Like-charge interactions between colloidal particles are asymmetric with respect to sign.
basic_science · Level V
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- Record sourced from PubMed, PMID 25221611.
- Also identified by PMC identifier 4161288.
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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 <i>in situ</i>. 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.