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Structural and electrostatic properties between pH-responsive polyelectrolyte brushes studied by augmented strong

¹Natural Science Center, Kim Il Sung University, Taesong District, Pyongyang, Democratic People's Republic of Korea.

The Journal of Chemical Physics

|September 1, 2022

Summary

We investigated pH-responsive polyelectrolyte brushes, finding that excluded volume interactions and charge density significantly impact their electrostatic and structural properties, leading to enhanced brush contraction. This work clarifies brush behavior under varying conditions.

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Area of Science:

Physical Chemistry
Polymer Science
Surface Science

Background:

Understanding the behavior of polyelectrolyte brushes is crucial in various applications, including drug delivery and biosensing.
pH-responsive polyelectrolyte brushes exhibit complex electrostatic and structural properties influenced by environmental factors.
Previous studies have explored these properties, but a comprehensive understanding of the interplay between excluded volume, charge density, and brush interactions remains an active area of research.

Purpose of the Study:

To investigate the electrostatic and structural properties of pH-responsive polyelectrolyte brushes.
To elucidate the influence of excluded volume interactions, charge density, and Born energy on brush behavior.
To develop a theoretical framework for predicting brush interactions and contractility.

Main Methods:

Utilized a strong stretching theory incorporating excluded volume interactions and charge site density.
Employed a free energy framework to derive self-consistent field equations.
Analyzed the effects of pH, Kuhn monomers, charge density, lateral separation, Kuhn length, and Born energy difference.

Main Results:

Electrostatic potential and osmotic pressure increase with excluded volume interaction and charge site density.
Brush thickness decreases upon close approach of polyelectrolyte brushes.
High excluded volume interaction and charge site density lead to enhanced polyelectrolyte brush contraction.

Conclusions:

The study provides a detailed theoretical understanding of electrostatic and structural properties of pH-responsive polyelectrolyte brushes.
Excluded volume interactions and charge density are key factors governing brush behavior and inter-brush interactions.
The findings offer insights into the design and application of polyelectrolyte brush systems.