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Nanomaterials 2015, 5(3), 1442-1453; doi:10.3390/nano5031442

Surface Wettability Modification of Cyclic Olefin Polymer by Direct Femtosecond Laser Irradiation

1
SIMTech-NTU Joint Laboratory (Precision Machining), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
3
Singapore Institute of Manufacturing Technology (SIMTech), 71 Nanyang Drive, Singapore 638075, Singapore
*
Author to whom correspondence should be addressed.
Academic Editor: Subramanian Tamil Selvan
Received: 16 July 2015 / Revised: 21 August 2015 / Accepted: 24 August 2015 / Published: 28 August 2015
(This article belongs to the Special Issue Nanoparticles in Theranostics)
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Abstract

The effect of laser irradiation on surface wettability of cyclic olefin polymer (COP) was investigated. Under different laser parameters, a superhydrophilic or a superhydrophobic COP surface with a water contact angle (WCA) of almost 0° or 163°, respectively, could be achieved by direct femtosecond laser irradiation. The laser power deposition rate (PDR) was found to be a key factor on the wettability of the laser-treated COP surface. The surface roughness and surface chemistry of the laser-irradiated samples were characterized by surface profilometer and X-ray photoelectron spectroscopy, respectively; they were found to be responsible for the changes of the laser-induced surface wettability. The mechanisms involved in the laser surface wettability modification process were discussed. View Full-Text
Keywords: femtosecond pulsed laser; laser power deposition rate (PDR); cyclic olefin polymer (COP); wettability; surface modification femtosecond pulsed laser; laser power deposition rate (PDR); cyclic olefin polymer (COP); wettability; surface modification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, B.; Wang, X.; Zheng, H.; Lam, Y.C. Surface Wettability Modification of Cyclic Olefin Polymer by Direct Femtosecond Laser Irradiation. Nanomaterials 2015, 5, 1442-1453.

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