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Adsorption of two-dimensional polymers with two- and three-body self-interactions
Nathann T Rodrigues1, Tiago J Oliveira1, Thomas Prellberg2
1Departamento de Física, Universidade Federal de Viçosa, 36570-900, Viçosa, Minas Gerais, Brazil.
Physical Review. E
|January 23, 2020
Summary
This study explores polymer adsorption on a lattice using simulations. It reveals a complex phase diagram with distinct adsorbed states, showing continuous or discontinuous transitions depending on bulk phases.
Area of Science:
- Statistical Mechanics
- Polymer Physics
- Surface Science
Background:
- Investigating polymer adsorption is crucial for understanding material properties.
- Self-avoiding trails on lattices model complex polymer behaviors.
- On-site monomer-monomer interactions influence polymer conformation and adsorption.
Purpose of the Study:
- To map the phase diagram of self-avoiding trails on a triangular lattice.
- To analyze the effects of two- and three-body on-site interactions on adsorption.
- To characterize the nature of adsorption transitions and distinct adsorbed states.
Main Methods:
- Extensive Monte Carlo simulations were employed.
- The study focused on a triangular lattice model.
- Analysis covered varying strengths of two-body, three-body, and surface interactions.
Main Results:
- A phase diagram with four distinct phases (swollen, globule, crystal, adsorbed) was identified.
- Adsorption transitions were found to be continuous or discontinuous, influenced by bulk phases.
- Two distinct regions within the adsorbed phase were observed, characterized by single- or double-layer ground states.
Conclusions:
- The system exhibits rich phase behavior with multicritical points and lines.
- A smooth crossover, not a phase transition, occurs between the two adsorbed regions.
- Understanding these phases is key for designing materials with specific surface properties.
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