Directional depletion interactions in shaped particles

TL;DR

This paper investigates how particle shape influences entropic interactions, demonstrating that flat faces of cut-spheres experience strong directional depletion attractions, which could be used to control self-assembly in colloidal systems.

Contribution

The study provides new insights into shape-dependent entropic forces, specifically showing how flat faces induce directional depletion attractions in shaped particles.

Findings

Flat faces of cut-spheres experience strong directional depletion attraction.

Particle shape can be used to control interaction directionality.

Shape influences the magnitude of entropic interactions.

Abstract

Entropic forces in colloidal suspensions and in polymer-colloid systems are of long-standing and continuing interest. Experiments show how entropic forces can be used to control the self-assembly of colloidal particles. Significant advances in colloidal synthesis made in the past two decades have enabled the preparation of high quality nano-particles with well-controlled sizes, shapes, and compositions, indicating that such particles can be utilized as "artificial atoms" to build new materials. To elucidate the effects of the shape of particles upon the magnitude of entropic interaction, we analyse the entropic interactions of two cut-spheres. We show that the solvent induces a strong directional depletion attraction among flat faces of the cut-spheres. Such an effect highlights the possibility of using the shape of particles to control directionality and strength of interaction.