TY - JOUR
T1 - Avocado oil, coconut oil, walnut oil as true oil phase for ion transfer at nanoscale liquid/liquid interfaces
AU - Chen, Ran
AU - Xu, Kerui
AU - Shen, Mei
N1 - Funding Information:
The TEM measurements were carried out in The Beckman Institute for Advanced Science and Technology. The research reported in this publication was supported by the National Science Foundation under a CAREER award (CHE 19-45274), and University of Illinois at Urbana-Champaign to M. Shen.
Funding Information:
The research reported in this publication was supported by the National Science Foundation under a CAREER award (CHE 19-45274), and University of Illinois at Urbana-Champaign to M. Shen.
Publisher Copyright:
© 2020
PY - 2020/10/10
Y1 - 2020/10/10
N2 - The interface between two immiscible electrolyte solutions (ITIES), typically formed between an organic (oil) phase and an aqueous phase, is essential for chemical sensing and for studying various electron transfer and ion transfer reactions. Solvent, as part of ITIES structure, plays critical roles in electrochemical reactions at ITIES. While different kinds of organic phases, including viscous ionic liquid, have been reported, use of true oils as organic phase has rarely been explored. In this study, we introduce true oils, including avocado oil, coconut oil, and walnut oil as new organic solvents for ITIES. We observed well defined potential windows, and sigmoidal cyclic voltammograms for ion transfer. We further measured the ion transfer rate constants at true oil-water interfaces supported at nanopipette of ∼20–60 nm in radius. Our study offers additional insights on the effect of solvent viscosity on the ion transfer rate at the liquid/liquid interface, with the viscosity of these true oils being ∼ 50–70 times that of 1, 2-dichloroethane. We measured the standard ion transfer rate constants of tetrabutylammonium to be 0.21–0.32 cm / s at these true oil-water interface. This work lays the foundation to expand ITIES platform to explore new reactions, playing critical roles in separation science, chemical sensing, chemical synthesis, catalysis, etc.
AB - The interface between two immiscible electrolyte solutions (ITIES), typically formed between an organic (oil) phase and an aqueous phase, is essential for chemical sensing and for studying various electron transfer and ion transfer reactions. Solvent, as part of ITIES structure, plays critical roles in electrochemical reactions at ITIES. While different kinds of organic phases, including viscous ionic liquid, have been reported, use of true oils as organic phase has rarely been explored. In this study, we introduce true oils, including avocado oil, coconut oil, and walnut oil as new organic solvents for ITIES. We observed well defined potential windows, and sigmoidal cyclic voltammograms for ion transfer. We further measured the ion transfer rate constants at true oil-water interfaces supported at nanopipette of ∼20–60 nm in radius. Our study offers additional insights on the effect of solvent viscosity on the ion transfer rate at the liquid/liquid interface, with the viscosity of these true oils being ∼ 50–70 times that of 1, 2-dichloroethane. We measured the standard ion transfer rate constants of tetrabutylammonium to be 0.21–0.32 cm / s at these true oil-water interface. This work lays the foundation to expand ITIES platform to explore new reactions, playing critical roles in separation science, chemical sensing, chemical synthesis, catalysis, etc.
KW - High viscosity
KW - ITIES
KW - Nanopipette
KW - Oil
KW - Rate constant
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U2 - 10.1016/j.electacta.2020.136788
DO - 10.1016/j.electacta.2020.136788
M3 - Article
AN - SCOPUS:85089480326
SN - 0013-4686
VL - 357
JO - Electrochimica Acta
JF - Electrochimica Acta
M1 - 136788
ER -