Ta, Van Duong, Dunn, Andrew, Wasley, Thomas J., Li, Ji, Kay, Robert W., Stringer, Jonathan, Smith, Patrick J., Esenturk, Emre, Connaughton, Colm and Shephard, Jonathan D. (2016) Laser textured surface gradients. Applied Surface Science, 371 . pp. 583-589. doi:10.1016/j.apsusc.2016.03.054

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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.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Centre for Complexity Science Faculty of Science > Mathematics
Library of Congress Subject Headings (LCSH):	Surfaces (Technology), Surface roughness, Lasers, Nanotechnology , Chemical detectors
Journal or Publication Title:	Applied Surface Science
Publisher:	Elsevier BV
ISSN:	0169-4332
Official Date:	15 May 2016
Dates:	Date Event 15 May 2016 Published 9 March 2016 Available 5 March 2016 Accepted 11 January 2016 Submitted
Date of first compliant deposit:	2 June 2016
Volume:	371
Page Range:	pp. 583-589
DOI:	10.1016/j.apsusc.2016.03.054
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
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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