Citation: Hai-ming Li, Yu-wei Chen, Yue-jin Zhu, Chao-hui Tong. Numerical Study of the Interplay of Monomer-Surface Electrostatic and Non-electrostatic Interactions in the Adsorption of Weak Polyelectrolytes on Oppositely Charged Surfaces[J]. Chinese Journal of Polymer Science, ;2016, 34(5): 552-562. doi: 10.1007/s10118-016-1780-x shu

Numerical Study of the Interplay of Monomer-Surface Electrostatic and Non-electrostatic Interactions in the Adsorption of Weak Polyelectrolytes on Oppositely Charged Surfaces

Department of Physics, Ningbo University, Ningbo 315211, China

Corresponding author: Chao-hui Tong, tongchaohui@nbu.edu.cn
Received Date: 30 October 2015
Revised Date: 17 December 2015
Accepted Date: 3 January 2016

Fund Project: This work was financially supported by the National Natural Science Foundation of China 21374052This work was financially supported by the National Natural Science Foundation of China 11174163

The adsorption of weak polybase on oppositely charged planar surfaces has been investigated numerically by using the self-consistent field theory (SCFT). Particular attention was paid to the interplay of monomer-surface electrostatic and non-electrostatic interactions in the adsorption behaviors of weak polybase. In this study, the strength of monomer-surface non-electrostatic interactions was set to be no more than the thermal energy k_BT. It was found from the numerical study that in the regime of low surface charge density of the substrate and low pH or high bulk degree of ionization, both the screening-enhanced and screening-reduced salt effects emerge. On the contrary, in the opposite regime, only the screening-reduced salt effect was observed. Moreover, the overall charge neutrality inside the adsorption layer was analyzed. The underlying mechanism governing the adsorption behaviors of weak polybase on oppositely charged surfaces was elucidated.
- Polyelectrolyte adsorption,
- Self-consistent field theory,
- Non-electrostatic interaction
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