Binary mixtures of active and passive particles on a sphere

Area of Science:

• Physics
• Soft Matter Physics
• Statistical Mechanics

Background:

• Understanding particle dynamics in mixtures is crucial for materials science.
• Curved surfaces introduce unique challenges compared to planar systems.
• Active and passive particles exhibit distinct behaviors influencing mixture dynamics.

Purpose of the Study:

• To investigate the cooperation and segregation dynamics of binary mixtures of active and passive particles on a spherical surface.
• To identify the distinct phases and the underlying mechanisms governing particle distribution.
• To explore the role of rotational diffusion and polar alignment in driving segregation.

Main Methods:

• Simulations of binary mixtures of active and passive particles on a sphere.
• Analysis of the competition between rotational diffusion and polar alignment.
• Identification of distinct particle distribution phases.

Main Results:

• Three distinct phases were identified: a mixed phase and two demixed phases.
• Rotational diffusion dominance leads to passive particle aggregation, separating hemispheres.
• Polar alignment dominance results in active particle aggregation at the equator, with passive particles at the poles, forming unique clusters.
• A balance between rotational diffusion and polar alignment leads to a completely mixed phase.

Conclusions:

• The study reveals three distinct phases in binary mixtures on a sphere, driven by the interplay of rotational diffusion and polar alignment.
• Curvature-driven effects lead to novel cluster formations not observed in planar systems.
• Findings provide insights for controlling segregation dynamics in curved environments and experimental pursuits.