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Long-ranged and soft interactions between charged colloidal particles induced by multivalent coions.

F Javier Montes Ruiz-Cabello1, Mohsen Moazzami-Gudarzi, Magdalena Elzbieciak-Wodka

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Multivalent coions significantly alter forces between charged particles in aqueous solutions, creating longer-ranged repulsive interactions. This finding impacts understanding of colloidal systems and electrostatic interactions in solutions.

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Electrochemistry

Background:

  • Understanding forces between charged particles in solutions is crucial for various applications.
  • The role of coions, especially multivalent ones, in modulating these forces is complex.
  • Existing models often focus on multivalent counterions or monovalent coions.

Purpose of the Study:

  • To investigate the forces between charged particles in aqueous solutions with multivalent coions.
  • To contrast the effect of same-sign multivalent coions with oppositely charged or monovalent coions.
  • To analyze the influence of coion valence on electrostatic interactions and force profiles.

Main Methods:

  • Utilized the colloidal probe technique to measure forces between charged particles.
  • Systematically varied the valence of coions in aqueous solutions.
  • Employed Poisson-Boltzmann theory for theoretical analysis and comparison.

Main Results:

  • Forces remain repulsive and are dominated by double-layer interactions when multivalent coions have the same charge as particles.
  • Multivalent coions lead to softer, longer-ranged force profiles compared to monovalent coions.
  • Poisson-Boltzmann theory accurately describes force profiles with multivalent coions, even for highly charged particles.

Conclusions:

  • The valence of coions profoundly influences electrostatic forces in colloidal systems.
  • Multivalent coions extend the range of repulsive interactions by altering double-layer behavior.
  • Theoretical models like Poisson-Boltzmann theory are effective in predicting these interactions.