Waterlike Features, Liquid-Crystal Phase and Self-Assembly in Janus Dumbbells

TL;DR

This study uses Molecular Dynamics simulations to demonstrate that Janus dumbbell nanoparticles, composed of monomers with different interaction potentials, can exhibit waterlike anomalies and self-assembly behaviors despite one monomer lacking such anomalies in bulk.

Contribution

The paper shows that combining non-anomalous monomers in Janus nanoparticles can induce waterlike anomalies and complex self-assembled structures, revealing new design principles for nanoparticle behavior.

Findings

Janus nanoparticles exhibit waterlike anomalies due to combined interactions.

Various micelle structures and liquid-crystal phases observed.

Anomalies explained by two length scale potential characteristics.

Abstract

We use Molecular Dynamics simulations to explore the properties of dimmeric Janus nanoparticles. The nanoparticles are modeled as dumbbells. One kind of monomer interacts by a Lennard-Jones potential, while the other specie of monomer interacts though a two length scale potential. This specific two length scale potential do not present waterlike anomalies in bulk. However, our results shows that, when combined in a dimmer, the Janus nanoparticle will have waterlike anomalies. The self-assembly properties were also explored. We observe several kinds of micelles, and a liquid-crystal phase. This results indicates that is possible to create Janus nanoparticles with waterlike features using monomers without anomalous behavior. The anomalies and structures are explained with the two length scale potential characteristics.