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Cell Co-culture Patterning Using Aqueous Two-phase Systems

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Published on: March 26, 2013

Re-entrant phase behavior for systems with competition between phase separation and self-assembly.

Aleks Reinhardt¹, Alexander J Williamson, Jonathan P K Doye

¹Department of Chemistry, University of Oxford, Oxford, United Kingdom.

The Journal of Chemical Physics

|March 17, 2011

Summary

This summary is machine-generated.

Re-entrant phase behavior in patchy particle systems is modeled using statistical mechanics. The study reveals cluster formation and liquid-vapor separation, with re-entrance occurring within specific density ranges.

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Area of Science:

Statistical Mechanics
Soft Matter Physics
Physical Chemistry

Background:

Patchy particle systems exhibit complex self-assembly behaviors.
Competition between cluster formation and liquid-vapor phase separation is key.
Re-entrant phase behavior, where a system transitions back to a previous phase, is observed in such systems.

Purpose of the Study:

To develop a classical statistical mechanical model for patchy particle systems.
To determine the complete phase diagram, including re-entrant behavior.
To investigate the influence of density on phase separation and cluster formation.

Main Methods:

Modeling the system as a van der Waals fluid with self-assembling monomers.
Incorporating monodisperse clusters with no inter-species attractive interactions.
Classical statistical mechanical calculations to derive the phase diagram.

Main Results:

The model successfully predicts a region of re-entrant phase behavior.
Re-entrance is observed as temperature decreases, transitioning from monomer vapor to cluster vapor.
Physically relevant parameters show re-entrance is density-dependent, persisting at high densities.

Conclusions:

The developed model provides a framework for understanding re-entrant phenomena in patchy particle systems.
Density plays a critical role in the manifestation and extent of re-entrant phase behavior.
Further studies can explore variations in cluster properties and inter-particle interactions.