Growth Mechanism of Nano-sized Titania-coated Silica Particles Prepared from Metal Alkoxide in a Nonionic Water-in-Oil Microemulsion

Ki Do Kim; Soon Hoi Kim; Hee Taik Kim

Journal of Industrial and Engineering Chemistry, Vol.10, No.6, 906-910, November, 2004

Ki Do Kim , Soon Hoi Kim, and Hee Taik Kim^†

Department of Chemical Engineering, Hanyang University, Ansan-si 426-791, Korea

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Nielsen's chronomal analysis was applied to clarify the growth mechanism of TiO₂ particles coated on SiO₂ core nanoparticles. In this study, SiO₂ nanoparticles and TiO₂-coated SiO₂ nanoparticles were synthesized by the hydrolysis of TEOS and TEOT, respectively, using a water-in-oil (W/O)-type microemulsion method. Firstly, SiO₂ nanoparticles 17-nm size were obtained by controlled hydrolysis of TEOS solutions, and then the SiO₂ particles in the microemulsion were allowed to coat and grow by the further addition of TEOT as a precursor of the TiO₂ particles. Considering the chronomal analysis, it was assumed that the particle growth mechanism was a surface reaction in which the rate-limiting step was a first-order polynuclear layer growth mechanism and the growth rate constant, k_p, was about 6.06X10^-8 cm/sec.

Keywords:TiO₂-coated SiO₂;W/O microemulsion;growth mechanism;chronomal analysis

[References]

Castillo R, Koch B, Ruiz P, Delmon B, J. Mater. Chem., 4, 903 (1994)
Regon O, Grtzel M, Nature (London), 353, 737 (1991)
Fujishima A, Honda K, Nature (London), 238, 37 (1972)
Quaranta NE, Soria J, Corberan VC, Fierro JL, J. Catal., 171(1), 1 (1997)
Mei DB, Dong P, Li HQ, Cheng BY, Zhang DZ, Chin. Phys. Lett., 15, 21 (1998)
Kim KD, Kim HT, J. Am. Ceram. Soc., 85, 1107 (2002)
Sridhar S, Rasmussen DH, Chen FP, Kannabiran RK, Colloids Surf. A: Physicochem. Eng. Asp., 132, 45 (1998)
Khalil KMS, J. Catal., 178(1), 198 (1998)
Kim KD, Kim HT, J. Ind. Eng. Chem., 6(5), 281 (2000)
Chang CL, Fogler HS, Langmuir, 13(13), 3295 (1997)
Nielsen AE, Kinetics of Precipitation, Pergamon Press, Oxford (1964)
Nakanishi K, Takamiya Y, J. Ceram. Soc., 72, 421 (1988)
Bell A, Matijevic E, J. Phys. Chem., 78, 2621 (1974)
Jean JH, Ring TA, Langmuir, 2, 251 (1986)
Nakanishi K, Takamiya Y, J. Ceram. Soc. Jpn., 96, 719 (1988)
Kim SH, Kim KD, Song KY, Kim HT, J. Ind. Eng. Chem., 10(3), 435 (2004)
Th J, Overbeek G, Adv. Colloid Interface Sci., 15, 251 (1982)
Barringer EA, Bowen HK, Langmuir, 1, 414 (1985)

[Related Articles]

[1] Castillo R, Koch B, Ruiz P, Delmon B, J. Mater. Chem., 4, 903 (1994)

[2] Regon O, Grtzel M, Nature (London), 353, 737 (1991)

[3] Fujishima A, Honda K, Nature (London), 238, 37 (1972)

[4] Quaranta NE, Soria J, Corberan VC, Fierro JL, J. Catal., 171(1), 1 (1997)

[5] Mei DB, Dong P, Li HQ, Cheng BY, Zhang DZ, Chin. Phys. Lett., 15, 21 (1998)

[6] Kim KD, Kim HT, J. Am. Ceram. Soc., 85, 1107 (2002)

[7] Sridhar S, Rasmussen DH, Chen FP, Kannabiran RK, Colloids Surf. A: Physicochem. Eng. Asp., 132, 45 (1998)

[8] Khalil KMS, J. Catal., 178(1), 198 (1998)

[9] Kim KD, Kim HT, J. Ind. Eng. Chem., 6(5), 281 (2000)

[10] Chang CL, Fogler HS, Langmuir, 13(13), 3295 (1997)

[11] Nielsen AE, Kinetics of Precipitation, Pergamon Press, Oxford (1964)

[12] Nakanishi K, Takamiya Y, J. Ceram. Soc., 72, 421 (1988)

[13] Bell A, Matijevic E, J. Phys. Chem., 78, 2621 (1974)

[14] Jean JH, Ring TA, Langmuir, 2, 251 (1986)

[15] Nakanishi K, Takamiya Y, J. Ceram. Soc. Jpn., 96, 719 (1988)

[16] Kim SH, Kim KD, Song KY, Kim HT, J. Ind. Eng. Chem., 10(3), 435 (2004)

[17] Th J, Overbeek G, Adv. Colloid Interface Sci., 15, 251 (1982)

[18] Barringer EA, Bowen HK, Langmuir, 1, 414 (1985)