title: Liquid-body resonance while contacting a rotating superhydrophobic surface.
abstract: We advance a scheme in which a liquid body on a stationary tip in contact with a rotating superhydrophobic surface is able to maintain resonance primarily from stick-slip events. With tip-to-surface spacing in the range 2.73 ≤ h < 2.45 mm for a volume of 10 μL, the liquid body was found to exhibit resonance independent of the speed of the drum. The mechanics were found to be due to a surface-tension-controlled vibration mode based on the natural frequency values determined. With spacing in the range 2.45 ≤ h < 2.15 mm imposed for a volume of 10 μL, the contact length of the liquid body was found to vary with rotation of the SH drum. This was due to the stick-slip events being able to generate higher energy fluctuations causing the liquid-solid contact areas to vary since the almost oblate spheroid shape of the liquid body had intrinsically higher surface energies. This resulted in the natural frequency perturbations being frequency- and amplitude-modulated over a lower frequency carrier. These findings have positive implications for microfluidic sensing.
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, VIC3800, Clayton, Australia.
authors.forename: Matthew Lai Ho
authors.initials: ML
authors.lastname: Chong
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, VIC3800, Clayton, Australia.
authors.forename: Michael
authors.initials: M
authors.lastname: Cheng
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, VIC3800, Clayton, 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, VIC3800, Clayton, 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, VIC3800, Clayton, Australia.
authors.forename: Brandon Huey-Ping
authors.initials: BH
authors.lastname: Cheong
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, VIC3800, Clayton, Australia.
authors.forename: Alifa Afiah Ahmad
authors.initials: AA
authors.lastname: Zahidi
authors.affiliation: Biomechanics and Biomaterials Laboratory, Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, 100081, Beijing, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Centre for Translational Medicine, Cardiovascular Research Institute, 14, Medical Drive, 117599, Singapore, Singapore.
authors.forename: Oi Wah
authors.initials: OW
authors.lastname: Liew
authors.affiliation: Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, VIC3800, Clayton, Australia. engngtw@gmail.com.
authors.forename: Tuck Wah
authors.initials: TW
authors.lastname: Ng
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D044085:Microfluidics; D049329:Nanostructures / Q000737:chemistry*; D012399:Rotation; D013499:Surface Properties
keywords: Soft Matter: Interfacial Phenomena and Nanostructured Surfaces