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Micromachines 2012, 3(2), 427-441; doi:10.3390/mi3020427
Article

Quantitative Studies on PDMS-PDMS Interface Bonding with Piranha Solution and its Swelling Effect

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Received: 10 March 2012; in revised form: 26 April 2012 / Accepted: 26 April 2012 / Published: 4 May 2012
(This article belongs to the Special Issue Polymer MEMS)
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Abstract: In this paper, a low-cost yet effective method of irreversible bonding between two elastomeric polydimethylsiloxane (PDMS) interfaces using Piranha solution is investigated. Piranha solutions at a weight ratio of 3:1 using different acids and hydrogen peroxide were attempted. The average tensile strengths of the device bonded with concentrated sulfuric acid-based piranha solution and nitric acid-based piranha solution were found to be 200 ± 20 kPa and 100 ± 15 kPa respectively. A PDMS surface treated with Piranha Solution demonstrated an increase in hydrophilicity. In addition, relatively straightforward swelling studies of PDMS using a weight loss method with common organic solvents were also investigated. Experimental results show that hexane, toluene, ethyl acetate, n-propyl alcohol and acetone swell PDMS significantly over a duration of up to 1 h and above; PDMS samples reached a steady state of swelling only after 5 min of immersion in other solvents. This will enable researchers to develop devices for the future according to the interaction between the material and the solvents in contact.
Keywords: polydimethylsiloxane (PDMS); swelling; bonding effects; piranha solution polydimethylsiloxane (PDMS); swelling; bonding effects; piranha solution
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Koh, K.-S.; Chin, J.; Chia, J.; Chiang, C.-L. Quantitative Studies on PDMS-PDMS Interface Bonding with Piranha Solution and its Swelling Effect. Micromachines 2012, 3, 427-441.

AMA Style

Koh K-S, Chin J, Chia J, Chiang C-L. Quantitative Studies on PDMS-PDMS Interface Bonding with Piranha Solution and its Swelling Effect. Micromachines. 2012; 3(2):427-441.

Chicago/Turabian Style

Koh, Kai-Seng; Chin, Jitkai; Chia, Joanna; Chiang, Choon-Lai. 2012. "Quantitative Studies on PDMS-PDMS Interface Bonding with Piranha Solution and its Swelling Effect." Micromachines 3, no. 2: 427-441.


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