Charge renormalization in planar and spherical charged lipidic aqueous interfaces

The Journal of Physical Chemistry. B
F BordiCarlotta Marianecci

Abstract

The charge renormalization in planar and spherical charged lipidic aqueous interfaces has been investigated by means of thermodynamic and electrokinetic measurements. We analyzed the behavior of mixed DOTAP/DOPE monolayers at the air-electrolyte solution interface and DOTAP/DOPE liposomes 100 nm in size dispersed in an aqueous phase of varying ionic strength. For the two systems, we have compared the "effective" surface charge derived from the measurements of surface potential and zeta-potential to the "bare" charge based on the stoichiometry of the lipid mixture investigated. The results confirm that a strong charge renormalization occurs, whose strength depends on the geometry of the mesoscopic system. The dependence of the "effective" charge on the "bare" charge is discussed in light of an analytical approximation based on the Poisson-Boltzmann equation recently proposed.

References

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Citations

Jun 29, 2015·Colloids and Surfaces. B, Biointerfaces·Simona SennatoFederico Bordi
Dec 17, 2010·Colloids and Surfaces. B, Biointerfaces·Thais de Paula RigolettoLucimara Gaziola de la Torre
May 20, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·F BordiD Truzzolillo
Oct 13, 2007·Physical Review Letters·Aletta A VerhoeffWillem K Kegel
Jun 25, 2019·Frontiers in Chemistry·Angela CapocefaloFabio Domenici
Jan 30, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Diana PaivaSandra Rocha

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