Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3378687
Keywords
capacitance; coatings; dielectric thin films; electrical conductivity; electrical resistivity; electrokinetic effects; electrophoresis; gold; monolayers; multilayers; particle size; polymers; self-assembly
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Funding
- NSF [CBET-0730813]
- U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Science and Engineering [DE-FG02-07ER46390]
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Janus polystyrene particles with gold and dielectric multilayer coatings on one hemisphere are shown to drastically alter the dielectrophoresis (DEP) behavior of homogeneous precursor particles under ac-electric fields. Alkanethiol coatings on the gold-coated hemisphere can effectively modify the DEP crossover frequency (omega(c)) with a negative (n) to positive (p) (p -> n) DEP transition as increasing ac-frequency, in contrast to p -> n DEP transition observed with precursor particles. All measured n -> p DEP crossover frequencies with dependence on particle size, alkanethiol thickness, and medium conductivity are collapsed to yield a scaling with the resistance-capacitance (RC) time of the alkanethiol layer capacitance and the conductive medium resistance.
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