Fig. 6

Liposomes and micelles. a Amphiphiles can assemble into liposomes (left), micelles (top) or lipid bilayers (bottom). Reproduced with permission from Ref. [95]. b Schematic (left) for preparation of siRNA-nanobubles (siRNA-NBs) using positively-charged siRNA micelles and gas-cored liposomes. Contrast enhanced ultrasound images on the right show the dispersion of siRNA-NBs and gas-cored liposomes (indicated by diminution in gray-scale intensity) upon low-frequency ultrasound exposure. Reprinted from Ref. [109]. Copyright (2013), with permission from Elsevier