Publication

Effects of Silicone Oil on Electrowetting to Actuate a Digital Microfluidic Drop on Paper

조회수 : 29 등록일 : 2018.10.15 00:00

저자 : Cheong, H (Cheong, Haena); Shin, K (Shin, Kwanwoo)
출처 : JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
출판일 : 2018.10.01


Effects of Silicone Oil on Electrowetting to Actuate a Digital Microfluidic Drop on Paper


Cheong, H (Cheong, Haena)1 ] Oh, H (Oh, Hyunju)2 ] Kim, Y (Kim, Yongjun)1 ] Kim, Y (Kim, Yunpyo)1 ] Soum, V (Soum, Veasna)1 ] Choi, JH(Choi, Jae-Hak)3 ] Kwon, OS (Kwon, Oh-Sun)1 ] Shin, K (Shin, Kwanwoo)1 ]


[ 1 ] Sogang Univ, Inst Biol Interfaces, Dept Chem, Seoul 04107, South Korea
[ 2 ] Auburn High Sch, Auburn, AL 36830 USA
[ 3 ] Chungnam Natl Univ, Dept Polymer Sci & Engn, Daejeon 34134, South Korea



The effects of an immiscible, lubricating polydimethylsiloxane fluid, referred to as silicone oil, on the static deformation and on the dynamic motion of a water drop on paper induced by electrowetting were investigated. The deformation of a drop on a hydrophobic film of amorphous fluoropolymers top-coated with less hydrophobic silicone oil was much more predictable, reversible and reproducible than on the uncoated surface. In the dynamic tribological experiment for a sliding drop along an inclined surface, a significant decrease in the friction coefficient, with an unexpected dependency of the contact area, was observed. Based on the curve fitting analysis, the shear stress and the net friction force were estimated quantitatively. Because of the tribological effect and the reduced shear friction force of the oil film, the static and the dynamic electrowetting states of the water drop were enhanced.






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