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Nanosecond laser textured superhydrophobic metallic surfaces and their chemical sensing applications
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Ta, Duong V., Dunn, Andrew, Wasley, Thomas J., Kay, Robert W., Stringer, Jonathan, Smith, Patrick J., Connaughton, Colm and Shephard, Jonathan D. (2015) Nanosecond laser textured superhydrophobic metallic surfaces and their chemical sensing applications. Applied Surface Science, 357 (Part A). pp. 248-254. doi:10.1016/j.apsusc.2015.09.027 ISSN 0169-4332.
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Official URL: http://dx.doi.org/10.1016/j.apsusc.2015.09.027
Abstract
This work demonstrates superhydrophobic behavior on nanosecond laser patterned copper and brass surfaces. Compared with ultrafast laser systems previously used for such texturing, infrared nanosecond fiber lasers offer a lower cost and more robust system combined with potentially much higher processing rates. The wettability of the textured surfaces develops from hydrophilicity to superhydrophobicity over time when exposed to ambient conditions. The change in the wetting property is attributed to the partial deoxidation of oxides on the surface induced during laser texturing. Textures exhibiting steady state contact angles of up to ∼152° with contact angle hysteresis of around 3–4° have been achieved. Interestingly, the superhydrobobic surfaces have the self-cleaning ability and have potential for chemical sensing applications. The principle of these novel chemical sensors is based on the change in contact angle with the concentration of methanol in a solution. To demonstrate the principle of operation of such a sensor, it is found that the contact angle of methanol solution on the superhydrophobic surfaces exponentially decays with increasing concentration. A significant reduction, of 128°, in contact angle on superhydrophobic brass is observed, which is one order of magnitude greater than that for the untreated surface (12°), when percent composition of methanol reaches to 28%.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||||||||
| Library of Congress Subject Headings (LCSH): | Metals -- Surfaces -- Research, Surfaces (Technology), Lasers , Nanotechnology, Chemical detectors | ||||||||||
| Journal or Publication Title: | Applied Surface Science | ||||||||||
| Publisher: | Elsevier BV | ||||||||||
| ISSN: | 0169-4332 | ||||||||||
| Official Date: | December 2015 | ||||||||||
| Dates: |
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| Volume: | 357 | ||||||||||
| Number: | Part A | ||||||||||
| Page Range: | pp. 248-254 | ||||||||||
| DOI: | 10.1016/j.apsusc.2015.09.027 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
| Date of first compliant deposit: | 2 June 2016 | ||||||||||
| Date of first compliant Open Access: | 3 June 2016 | ||||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||||
| Grant number: | EP/L017431/1, EP/L017350/1, EP/L016907/1 and EP/L017415/1 |
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