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Hydrophobic non-fouling surfaces for droplet based microfluidic bioanalytical systems

This paper presents the principle, fabricated structure, characterization and results obtained for a new class of surfaces—“hydrophobic non-fouling surfaces”—for droplet-based microfluidics. Building on the theory of wetting of rough surfaces, we have developed novel surfaces which are chemically hydrophilic, i.e., the droplet is in contact with a non-fouling hydrophilic material but exhibits hydrophobic properties (high contact angle) as a result of thermodynamically stabilized air traps beneath the droplet.