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  • EWOD driven cleaning of bioparticles on hydrophobic and superhydrophobic surfaces.

EWOD driven cleaning of bioparticles on hydrophobic and superhydrophobic surfaces.

Lab on a chip (2010-11-26)
M Jönsson-Niedziółka, F Lapierre, Y Coffinier, S J Parry, F Zoueshtiagh, T Foat, V Thomy, R Boukherroub
ABSTRACT

Environmental air monitoring is of great interest due to the large number of people concerned and exposed to different possible risks. From the most common particles in our environment (e.g. by-products of combustion or pollens) to more specific and dangerous agents (e.g. pathogenic micro-organisms), there are a large range of particles that need to be controlled. In this article we propose an original study on the collection of electrostatically deposited particles using electrowetting droplet displacement. A variety of particles were studied, from synthetic particles (e.g. Polystyrene Latex (PSL) microsphere) to different classes of biological particle (proteins, bacterial spores and a viral simulant). Furthermore, we have compared ElectroWetting-On-Dielectric (EWOD) collecting efficiency using either a hydrophobic or a superhydrophobic counter electrode. We observe different cleaning efficiencies, depending on the hydrophobicity of the substrate (varying from 45% to 99%). Superhydrophobic surfaces show the best cleaning efficiency with water droplets for all investigated particles (MS2 bacteriophage, BG (Bacillus atrophaeus) spores, OA (ovalbumin) proteins, and PSL).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Polystyrene, average Mw ~350,000, average Mn ~170,000
Sigma-Aldrich
Polystyrene, average Mw ~400,000 by GPC
Sigma-Aldrich
Polystyrene, average Mw ~192,000
Sigma-Aldrich
Polystyrene, average Mw ~280,000 by GPC