Linear Stepper Actuation Driving Drop Resonance and Modifying Hysteresis

Mayur Katariya, So Hung Huynh, Darren McMorran, Chun Yat Lau, Murat Muradoglu, Tuck Wah Ng

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)


In this work, 2 μL water drops are placed on substrates that are created to have a circular hydrophilic region bounded by superhydrophobicity so that they exhibit high contact angles. When the substrate is translated by a linear stepper actuator, the random force components present in the actuator are shown to cause the drop to rock resonantly. When the substrate is translated downward at inclination angles of up to 6° with respect to the horizontal, the contact angle hysteresis increases progressively to a limiting condition. When the substrate is moved up at inclined angles, alternatively, the contact angle hysteresis increases initially to the limiting condition before it is progressively restored to its static state. These behaviors are accounted for by the reversible micro-Cassie to Wenzel wetting state transformations that are made possible by the hierarchical microscale and nanoscale structures present in the superhydrophobic regions.

Original languageEnglish
Pages (from-to)8550-8556
Number of pages7
Issue number33
Publication statusPublished - 23 Aug 2016

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