INQUISUR   21779
INSTITUTO DE QUIMICA DEL SUR
Unidad Ejecutora - UE
artículos
Título:
Studies on electrostatic interactions within model nano-confined aqueous environments of different chemical nature
Autor/es:
ACCORDINO, SEBASTIÁN R.; MONTES DE OCA, JOAN MANUEL; MALASPINA, DAVID C.; MONTES DE OCA, JOAN MANUEL; MALASPINA, DAVID C.; MENÉNDEZ, CINTIA A.; MENÉNDEZ, CINTIA A.; APPIGNANESI, GUSTAVO A.; ACCORDINO, SEBASTIÁN R.; APPIGNANESI, GUSTAVO A.
Revista:
European Physical Journal E
Editorial:
Springer New York LLC
Referencias:
Año: 2017 vol. 40 p. 78 - 85
ISSN:
1292-8941
Resumen:
We study the potential of mean force for pairs of parallel flat surfaces with attractive electrostatic interactions by employing model systems functionalized with different charged, hydrophobic and hydrophilic groups.We study the way in which the local environment (hydrophobic or hydrophilic moieties) modulates the interaction between the attractive charged groups on the plates by removing or attracting nearby water and thus screening or not the electrostatic interaction. To explicitly account for the role of the solvent and the local hydrophobicity, we also perform studies in vacuo. Additionally, the results are compared to that for non-charged plates in order to single out and rationalize the non-additivity of the different non-covalent interactions. Our simulations demonstrate that the presence of neighboring hydrophobic groups promote water removal in the vicinity of the charged groups, thus enhancing charge attraction upon self-assembly. This role of the local hydrophobicity modulating electrostatic interactions is consistent with recent qualitative descriptions in the protein binding context.