Geometry-induced electrostatic trapping of nanometric objects in a fluid

Madhavi Krishnan (), Nassiredin Mojarad, Philipp Kukura and Vahid Sandoghdar
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Madhavi Krishnan: Laboratory of Physical Chemistry, ETH Zurich
Nassiredin Mojarad: Laboratory of Physical Chemistry, ETH Zurich
Philipp Kukura: Laboratory of Physical Chemistry, ETH Zurich
Vahid Sandoghdar: Laboratory of Physical Chemistry, ETH Zurich

Nature, 2010, vol. 467, issue 7316, 692-695

Abstract: Charged and trapped Many fields would benefit from a simple and efficient method for trapping single atoms, molecules or particles — a task that remains fiendishly difficult when dealing with nanometre-sized objects in solution. Krishnan et al. now show that grooves and pockets etched into fluidic channels that acquire a charge on exposure to water act as highly effective electrostatic traps. They hold dissolved gold nanoparticles, polymer beads and lipid vesicles for up to several hours and without external intervention. Furthermore, their stiffness and stability are easily adjusted and they lend themselves to integration with other manipulation mechanisms. With further optimization, this trapping concept could even enable contact-free confinement of single proteins and nanoparticles, their sorting and fractionation, or assembly into high-density arrays.

Date: 2010
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DOI: 10.1038/nature09404

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