Particle-directed assembly of semiflexible polymer chains.

Area of Science:

• Polymer physics
• Soft matter physics
• Computational materials science

Background:

• Semiflexible polymers and spherical particles are fundamental components in various materials.
• Understanding their aggregation behavior is crucial for designing novel materials with specific properties.
• Interactions between polymers and particles significantly influence aggregate morphology.

Purpose of the Study:

• To investigate the aggregation behavior of semiflexible polymers driven by polymer-particle attractions.
• To explore the resulting aggregate structures and their internal order.
• To map out the phase diagram of aggregate formation based on interaction parameters and chain stiffness.

Main Methods:

• Langevin dynamics simulations were employed to model the system.
• A simplified model with repulsive polymer-polymer and particle-particle interactions was used.
• Attractive polymer-particle interactions drove the aggregation process.

Main Results:

• A rich phase diagram was identified, featuring globular and rod-like aggregates.
• Particle positions within aggregates exhibited liquid-like or crystalline order.
• Systems with crystalline order showed a discontinuous rod-globule transition.
• Systems with liquid-like order displayed a smooth crossover from isotropic to elongated aggregates with increasing chain stiffness.
• Polymers in elongated aggregates often formed helical configurations.

Conclusions:

• The interplay between polymer stiffness and particle interactions dictates aggregate morphology and internal structure.
• Helical polymer configurations can arise in elongated liquid-like aggregates.
• This study provides insights into the self-assembly of complex polymer-particle systems.