Assembling Ellipsoidal Particles at Fluid Interfaces using Switchable   Dipolar Capillary Interactions
  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 
Gary B. Davies, Timm Krueger, Peter V. Coveney, Jens Harting, Fernando   Bresme
cond-mat.soft