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Proceedings Paper

Lotus and rose petal effect on polymers using femtosecond laser pulses
Author(s): Jijo Easo George; Vanessa R. M. Rodriguez; Santhosh C.; Sajan D. George
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Paper Abstract

Engineering of surface patterns using femtosecond laser pulses is area of immense potential as far as different applications are concerned. Here, a study on the influence of femtosecond laser pulses on the surface wetting properties of a polymer namely, polymethylmethacrylate (PMMA) as a function of laser fluence, is investigated by forging grid patterns on its surface. The variation in the wetting properties quantified in terms of static and dynamic contact angles depict a reduced wetting behaviour with laser fluence. The observed behaviour is analogous to the rose petal effect, having both low wettability and high contact angle hysteresis (θH), such that droplet won’t detach from the surface even at an upside down condition. The behaviour could be better explained based on the Cassie impregnated state, resulting in greater pinning of contact line by the surface asperities, confirmed using the AFM studies. However, the replica of patterns onto PDMS (polydimethylsiloxane) shows a contrary wetting behaviour. The replica surfaces show waterrepelling nature similar to the lotus leaf with negligible contact angle hysteresis. The behaviour could be explained on the basis of Cassie-Baxter model, where air entrapment beneath the droplet hinders water impalement into the surface asperities; resulting in high static water contact angle (θe) and low contact angle hysteresis. Such surfaces could find immense potential applications in the field of micro-reactors, self-cleaning surfaces, coating and textile industries, microfluidics, biomedical field and so forth.

Paper Details

Date Published:
Proc. SPIE 10150, Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016), 101500J; doi: 10.1117/12.2248463
Show Author Affiliations
Jijo Easo George, Manipal Univ. (India)
Vanessa R. M. Rodriguez, Manipal Univ. (India)
Santhosh C., Manipal Univ. (India)
Sajan D. George, Manipal Univ. (India)

Published in SPIE Proceedings Vol. 10150:
Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016)
Agus M. Hatta; Aulia M. T. Nasution, Editor(s)

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