Aqueous microemulsions of fluorocarbons have been obtained for the first time in this laboratory by using well-defined monodisperse fluorinated polyoxyethylene sur- factants.1.2 These solutions may offer an alternative to commercial macroemulsions at present used as temporary blood substitutes because of their long-term stability and their better solubilization of fluorocarbons, and, consequently, of molecular oxygen.3 However it seems that these solutions have ...