Many-Body Electrostatic Forces Between Colloidal Particles at Vanishing Ionic Strength

Details Many-Body Electrostatic Forces Between Colloidal Particles at Vanishing Ionic Strength Many-Body Electrostatic Forces Between Colloidal Particles at Vanishing Ionic Strength

2009-07-03

arxiv.org/abs/0907.0721v2

Physics

Condensed Matter

Soft Condensed Matter

5 pages 2 figures

Scientific paper

10.1103/PhysRevLett.103.138301

Electrostatic forces between small groups of colloidal particles are measured using blinking optical tweezers. When the electrostatic screening length is significantly larger than the particle radius, forces are found to be non-pairwise additive. Both pair and multi-particle forces are well described by the linearized Poisson-Boltzmann equation with constant potential boundary conditions. These findings may play an important role in understanding the structure and stability of a wide variety of systems, from micron-sized particles in oil to aqueous nanocolloids.

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