Abstract
Transparent, superhydrophobic coating films have been prepared on polymer substrates at low temperatures through the sol-gel method. Al2O3 gel films were prepared on poly(ethylene terephthalate) substrates from Al(O-sec-C4H9)3 chemically modified with ethyl acetoacetate. A small roughness of about 20–50 nm was found to form on the surface of the Al2O3 gel films dried at room temperature and then immersed in hot water at 60°C. The electron diffraction measurements have shown that this roughened surface consists of pseudoboehmite nanocrystals. The coating of hydrolyzed fluoroalkyltrimethoxysilane on the Al2O3 gel films with the small roughness produced transparent, superhydrophobic films with contact angle for water larger than 150°.
Similar content being viewed by others
References
A.W. Adamson, Physical Chemistry of Surfaces, 5th edn., (John Wiley & Sons, New York, 1990), p. 385.
T. Onda, S. Shibuichi, N. Satoh, and K. Tsujii, Langmuir 12, 2125 (1996).
K. Ogawa, M. Soga, Y. Takada, and I. Nakayama, Jpn. J. Appl. Phys. Part 2 32, L614 (1993).
A. Hozumi and O. Takai, Thin Solid Films 303, 222 (1997).
H. Sasaki and M. Shouji, Chem. Lett. 293 (1998).
K. Tadanaga, N. Katata, and T. Minami, J. Am. Ceram. Soc. 80, 1040 (1997).
K. Tadanaga, N. Katata, and T. Minami, J. Am. Ceram. Soc. 80, 3213 (1997).
T. Minami, N. Katata, and K. Tadanaga, Proc. SPIE (Sol-Gel Optics IV) 3136, 168 (1997).
K. Tadanaga, J. Morinaga, A. Matsuda, and T. Minami, Chem. Materials 12(3), 590 (2000).
K. Tadanaga, K. Kitamuro, J. Morinaga, Y. Kotani, A. Matsuda, and T. Minami, Chem. Lett. 864 (2000).
Rights and permissions
About this article
Cite this article
Tadanaga, K., Kitamuro, K., Matsuda, A. et al. Formation of Superhydrophobic Alumina Coating Films with High Transparency on Polymer Substrates by the Sol-Gel Method. Journal of Sol-Gel Science and Technology 26, 705–708 (2003). https://doi.org/10.1023/A:1020785818687
Issue Date:
DOI: https://doi.org/10.1023/A:1020785818687