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Effect of solvent gradient inside the entropic trap on polymer migration.
Dibyajyoti Mohanta1, Debaprasad Giri, Sanjay Kumar2
1Department of Physics, IIT (BHU), Varanasi 221005, India.
Physical Review. E
|March 16, 2022
Summary
This study reveals how polymer chains migrate through entropic traps, finding that solvent gradients can accelerate this process. The entropic trap itself enhances migration speed under specific solvent gradient conditions.
Area of Science:
- Polymer physics
- Statistical mechanics
- Soft matter physics
Background:
- Polymer chain migration is crucial in various biological and synthetic processes.
- Entropic traps influence polymer dynamics, but their interaction with solvent gradients is not fully understood.
Purpose of the Study:
- To investigate polymer chain migration across an entropic trap under quasiequilibrium conditions.
- To explore the impact of parallel and perpendicular solvent gradients on migration dynamics.
- To analyze polymer structural changes during migration.
Main Methods:
- Exact enumeration technique on a lattice polymer model.
- Fokker-Planck formalism utilizing a free energy landscape.
- Analysis of migration time and polymer structural conformations.
Main Results:
- Migration is faster when the solvent gradient is parallel to the migration axis.
- The entropic trap accelerates migration at specific solvent gradient values.
- Transverse solvent gradients and polymer structural changes exhibit nonmonotonic dependence on migration time.
Conclusions:
- Solvent gradients significantly influence polymer migration through entropic traps.
- The interplay between entropic traps and solvent gradients offers novel strategies for controlling polymer transport.
- This research provides new insights into polymer dynamics in complex environments.
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