Zeta description:
Zeta is a small, simple, powerful and reliable software that can be used to calculate zeta potentials for ka>6 from electrophoretic mobilities measured at the stationary level, from apparent zeta potentials displayed by zetameter or from apparent mobilities measured at 3 different levels in a rectangular cell.
For electrophoresis at high zeta potentials and thick double layers additional braking forces must be considered. The force exerted on the particle by the excess of counterions moving in opposite direction is called retardation. Moreover, when the particle moves fast enough the centres of the particle charge and countercharge (diffuse layer) do not coincide and thus the effective electric field strength felt by the particle is lower than the external field (relaxation).
Accurate differential equations accounting for these effects have been published by O'Brien and White. These equations do not lead to accurate analytical expressions to calculate mobility...
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 Zeta is not available for Handheld
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Zeta is not available for Windows Portable 
Zeta is not available for Mac 
