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

19 Citations (Scopus)

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 - May 5 2009

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Electrostatics
Colloids
Charged particles
Ionic strength
Surface chemistry
Dispersions
Surface structure
interactions
electrostatics
Imaging techniques
imaging techniques
colloids
charged particles
chemistry

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Gomez, Esther W. ; Clack, Nathan G. ; Wu, Hung Jen ; Groves, Jay T. / Like-charge interactions between colloidal particles are asymmetric with respect to sign. In: Soft Matter. 2009 ; Vol. 5, No. 9. pp. 1931-1936.
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Like-charge interactions between colloidal particles are asymmetric with respect to sign. / Gomez, Esther W.; Clack, Nathan G.; Wu, Hung Jen; Groves, Jay T.

In: Soft Matter, Vol. 5, No. 9, 05.05.2009, p. 1931-1936.

Research output: Contribution to journalArticle

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