Implicit-Solvent Coarse-Grained Simulation with a Fluctuating Interface Reveals a Molecular Mechanism for Peptoid
Thomas K Haxton1, Ronald N Zuckermann1, Stephen Whitelam1
1Molecular Foundry, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Journal of Chemical Theory and Computation
|December 10, 2015
Summary
Peptoid polymers form 2D nanostructures through interface assembly. Researchers modeled monolayer buckling, predicting charge patterns influence nanosheet formation and stability.
Area of Science:
- Polymer Science
- Materials Science
- Surface Chemistry
Background:
- Peptoid polymers self-assemble into 2D nanostructures at interfaces.
- This process involves monolayer adsorption, buckling, and collapse into bilayer nanosheets upon compression.
- Understanding the molecular mechanism of buckling is crucial for controlling nanostructure formation.
Purpose of the Study:
- To investigate the molecular mechanism behind peptoid monolayer buckling at the air-water interface.
- To develop a computational model that incorporates interface fluctuations.
- To predict how different peptoid side-chain arrangements affect buckling behavior.
Main Methods:
- Developed an implicit-solvent coarse-grained model.
- Incorporated interface fluctuations using a triangular mesh.
- Simulated surface tension and surfactant adsorption effects.
Main Results:
- Predicted the buckling direction for peptoids with segregated charged side chains.
- Showed that peptoids with alternating charge patterns buckle less readily than those with segregated patterns.
- The model successfully integrated interface dynamics into peptoid assembly simulations.
Conclusions:
- Interface fluctuations play a key role in peptoid monolayer buckling.
- The arrangement of charged side chains significantly impacts the stability and buckling of peptoid monolayers.
- This study provides molecular insights into the formation of 2D peptoid nanosheets, aiding in the design of novel nanomaterials.
