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Scaling and mechanism of droplet array formation on a laser-ablated superhydrophobic grid

Cited 13 time in Web of Science Cited 13 time in Scopus
Authors

Farshchian, Bahador; Gatabi, Javad R.; Bernick, Steven M.; Lee, Gwan-Hyoung; Droopad, Ravindranath; Kim, Namwon

Issue Date
2018-06
Publisher
Elsevier BV
Citation
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol.547, pp.49-55
Abstract
Superhydrophobic grid patterns were ablated on a hydrophobic polydimethylsiloxane (PDMS) substrate using a nanosecond pulsed laser. The substrate with a wettability contrast (superhydrophobic-hydrophobic) was vertically immersed in a pool of water and withdrawn at different speeds to form droplet arrays spontaneously. The size of droplets was tuned by controlling the withdrawal speed (Sw), which resulted in different contact line speeds on non-irradiated cell (NIC) and laser-irradiated grid (LIG) areas with different surface properties of noslip and partial-slip conditions, respectively. The ratio of the contact line speeds on NIC and LIG areas (SNIC/SLIG) decreased exponentially with the withdrawal speed, leading to formation of larger droplets on NIC. A geometric scaling model predicted the size of droplets formed on NIC arrays over a range of contact line speeds on NIC and LIG, the ratio of the contact line speeds, the withdrawal speed, and the size of NIC.
ISSN
0927-7757
URI
https://hdl.handle.net/10371/202107
DOI
https://doi.org/10.1016/j.colsurfa.2018.03.026
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  • College of Engineering
  • Department of Materials Science & Engineering
Research Area 2D materials, 2D crystal structures , 2D materials and fabrication processing, Advanced battery materials, Next-generation electronic devices

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