Surface Polarization Effects on Collapse Transition of Polyelectrolyte Brushes

Xiao-Fei Xu

doi:10.1007/s10118-024-3086-8

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Surface Polarization Effects on Collapse Transition of Polyelectrolyte Brushes

RESEARCH ARTICLE | Updated：2024-08-27

- Surface Polarization Effects on Collapse Transition of Polyelectrolyte Brushes
- Chinese Journal of Polymer Science Vol. 42, Issue 9, Pages: 1313-1320(2024)
- Affiliations：
  
  State Key Laboratory of Chemical Engineering and School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
- Author bio：
  
  xuxf@ecust.edu.cn
- Funds：
- DOI：10.1007/s10118-024-3086-8
  CLC：
- Published：01 September 2024，
  
  Published Online：01 March 2024，
  
  Received：28 October 2023，
  
  Revised：15 December 2023，
  
  Accepted：25 December 2023
- Accepted：
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Xu, X. F. Surface polarization effects on collapse transition of polyelectrolyte brushes. Chinese J. Polym. Sci. 2024, 42, 1313–1320

Xiao-Fei Xu. Surface Polarization Effects on Collapse Transition of Polyelectrolyte Brushes. [J]. Chinese Journal of Polymer Science 42(9):1313-1320(2024)
Xu, X. F. Surface polarization effects on collapse transition of polyelectrolyte brushes. Chinese J. Polym. Sci. 2024, 42, 1313–1320 DOI： 10.1007/s10118-024-3086-8.

Xiao-Fei Xu. Surface Polarization Effects on Collapse Transition of Polyelectrolyte Brushes. [J]. Chinese Journal of Polymer Science 42(9):1313-1320(2024) DOI： 10.1007/s10118-024-3086-8.

摘要

This work demonstrated the importance of simultaneously taking the image charge effect and ion solvation beyond point-charge model into consideration when modeling the surface polarization effect.

Abstract

Polyelectrolyte brushes (PEBs) are commonly used to modify surface that have attracted great research interest. The dielectric permittivity of the grafted surface is typically significantly different from that of solution

which results in surface polarization (SP) effect with a jump of electric field. It is thus important to study how SP alters the PEB’s structure and properties. In this work

the SP effects on PEB structure was studied using a statistical thermodynamic theory. The free energy functional to describe SP effect was constructed by using the image-charge method. Meanwhile

the electrostatic potential was solved from a modified Poisson-Boltzmann equation taking the ion solvation effect into consideration. In the absence of SP

the thickness of PEB exhibited a continuous collapse transition when decreasing the solvent quality. In the presence of SP

the collapse became a jump-like transition. Free energy analysis showed that the long-range Coulombic interaction dominated the transition because of the enhanced counterion condensation in the presence of SP. The theory provides an effective tool to study SP effect on PEBs

and the results explain the underlying physics in PEB collapse transition.

关键词

Keywords

Surface polarizationPolyelectrolyte brushImage chargeIon solvationPolyelectrolyte collapse transition

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