Transport phenomena
Preparative electrophoresis
Article REF: J2786 V1
Transport phenomena
Preparative electrophoresis

Authors : Hélène ROUX de BALMANN, Victor SANCHEZ

Publication date: March 10, 1997 | Lire en français

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1. Transport phenomena

Refer to the symbols table opposite for definitions of symbols and their units.

1.1 Electrophoretic mobility

Consider a spherical ion i of radius r i immersed in an infinite volume of liquid. This ion, which has a surface charge Q i gives rise to a symmetrical charge distribution in the liquid. By linearizing the Poisson-Boltzmann equation, Debye and Hückel calculated the potential distributionΦ at any point outside the ion, located at a distance x [3][4] :

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