Effect of magnetic nanoparticle coating on their electrochemical behaviour at a polarized liquid / liquid interface

S. N. MOYA BETANCOURT; CANDELARIA INÉS CAMARA; A. V. JUAREZ; GABRIELA POZO LÓPEZ; J.S.RIVA

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

ELSEVIER

Lugar: Amsterdam; Año: 2022 vol. 911

0022-0728

The interface between two immiscible electrolyte solutions (ITIES) can act as a platform for the assembly of nanoscale materials. Here, we study the effect of the most common coated magnetic nanoparticles used in biomedicine, on their interfacial properties. The importance of this study is based on the study of the effect of applied potential on the interfacial behaviour of this materials, polar and no polar interactions that?s takes place during this perturbations. This study would explain some behaviour observed on a cell membrane. Magnetite nanoparticles were successfully obtained by co-precipitation method, and were coated with chitosan and diethylaminoethyl dextran. Microstructure, magnetic properties and the electrochemical behaviour of the nanoparticles at liquid/liquid interfaces were studied. The presence of these nanoparticles at the interface facilitate the ion transfer process and increase the value of capacity charge, as can be seen on the adsorption curves. These effects depend on the coating polymer and the amount of magnetic nanoparticles adsorbed at the interface, being higher for nanoparticles coated with chitosan. The main difference in the interfacial behaviour of the coated nanoparticles is due to the distribution of the amine groups in the chain of both polymers, since in chitosan the amine groups interact easily with ions present in both phases, because it has a linear structure, different to the branched diethylaminoethyl dextran. The results obtained in this work contribute to understanding the interactions between polymers and magnetic nanoparticles and demonstrate that liquid / liquid interfaces can be used successfully to analyse the effect that different coatings have on their interfacial behaviour.