Measurement of apparent slip near a high speed receding contact line on a hydrophobic surface

Abstract eng:
The flow near a receding contact line on a hydrophobic surface was measured using a particle tracking velocimetry from two different experimental techniques: multi-layer flood illumination and Total Internal Reflection Fluorescent Microscopy. The high speed receding contact line motion was generated using a liquid bridge instability by stretching a liquid bridge formed between a syringe and a hydrophobic substrate. Significant apparent slip is observed and the derived slip velocity appears to be inversely proportional to the distance from the contact line, while the slip length changes from O(10 nm) to O(1u\µm) toward the contact line singularity.

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