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Article Dans Une Revue Journal of electroanalytical chemistry and interfacial electrochemistry Année : 2015

Electrochemical characterization of viscoelastic solutions of supramolecular polymers in phosphonium-based ionic liquids

Résumé

We have combined electrochemical, rheological and light scattering measurements to investigate the viscoelastic character of solutions of (2,4-bis (2-ethylhexylureido) toluene) (EHUT) in toluene in the presence of two ionic liquids: (trihexyl(tetradecyl) phosphonium hexafluorophosphate “Cyphos 110”) and (tris(pentafluoroethyl) trifluorophosphate “aph4-cph12”) used to substantially increase the solution conductivity required for the electrochemical study. The heterogeneous rate constant k0 of the Fc/Fc+ redox couple, the diffusivity (DFc), and the equivalent capacitance values of the double layer were measured in the presence and in the absence of EHUT. For Cyphos 110, the viscosity of solutions increases in the presence of EHUT, but the diffusion current exhibited no fluctuations. By opposition, for aph4-cph12, strong fluctuations of the diffusion current allowed to assign a viscoelastic character to the solutions when EHUT is added. Rheological and light scattering measurements revealed that the two ionic liquids act as chain stoppers for EHUT supramolecular chains. However, aph4-cph12 maintains the viscoelastic character of the EHUT solution whereas Cyphos 110 destroys the supramolecular structure.

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Chimie Autre
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Dates et versions

hal-01138570 , version 1 (02-04-2015)

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Kahina Aoudia, Naima Brinis, Lila Chaal, Boualem Saidani, L. Benyahia, et al.. Electrochemical characterization of viscoelastic solutions of supramolecular polymers in phosphonium-based ionic liquids. Journal of electroanalytical chemistry and interfacial electrochemistry, 2015, 744, pp.101-109. ⟨10.1016/j.jelechem.2015.02.015⟩. ⟨hal-01138570⟩
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