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Dielectrophoretic trapping of nanoparticles with an electrokinetic nanoprobe
Author(s) -
Wood Nicholas R.,
Wolsiefer Amanda I.,
Cohn Robert W.,
Williams Stuart J.
Publication year - 2013
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201370121
Subject(s) - dielectrophoresis , colloidal gold , materials science , electrokinetic phenomena , nanoparticle , particle (ecology) , nanotechnology , electrode , nanoprobe , capillary action , microfluidics , composite material , chemistry , oceanography , geology
Electrophoresis 2013, 34 , 1922‐1931. DOI: 10.1002/elps.201300004 The main figure shows a three‐dimensional, branched fractal pattern of gold nanoparticles created via dielectrophoresis. Initially, a silver‐gallium nanoneedle is mounted on the end of a pulled glass capillary and coated with a thin layer of gold. A conductive coverslip (not pictured) is used to complete the point‐and‐plate system. A droplet containing suspended non‐spherical gold nanoparticles (35 nm mean diameter) of various shapes is introduced. At an AC signal of 200 kHz and 0.6 Vrms the gold nanoparticles are attracted to the probe via positive dielectrophoresis. Subsequent particle‐particle electrokinetic interactions, including pearl‐chaining, produce the resulting pattern. The inset figures (top, middle) are magnified images showing the trapped gold nanoparticles. The last inset image (bottom) shows a gold nanowire created from two electrodes.