Fig. 4.

Bright-field optical micrographs demonstrating the reversible ordering transition of microparticles assembled at a nematic 5CB–aqueous interface upon the adsorption and desorption of the surfactant SDS. The concentration of SDS in the aqueous phase was < 5 (A and C) and 1,300 μM (B). Additional images can be found in Fig. S1. (Scale bar: 50 μm.)