PDMS Based Coplanar Microfluidic Channels for the Surface Reduction of Oxidized Galinstan

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dc.contributor.authorLi, G.en_US
dc.contributor.authorParmar, M.en_US
dc.contributor.authorKim, Daeyoungen_US
dc.contributor.authorLee, Jeong-Bongen_US
dc.contributor.authorLee, D. -Wen_US
dc.date.accessioned2014-08-12T15:09:17Z
dc.date.available2014-08-12T15:09:17Z
dc.date.created2013-10-01
dc.date.submitted2013-18-16en_US
dc.description.abstractGalinstan has the potential to replace mercury-one of the most popular liquid metals. However, the easy oxidation of Galinstan restricts wide applicability of the material. In this paper, we report an effective reduction method for the oxidized Galinstan using gas permeable PDMS (polydimethlysiloxane)-based microfluidic channel. The complete study is divided into two parts-reduction of Galinstan oxide and behavior of reduced Galinstan oxide in a microfluidic channel. The reduction of Galinstan oxide is discussed on the basis of static as well as dynamic angles. The contact angle analyses help to find the extent of reduction by wetting characteristics of the oxide, to optimize PDMS thickness and to select suitable hydrochloric acid (HCl) concentration. The highest advancing angle of 155° and receding angle of 136° is achieved with 200 μm thick PDMS film and 37 wt% (weight percent) HCl solution. The behavior of reduced Galinstan oxide is analyzed in PDMS-based coplanar microfluidic channels fabricated using a simple micromolding technique. Galinstan in the microfluidic channel is surrounded by another coplanar channel filled with HCl solution. Due to the excellent permeability of PDMS, HCl permeates through the PDMS wall between the two channels (interchannel PDMS wall) and achieves a continuous chemical reaction with oxidized Galinstan. A Lab VIEW controlled syringe pump is used for observing the behavior of HCl treated Galinstan in the microfluidic channel. Further optimization of the microfluidic device has been conducted to minimize the reoxidation of reduced Galinstan oxide in the microfluidic channel.en_US
dc.description.sponsorship"This work was supported by the WCU (World Class University) program through the National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (no. R 32-20087). The National Research Foundation of Korea (NRF) grant through the Korean government (MEST) (no. 2012R1A2A2A01014711) has also funded in the present study."en_US
dc.identifier.citationLi, G., M. Parmar, D. Kim, J. -B Lee, et al. 2014. "PDMS based coplanar microfluidic channels for the surface reduction of oxidized Galinstan." 14(1): 200-209en_US
dc.identifier.issn1473-0197en_US
dc.identifier.issue1en_US
dc.identifier.startpage200en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/3862
dc.identifier.volume14en_US
dc.language.isoenen_US
dc.relation.urihttp://dx.doi.org/10.1039/c3lc50952den_US
dc.rights©2014 The Royal Society of Chemistry. This article may not be further made available or distributeden_US
dc.source.journalLab on a Chipen_US
dc.subjectGalinstanen_US
dc.subjectHydrochloric acid (HCl)en_US
dc.subjectPolydimethylsiloxane (PDMS)en_US
dc.subjectOxidationen_US
dc.subjectContact angleen_US
dc.titlePDMS Based Coplanar Microfluidic Channels for the Surface Reduction of Oxidized Galinstanen_US
dc.typetexten_US
dc.type.genrearticleen_US

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