title: Linear Stepper Actuation Driving Drop Resonance and Modifying Hysteresis.
abstract: 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.
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.
authors.forename: Mayur
authors.initials: M
authors.lastname: Katariya
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.
authors.forename: So Hung
authors.initials: SH
authors.lastname: Huynh
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.
authors.forename: Darren
authors.initials: D
authors.lastname: McMorran
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.
authors.forename: Chun Yat
authors.initials: CY
authors.lastname: Lau
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.
authors.forename: Murat
authors.initials: M
authors.lastname: Muradoglu
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.
authors.forename: Tuck Wah
authors.initials: TW
authors.lastname: Ng