Nature. 2018 Jan 18;553(7688):313-318. doi:10.1038/nature25137

Yang Z, Wei J, Sobolev YI, Grzybowski BA.

Systems of mechanized and reactive droplets powered by multi-responsive surfactants.

New amphiphilic surfactants containing gold, iron oxide or lead sulfide were used to create droplets that aggregate in magnetic fields, translate or rotate under laser illumination, and weld together electric fields. Combining these three manipulations allowed for the creation of complex structures used as microreactors for chemical reactions between reagents brought by individual droplets.