Table of Contents
Electrostatics at the interface
Coulomb’s law
Gauss’s law
Potential due to a charged sphere
Poisson equation
Charge redistribution at phase boundaries
Electrode double layer: Gouy-Chapman Theory
Ion concentration in the double layer
Space charge density due to ions near charged surfaces
Debye-Huckel Theory
Significance of the Debye length
Application of Debye-Huckel
Colloids are mutually repelled by electrostatic forces
Double layer at a colloid
The potential near a colloid
Calculating V0
Colloids are mutually attracted by dispersive forces
The multipole expansion
London Dispersion Forces
The induced dipole term
Hamaker Theory
Superposition of forces
Calculated potential curves for 10 nm gold colloids
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