%0 Journal Article
%T Quantitative Studies on PDMS-PDMS Interface Bonding with Piranha Solution and its Swelling Effect
%A Kai-Seng Koh
%A Jitkai Chin
%A Joanna Chia
%A Choon-Lai Chiang
%J Micromachines
%D 2012
%I MDPI AG
%R 10.3390/mi3020427
%X 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 ¡À 20 kPa and 100 ¡À 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.
%K polydimethylsiloxane (PDMS)
%K swelling
%K bonding effects
%K piranha solution
%U http://www.mdpi.com/2072-666X/3/2/427