title: Self-Assembly of Magnetic Bacillus-Shaped Bilayer Vesicles in Catanionic Surfactant Solutions.
abstract: Bacillus-shaped bilayer vesicles of nanoscale size are very rare structures of stable surfactant self-assembly, because they are both thermodynamically and electrostatically unfavorable in solution. It is evidently demonstrated that appropriately aqueous mixtures of single-tailed cationic and anionic (catanionic) surfactants can produce rigidly bacillus-shaped bilayer vesicles with both flat parts and bent edges. The crucial requirement for forming bacillus-shaped bilayer vesicles is the use of cationic surfactants with relatively hydrophobic [FeCl3Br]-as counterions. [FeCl3Br]-can strongly associate with cationic surfactants to partition into the hydrophobic bilayer of bacillus-shaped bilayer vesicles, significantly increasing the edge energy of cationic surfactants to make them distribute in the low curvature part of bilayers. This causes the formation of bacillus-shaped bilayer vesicles, but not completely bent spherical vesicles, in the case of cationic surfactant excess. The specificity of hydrophobic counterions, [FeCl3Br]-, could also make the catanionic mixtures do not precipitate at the stoichiometric point. This new self-assembly on catanionic systems is culminated in the discovery of beautifully structured colloidal objects which are of practical use for molecular templating and controlled drug or DNA release.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Shandong University , Jinan 250100, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Xu
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Shandong University , Jinan 250100, China.
authors.forename: Wenrong
authors.initials: W
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Shandong University , Jinan 250100, China.
authors.forename: Jingcheng
authors.initials: J
authors.lastname: Hao
authors.affiliation: Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , Qingdao 266555, China.
authors.forename: Yurong
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , Qingdao 266555, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.affiliation: Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , Qingdao 266555, China.
authors.forename: Hai
authors.initials: H
authors.lastname: Xu
authors.affiliation: Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , Qingdao 266555, China.|Biological Physics, School of Physics and Astronomy, University of Manchester , Manchester M13 9PL, United Kingdom.
authors.forename: Jian R
authors.initials: JR
authors.lastname: Lu
mesh_terms: D002593:Cetrimonium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D000067493:Dynamic Light Scattering; D005290:Ferric Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008051:Lipid Bilayers / Q000737:chemistry*; D060328:Magnetic Phenomena; D060306:Magnetometry; D033363:Neutron Diffraction; D010316:Particle Size; D044367:Phase Transition; D053838:Scattering, Small Angle; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D055672:Static Electricity; D013499:Surface Properties; D013501:Surface-Active Agents / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002593:Cetrimonium Compounds; D005290:Ferric Compounds; D008051:Lipid Bilayers; D013501:Surface-Active Agents; C075204:Texapon; D012967:Sodium Dodecyl Sulfate