2025-05-222025-05-222025-05-16Flores Mena, J.E., Fernández Mateo, R., García Sánchez, P. y Ramos Reyes, A. (2025). Role of concentration-polarization electroosmosis in the dielectrophoresis of highly charged colloids: A theoretical study. Physical Review E, 111 (5), 055405. https://doi.org/10.1103/physreve.111.055405.2470-00532470-0045https://hdl.handle.net/11441/173107We analyze, both analytically and numerically, the electrokinetic behavior of highly charged dielectric microparticles suspended in aqueous electrolytes. Specifically, we consider small particles subjected to nonuniform AC electric fields and describe their motion as resulting from the interplay between electrical forces—dielectrophoresis (DEP)—and steady electroosmotic flows on the particle surface, a phenomenon known as concentration-polarization electroosmosis (CPEO). The net particle motion is known as dipolophoresis (DIP). We derive analytical expressions for the induced motion in the limit of small Dukhin numbers (i.e., relatively low surface conductance) and validate these results by comparing them with numerical simulations. This comparison confirms the reliability of our numerical approach, which we then extend to explore dipolophoresis for arbitrary Dukhin numbers. Our findings indicate that at low AC field frequencies, the contribution of CPEO to particle motion becomes significant for Dukhin numbers around 0.1 or higher, eventually surpassing the effect of DEP when the Dukhin number is on the order of one.application/pdf19 p.enginfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess10.1103/physreve.111.055405