Anisotropic electro-osmotic flow over super-hydrophobic surfacesстатья
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: 18 июля 2013 г.
Аннотация:Patterned surfaces with large effective slip lengths, such as super-hydrophobic surfaces
containing trapped gas bubbles, have the potential to greatly enhance electrokinetic
phenomena. Existing theories assume either homogeneous flat surfaces or patterned
surfaces with thin double layers (compared with the texture correlation length) and
thus predict simple surface-averaged, isotropic flows (independent of orientation). By
analysing electro-osmotic flows over striped slip-stick surfaces with arbitrary doublelayer
thickness, we show that surface anisotropy generally leads to a tensorial electroosmotic
mobility and subtle, nonlinear averaging of surface properties. Interestingly,
the electro-osmotic mobility tensor is not simply related to the hydrodynamic slip
tensor, except in special cases. Our results imply that significantly enhanced electroosmotic
flows over super-hydrophobic surfaces are possible, but only with charged
liquid–gas interfaces.