Quantitative studies on PDMS-PDMS interface bonding with piranha solution and its swelling effect

Kai Seng Koh, Jitkai Chin, Joanna Chia, Choon Lai Chiang

Research output: Contribution to journalArticle

45 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)427-441
Number of pages15
JournalMicromachines
Volume3
Issue number2
DOIs
Publication statusPublished - 4 May 2012
Externally publishedYes

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