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 ú-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

Charge renormalization in planar and spherical charged lipidic aqueous interfaces / Bordi, Federico; Cametti, Cesare; Sennato, Simona; Beatrice, Paoli; Marianecci, Carlotta. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - 110:10(2006), pp. 4808-4814. [10.1021/jp055821a]

Charge renormalization in planar and spherical charged lipidic aqueous interfaces

BORDI, FEDERICO;CAMETTI, Cesare;SENNATO, Simona;MARIANECCI, CARLOTTA
2006

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 ú-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
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/364989
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 14
social impact