Catanionic vesicle-PEG-lipid system: Langmuir film and phase diagram study

Amir Berman, Meir Cohen, Oren Regev

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Catanionic surfactant systems containing PEG-lipid molecules are studied at the air-solution interface and in bulk. It is found that, upon introduction of the optimum amount of PEG-lipid molecules, the region of vesicle stability in the bulk is increased. At the air-solution interface, the system forms an equimolar (salt) film upon compression. The transition to the salt structure in the presence of PEG-lipid took place at higher surface pressure, thus supporting the results of increased stability observed with the bulk samples. The presence of PEG-lipid molecules induces film buckling, resulting in significantly smaller areas per molecule. The combined results are discussed in terms of electrostatic and steric repulsion forces.

Original languageEnglish
Pages (from-to)5681-5686
Number of pages6
JournalLangmuir
Volume18
Issue number15
DOIs
StatePublished - 23 Jul 2002

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