Electro-osmotic flow in hydrophobic nanochannelsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 20 декабря 2019 г.
Аннотация:Hydrophobic surfaces with large slip lengths have the potential to enhance electro-osmotic flows.
Existing theories of electroosmosis in hydrophobic channels postulate immobile surface charges and/or
make a number of simplifying assumptions by considering mostly weakly charged surfaces and thin
diffuse layers compared to channel dimension. In this paper, we extend prior models by focusing on
planar and cylindrical nanochannels. Our theory accounts for a hydrodynamic slip and a mobility of
surface charges, and is valid not only on the scale of the nanochannel with thin diffuse layers, but also
on the scale of the overlapping diffuse layer. The model is simple enough to allow us to derive analytical
approximations for the electro-osmotic velocities even when the surface potential and charge density
are quite large. We also present numerical solutions to validate the analysis and illustrate the variation of
electro-osmotic velocities in response to changes in the channel size, potential, surface charge and its
mobility, hydrodynamic slip length, and salt concentration. Our results are directly relevant for carbon
nanotubes, graphene nanochannels, and conventional nanoporous membranes.