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We investigate the sedimentation equilibrium of a charge stabilized colloidalsuspension in the regime of low ionic strength. We analyze the asymptoticbehaviour of the density profiles on the basis of a simple Poisson--Boltzmanntheory and show that the effective mass we can deduce from the barometric lawcorresponds to the actual mass of the colloidal particles, contrary to previousstudies.Comment: 13 pages, 4 figures, 1 tabl

Equilibrium sedimentation profiles of charged colloidal suspensions