The fabrication of microstructure surface of super-hydrophobic coating by surface gelation technology

Abstract

The microstructured surface of materials were fabricated by a two-step acid-base catalyzed sol-gel process. In fluorinated polymer with PTFE doping, the well-proportioned composite sols were prepared using sol-gel processing under the hydrochloric acid and deficiency of water conditions. After the substrate was coated by composite sols, and the gelation treatment on the surface of composite coating, the micrometer-scale and nanometer-scale hierarchical structures were formed in surface layer of material. XPS and TEM technologies were employed to identify that the gelation occurs just on the surface of composite coating. The morphology of coating surface was observed by SEM and AFM technologies. The microstructured surface of material can be fabricated using this inexpensive and easily controlled method on low surface energy resin materials, the super-hydrophobic coatings materials can be prepared.

Keywords

surface gelation technology / roughness / contact angle / super-hydrophobic

References

[1] Akira N., Kazuhito H., Toshiya W. Recent Studies on Super-hydrophobic Films[J]. Monatshefte für Chemie, 2001, 132: 31-41.

[2] S Mitsuyoshi, H Tomoyuki. Super Water-repellent Coating Material, and Super Water-repellent Coating Film Using the Same[P]. US Patent 6068911, 2000

[3] Hsieh C. T., Chen J. M., Kuo R. R. Influence of Surface Roughness on Water-and Oil-repellent Surface Coated with Nanoparticles[J]. Applied Surface Science, 2005, 240: 318-326.

[4] LI H. J., Wang X. B., Song Y. L. Super-“Amphiphobic” Aligned Carbon Nanotube Films[J]. Angewandte Chmie International Edition, 2001, 40(9): 1743-1746.

[5] Hozumi A., Ushiyama K., Sugimura H. Fluoroalkylsilane Monolayers Formed by Chemical Vapor Surface Modification on Hydroxylated Oxide Surfaces[J]. Langmuir, 1999, 15(22): 7600-7604.

[6] Nishino T., Meguro M., Nakamae K. The Lowest Surface Free Energy Based on-CF₃ Alignment[J]. Langmuir, 1999, 15(13): 4321-4323.

[7] Erbil Y. H., Demirel A. L., Avci Y. Transformation of a Simple Plastic into a Superhydrophobic Surface[J]. Science, 2003, 299: 1377-1380.

[8] Sasaki H., Shouji M. Control of Hydrophobic Character of Super-water-repellent Surface by UV Irradiation[J]. Chemistry Letters, 1998, 27(4): 293-294.

[9] Jung D. H., Park I. J., Choi Y. K. Perfluorinated Polymer Monolayers on Porous Silica for Materials with Super Liquid Repellent Properties[J]. Langmuir, 2002, 18(16): 6133-6139.

[10] Cao G. Z., Tian H. Synthesis of Highly Porous Organic/Inorganic Hybrids by Ambient Pressure Sol-gel Processing[J]. Journal of Sol-gel Science and Technology, 1998, 13: 305-309.

[11] Feng L., Li S. H., Li Y. S. Super-hydrophobic Surface: from Natural to Artificial[J]. Advanced Materials, 2002, 14: 1857-1860.