Lee, Kangsun Kim, Choong Shin, Kyeong Sik Lee, JinWoo Ju, Byeong-Kwon Kim, Tae Song Lee, Seung-Ki Kang, Ji Yoon 2024-01-21T00:35:03Z 2024-01-21T00:35:03Z 2021-09-02 2007-08 0960-1317 https://pubs.kist.re.kr/handle/201004/134247 A novel fabrication technique was developed to fabricate round microchannels and applied to a micro mixer having a barrier structure using surface tension of PDMS. When the solidified PDMS layer (channel layer) contacts the liquid PDMS film (meniscus layer), a meniscus is formed around the sidewall in the microchannel due to surface tension. The external load pressure and contact area of the channel layer were adjusted to form various cross-sectional shapes such as a U shape, ellipse, semi-circle and circle. Since the width of the channel also determines the depth formed by the difference in capillary height, a multi-depth channel can be fabricated using a one-step process. It was applied to a dual-depth serpentine mixer, eliminating the aligned bonding of conventional soft lithography. The 3D-structure mixer enhanced mixing performance in the range of Re > 10 compared with a 2D-structure. It could fully mix phenolphthalein and sodium hydroxide when the Reynolds number was 80. The suggested fabrication method could be very useful in various microfluidic devices that need round corners and multi-depth channels. English IOP PUBLISHING LTD MICROFLUIDIC MIXER MICROCHANNELS POLY(DIMETHYLSILOXANE) MICROMIXER VALVES SCALE Fabrication of round channels using the surface tension of PDMS and its application to a 3D serpentine mixer Article 10.1088/0960-1317/17/8/016 1 JOURNAL OF MICROMECHANICS AND MICROENGINEERING, v.17, no.8, pp.1533 - 1541 JOURNAL OF MICROMECHANICS AND MICROENGINEERING 17 8 1533 1541 scie scopus 000248776800016 2-s2.0-34547657521 Engineering, Electrical & Electronic Nanoscience & Nanotechnology Instruments & Instrumentation Physics, Applied Engineering Science & Technology - Other Topics Instruments & Instrumentation Physics Article MICROFLUIDIC MIXER MICROCHANNELS POLY(DIMETHYLSILOXANE) MICROMIXER VALVES SCALE PDMS serpentine mixer surface tension round channels