Soft elastic surfaces as a platform for particle self-assembly

TL;DR

This paper investigates how elastic surfaces influence nanoparticle self-assembly, revealing that surface elasticity controls aggregate shapes and can induce wrinkling, with potential applications in nanofabrication.

Contribution

It introduces a numerical simulation framework to analyze particle self-assembly on elastic surfaces, highlighting the role of elastic response in pattern formation and surface wrinkling.

Findings

Elastic response leads to anisotropic particle interactions.

Surface elasticity controls aggregate morphology.

Particles can induce surface wrinkling under certain conditions.

Abstract

We perform numerical simulations to study self-assembly of nanoparticles mediated by an elastic planar surface. We show how the nontrivial elastic response to deformations of these surfaces leads to anisotropic interactions between the particles resulting in aggregates having different geometrical features. The morphology of the patterns can be controlled by the mechanical properties of the surface and the strength of the particle adhesion. We use simple scaling arguments to understand the formation of the different structures, and we show how the adhering particles can cause the underlying elastic substrate to wrinkle if two of its opposite edges are clamped. Finally, we discuss the implications of our results and suggest how elastic surfaces could be used in nanofabrication.