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Pressure Effects on Self-Assembly in Mixtures Containing Zwitterionic Amphiphiles
Mingge Zhao1, Xiang Li1, Junhan Cho1
1Department of Polymer Science & Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi-do 16890, Korea.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 23, 2021
Summary
High pressure influences self-assembly in zwitterionic amphiphiles. Charge correlations and dielectric constant affect this behavior, enabling tunable material properties like baroresponsivity.
Area of Science:
- Soft Matter Physics
- Materials Science
- Physical Chemistry
Background:
- Zwitterionic amphiphilic chains are crucial in self-assembly.
- Understanding their response to external stimuli like pressure is vital for materials design.
Purpose of the Study:
- To investigate the pressure-induced self-assembly of zwitterionic amphiphiles.
- To explore the role of charge correlations and dielectric environment on self-assembly.
Main Methods:
- A self-consistent field theory combined with a molecular equation-of-state model.
- Formulation of free energy density and incorporation into Edwards Hamiltonian.
- Application of saddle point approximation to the partition function.
Main Results:
- Charge-charge correlations enhance self-assembly as dielectric constant decreases.
- Pressure strengthens self-assembly at moderate dielectric constants.
- Pressure effects are charge-position dependent at lower dielectric constants.
Conclusions:
- Material properties like baroresponsivity and thermoresponsivity can be engineered.
- Manipulation of dielectric environment and dispersion interactions is key.
- Re-entrant self-assembly is achievable through controlled stimuli.
