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Related Experiment Videos

Long-range polarization attraction between two different like-charged macroions.

Rui Zhang1, B I Shklovskii

  • 1Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2005
PubMed
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A new long-range "polarization" attraction between like-charged macroions arises from differences in their surface potentials, driven by adsorbed multivalent counterions (Z-ions). This force is significant at intermediate distances, exceeding other attractions.

Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Soft Matter Physics

Background:

  • Like-charged macroions typically repel in solution.
  • Adsorbed multivalent counterions (Z-ions) can induce short-range correlation attraction.
  • Differences in macroion surface charge can lead to novel interactions.

Purpose of the Study:

  • To investigate a novel long-range attraction between like-charged macroions.
  • To elucidate the mechanism of this "polarization" attraction.
  • To compare its strength and range with other known forces.

Main Methods:

  • Theoretical modeling of macroion interactions in the presence of adsorbed counterions.
  • Consideration of macroions as conductors with fixed electric potentials.

Related Experiment Videos

  • Analysis of force dependence on inter-macroion distance and salt concentration.

    • Main Results:

    • A long-range "polarization" attraction exists between like-charged macroions with different surface charge densities.
    • This attraction arises from the formation of a charged capacitor-like structure between adjacent macroion surfaces.
    • The force decays as a power law in salt-free solutions and exponentially in the presence of salt, outperforming van der Waals and correlation attractions at relevant distances.

    Conclusions:

    • Polarization attraction is a significant, previously unrecognized force in macroion solutions.
    • This force is tunable by surface charge differences and salt concentration.
    • Experimental evidence supports the existence of this polarization attraction.