Microscopic “Slide-Snap” Receding Contact Line Dynamics on Superhydrophobic Surfaces

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Receding angles have been shown to have great significance when designing a superhydrophobic surface for applications involving self-cleaning. Although apparent receding angles under dynamic conditions have been well studied, the microscopic receding contact line dynamics are not well understood. Therefore, we present to the best of our knowledge, a first experimental investigation to measure the microscopic receding contact line dynamics of superhydrophobic surfaces with textured pillar and irregular surface features at micron length scales and at microsecond temporal resolution. A drop was set in motion on these surfaces so that its three-phase receding contact line dynamics could be recorded using a high speed camera fitted with high magnification optics for analysis. Results revealed that the receding line progressed from the lower edge of a pillar, across the length of the pillar top before “snapping” to advance to the adjacent pillar, creating a “slide-snap” motion. This is in contrast to the “stick-slip” motion that was reported in previous studies.

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Journal: TechConnect Briefs
Volume: 1, Advanced Materials: TechConnect Briefs 2015
Published: June 14, 2015
Pages: 476 - 479
Industry sector: Advanced Materials & Manufacturing
Topic: Advanced Materials for Engineering Applications
ISBN: 978-1-4987-4727-1