Bound Pairs: Direct Evidence for Long-range Attraction between Like-Charged Colloids

Details Bound Pairs: Direct Evidence for Long-range Attraction between Like-Charged Colloids Bound Pairs: Direct Evidence for Long-range Attraction between Like-Charged Colloids

2007-11-19

arxiv.org/abs/0711.2883v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1016/j.ssc.2008.06.026

We report observations of stable bound pairs in very dilute deionized aqueous suspensions of highly charged polystyrene colloidal particles, with monovalent counterions, using a confocal laser scanning microscope. Through an analysis of several thousands of time series of confocal images recorded deep inside the bulk suspension, we find that the measured pair-potential, U(r) has a long-range attractive component with well depths larger than the thermal energy. These observations provide a direct and unequivocal evidence for the existence of long-range attraction in U(r) of like-charged colloidal particles.

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