Assembling Ellipsoidal Particles at Fluid Interfaces using Switchable Dipolar Capillary Interactions

TL;DR

This paper demonstrates how magnetic ellipsoidal particles at fluid interfaces can be dynamically assembled into structures by switching dipolar capillary interactions on and off using external magnetic fields, enabling reconfigurable material fabrication.

Contribution

It introduces a method to control particle assembly at fluid interfaces via magnetic field-induced dipolar capillary interactions, revealing new pathways for reconfigurable soft material design.

Findings

Switchable dipolar capillary interactions enable controlled self-assembly.

External magnetic fields can induce orientation phase transitions.

Reconfigurable structures can be dynamically formed and disassembled.

Abstract

The fabrication of novel soft materials is an important scientific and technological challenge. We investigate the response of magnetic ellipsoidal particles adsorbed at fluid-fluid interfaces to external magnetic fields. By exploiting previously discovered first-order orientation phase transitions we show how to switch on and off dipolar capillary interactions between particles, leading to the formation of distinctive self-assembled structures and allowing dynamic control of the bottom-up fabrication of reconfigurable novel-structured materials