Faradaic reactions’ mechanisms and parameters in charging of oils

Abhilash Sankaran, Christopher Staszel, Farzad Mashayek, Alexander Yarin

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Leaky dielectric liquids, e.g. oils, constitute a class of conductors capable of being electrified to possess a net charge. Faradaic reactions have been recently demonstrated to be responsible for the electrification of such liquids as canola oil in electrostatic atomizers. Here we explain the fundamental chemical kinetics of the mechanisms responsible for charging of these oils at metallic electrodes and measure their parameters. Three main mechanisms of the electrode faradaic reactions of oil are recognized. (i) Cathodic reduction of protons resulting from fatty acid dissociation accompanied by anodic reactions with formation of metallo-organic deposits (metal salts of fatty acids). (ii) Redox reactions with participation of dissociated water molecules (the impurities) absorbed from the surrounding humidity. (iii) Redox reactions on a sharp pin electrode (either being a cathode or an anode) at higher voltages (with the magnitude above about 4 kV) leading to the Coulombic repulsion of charged oil from this electrode and the emergence of a toroidal vortex-like circulation in the oil bath. The electrochemical findings are corroborated by the results obtained by means of the Infrared spectroscopy and Raman spectroscopy of the electrode deposits, and the introduction of a novel method of measurement of the electric conductivity of oils used to establish the kinetic constants of the Frumkin-Butler-Volmer kinetics in the form of the Tafel plot.

Original languageEnglish
Pages (from-to)173-186
Number of pages14
JournalElectrochimica Acta
Volume268
DOIs
Publication statusPublished - 2018 Apr 1
Externally publishedYes

Fingerprint

Oils
Electrodes
Redox reactions
Fatty acids
Fatty Acids
Deposits
Dielectric liquids
Atomizers
Kinetics
Reaction kinetics
Raman spectroscopy
Protons
Electrostatics
Infrared spectroscopy
Atmospheric humidity
Anodes
Vortex flow
Cathodes
Salts
Metals

Keywords

  • Electrohydrodynamics
  • Faradaic reactions
  • Leaky dielectric
  • Oil

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Faradaic reactions’ mechanisms and parameters in charging of oils. / Sankaran, Abhilash; Staszel, Christopher; Mashayek, Farzad; Yarin, Alexander.

In: Electrochimica Acta, Vol. 268, 01.04.2018, p. 173-186.

Research output: Contribution to journalArticle

Sankaran, Abhilash ; Staszel, Christopher ; Mashayek, Farzad ; Yarin, Alexander. / Faradaic reactions’ mechanisms and parameters in charging of oils. In: Electrochimica Acta. 2018 ; Vol. 268. pp. 173-186.
@article{f17fc2756ed04087921df6838f3e9b9f,
title = "Faradaic reactions’ mechanisms and parameters in charging of oils",
abstract = "Leaky dielectric liquids, e.g. oils, constitute a class of conductors capable of being electrified to possess a net charge. Faradaic reactions have been recently demonstrated to be responsible for the electrification of such liquids as canola oil in electrostatic atomizers. Here we explain the fundamental chemical kinetics of the mechanisms responsible for charging of these oils at metallic electrodes and measure their parameters. Three main mechanisms of the electrode faradaic reactions of oil are recognized. (i) Cathodic reduction of protons resulting from fatty acid dissociation accompanied by anodic reactions with formation of metallo-organic deposits (metal salts of fatty acids). (ii) Redox reactions with participation of dissociated water molecules (the impurities) absorbed from the surrounding humidity. (iii) Redox reactions on a sharp pin electrode (either being a cathode or an anode) at higher voltages (with the magnitude above about 4 kV) leading to the Coulombic repulsion of charged oil from this electrode and the emergence of a toroidal vortex-like circulation in the oil bath. The electrochemical findings are corroborated by the results obtained by means of the Infrared spectroscopy and Raman spectroscopy of the electrode deposits, and the introduction of a novel method of measurement of the electric conductivity of oils used to establish the kinetic constants of the Frumkin-Butler-Volmer kinetics in the form of the Tafel plot.",
keywords = "Electrohydrodynamics, Faradaic reactions, Leaky dielectric, Oil",
author = "Abhilash Sankaran and Christopher Staszel and Farzad Mashayek and Alexander Yarin",
year = "2018",
month = "4",
day = "1",
doi = "10.1016/j.electacta.2018.02.065",
language = "English",
volume = "268",
pages = "173--186",
journal = "Electrochimica Acta",
issn = "0013-4686",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Faradaic reactions’ mechanisms and parameters in charging of oils

AU - Sankaran, Abhilash

AU - Staszel, Christopher

AU - Mashayek, Farzad

AU - Yarin, Alexander

PY - 2018/4/1

Y1 - 2018/4/1

N2 - Leaky dielectric liquids, e.g. oils, constitute a class of conductors capable of being electrified to possess a net charge. Faradaic reactions have been recently demonstrated to be responsible for the electrification of such liquids as canola oil in electrostatic atomizers. Here we explain the fundamental chemical kinetics of the mechanisms responsible for charging of these oils at metallic electrodes and measure their parameters. Three main mechanisms of the electrode faradaic reactions of oil are recognized. (i) Cathodic reduction of protons resulting from fatty acid dissociation accompanied by anodic reactions with formation of metallo-organic deposits (metal salts of fatty acids). (ii) Redox reactions with participation of dissociated water molecules (the impurities) absorbed from the surrounding humidity. (iii) Redox reactions on a sharp pin electrode (either being a cathode or an anode) at higher voltages (with the magnitude above about 4 kV) leading to the Coulombic repulsion of charged oil from this electrode and the emergence of a toroidal vortex-like circulation in the oil bath. The electrochemical findings are corroborated by the results obtained by means of the Infrared spectroscopy and Raman spectroscopy of the electrode deposits, and the introduction of a novel method of measurement of the electric conductivity of oils used to establish the kinetic constants of the Frumkin-Butler-Volmer kinetics in the form of the Tafel plot.

AB - Leaky dielectric liquids, e.g. oils, constitute a class of conductors capable of being electrified to possess a net charge. Faradaic reactions have been recently demonstrated to be responsible for the electrification of such liquids as canola oil in electrostatic atomizers. Here we explain the fundamental chemical kinetics of the mechanisms responsible for charging of these oils at metallic electrodes and measure their parameters. Three main mechanisms of the electrode faradaic reactions of oil are recognized. (i) Cathodic reduction of protons resulting from fatty acid dissociation accompanied by anodic reactions with formation of metallo-organic deposits (metal salts of fatty acids). (ii) Redox reactions with participation of dissociated water molecules (the impurities) absorbed from the surrounding humidity. (iii) Redox reactions on a sharp pin electrode (either being a cathode or an anode) at higher voltages (with the magnitude above about 4 kV) leading to the Coulombic repulsion of charged oil from this electrode and the emergence of a toroidal vortex-like circulation in the oil bath. The electrochemical findings are corroborated by the results obtained by means of the Infrared spectroscopy and Raman spectroscopy of the electrode deposits, and the introduction of a novel method of measurement of the electric conductivity of oils used to establish the kinetic constants of the Frumkin-Butler-Volmer kinetics in the form of the Tafel plot.

KW - Electrohydrodynamics

KW - Faradaic reactions

KW - Leaky dielectric

KW - Oil

UR - http://www.scopus.com/inward/record.url?scp=85042495307&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042495307&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2018.02.065

DO - 10.1016/j.electacta.2018.02.065

M3 - Article

AN - SCOPUS:85042495307

VL - 268

SP - 173

EP - 186

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -