The University of Southampton
University of Southampton Institutional Repository

Characterisation of an irreversible bonding process for COC–COC and COC–PDMS–COC sandwich structures and application to microvalves

Characterisation of an irreversible bonding process for COC–COC and COC–PDMS–COC sandwich structures and application to microvalves
Characterisation of an irreversible bonding process for COC–COC and COC–PDMS–COC sandwich structures and application to microvalves
A novel technique for bonding heterogeneous cyclic olefin co-polymer (COC) to a thin poly(dimethylsiloxane) (PDMS) membrane is described. This improved bonding technique successfully achieved precise, well-controlled, low temperature bonding of microfluidic channels. Microchannel and fluid control patterns were embossed on a COC substrate by hot embossing technique first. The method uses aminopropyltriethoxysilane (APTES) and 3-glycidoxypropyltrimethoxysilane (GPTMS) in combination to create an irreversible bond between the two materials. The change in surface properties and the influence of different surface chemical groups on surface adhesion properties has been characterised by contact angle, surface energy measurements, scanning electron microscopy (SEM), and atomic force microscopy (AFM), revealing a change in morphology and surface roughness. A lower wettability was also observed along with a reduced hydrophobic recovery of the surfaces. Bonding efficiency of the devices was evaluated by interface evaluation of cross-sectioning, peel off tests and leak tests. In addition, the performance of the bonds achieved after different surface treatments has been compared showing that this technique results in a higher burst pressures than methods applying only oxygen plasma or APTES. Using optimised bonding conditions a robust, effective microvalve made from a PDMS membrane was fabricated and successful valve closing or opening are shown. Because of advantages of facile fabrication, low cost and biocompatibility, this hybrid device can be pave the way in many applications such as fluidic manipulation in portable and disposable microfluidic devices.
Silanization, Surface modification, Microvalves, Hybrid device, Cyclic olefin co-polymer (COC), Fabrication
0925-4005
1473-1480
Cortese, Barbara
db7b299c-bab1-4139-950b-3251c86abf7f
Mowlem, Matt C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Cortese, Barbara
db7b299c-bab1-4139-950b-3251c86abf7f
Mowlem, Matt C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174

Cortese, Barbara, Mowlem, Matt C. and Morgan, Hywel (2011) Characterisation of an irreversible bonding process for COC–COC and COC–PDMS–COC sandwich structures and application to microvalves. Sensors and Actuators B: Chemical, 160 (1), 1473-1480. (doi:10.1016/j.snb.2011.07.040).

Record type: Article

Abstract

A novel technique for bonding heterogeneous cyclic olefin co-polymer (COC) to a thin poly(dimethylsiloxane) (PDMS) membrane is described. This improved bonding technique successfully achieved precise, well-controlled, low temperature bonding of microfluidic channels. Microchannel and fluid control patterns were embossed on a COC substrate by hot embossing technique first. The method uses aminopropyltriethoxysilane (APTES) and 3-glycidoxypropyltrimethoxysilane (GPTMS) in combination to create an irreversible bond between the two materials. The change in surface properties and the influence of different surface chemical groups on surface adhesion properties has been characterised by contact angle, surface energy measurements, scanning electron microscopy (SEM), and atomic force microscopy (AFM), revealing a change in morphology and surface roughness. A lower wettability was also observed along with a reduced hydrophobic recovery of the surfaces. Bonding efficiency of the devices was evaluated by interface evaluation of cross-sectioning, peel off tests and leak tests. In addition, the performance of the bonds achieved after different surface treatments has been compared showing that this technique results in a higher burst pressures than methods applying only oxygen plasma or APTES. Using optimised bonding conditions a robust, effective microvalve made from a PDMS membrane was fabricated and successful valve closing or opening are shown. Because of advantages of facile fabrication, low cost and biocompatibility, this hybrid device can be pave the way in many applications such as fluidic manipulation in portable and disposable microfluidic devices.

Full text not available from this repository.

More information

Published date: 15 December 2011
Keywords: Silanization, Surface modification, Microvalves, Hybrid device, Cyclic olefin co-polymer (COC), Fabrication
Organisations: Electronics & Computer Science, Ocean Technology and Engineering

Identifiers

Local EPrints ID: 210895
URI: https://eprints.soton.ac.uk/id/eprint/210895
ISSN: 0925-4005
PURE UUID: 5786e47e-bc4d-46a6-9dd5-716bfe554c3a
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 10 Feb 2012 13:29
Last modified: 29 Aug 2019 00:44

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×