Related Experiment Video
Updated: Jun 4, 2026
Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
Published on: January 30, 2015
Tunable wetting mechanism of polypyrrole surfaces and low-voltage droplet manipulation via redox
Yao-Tsan Tsai1, Chang-Hwan Choi, Ning Gao
1Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States.
Abstract:
This paper presents the experimental results and analyses on a controlled manipulation of liquid droplets upon local reduction and oxidation (redox) of a smart polymer-dodecylbenzenesulfonate doped polypyrrole (PPy(DBS)). The electrochemically tunable wetting property of PPy(DBS) permitted liquid droplet manipulation at very low voltages (-0.9 to 0.6 V). A dichloromethane (DCM) droplet was flattened upon PPy(DBS) reduction. It was found that the surface tension gradient across the droplet contact line induced Marangoni stress, which caused this deformation. Further observation of PPy(DBS)'s color change upon the redox process confirmed that the surface tension gradient was the driving force for the droplet shape change.
