Journal of Inorganic Materials

• Research Paper • Previous Articles     Next Articles

Fabrication and Investigation of Superhydrophobic-Hydrophilic CaBi4Ti4O15 Coatings

LI Da1, ZHANG Yue-Li1, XIAO Wen-Jia1, YANG Yang-Yi2, HE Zhen-Hui1   

  1. 1. State Key Laboratory of Optoelectronic Materials and Technologies/School of Physics & Engineering, Sun Yat-Sen University, Guangzhou 510275, China; 2. The School of Chemistry and Chemical Engineering of Sun Yat-Sen University, Guangzhou 510275, China
  • Received:2007-07-27 Revised:2007-10-26 Published:2008-07-20 Online:2008-07-20

Abstract: CaBi4Ti4O15 coatings were fabricated on Al2O3 substrates with a simple spin coating method. These coatings were annealed at different temperatures and then kept in air at 120℃ for several days. The microstructures of CaBi4Ti4O15 coatings were
studied by using SEM. CaBi4Ti4O15 coatings display distinct wettability from superhydrophobicity to hydrophilicity, the
corresponding surface contact angles change from 152.5° to 43.6°. The SEM observation indicates the size change of crystal grains and cavities of rough surfaces is the main reason why the wettability of CaBi4Ti4O15 coatings changes from superhydrophobicity to hydrophilicity, and the intrinsically hydrophilic material performs non-wetting due to rough hierarchical structure with nano-particles.

Key words: CaBi4Ti4O15, coating, hierarchical structure, wettability

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