2381/11806449.v1
Katharina Haeckl
Katharina
Haeckl
Hua Li
Hua
Li
Iain M Aldous
Iain M
Aldous
Terrence Tsui
Terrence
Tsui
Werner Kunz
Werner
Kunz
Andrew P Abbott
Andrew P
Abbott
Gregory G Warr
Gregory G
Warr
Rob Atkin
Rob
Atkin
Potential Dependence of Surfactant Adsorption at the Graphite Electrode/Deep Eutectic Solvent Interface
University of Leicester
2020
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Atomic, Molecular & Chemical
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
SHAPE-CONTROLLED SYNTHESIS
ALKYL CHAIN-LENGTH
IONIC LIQUIDS
DOUBLE-LAYER
FORCE MICROSCOPY
ELECTRODEPOSITION
NANOSTRUCTURE
MIXTURES
NICKEL
MICA
2020-02-26 16:31:18
Journal contribution
https://figshare.le.ac.uk/articles/journal_contribution/Potential_Dependence_of_Surfactant_Adsorption_at_the_Graphite_Electrode_Deep_Eutectic_Solvent_Interface/11806449
Copyright © 2019 American Chemical Society. Atomic force microscopy and cyclic voltammetry are used to probe how ionic surfactant adsorbed layer structure affects redox processes at deep eutectic solvent (DES)/graphite interfaces. Unlike its behavior in water, sodium dodecyl sulfate (SDS) in DESs only adsorbs as a complete layer of hemicylindrical hemimicelles far above its critical micelle concentration (CMC). Near the CMC it forms a tail-to-tail monolayer at open-circuit potential (OCP) and positive potentials, and it desorbs at negative potentials. In contrast, cetyltrimethylammonium bromide (CTAB) adsorbs as hemimicelles at low concentrations and remains adsorbed at both positive and negative potentials. The SDS horizontal monolayer has little overall effect on redox processes at the graphite interface, but hemimicelles form an effective and stable barrier. The stronger solvophobic interactions between the C16 versus C12 alkyl chains in the DES allow CTAB to self-assemble into a robust coating at low concentrations and illustrate how the structure of the DES/electrode interface and electrochemical response can be engineered by controlling surfactant structure.