Ion transfer at polarised liquid-liquid interfaces modified with adsorbed silica nanoparticles

Abstract : The interface between two immiscible electrolyte solutions (ITIES) can act as a scaffold for the assembly of nanometer-sized objects. Here we followed the adsorption of silica nanoparticles of 12 nm diameter at the ITIES by AC voltammetry and their interactions with methylene blue (MB +), selected as a model ion, by cyclic voltammetry and UV-vis absorption spectroscopy. We determined the association constant, í µí°¾ í µí±Ží µí±‘í µí± í µí±Ží µí±ž , of adsorption of MB + onto silica nanoparticles to be 1.66 10 5 , which indicated a strong affinity between them. This strong affinity shifted the Gibbs free energy of transfer by-8.9 kJ mol-1. This is in contrast with the other two ions investigated (Eosin B and tetraethylammonium), which demonstrated low affinity for the silica nanoparticles. By combining the ability of silica to adsorb onto the ITIES and their affinity for MB + , we were able to accumulate MB + at the ITIES. 2
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Contributor : Grégoire Herzog <>
Submitted on : Wednesday, July 4, 2018 - 10:58:08 AM
Last modification on : Tuesday, October 23, 2018 - 10:07:30 AM
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Martha Collins, Marc Hébrant, Grégoire Herzog. Ion transfer at polarised liquid-liquid interfaces modified with adsorbed silica nanoparticles. Electrochimica Acta, Elsevier, 2018, 282, ⟨10.1016/j.electacta.2018.06.036⟩. ⟨hal-01811914⟩

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