Non-vanishing ponderomotive AC electrophoretic effect for particle trapping.
Non-vanishing ponderomotive AC electrophoretic effect for particle trapping.
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DOI:
10.1088/0957-4484/22/24/245103
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发表时间:
2011-06-17
期刊:
影响因子:
3.5
通讯作者:
Reed MA
中科院分区:
文献类型:
--
作者:
Guan W;Park JH;Krstić PS;Reed MA
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 effect 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 down scaling of the particle size.
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