Effect of adsorbed polymers on electrophoresis of dispersed particles in strong electric fields

S. Bárány, Vladimir Shilov, Ferenc Madai

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this study, the effect of adsorbed non-ionic polyethylenoxides (PEO) and polyvinil-pyrrolidones (PVP) of different molecular mass on the electrophoresis of polystyrene, graphite and aluminum oxide particles both in weak (5-20 V/cm) and strong (50-400 V/cm) electric fields has been studied. The measurements in strong fields have been performed in short electric pulses using image analyzing equipment in which we have determined the deviation of particles from their normal sedimentation trajectory. We have shown that the adsorption of PEO and PVP strongly decreases the electrophoretic velocity (Vef) of particles in weak electric fields, and this decrease is bigger the adsorbed amount is higher. This is explained by the shift of the shear plane toward solution due to polymer adsorption. At the same time the polymer adsorption only slightly changes the Vef of particles in strong fields. It means that the non-linear ("cubic") electrophoresis is independent of the position of the shear plane, i.e. the zeta-potential value. It proves our idea that the electrophoretic velocity in strong electric fields is determined mainly by the surface conductivity of particles, i.e. it is not a function of the electrokinetic potential but rather the Dukhin number that characterizes the polarization of the electric double layer.

Original languageEnglish
Pages (from-to)353-358
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume300
Issue number3 SPEC. ISS.
DOIs
Publication statusPublished - Jun 15 2007

Fingerprint

electrophoresis
Electrophoresis
Pyrrolidinones
Polymers
Electric fields
Adsorption
electric fields
polymers
Graphite
Aluminum Oxide
Polystyrenes
adsorption
Molecular mass
Zeta potential
Sedimentation
shear
electric pulses
Trajectories
oxides
Polarization

Keywords

  • Adsorption
  • Dispersed particles
  • Electrophoresis
  • Non-ionic polymers
  • Strong electric fields

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Effect of adsorbed polymers on electrophoresis of dispersed particles in strong electric fields. / Bárány, S.; Shilov, Vladimir; Madai, Ferenc.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 300, No. 3 SPEC. ISS., 15.06.2007, p. 353-358.

Research output: Contribution to journalArticle

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