Citation: Cong Kang, Shuang-liang Zhao, Chao-hui Tong. Response of Bi-disperse Polyelectrolyte Brushes to External Electric Fields-A Numerical Self-consistent Field Theory Study[J]. Chinese Journal of Polymer Science, ;2017, 35(1): 98-107. doi: 10.1007/s10118-017-1868-y shu

Response of Bi-disperse Polyelectrolyte Brushes to External Electric Fields-A Numerical Self-consistent Field Theory Study

a.
Department of Physics, Ningbo University, Ningbo 315211, China
b.
College of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: Chao-hui Tong, tongchaohui@nbu.edu.cn
Received Date: 9 August 2016
Revised Date: 1 September 2016
Accepted Date: 13 September 2016

Fund Project: the National Natural Science Foundation of China 21374052

The self-consistent field theory has been employed to numerically study the response of bi-disperse flexible polyelectrolyte (PE) brushes grafted on an electrode to electric fields generated by opposite surface charges on the PE-grafted electrode and a second parallel electrode. The numerical study reveals that, under a positive external electric field, the shorter and negatively charged PE chains are more responsive than the longer PE chains in terms of the relative changes in their respective brush heights. Whereas under a negative external electric field, the opposite was observed. The total electric force on the grafted PE chains was calculated and it was found that, under a positive external electric field, the magnitude of the total electric force acting on one shorter PE chain is larger than that on one longer PE chain, or vice versa. The underlying mechanism was unraveled through analyzing the total electric field across the two oppositely charged electrodes.
- Polyelectrolyte brushes,
- Self-consistent field theory,
- Electrical stimulus,
- Polydispersity
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1.
沈阳化工大学材料科学与工程学院沈阳 110142