Cha, Junghun Kim, Jinseok Ryu, Suk-Kyu Park, Jungyul Jeong, Yongwon Park, Sewan Park, Sukho Kim, Hyeon Cheol Chun, Kukjin 2024-01-21T02:33:10Z 2024-01-21T02:33:10Z 2021-09-01 2006-09 0960-1317 https://pubs.kist.re.kr/handle/201004/135207 This paper presents a novel highly efficient passive micromixer that employs diffusion for micromixing. Since conventional fabrication methods cannot form precise aligned microchannels, the realization of a complex 3D micromixer has been difficult. Here, we report a novel micromixer, named a chessboard mixer. In addition, a new polydimethylsiloxane ( PDMS) bonding method was developed to produce the proposed mixer. The new PDMS bonding technique requires PDMS-to-PDMS bonding and the moldable flexibility of partially cured PDMS to form the structure. Accordingly, a two-step curing process was used to solve these problems. Adhesion control was also considered when forming the PDMS membranes. Complex 3D microchannels in the micromixer were aligned within 1 m using the proposed new bonding method. The presented micromixer could increase the mixing effect by expanding interfaces between mixing fluids. Thus, this mixer makes it possible to mix within a shorter distance than other pre-existing micromixers do. A simulation using computational fluid dynamics (CFD)-ACE software showed a highly efficient performance, and an experiment involving the mixing of NaOH and phenolphthalein confirmed the rapid mixing performance (< 1400 mu m). English IOP PUBLISHING LTD TOTAL ANALYSIS SYSTEMS MICROFLUIDIC MIXER A highly efficient 3D micromixer using soft PDMS bonding Article 10.1088/0960-1317/16/9/004 1 JOURNAL OF MICROMECHANICS AND MICROENGINEERING, v.16, no.9, pp.1778 - 1782 JOURNAL OF MICROMECHANICS AND MICROENGINEERING 16 9 1778 1782 scie scopus 000239774600023 2-s2.0-33747266423 Engineering, Electrical & Electronic Nanoscience & Nanotechnology Instruments & Instrumentation Physics, Applied Engineering Science & Technology - Other Topics Instruments & Instrumentation Physics Article TOTAL ANALYSIS SYSTEMS MICROFLUIDIC MIXER Micromixer Microchannel PDMS CFD-ACE