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

Esther W. Gomez, Nathan G. Clack, Hung Jen Wu, Jay T. Groves

Research output: Contribution to journalArticle

20 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1931-1936
Number of pages6
JournalSoft matter
Volume5
Issue number9
DOIs
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

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