Modification and characterisation of material hydrophobicity for surface acoustic wave driven microfluidics

Zou, H., Li, Yifan, Smith, Stewart, Bunting, A., Walton, Anthony and Terry, Jonathan (2012) Modification and characterisation of material hydrophobicity for surface acoustic wave driven microfluidics. In: Microelectronic Test Structures (ICMTS), 2012 IEEE International Conference on. IEEE, Piscataway, NJ, pp. 61-65. ISBN 978-1-4673-1027-7

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Surface acoustic waves (SAW) generated in a piezoelectric substrate may be used to manipulate micro-scale droplets of liquid in a digital microfluidic system for lab-on-a-chip applications. The wettability of the surface over which a droplet is driven determines the ease and speed with which the droplet is propelled. This provides the opportunity to achieve fine control of SAW driven droplets simply by patterning of the surface into areas with different levels of wettability. This paper evaluates a number of different materials and surface preparation techniques and assesses their manufacturability and efficacy for this application. Test structures have been designed and developed to help optimise a fabrication process using the biocompatible polymer Parylene. Early results obtained using airflow as a driving force show that it is possible to manipulate droplets through direction changes of up to 60°. Additional work has been done using surface acoustic waves as the driving force to determine the extent to which droplets can be guided to desired locations.

Item Type: Book Section
Additional Information: This paper was presented at 2012 IEEE International Conference on Microelectronic Test Structures, 19-22 March 2012, San Diego.
Subjects: F200 Materials Science
F300 Physics
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Yifan Li
Date Deposited: 26 Feb 2015 15:15
Last Modified: 12 Oct 2019 22:29

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