Non-vanishing ponderomotive AC electrophoretic effect for particle trapping

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Nanotechnology

DOI:https://doi.org/10.1088/0957-4484/22/24/245103· OSTI ID:1038482

Guan, Weihau ^[1]; Park, Jae Hyun nmn ^[2]; Krstic, Predrag S ^[2]; Reed, Mark A ^[1]

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1. Yale University
2. ORNL

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 gamma 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1038482
• Journal Information: Nanotechnology, Vol. 22, Issue 24; ISSN 0957-4484
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALTERNATING CURRENT
CHARGED PARTICLES
ELECTRODYNAMICS
PARTICLE SIZE
POLARIZABILITY
QUADRUPOLES
TRAPPING