Ta, VD, Dunn, A, Wasley, TJ et al. (7 more authors) (2016) Laser textured surface gradients. Applied Surface Science, 371. pp. 583-589. ISSN 0169-4332
Abstract
This work demonstrates a novel technique for fabricating surfaces with roughness and wettability gradients and their subsequent applications for chemical sensors. Surface roughness gradients on brass sheets are obtained directly by nanosecond laser texturing. When these structured surfaces are exposed to air, their wettability decreases with time (up to 20 days) achieving both spatial and temporal wettability gradients. The surfaces are responsive to organic solvents. Contact angles of a series of dilute isopropanol solutions decay exponentially with concentration. In particular, a fall of 132° in contact angle is observed on a surface gradient, one order of magnitude higher than the 14° observed for the unprocessed surface, when the isopropanol concentration increased from 0 to 15.6 wt%. As the wettability changes gradually over the surface, contact angle also changes correspondingly. This effect offers multi-sensitivity at different zones on the surface and is useful for accurate measurement of chemical concentration.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Roughness gradients; Wettability gradients; Laser surface texturing; Nanosecond laser; Chemical sensors |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Medical and Biological Engineering (iMBE) (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/L017415/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Apr 2016 15:37 |
Last Modified: | 11 Apr 2018 13:14 |
Published Version: | http://dx.doi.org/10.1016/j.apsusc.2016.03.054 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.apsusc.2016.03.054 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:98451 |