Surface Morphologies of Polyzwitterionic Brushes Induced by Electrostatic Strength and Counterion Valence

doi:10.7503/cjcu20230279

Abstract

Abstract:

The surface phase behavior of planar polyzwitterionic brushes was studied by molecular dynamics simulations. The evolution of the surface morphologies of polyzwitterionic brushes with the strength of electrostatic interaction in the presence of counterions with different valences was investigated. When the electrostatic interaction was gradually enhanced， the microphase separation of the polyzwitterionic brush occurred in all three cases to form a pinned micelle structure. Combining brush height， density distribution function， and backbone monomer pair correlation functions， the changes of micelle size and particle stacking state in micelles were analyzed. The difference between monovalent and multivalent counterions in inducing the phase structure of polyzwitterionic brushes was revealed by calculating the fractions of four states of positive counterions in the brushes.

Key words: Polyzwitterionic brush, Electrostatic interaction strength, Surface morphology, Molecular dynamics simulation

CLC Number:

O631.2

TrendMD:

HAO Qinghai, YANG Fan, QING Che, TAN Hongge. Surface Morphologies of Polyzwitterionic Brushes Induced by Electrostatic Strength and Counterion Valence[J]. Chem. J. Chinese Universities, 2023, 44(12): 20230279.

Figures/Tables 8

References 23

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