Phase behavior of repulsive polymer-tethered colloids

TL;DR

This study uses molecular dynamics simulations to investigate how polymer length and behavior influence the phase organization of polymer-tethered colloids, revealing diverse phases driven by entropy considerations.

Contribution

It introduces an explicit polymer model to analyze phase behavior, providing insights into the effects of polymer properties on colloidal self-assembly.

Findings

Multiple phases identified based on polymer and colloid entropy

Polymer behavior significantly influences structural organization

Comparison with coarse-grained models highlights their limitations

Abstract

We report molecular dynamics simulations of a system of repulsive, polymer-tethered colloidal particles. We use an explicit polymer model to explore how the length and the behavior of the polymer (ideal or self-avoiding) affect the ability of the particles to organize into ordered structures when the system is compressed to moderate volume fractions. We find a variety of different phases whose origin can be explained in terms of the configurational entropy of polymers and colloids. Finally, we discuss and compare our results to those obtained for similar systems using simplified coarse-grained polymer models, and set the limits of their applicability.