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Giant Brainlike Aggregates from New Fluorocarbon/Hydrocarbon Hybrid Cationic Surfactants

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journal contribution
posted on 01.03.2011, 00:00 by Mamadou Oumar, Elisabeth Taffin de Givenchy, Samba Yandé Dieng, Sonia Amigoni, Frédéric Guittard
A rapid synthetic procedure in two steps from perfluoroalkylethyl iodide derivatives led to 18 novel ammonium type hybrid surfactants of the general formula: RF(CH2)2S(CH2)2N+(CH3)2RHBr (RF = C4F9, C6F13, C8F17; RH = C4H9, C6H13, C8H17, C10H21, C12H25, C14H29). These hybrid surfactants exhibited very low surface tension (from 16 to 25 mN/m) as well as low critical micellar concentration until 1.5 × 10−5 mol/L. A special focus was made on aggregation phenomenon as giant multilamellar “brainlike” vesicles were observed via cryogenic scanning electron microscopy (cryoSEM) and transmission electron microscopy (TEM; with a contrast agent) suggesting a high encapsulation ability and a very important specific surface of these particular organizations.