Liquid-body resonance while contacting a rotating superhydrophobic surface

Matthew Lai Ho Chong, Michael Cheng, Mayur Katariya, Murat Muradoglu, Brandon Huey Ping Cheong, Alifa Afiah Ahmad Zahidi, Yang Yu, Oi Wah Liew, Tuck Wah Ng

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4 Citations (Scopus)


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.

Original languageEnglish
Article number119
Number of pages9
JournalEuropean Physical Journal E
Issue number11
Publication statusPublished - 1 Nov 2015


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