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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
충남대학교 화학공학과, 305-764 대전시 유성구 궁동 220 1건양대학교 화학공학과, 320-711 충남 논산시 내동 26
School of Chemical Engineering, Institute of Nano-Technology and Advanced Materials, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Korea 1Department of Chemical Engineering, Konyang University, 26 Nae-dong, Nonsan, Chungnam 320-711, Korea
HWAHAK KONGHAK, October 2003, 41(5), 617-623(7), NONE
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Abstract
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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Augugliaro V, Loddo V, Palmisano L, Schiavello M, J. Catal., 153(1), 32 (1995)
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Song KC, Pratsinis SE, J. Am. Ceram. Soc., 84(1), 92 (2001)
Song KC, Pratsinis SE, J. Colloid Interface Sci., 231(2), 289 (2000)
Song KC, Pratsinis SE, J. Mater. Res., 15(11), 2322 (2000)
Oguri Y, Riman RE, Bowen HK, J. Mater. Sci., 23, 2897 (1988)
Cheng H, Ma J, Zhao Z, Qi L, Chem. Mater., 7(4), 663 (1995)
Kondo M, Shinozaki K, Ooki R, Mizutani N, J. Ceram. Soc. Jpn., 102(8), 742 (1994)
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Lee BM, Shin DY, Han SM, J. Korean Ceram. Soc., 37(4), 308 (2000)
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Kumar KN, Keizer K, J. Am. Ceram. Soc., 77, 1396 (1994)
Kim SY, Yu JH, Lee JS, Kim JR, Kim BK, J. Korean Ceram. Soc., 36(7), 742 (1999)
