Issue 9, 2009
From the journal:

Soft Matter

Like-charge interactions between colloidal particles are asymmetric with respect to sign†

Esther W. Gomez,ae   Nathan G. Clack,b   Hung-Jen Wue  and  Jay T. Groves*bcde  

* Corresponding authors

a Department of Chemical Engineering, University of California, Berkeley, CA, USA

b Biophysics Graduate Group, University of California, Berkeley, CA, USA
E-mail: JTGroves@lbl.gov
Tel: +1 510-666-3602

c Howard Hughes Medical Institute

d Department of Chemistry, University of California, Berkeley, CA, USA

e Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

Abstract

Two-dimensional dispersions of colloidal particles with a range of surface chemistries and electrostatic potentials are characterized under a series of solution ionic strengths. A combination of optical imaging techniques are employed to monitor both the colloid structure and the electrostatic surface potential of individual particles in situ. We find that like-charge multiparticle interactions can be tuned from exclusively repulsive to long-range attractive by changing the particle surface composition. This behavior is strongly asymmetric with respect to the sign of the surface potential. Collective long-range attractive interactions are only observed among negatively charged particles.

Graphical abstract: Like-charge interactions between colloidal particles are asymmetric with respect to sign

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Article information

DOI
https://doi.org/10.1039/B821510C
Article type
Paper
Submitted
01 Dec 2008
Accepted
23 Jan 2009
First published
20 Mar 2009

Soft Matter, 2009,5, 1931-1936

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Like-charge interactions between colloidal particles are asymmetric with respect to sign

E. W. Gomez, N. G. Clack, H. Wu and J. T. Groves, Soft Matter, 2009, 5, 1931 DOI: 10.1039/B821510C

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