Evidence for charge regulation in the sedimentation of charged colloids

P.M. Biesheuvel

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)


Recent experimental data for the centrifugal sedimentation-diffusion profile of charged colloidal silica (ø ~ 44 nm) in ethanol is analysed based on local charge neutrality and by either assuming a fixed particle charge or incorporating charge regulation. Especially at a high Debye length (>30 nm) the two models deviate at higher particle volume fractions ø (>0.1 vol%) with the data much better reproduced when charge regulation is included.
Original languageEnglish
Pages (from-to)L499-L504
JournalJournal of Physics-Condensed Matter
Issue number49
Publication statusPublished - 2004


  • free-energy
  • profiles
  • equilibrium

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