Devices integrated by nanoconduits hold great potential for clinical and biochemical analysis due to ampliﬁed sensibility, faster response and increased portability. In nanoconduits, wherein the electrical double layer may occupy a considerable part of the channel, the hydrodynamics of multivalent electrolytes is highly inﬂuenced by interfacial electrokinetic phenomena, such as charge inversion (CI). We conduct atomistic simulations of an electrolyte solution which consists of water as solvent, chlorine as co-ion and diﬀerent counter-ions, i.e., sodium, magnesium and aluminum. We model Electroosmotic (EOF), Poiseuille (PF) and Couette (CF) ﬂow in silica nanochannels to probe the relation between CI and transport properties. In EOF, we observe that changes induced by CI in the electrokinetic driving force at the diﬀuse layer, signiﬁcantly alter the velocity distributions. Moreover, cases of CF and PF ﬂow show that the position of the shear plane is signiﬁcantly altered by the presence of CI. We ﬁnd that the nanoconﬁned electrolytes can be modeled as two immiscible ﬂuids with diﬀerent transport properties with the shear plane as dividing surface.
|Number of pages||1|
|Publication status||Published - 2020|
|Event||American Physical Society March Meeting 2020 - Denver, United States|
Duration: 2 Mar 2020 → 6 Mar 2020
|Conference||American Physical Society March Meeting 2020|
|Period||02/03/2020 → 06/03/2020|
Rojano, A., Walther, J. H., & A. Zambrano, H. (2020). The electrokinetic transport of multivalent electrolytes: the eﬀect of charge inversion. Abstract from American Physical Society March Meeting 2020, Denver, United States. https://absuploads.aps.org/presentation.cfm?pid=16361