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Indexed by:期刊论文

Date of Publication:2014-08-01

Journal:EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY

Included Journals:SCIE、Scopus

Volume:116

Issue:8

Page Number:961-967

ISSN No.:1438-7697

Key Words:Cationic/anionic system; CO2-response; pH-response; Spontaneous vesicle

Abstract:By dynamic light scattering (DLS) and transmission electron microscopy (TEM), it is shown that spherical vesicles are formed spontaneously in the mixed systems consisting of sodium dodecyl benzene sulfonate (SDBS) and N'-dodecyl-N,N-dimethylacetamidinium bicarbonate (DAB). These vesicles can be successfully tuned by alkali, but not CO2-switch due to the unsuitable pK(a) of DAB. In SDBS/DAB system, alkalinity increase can substantially expand the vesicle size in DAB-rich zone, but same effect is indistinguishable in SDBS-rich zone. Only DAB solution can also form vesicles when the solution pH is close to the pK(a) of DAB.
   Practical applications: The vesicles can be spontaneously formed by mixing DAB and SDBS aqueous solution at various concentrations and mole fractions. These vesicles can expand gradually as the solution pH increases. They can be used as pH-response vesicles for application in drug-delivery, size-selective release, biochemical reactions, and so on.