Unbinding Transition Induced by Osmotic Pressure in Relation to Unilamellar Vesicle Formation

Details Unbinding Transition Induced by Osmotic Pressure in Relation to Unilamellar Vesicle Formation Unbinding Transition Induced by Osmotic Pressure in Relation to Unilamellar Vesicle Formation

2006-07-26

arxiv.org/abs/cond-mat/0607672v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1209/0295-5075/80/48002

Small-angle X-ray scattering and phase-contrast microscopy experiments were performed to investigate the effect of the osmotic pressure on vesicle formation in a dioleoylphosphatidylcholine (DOPC)/water/NaI system. Multi-lamellar vesicles were formed when a pure lipid film was hydrated with an aqueous solution of NaI. On the other hand, uni-lamellar vesicles (ULVs) were formed when a lipid film mixed with an enough amount of NaI was hydrated. To confirm the effect of the osmotic pressure due to NaI, a free-energy calculation was performed. This result showed that the osmotic pressure induced an unbinding transition on the hydration process, which resulted in ULV formation.

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