Surface Wettability Modification of Cyclic Olefin Polymer by Direct Femtosecond Laser IrradiationReportar como inadecuado


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


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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

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





Autor: Bing Wang 1,2, Xincai Wang 1,3, Hongyu Zheng 1,3 and Yee Cheong Lam 1,2,*

Fuente: http://mdpi.com/



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