title: Interaction of magnetic nanoparticles with phospholipid films adsorbed at a liquid/liquid interface.
abstract: The interaction of Co hexagonal magnetic nanoparticles (MNPs) with distearoyl phosphatidyl glycerol (DSPG) and distearoyl phosphatidic acid (DSPA) films adsorbed at a water/1,2-dichloroethane interface is studied employing cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), capacity curves and interfacial pressure-area isotherms. DSPA and DSPG adsorb at the interface forming homogenous films and producing a blocking effect on the transfer process of tetraethyl ammonium (TEA(+)), used as a probe cation. In the presence of Co NPs this effect is reversed and the reversible transfer process for TEA(+) is reestablished, to a greater or lesser extent depending on the structuration of the film. Co-DSPA hybrid films have a homogeneous structure while Co-DSPG films present different domains. Moreover, the presence of Co on DSPA film modifies the partition coefficient of the organic electrolyte into the hydrocarbon layer.
authors.affiliation: INFIQC (CONICET-Universidad Nacional de Córdoba), Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Ala 1, Pabellón Argentina, Ciudad Universitaria, 5000 Córdoba, Argentina. mjudi@fcq.unc.edu.ar.
authors.forename: C I
authors.initials: CI
authors.lastname: Cámara
authors.forename: L M A
authors.initials: LM
authors.lastname: Monzón
authors.forename: J M D
authors.initials: JM
authors.lastname: Coey
authors.forename: L M
authors.initials: LM
authors.lastname: Yudi
mesh_terms: D000327:Adsorption; D005025:Ethylene Dichlorides / Q000737:chemistry; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D010712:Phosphatidic Acids / Q000737:chemistry; D010715:Phosphatidylglycerols / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D005025:Ethylene Dichlorides; D058185:Magnetite Nanoparticles; D010712:Phosphatidic Acids; D010715:Phosphatidylglycerols; D010743:Phospholipids; D014867:Water; C024565:ethylene dichloride