Faceted fatty acid vesicles formed from single-tailed perfluorinated surfactants
作者： Juan Zhang , Guiying Xu , Aixin Song , Lin Wang , Meiqin Lin
DOI: 10.1039/C5SM01494H
关键词:
摘要: The aggregation behavior and rheological properties of two mixtures perfluorononanoic acid (PFNA)/NaOH perfluorodecanoic (PFDA)/NaOH were investigated in aqueous solutions. Interestingly, pH-sensitive polyhedral fatty vesicles spontaneously formed both systems, which determined by freeze-fracture transmission electron microscopy (FF-TEM) measurements. Especially, a phase transition from faceted to the L3 with increase pH was observed PFNA/NaOH system while it not PFDA/NaOH system. Differential scanning calorimetry (DSC) wide angle X-ray scattering (WAXS) measurements confirmed that bilayers crystalline station indicating crystallization fluorocarbon chains main driving force for their formation. Besides, systems perfluorofatty exhibit interesting properties, instance, they showed high viscoelasticity shear-thinning behaviour, elastic modulus (G') viscous (G'') much higher than those vesicles. Conversely, solution fluid did present viscoelastic properties. Therefore, resulted fluorinated alkyl rigidity at room temperature dense packing As far as we know, such single-tailed perfluorinated surfactants have been rarely reported. Our work successfully constructs proposes formation mechanism, should be great advance fundamental research
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