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Colloidal Monolayer Trapped near a Charged Wall: A Synchrotron X-Ray Diffraction Study

D. K. Satapathy, O. Bunk, K. Jefimovs, K. Nygård, H. Guo, A. Diaz, E. Perret, F. Pfeiffer, C. David, G. H. Wegdam, and J. F. van der Veen
Phys. Rev. Lett. 101, 136103 – Published 24 September 2008
Physics logo See Synopsis: Imaging colloids

Abstract

Using x-ray diffraction from microfluidic channel arrays, we have determined concentration profiles of charge-stabilized silica colloids (radius 60±2nm) confined between two like-charged dielectric walls at a few hundred nanometer distance. In solutions of very low ionic strength, strongly repulsive Coulomb interactions drive the colloids toward the central region between the walls. The addition of a small quantity of salt ions (0.2 mM) causes a dense colloidal monolayer to be trapped near the walls.

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  • Received 26 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.136103

©2008 American Physical Society

Synopsis

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Imaging colloids

Published 29 September 2008

High-intensity x-ray measurements show how suspended particles in a narrow channel are attracted to—or repelled from—the channel walls depending on the ionic concentration of the suspension. These results could have implications for the design of nanofluidic devices.

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Authors & Affiliations

D. K. Satapathy1,*, O. Bunk1, K. Jefimovs1, K. Nygård1, H. Guo2, A. Diaz1, E. Perret1, F. Pfeiffer1,3, C. David1, G. H. Wegdam2, and J. F. van der Veen1,4

  • 1Research Department of Synchrotron Radiation and Nanotechnology, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
  • 2Van der Waals-Zeeman Instituut, Universiteit van Amsterdam, 1018 XE Amsterdam, The Netherlands
  • 3École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
  • 4ETH Zürich, 8093 Zürich, Switzerland

  • *dillip.satapathy@psi.ch

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Issue

Vol. 101, Iss. 13 — 26 September 2008

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