Like-charge interactions between colloidal particles are asymmetric with respect to sign. Academic Article uri icon


  • 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.

published proceedings

  • Soft Matter

author list (cited authors)

  • Gomez, E. W., Clack, N. G., Wu, H., & Groves, J. T.

citation count

  • 31

complete list of authors

  • Gomez, Esther W||Clack, Nathan G||Wu, Hung-Jen||Groves, Jay T

publication date

  • May 2009