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Slip Length Enhancement in Nanofluidic Flow using Nanotextured Superhydrophobic Surfaces
Author(s) -
Heverhagen Jonas,
Tasinkevych Mykola,
Rahman Atikur,
Black Charles T.,
Checco Antonio
Publication year - 2016
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201600303
Subject(s) - materials science , slippage , nanotechnology , nanoscopic scale , tapering , drag , slip (aerodynamics) , conical surface , nanometre , radius , composite material , mechanics , computer graphics (images) , physics , computer science , computer security , thermodynamics
The development of highly efficient nanofluidic devices necessitates means for enhancing and controlling fluid transport under confinement. Here, it is shown experimentally that significant interfacial drag reduction in nanoscale channels can be obtained with hydrophobic arrays of conical textures tapering to a radius of less than 10 nanometers at their tip. This geometry maximizes interfacial slippage by trapping a highly resilient air layer at the solid/liquid interface. Further, it is revealed that the composite liquid/solid‐air interface bears an electrostatic charge density comparable to that of a flat hydrophobic solid. Altogether these properties render the nanotextured surfaces highly attractive for efficient nanofluidic transport both in pressure‐driven and electroosmotic flow.