Electric-triple-layer model based AC electroosmosis flow

TL;DR

This paper introduces an electric triple layer (ETL) model to more accurately predict electroosmosis flow rates at low frequencies, addressing discrepancies between classical EDL predictions and experimental data.

Contribution

The novel ETL model improves upon the classical EDL theory by accounting for additional factors affecting electroosmosis flow, such as triple layer thickness and surface roughness.

Findings

ETL model aligns well with experimental data

Cross-over frequency slightly higher in ETL model than classical theory

Surface roughness significantly influences electroosmosis flow

Abstract

The paper presents an novel electric triple layer(ETL) model as an improved model of electrical double layer(EDL) to predict electroosmosis flow rate on the electrode surface at low frequency. The predicted slip velocity based on classical EDL theory is much higher than experimental results, and ETL model can account for this deviation. Cross-over frequency at which the maximum electroosmosis flow velocity occurs based on ETL model is a little bit higher than that predicted in EDL theory, but still in keeping with classical prediction. Influences of triple layer thickness and electrode surface roughness on electroosmosis flow are analyzed via simulation and theoretical analysis agrees with experimental data very well, proving its validity.