Volume 146, 2010
From the journal:

Faraday Discussions

Amplification of electro-osmotic flows by wall slippage: direct measurements on OTS-surfaces

Marie-Charlotte Audry,a   Agnès Piednoir,a   Pierre Joseph†a  and  Elisabeth Charlaix*a  

* Corresponding authors

a Laboratoire PMCN Université Lyon 1, CNRS UMR5586, 43 bd du 11 novembre 1918, Villeurbanne
E-mail: elisabeth.charlaix@univ-lyon1.fr

Abstract

The control of water flow in Electrostatic Double Layers (EDL) close to charged surfaces in solution is an important issue with the emergence of nanofluidic devices. We compare here the zeta potential governing the electrokinetic transport properties of surfaces, to the electrostatic potential directly measured from their interaction forces. We show that on smooth hydrophilic silica these quantities are similar, whereas on OTS-silanized hydrophobic surfaces the zeta potential is significantly higher, leading to an enhanced electro-osmotic velocity. The enhancement obtained is consistent with an interfacial water slippage on the silanized surface, characterized by a constant slip length of ∼8 nm independent of the salt concentration in the range 10−4–10−3M.

About
Cited by
Related
Download options Please wait...

Article information

DOI
https://doi.org/10.1039/B927158A
Article type
Paper
Submitted
23 Dec 2009
Accepted
28 Jan 2010
First published
12 May 2010

Faraday Discuss., 2010,146, 113-124

Permissions

Request permissions

Amplification of electro-osmotic flows by wall slippage: direct measurements on OTS-surfaces

M. Audry, A. Piednoir, P. Joseph and E. Charlaix, Faraday Discuss., 2010, 146, 113 DOI: 10.1039/B927158A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements