1 research outputs found
Single Organic Droplet Collision Voltammogram via Electron Transfer Coupled Ion Transfer
Single-emulsion
toluene oil droplets (femtoliter) containing a
hydrophobic redox probe that are dispersed in water stochastically
collide with an ultramicroelectrode (UME). The fast-scan cyclic voltammetry
(FSCV) or Fourier-transformed sinusoidal voltammetry (FTSV) is applied:
the UME was scanned with a fast, repetitive triangular, or sinusoidal
potential, and its current in time/frequency domains were monitored.
The electron transfer at the UME/oil interface is coupled with ion
transfer at the oil/water interface. Thus, the obtained transient
voltammograms of a myriad of ions were used to estimate thermodynamics
of ion transfer at the toluene/water interface. Additionally, the
single-droplet voltammogram combined with finite element simulations
reveal the droplet’s size and shape distributions. Four collision
mechanisms with new physical insights were also uncovered via comprehensive
analysis of phase angle in the frequency domain, time domain FSCVs,
and finite element simulations