Voltammetric Sizing of a Sphere

Abstract

The size of a glass sphere positioned in the center of a microdisk electrode is determined by using a simple electrochemical procedure and is confirmed, additionally, by a microscopical measurement of the sphere at the time of the electrochemical measurement. The cyclic voltammetric response of the naked electrode and of the electrode with the sphere positioned in its center is recorded over a wide range of scan rates (0.002-1.5 V s(-1)). The size of the sphere is then determined by comparison of the experimental voltammogram with simulations for each individual scan rate.

Solid‐State Electrochemical Reactions of Electroactive Microparticles and Nanoparticles in a Liquid Electrolyte Environment

“…Voltammetric measurements could enable the size determination (see also Section 6.3.2.2.3) of single particles of known shape, such as a sphere on a microelectrode [57]. The respective microparticle is positioned centrally on a microelectrode, after which cyclic voltammetric measurements are recorded over a wider range of scan rates (e.g., from 2 mV s À1 to 1.5 V s À1 ).…”

Electrochemical sizing of hemispherical microdroplets immobilized as regular arrays on partially blocked electrodes

“…We recently have shown that cyclic voltammetric measurements as a function of voltage scan rate can provide a sensitive measurement of the radius of a sphere positioned in the center of a microelectrode [1]. We also reported the determination of the average size of inert particles at around the micron level by a simple procedure, in which they were deposited on a macroelectrode and cyclic voltammograms run on a redox couple present in solution as a function of voltage scan rate [2].…”

Voltammetric sizing and shaping of a cylinder

“…With a total mass of the particles and a value for their density, the accurate size was calculated [1]. We sized a spherical particle placed at the center of a microdisk electrode by comparing experimental voltammograms of a simple redox system at different scan rates with simulated voltammograms [5]. The same concept was extended to three dimensions by depositing a sphere adjacent to a microdisk electrode; chronoamperometric measurements of a simple redox system were compared with Lattice Boltzmann simulations to derive the radius of the sphere and its distance from the electrode.…”