Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/50431
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dc.contributor.authorYong, Chui Shan.
dc.date.accessioned2012-06-04T07:48:29Z
dc.date.available2012-06-04T07:48:29Z
dc.date.copyright2012en_US
dc.date.issued2012
dc.identifier.urihttp://hdl.handle.net/10356/50431
dc.description.abstractThis study investigates the controlled modifications of surface wettability of cyclic olefin polymer (COP) by the use of femtosecond laser pulses at various fluences by changing the defocusing distance. A wide range of water contact angles (WCA) were achieved, surfaces ranged from highly hydrophilic, to hydrophobic, to highly hydrophobic, by varying the defocusing distance. The laser fluence varies indirectly proportionately to the modulus of focal distances. The surface morphology, roughness and stability of the modified COP samples were analyzed to investigate the relations between them and the wetting behavior of laser ablated COP surfaces. WCA of <10° was achieved by irradiating the COP sample at the focal distance. From -0.5 mm to -5 mm and +0.5 mm to +4.5 mm, hydrophobic surfaces were achieved. Among these, the highest WCA attained were 149.3° at defocusing distance of -4 mm.en_US
dc.format.extent67 p.en_US
dc.language.isoenen_US
dc.rightsNanyang Technological University
dc.subjectDRNTU::Engineering::Mechanical engineeringen_US
dc.titleSurface wettability modification of cyclic olefin polymer by femtosecond laser irradiationen_US
dc.typeFinal Year Project (FYP)en_US
dc.contributor.supervisorLam Yee Cheongen_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.degreeBachelor of Engineering (Mechanical Engineering)en_US
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Appears in Collections:MAE Student Reports (FYP/IA/PA/PI)
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