Non-vanishing ponderomotive AC electrophoretic effect for particle trapping

Weihua Guan, Jae Hyun Park, Predrag S. Krstić, Mark A. Reed

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We present here a study on overlooked aspects of alternating current (AC) electrokinetics - AC electrophoretic (ACEP) phenomena. The dynamics of a particle with both polarizability and net charges in a non-uniform AC electric trapping field is investigated. It is found that either electrophoretic (EP) or dielectrophoretic (DEP) effects can dominate the trapping dynamics, depending on experimental conditions. A dimensionless parameter γ is developed to predict the relative strength of EP and DEP effects in a quadrupole AC field. An ACEP trap is feasible for charged particles in 'salt-free' or low salt concentration solutions. In contrast to DEP traps, an ACEP trap favors the downscaling of the particle size.

Original languageEnglish (US)
Article number245103
Issue number24
StatePublished - Jun 17 2011

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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