Electrochemical characterization of individual oil micro-droplets by high-frequency nanocapacitor array imaging

Christophe Renault; C. Laborde; Andrea Cossettini; Luca Selmi; F.P. Widdershoven; S.J.G. Lemay

doi:10.1039/D1FD00044F

Electrochemical characterization of individual oil micro-droplets by high-frequency nanocapacitor array imaging

Christophe Renault, C. Laborde, Andrea Cossettini, Luca Selmi, F.P. Widdershoven, S.J.G. Lemay^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

CMOS-based nanocapacitor arrays allow local probing of the impedance of an electrolyte in real time and with sub-micron spatial resolution. Here we report on the physico-chemical characterization of individual microdroplets of oil in a continuous water phase using this new tool. We monitor the sedimentation and wetting dynamics of individual droplets, estimate their volume and infer their composition based on their dielectric constant. From measurements before and after wetting of the surface, we also attempt to estimate the contact angle of individual micron-sized droplets. These measurements illustrate the capabilities and versatility of nanocapacitor array technology.

Original language	English
Pages (from-to)	175-189
Number of pages	15
Journal	Faraday Discussions
Volume	233
Early online date	19 Aug 2021
DOIs	https://doi.org/10.1039/D1FD00044F
Publication status	Published - 1 Apr 2022

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UT-Hybrid-D

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AU - Renault, Christophe

AU - Laborde, C.

AU - Cossettini, Andrea

AU - Selmi, Luca

AU - Widdershoven, F.P.

AU - Lemay, S.J.G.

PY - 2022/4/1

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AB - CMOS-based nanocapacitor arrays allow local probing of the impedance of an electrolyte in real time and with sub-micron spatial resolution. Here we report on the physico-chemical characterization of individual microdroplets of oil in a continuous water phase using this new tool. We monitor the sedimentation and wetting dynamics of individual droplets, estimate their volume and infer their composition based on their dielectric constant. From measurements before and after wetting of the surface, we also attempt to estimate the contact angle of individual micron-sized droplets. These measurements illustrate the capabilities and versatility of nanocapacitor array technology.

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JO - Faraday Discussions

JF - Faraday Discussions

ER -

Electrochemical characterization of individual oil micro-droplets by high-frequency nanocapacitor array imaging

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