Observation of hydrophobic-like behavior in geometrically patterned hydrophilic microchannels
Biomicrofluidics 4, 044103 (2010)
G. O. F. Parikesit, E. X. Vrouwe, M. T. Blom,3, and J. Westerweel. Laboratory for Aero and Hydrodynamics, Delft University of Technology, 2628 CA, Delft, The Netherlands. Department of Engineering Physics, Faculty of Engineering, Gadjah Mada University, Yogyakarta 55281, Indonesia. Micronit Microfluidics BV, 7521 PV Enschede, The Netherlands
We present our observation of meta-hydrophobicity, where geometrically patterned surfaces make hydrophilic microchannels exhibit hydrophobic-like behaviors. We analyze the wetting-induced energy decrease that results from the surface geometries and experimentally demonstrate how those geometries can modulate the dynamics of capillary-driven wetting and evaporation-driven drying of microfluidic systems. Our results also show that the modulated wetting dynamics can be employed to generate regulated patterns of microbubbles.