공을 갖고 있었으며, 아나타제의 결정상이 나타났다. Sol-gel법에 의해 제조한 후 400 ℃이상에서 열처리하여 얻어진 titania 분말은 1차 입자들 사이의 기공(intra-particle pores)과 2차 입자들 사이의 기공(inter-aggregated pores)이 공존하는 bimodal의 기공분포를 보이는 반면, 200 ℃에서 수열처리한 분말은 1차 입자들 사이의 기공만 존재하는 monomodal의 기공분포를 나타내었으며, 크기도 매우 작아졌고(40-50 nm), 비표면적의 증가(50-100%)와 분말의 응집도 감소(30-40%)등 물성의 괄목할 만한 향상을 가져왔다.
Titania powders were prepared from titanium tetra-isopropoxide (TTIP) by a sequence of sol-gel method and hydrothermal treatment. The powders made by sol-gel method followed by hydrothermal treatment exhibited an anatase crystalline phase with numerous nano-size pores. The pore size distribution of the powders prepared by sol-gel method and calcination above 400 ℃ was bimodal with fine intra-particle pores (space between primary particles) and larger inter-aggregated pores (space between secondary particles). The powders by the hydrothermal treatment at 200 ℃ showed a monomodal pore size distribution with only intra-particle pores. The properties of titania powders could be improved by means of hydrothermal treatment considerably; the size could be reduced to 40-50 nm, specific surface area could be increased by 50-100% and the ratio of agglomeration could be reduced by 30-40%.
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