Study of concentric, eccentric and split type magnetic membrane micro-mixers
Electromagnetically driven elastic magnetic microfluidic mixers were investigated for their performance in air, water and glycerol filled chambers. They were fabricated by embedding flexible magnets in polydimethylsiloxane (PDMS) membrane. At a driving frequency of 100 Hz, oscillating fluid flow was...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2018-06-01
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| Series: | Sensing and Bio-Sensing Research |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S221418041730209X |
| _version_ | 1811209952083050496 |
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| author | Shao Qiang Tang King Ho Holden Li Ze Ting Yeo Wei Xuan Chan Say Hwa Tan Yong-Jin Yoon Sum Huan Ng |
| author_facet | Shao Qiang Tang King Ho Holden Li Ze Ting Yeo Wei Xuan Chan Say Hwa Tan Yong-Jin Yoon Sum Huan Ng |
| author_sort | Shao Qiang Tang |
| collection | DOAJ |
| description | Electromagnetically driven elastic magnetic microfluidic mixers were investigated for their performance in air, water and glycerol filled chambers. They were fabricated by embedding flexible magnets in polydimethylsiloxane (PDMS) membrane. At a driving frequency of 100 Hz, oscillating fluid flow was induced and mixing was achieved. Three designs were fabricated and studied: a) concentric type with the magnetic material in the center of the membrane, b) eccentric type with the magnetic material offset from the center of the membrane and c) split type with two regions of magnetic materials with opposing polarities. The split configuration provides additional fluid folding, facilitating mixing of the 20 μL fluorescent dye in 60 μL of solvent. Simulation and experimental results show that the eccentric and split designs were able to achieve a 20–30% reduction in mixing time compared to the concentric design. At the same magnetic flux density, the eccentric type design exhibited the greatest deflection, explaining the better mixing achieved over the concentric type design. The split type design, having the lowest deflection, was able to perform better and more consistently than the eccentric type design by creating a “micro rocker mixer” effect. We postulated that the shapes of the deflection profiles in the eccentric and split designs contributed to the mixing efficiency by promoting better chaotic advection than the concentric design. |
| first_indexed | 2024-04-12T04:47:55Z |
| format | Article |
| id | doaj.art-4a71564c89a345cbb1ff5d500ae5e38c |
| institution | Directory Open Access Journal |
| issn | 2214-1804 |
| language | English |
| last_indexed | 2024-04-12T04:47:55Z |
| publishDate | 2018-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Sensing and Bio-Sensing Research |
| spelling | doaj.art-4a71564c89a345cbb1ff5d500ae5e38c2022-12-22T03:47:25ZengElsevierSensing and Bio-Sensing Research2214-18042018-06-01191423Study of concentric, eccentric and split type magnetic membrane micro-mixersShao Qiang Tang0King Ho Holden Li1Ze Ting Yeo2Wei Xuan Chan3Say Hwa Tan4Yong-Jin Yoon5Sum Huan Ng6School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, SingaporeSchool of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore; Corresponding authors.School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, SingaporeSchool of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, SingaporeQueensland Micro- and Nanotechnology Centre, Nathan Campus, Griffith University, 170 Kessels Road, QLD 4111, AustraliaSchool of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, SingaporeA*STAR's Singapore Institute of Manufacturing Technology (SIMTech), 2 Fusionopolis Way, #08-04, Innovis, 138634, Singapore; Corresponding authors.Electromagnetically driven elastic magnetic microfluidic mixers were investigated for their performance in air, water and glycerol filled chambers. They were fabricated by embedding flexible magnets in polydimethylsiloxane (PDMS) membrane. At a driving frequency of 100 Hz, oscillating fluid flow was induced and mixing was achieved. Three designs were fabricated and studied: a) concentric type with the magnetic material in the center of the membrane, b) eccentric type with the magnetic material offset from the center of the membrane and c) split type with two regions of magnetic materials with opposing polarities. The split configuration provides additional fluid folding, facilitating mixing of the 20 μL fluorescent dye in 60 μL of solvent. Simulation and experimental results show that the eccentric and split designs were able to achieve a 20–30% reduction in mixing time compared to the concentric design. At the same magnetic flux density, the eccentric type design exhibited the greatest deflection, explaining the better mixing achieved over the concentric type design. The split type design, having the lowest deflection, was able to perform better and more consistently than the eccentric type design by creating a “micro rocker mixer” effect. We postulated that the shapes of the deflection profiles in the eccentric and split designs contributed to the mixing efficiency by promoting better chaotic advection than the concentric design.http://www.sciencedirect.com/science/article/pii/S221418041730209X |
| spellingShingle | Shao Qiang Tang King Ho Holden Li Ze Ting Yeo Wei Xuan Chan Say Hwa Tan Yong-Jin Yoon Sum Huan Ng Study of concentric, eccentric and split type magnetic membrane micro-mixers Sensing and Bio-Sensing Research |
| title | Study of concentric, eccentric and split type magnetic membrane micro-mixers |
| title_full | Study of concentric, eccentric and split type magnetic membrane micro-mixers |
| title_fullStr | Study of concentric, eccentric and split type magnetic membrane micro-mixers |
| title_full_unstemmed | Study of concentric, eccentric and split type magnetic membrane micro-mixers |
| title_short | Study of concentric, eccentric and split type magnetic membrane micro-mixers |
| title_sort | study of concentric eccentric and split type magnetic membrane micro mixers |
| url | http://www.sciencedirect.com/science/article/pii/S221418041730209X |
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