Reshaping elastic nanotubes via self-assembly of surface-adhesive nanoparticles

TL;DR

This paper demonstrates through simulations that surface-adhesive nanoparticles can self-assemble on elastic nanotubes to induce controllable shape deformations, enabling new nanostructure design methods.

Contribution

It introduces a novel approach using nanoparticle self-assembly to reshape elastic nanotubes, which was not previously achievable with mechanical manipulation.

Findings

Nanoparticles form rings, helices, or axial strings depending on nanotube properties.

Self-assembled structures influence nanotube deformation profiles.

Shape control is achieved by tuning nanoparticle concentration and nanotube elasticity.

Abstract

Elastic sheets with macroscopic dimensions are easy to deform by bending and stretching. Yet shaping nanometric sheets by mechanical manipulation is hard. Here we show that nanoparticle self-assembly could be used to this end. We demonstrate by Monte Carlo simulation that spherical nanoparticles adhering to the outer surface of an elastic nanotube can self-assemble into linear structures as a result of curvature-mediated interactions. We find that nanoparticles arrange into rings or helices on stretchable nanotubes, and as axial strings on nanotubes with high rigidity to stretching. These self-assembled structures are inextricably linked to a variety of deformed nanotube profiles, which can be controlled by tuning the concentration of nanoparticles, the nanoparticle-nanotube diameter ratio and the elastic properties of the nanotube. Our results open the possibility of designing nanoparticle-laden tubular nanostructures with tailored shapes, for potential applications in materials science and nanomedicine.