Provided are emulsions and foam compositions that include patchy particles having at least two different surface chemistries, such as Janus particles. Also provided are methods of stabilizing emulsions and foam compositions by adding patchy particles to such emulsions or foam compositions during the process of forming such emulsions or foam compositions or after formation thereof. Further provided are methods of controlling droplet size in an emulsion or foam composition by adding patch particles having at least two different surface chemistries to the emulsion or foam composition. Additional embodiments are disclosed.
STATEMENT AS TO FEDERALLY SPONSORED RESEARCH
 This subject matter of this application may have been funded in part under the following federal research grants and contracts: National Science Foundation grants DMR-0605947 and CMS-0555820, and U.S. Department of Energy grants DEFG02-02ER46019 and DEFG02-96-ER45439. The U.S. Government may have certain rights in this invention.