Fig. 1. Illustration of the formation process of cholate-based composite microparticles via self-assembly at the oil-water interface.

(A) Schematic illustration of the cholate-based microparticle fabrication process. The emulsion color and the shape of emulsion droplets as the heating and the reduction reaction proceed after (B) 0 min, (C) 10 min, and (D) 15 min of heating (scale bars of the bright-field images, 10 μm). Photo credit: H. Safari and M. L. Felder, University of Michigan.