Diverging electrophoretic and dynamic mobility of model silica colloids at low ionic strength in ethanol

R.J. Kortschot, J. Lyklema, A.P. Philipsen, B.H. Erné

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Electroacoustics and laser Doppler electrophoresis were employed to measure the mobility of surface-modified silica colloids in ethanol as a function of the ionic strength. Sufficiently low volume fractions were chosen to exclude effects of interparticle interactions. At high ionic strength, the electrophoretic mobility µeµe is equal to the (electroacoustic) dynamic mobility µdµd at 3.3 MHz. However, the ratio µd/µeµd/µe increases significantly to ~~5 at low ionic strength. This increase may be related to the porous outer layer of the surface-modified silica spheres.
Original languageEnglish
Pages (from-to)65-70
Number of pages5
JournalJournal of Colloid and Interface Science
Volume422
DOIs
Publication statusPublished - 2014

Keywords

  • macroscopic electric-field
  • concentrated dispersions
  • charged colloids
  • nonaqueous dispersions
  • dielectric response
  • light-scattering
  • organic-solvent
  • cell model
  • spheres
  • suspensions

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