Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment
This study investigated the use of ultrashort femtosecond laser pulses to induce either hydrophilic or hydrophobic surfaces on polycarbonate (PC). It has been observed that controlled modification of wettability could be achieved over a wide range of water contact angle (WCA) from below 5° to above...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/143887 |
| _version_ | 1811679152788471808 |
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| author | Chen, Guojie Wang, Z. K. Zheng, H. Y. Thwe, A. M. Lam, Yee Cheong |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Chen, Guojie Wang, Z. K. Zheng, H. Y. Thwe, A. M. Lam, Yee Cheong |
| author_sort | Chen, Guojie |
| collection | NTU |
| description | This study investigated the use of ultrashort femtosecond laser pulses to induce either hydrophilic or hydrophobic surfaces on polycarbonate (PC). It has been observed that controlled modification of wettability could be achieved over a wide range of water contact angle (WCA) from below 5° to above 150°. It has been shown that the pulse energy fluence and total energy deposition onto PC are the important factors in determining the laser-PC interaction, and therefore the different level of wettability on PC surface. XPS-spectra measurement indicates that the modification was caused dominantly by laser induced chemical bond changes. The changes in surface morphology may not noticeably contribute to the surface wettability. The stability investigation on the wetting property of laser modified surfaces has shown that ultrasonication in DI water or in ethanol led to decrease in hydrophobicity, and the decrease was more pronounced for super-hydrophobic surfaces. The level of hydrophilicity decreased as well for the laser induced hydrophilic surfaces. However, the change in hydrophobicity by post-treatment was not significant. The results would be useful in microfluidic chip design and fabrication with controlled surface wetting properties. |
| first_indexed | 2024-10-01T03:04:37Z |
| format | Journal Article |
| id | ntu-10356/143887 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:04:37Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1438872023-03-04T17:22:10Z Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment Chen, Guojie Wang, Z. K. Zheng, H. Y. Thwe, A. M. Lam, Yee Cheong School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Polymer Surface Surface Morphology This study investigated the use of ultrashort femtosecond laser pulses to induce either hydrophilic or hydrophobic surfaces on polycarbonate (PC). It has been observed that controlled modification of wettability could be achieved over a wide range of water contact angle (WCA) from below 5° to above 150°. It has been shown that the pulse energy fluence and total energy deposition onto PC are the important factors in determining the laser-PC interaction, and therefore the different level of wettability on PC surface. XPS-spectra measurement indicates that the modification was caused dominantly by laser induced chemical bond changes. The changes in surface morphology may not noticeably contribute to the surface wettability. The stability investigation on the wetting property of laser modified surfaces has shown that ultrasonication in DI water or in ethanol led to decrease in hydrophobicity, and the decrease was more pronounced for super-hydrophobic surfaces. The level of hydrophilicity decreased as well for the laser induced hydrophilic surfaces. However, the change in hydrophobicity by post-treatment was not significant. The results would be useful in microfluidic chip design and fabrication with controlled surface wetting properties. Agency for Science, Technology and Research (A*STAR) Accepted version This study was supported by A*STAR Singapore Institute of Manufacturing Technology SIMTech, Project No. C09-M-052, and Guangdong Science and Technology Department, China, Project No. 2016B01011304. The authors are grateful to Ms. June ONG Lay Ting of A*STAR Institute of Materials Research and Engineering for XPS measurements and analyses. 2020-09-29T08:05:13Z 2020-09-29T08:05:13Z 2019 Journal Article Chen, G., Wang, Z. K., Zheng, H. Y., Thwe, A. M., & Lam, Y. C. (2019). Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment. Optics & Laser Technology, 115, 316–324. doi:10.1016/j.optlastec.2019.02.032 0030-3992 https://hdl.handle.net/10356/143887 10.1016/j.optlastec.2019.02.032 115 316 324 en Optics & Laser Technology © 2019 Elsevier Ltd. All rights reserved. This paper was published in Optics & Laser Technology and is made available with permission of Elsevier Ltd. application/pdf |
| spellingShingle | Engineering::Mechanical engineering Polymer Surface Surface Morphology Chen, Guojie Wang, Z. K. Zheng, H. Y. Thwe, A. M. Lam, Yee Cheong Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment |
| title | Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment |
| title_full | Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment |
| title_fullStr | Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment |
| title_full_unstemmed | Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment |
| title_short | Investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment |
| title_sort | investigation on polycarbonate surface wetting property with femtosecond laser irradiation and ultrasonic treatment |
| topic | Engineering::Mechanical engineering Polymer Surface Surface Morphology |
| url | https://hdl.handle.net/10356/143887 |
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