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Importance of gelation and crystallization for producing superhydrophobic surfaces from mixtures of hydrogenated castor oil and fatty acids

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Abstract

Superhydrophobic surfaces were obtained easily from a mixed solution of hydrogenated castor oil (HCO) as an organogelator and a fatty acid as a crystalline compound by a casting method: a contact angle of 160° ± 2° and a sliding angle of 5° ± 1° were achieved on a surface prepared from the mixed solution of HCO and stearic acid (SA) at 6:4 weight ratios at 30 °C. The superhydrophobicity of the surface was attributable to a hierarchical structure which consisted of self-assembled nano-fibers of HCO and nano/micrometer-scale crystals of SA on hemispherical sub-structures having a diameter of several tens of micrometers. The hierarchical structure was formed under controlled conditions involving mixing ratios of HCO and a fatty acid, preparation temperatures, and fatty acid species. These results indicated that balance between gelation of HCO and crystallization of a fatty acid in the casting process was of importance in producing superhydrophobic surfaces.

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Authors and Affiliations

  1. Nagoya Municipal Industrial Research Institute, 3-4-41 Rokuban, Atsuta-ku, Nagoya, Aichi, 456-0058, Japan

    K. Nakano, M. Yamanaka & S. Akita

  2. Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology, 1247 Yachigusa, Yakusa-Cho, Toyota, Aichi, 470-0392, Japan

    T. Ito & Y. Onouchi

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  1. K. Nakano
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  2. T. Ito
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  3. Y. Onouchi
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  4. M. Yamanaka
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  5. S. Akita
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Correspondence to K. Nakano.

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Nakano, K., Ito, T., Onouchi, Y. et al. Importance of gelation and crystallization for producing superhydrophobic surfaces from mixtures of hydrogenated castor oil and fatty acids. Colloid Polym Sci 294, 69–75 (2016). https://doi.org/10.1007/s00396-015-3748-8

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  • DOI: https://doi.org/10.1007/s00396-015-3748-8

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