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We have investigated the compatibility of some organic solvents commonly used in electrochemistry with microfluidic channels based on poly(dimethylsiloxane) (PDMS) and compared the stability of electrochemical measurements over several hours with how much PDMS swells when immersed in these solvents. Lee et al. (Anal Chem 75: 6544–6554. doi:10.1021/ac0346712, 2003) have shown that there is a good correlation between swelling of PDMS and the solubility parameter (δH) of the various solvents and suggested that δH can function as an indication of PDMS compatibility. We show that solvents with a very high swelling ratio can give stable voltammetry over several hours, and thus, we do not find that swelling is a good measure for compatibility with PDMS in electrochemical experiments.

Compatibility of organic solvents for electrochemical measurements in PDMS-based microfluidic devices