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Long-lasting FR-4 surface hydrophilisation towards commercial PCB passive microfluidics

Vasilakis, N, Moschou, D, Carta, Daniela, Morgan, H and Prodromakis, T (2015) Long-lasting FR-4 surface hydrophilisation towards commercial PCB passive microfluidics Applied Surface Science, 368. pp. 69-75.

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Abstract

Printed circuit boards (PCB) technologies are an attractive system for simple sensing and microfluidic systems. Controlling the surface properties of PCB material is an important part of this technology and to date there has been no study on long-term hydrophilisation stability of these materials. In this work, the effect of different oxygen plasma input power and treatment duration times on the wetting properties of FR-4 surfaces was investigated by sessile droplet contact angle measurements. Super and weakly hydrophilic behaviour was achieved and the retention time of these properties was studied, with the hydrophilic nature being retained for at least 26 days. To demonstrate the applicability of this treatment method, a commercially manufactured microfluidic structure made from a multilayer PCB (3-layer FR-4 stack) was exposed to oxygen plasma at the optimum conditions. The structures could be filled with deionised (DI) water under capillary flow unlike the virgin devices.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Vasilakis, NUNSPECIFIEDUNSPECIFIED
Moschou, DUNSPECIFIEDUNSPECIFIED
Carta, Danielad.carta@surrey.ac.ukUNSPECIFIED
Morgan, HUNSPECIFIEDUNSPECIFIED
Prodromakis, TUNSPECIFIEDUNSPECIFIED
Date : 21 December 2015
Identification Number : 10.1016/j.apsusc.2015.12.123
Uncontrolled Keywords : PCB microfluidics; Oxygen plasma; Surface modification; Hydrophilic; Passive microfluidics; Hydrophilicity retention
Depositing User : Jane Hindle
Date Deposited : 04 Sep 2017 13:32
Last Modified : 04 Sep 2017 14:50
URI: http://epubs.surrey.ac.uk/id/eprint/842156

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