Friday, 4 November 2005 - 1:34 PM
608e

Reversible Switching of Conducting Polymer Films between Superhydrophobicity and Superhydrophilicity

Lianbin Xu, Wilfred Chen, Ashok Mulchandani, and Yushan Yan. Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521

Superhydrophobic conducting polypyrrole (PPy) films are electrochemically deposited in acetonitrile electrolyte containing pyrrole monomer, perfluorooctanesulfonate (PFOS) and tiny amount of Fe (III). As-synthesized PFOS-doped (oxidized) PPy films exhibit extended porous structure with both coarse and fine scale roughness. The water contact angle is ~ 152º, and the contact angle hysteresis is ~ 8º. Reducing the PFOS-doped PPy by negative potential leads to neutral (undoped) PPy films, which are superhydrophilic (water contact angle close to 0º). By controlling the electrical potential, PPy films are changed between oxidized state and neutral state, resulting in reversibly switchable superhydrophobic and superhydrophilic surface. Details on the preparation and characterization of the PPy films are presented including contact angle measurements, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), UV-Vis spectroscopy, FT-IR spectroscopy, cyclic voltammetry (CV), and conductivity measurements.

See more of #608 - Polymer Thin Films and Interfaces IV: Functional Polymer Systems (08A22)
See more of Materials Engineering and Sciences Division

See more of The 2005 Annual Meeting (Cincinnati, OH)