Effect of Debye length scale surface features on electro-osmosis and its use to devise a novel electro-microfluidic separation

Author:

Goyal Vishal1ORCID,Datta Subhra1ORCID

Affiliation:

1. Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India

Abstract

Numerically validated analytical predictions for electro-osmosis over a charged surface decorated with a nanoscale groove pattern are developed for the situation when the electrical double layer thickness is comparable to the spatial period of the grooves. For the analytical predictions, the groove shape can be specified by any continuous periodic function, such as the triangular, trapezoidal, and sinusoidal waveforms, which are investigated as special cases. We discover that the classical Helmholtz–Smoluchowski expression for electrokinetic mobility, notwithstanding its widespread use in measurements, is rendered invalid by the presence of Debye-length-scale unevenness in the surface topography. Furthermore, we use the depth-resolved anisotropic response of oblique grooves to design and optimize a novel electro-microfluidic strategy for separating constituents of a nano-particulate mixture.

Funder

Human Resource Development Group

Publisher

AIP Publishing

Subject

General Physics and Astronomy

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Investigation of Stokes flow in a grooved channel using the spectral method;Theoretical and Computational Fluid Dynamics;2023-11-01

2. Multiphysics of microfluidics and nanofluidics;Journal of Applied Physics;2023-03-24

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