AVS 59th Annual International Symposium and Exhibition
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP18
High Hydrophobic Surface with Metabolic System using Organic Monolithic Structure

Tuesday, October 30, 2012, 6:00 pm, Room Central Hall

Session: Surface Science Poster Session
Presenter: M. Sakai, Kanagawa Academy of Science and Technology, Japan
Authors: M. Sakai, Kanagawa Academy of Science and Technology, Japan
T. Kato, Tokyo Institute of Technology, Japan
A. Nakajima, Tokyo Institute of Technology, Japan
A. Fujishima, Science University of Tokyo, Japan
Correspondent: Click to Email
Recently, the importance of controlling the wettability on the solid surface is recognized in various industries. Superhydrophobic surfaces with water contact angles exceeding 150° are currently the subject of great interest and intensive study. Superhydrophobic coatings that produce rough surfaces at the micro- and nanoscale level with low surface energies have been prepared by several methods. However, the practical applications have been limited, because the superhydrophobic coatings suffered from physical/ chemical durability. In the current paper, the super hydrophobic coating with the high physical/ chemical durability was designed using organic monolithic structure with TiO2 photocatalyst and polytetrafluoroethylene particles. The structure was formed by nanoscale frames with 3-dimensional co-continuous, which was composed of epoxy resin. Therefore, the surface with micro structures newly appeared when the top surface was scratched by physical force. Moreover, the organic frame of top surface was slowly decomposed by TiO2 photocatalyst. Then, the grimy surface could be removed by water fluid (ex. rain). The appearance of fresh micro structure might be similar to metabolic system in a plant. We evaluated the durability performance of the superhydrophobic coating in accelerated weathering test and wear resistance test. In these results, the superhydrophobic coating has kept outdoor durability for 6 years.