An Electrode-Matrix Cell for Electrolytic Conductivity Measurements

Traceability of electrolytic conductivity measurements to the International System of Units in the sub mSm−1 region and review of models of electrolytic conductivity cells

“…This design enables a good flow through the area where the electric field is effective and a cell constant around 10 −3 m −1 . Planar cell structures have also attracted interest [41][42][43]. In particular, lithographic techniques allow for a flexible design, which offers the possibility to miniaturise conductivity sensors and realise small cell constants (lab on a chip).…”

“…For more complex geometries, the electric/current field distribution inside the cell has to be computed by numerical techniques, which can be based on finite difference, finite element or boundary element methods (e.g. [10,43]). …”

Experimental and numerical characterization of an electrode-matrix cell for electrochemical measurements

“…Preliminary impedance measurements have been carried out considering aqueous solutions with different KCl ion concentrations [22]. The comparison on integral physical quantities between experiment and model has provided encouraging results, giving impulse to a further deepening of the cell behaviour.…”

“…[22]. This sensor is composed of a coplanar electrode structure with thirty-six electrodes, allowing a variable cell constant through the modification of the number and location of energized electrodes.…”

“…To this purpose, the present paper moves towards several directions. First, it provides a modelling interpretation of the polarization phenomena occurring at low frequency by inserting, in the equivalent electric circuit previously adopted in [22], an additional parameter representative of double-layer capacitive effects. In this way, also the low cut-off frequency in the cell impedance behaviour can be numerically predicted.…”