CO2에 용해 능력이 우수한 PFPE-NH4(ammonium carboxylate perfluoro polyether) 및 PDMAEMA(poly(2-(dimethylamine)-ethyl methacrylate))-b-PFOMA(poly(1H, 1H, 2H, 2H-perfluoroocthyl methacrylate)) 계면활성제를 사용하여 W/C 마이크로에멀젼에 의해 나노 크기의 TiO2를 제조하였다. TGA-DTA, FT-IR, XRD, TEM 등을 이용하여 나노 입자 제조시 Wo(H2O/surfactant molar ratio)비에 따른 입자의 크기 및 결정성 등 물리적 성질을 조사하였다. 또한 제조된 TiO2 나노 입자의 광촉매적 특성을 알아보기 위해 회분식 반응장치를 이용하여 p-니트로페놀의 광활성을 조사하였다. 제조된 TiO2 나노 입자는 소성온도 250-450 ℃ 범위에서 유기물질과 수산화물이 분해되어 450 ℃이상 비결정 구조에서 anatase 구조로 상 전이 되었다. W/C 마이크로에멀젼에서 제조된 나노 입자의 결정성 및 결정크기는 Wo 비가 증가할수록 증가하였다. p-니트로페놀의 광분해반응에서 반응성은 결정크기에 영향을 받았으며, 결정의 크기가 작을수록 반응성이 증가하였다.

Titania nanoparticles were prepared by controlled hydrolysis of titanium tetraisopropoxide(TTIP) in PFPE-NH4(ammonium carboxylate perfluoropolyether) and PDMAEMA(poly(2-(dimethylamino)ethyl methacrylate))-b-PFOMA(poly(1H, 1H,_x000D_ 2H, 2H-perfluoroocthyl methacrylate))/Water-in-CarbonDioxide Microemulsions. The physical properties, such as crystallite size and crystallinity according to Wo ratio have been investigated by TGA-DTA, FT-IR, XRD and TEM. In addition, the photocatalytic degradation of p-nitrophenol has been studied by using batch reactor in the presence of UV light in order to compare the photocatalytic activity of prepared nanosized titania. The residual organic compound and hydroxyl group were completely removed in calcination temperature from the 250-450 ℃ and the amorphous phase changed into anatase structure above 450 ℃. The crystallinity and crystallite size of nanoparticles produced in water-in-carbon dioxide microemulsions increased with an increase of the Wo ratio. In the photocatalytic degradation of p-nitrophenol, the photocatalytic activity is mainly determined by the crystallite size of titania and the reaction rate increased with an decrease of crystallite size.

Titania Nanoparticles PFPE-NH4 PDMAEMA-b-PFOMA W/C Microemulsions Photocatalytic Degradation of p-Nitrophenol

Ogawa S, Hu K, Fan FR, Bard AJ, J. Phys. Chem. B, 101(29), 5707 (1997) 
Torimoto T, Sakata T, Mori H, Yoneyama H, J. Phys. Chem., 98(11), 3036 (1994) 
Arriagada FJ, Osseoasare K, J. Colloid Interface Sci., 170(1), 8 (1995) 
Yasushige M, Yasuhiro O, Yuki T, J. Nanoparticel Res., 3, 219 (2001) 
Fu X, Qutubuddin S, Colloids Surf., 179, 65 (2001) 
Holmes JD, Bhargava PA, Korgel BA, Johnston KP, Langmuir, 15(20), 6613 (1999) 
Consani KA, Smith RD, J. Supercrit. Fluids, 3, 51 (1990) 
Beckman EJ, Hoefling TA, Enick RM, J. Phys. Chem., 95, 7127 (1991) 
Harrison K, Goveas J, Johnston KP, Orear EA, Langmuir, 10(10), 3536 (1994) 
Eastoe J, Bayazit Z, Martel S, Steytler DC, Heenan RK, Langmuir, 12(6), 1423 (1996) 
Johnston KP, Harrison KL, Clarke MJ, Howdle SM, Heitz MP, Bright FV, Carlier C, Randolph TW, Science, 271(5249), 624 (1996) 
Harrison KL, Johnston KP, Sanchez IC, Langmuir, 12(11), 2637 (1996) 
Zielinski RG, Kline SR, Kaler EW, Rosov N, Langmuir, 13(15), 3934 (1997) 
Mcclain JB, Londono D, Combes JR, Romack TJ, Canelas DA, Betts DE, Wignall GD, Samulski ET, Desimone JM, J. Am. Chem. Soc., 118(4), 917 (1996) 
Palmisano L, Augugliaro V, Schiavello M, Sclafani A, J. Mol. Catal., 56, 284 (1989) 
Sclafani A, Palmisano L, Schiavello M, J. Phys. Chem., 94, 829 (1990) 
Dicker IB, Cohen GM, Farnhan WB, Hertler WR, Laganis ED, Sogah DY, Macromolecules, 23, 4034 (1990) 
Cullity BD, "Elements of X-Ray Diffraction," Adison-Wesley, Reading, MA (1978)
Kumar PNK, Ph.D. Thesis, University of Twente, 7500 AE Enschede, The Netherlands (1993)
Chhabra V, Pillai V, Mishra BK, Morrone A, Shah DO, Langmuir, 11(9), 3307 (1995) 
Wang ZC, Chen JF, Hu XF, Mater. Lett., 43, 87 (2000) 
Ohtani B, Ogawa Y, Nishimoto S, J. Phys. Chem. B, 101(19), 3746 (1997) 
Fletcher PDI, Howe AM, Robinson BM, J. Chem. Soc.-Faraday Trans., 183, 985 (1987)
Fendler JH, Chem. Rev., 87, 887 (1987)
Barnickel P, Wokaun A, Sayer W, Eicke HF, J. Colloid Interface Sci., 148, 80 (1991) 
Wolf K, Yazdani A, Yates P, J. Air Waste Manage. Assoc., 41, 1055 (1991)
Turchi CS, Ollis DF, J. Catal., 122, 178 (1990) 
Davis AP, Hao OJ, J. Catal., 131, 285 (1991)