Droplet generating device and method

A method of generating mono-dispersed nano- and micro-liposomes using droplet generators includes a step of providing a droplet generator with a carrier fluid inlet, a focusing fluid inlet, and an outlet for focusing fluid and liposomes. A carrier fluid including an aqueous solution and a focusing fluid including a solvent and lipid mixture are selected to form a partially miscible fluid system. The selected carrier fluid is injected into the carrier fluid inlet and the selected focusing fluid is injected into the focusing fluid inlet and the focusing fluid and liposomes are collected from the outlet. The focusing fluid is removed from the liposomes by diluting the focusing fluid in water.