A novel technique to fabricate magnetic polydimethylsiloxane micropillar
In past decades, polymeric micropillars have been employed in many complex functional micro-devices, such as micro-fluids, micro-sensors, tunable wetting surfaces, and substrate structures. This paper presents a novel technique to fabricate high-aspect-ratio magnetic polydimethylsiloxane (PDMS) micr...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/159527 |
| _version_ | 1811685706747084800 |
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| author | Yang, Xiaoming Zhong, Zhao Wei |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Yang, Xiaoming Zhong, Zhao Wei |
| author_sort | Yang, Xiaoming |
| collection | NTU |
| description | In past decades, polymeric micropillars have been employed in many complex functional micro-devices, such as micro-fluids, micro-sensors, tunable wetting surfaces, and substrate structures. This paper presents a novel technique to fabricate high-aspect-ratio magnetic polydimethylsiloxane (PDMS) micropillars that can move under gradient magnetic fields. First, a drop of Fe3O4 superparamagnetic nanoparticles was dispersed in acetone solution, sonicated, and poured over a pre-etch silicon mold with deep micro-holes. Second, we quickly attracted Fe3O4 nanoparticles in micro-holes with a strong permanent magnet at the silicon mold's backside. Third, we used a soft lithography process to force the PDMS liquid to flow into the micro-holes by sequencing the air in a vacuum chamber, baked in a hot plate, and then peeled off in ethanol solution and dried in a CO2 dryer machine. The diameters of PDMS magnetic micropillars were from 1 μm, 2 μm to 10 μm, and the heights were 30 μm and 50 μm. We observed 1 μm micropillar with 50 aspect ratio could deflect its end up to 12 μm under a gradient magnetic field of 5 mT/mm. The magnetic micropillar end movement in an ethanol solution was validated, which broads the application to micro-fluidics and other liquid microdevices. The energy-dispersive X-ray spectroscopy also examined the iron percentage in PDMS micropillars. They were in a range of 42% to 81.4%; with the median value was 59.6% that is the highest value reported in the literature, to our best knowledge. |
| first_indexed | 2024-10-01T04:48:47Z |
| format | Journal Article |
| id | ntu-10356/159527 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:48:47Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1595272022-06-24T07:33:41Z A novel technique to fabricate magnetic polydimethylsiloxane micropillar Yang, Xiaoming Zhong, Zhao Wei School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Magnetism and Magnetic Properties Mechanical Properties In past decades, polymeric micropillars have been employed in many complex functional micro-devices, such as micro-fluids, micro-sensors, tunable wetting surfaces, and substrate structures. This paper presents a novel technique to fabricate high-aspect-ratio magnetic polydimethylsiloxane (PDMS) micropillars that can move under gradient magnetic fields. First, a drop of Fe3O4 superparamagnetic nanoparticles was dispersed in acetone solution, sonicated, and poured over a pre-etch silicon mold with deep micro-holes. Second, we quickly attracted Fe3O4 nanoparticles in micro-holes with a strong permanent magnet at the silicon mold's backside. Third, we used a soft lithography process to force the PDMS liquid to flow into the micro-holes by sequencing the air in a vacuum chamber, baked in a hot plate, and then peeled off in ethanol solution and dried in a CO2 dryer machine. The diameters of PDMS magnetic micropillars were from 1 μm, 2 μm to 10 μm, and the heights were 30 μm and 50 μm. We observed 1 μm micropillar with 50 aspect ratio could deflect its end up to 12 μm under a gradient magnetic field of 5 mT/mm. The magnetic micropillar end movement in an ethanol solution was validated, which broads the application to micro-fluidics and other liquid microdevices. The energy-dispersive X-ray spectroscopy also examined the iron percentage in PDMS micropillars. They were in a range of 42% to 81.4%; with the median value was 59.6% that is the highest value reported in the literature, to our best knowledge. 2022-06-24T07:33:41Z 2022-06-24T07:33:41Z 2021 Journal Article Yang, X. & Zhong, Z. W. (2021). A novel technique to fabricate magnetic polydimethylsiloxane micropillar. Journal of Applied Polymer Science, 138(20), 50460-. https://dx.doi.org/10.1002/app.50460 0021-8995 https://hdl.handle.net/10356/159527 10.1002/app.50460 2-s2.0-85099239327 20 138 50460 en Journal of Applied Polymer Science © 2021 Wiley Periodicals LLC. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Magnetism and Magnetic Properties Mechanical Properties Yang, Xiaoming Zhong, Zhao Wei A novel technique to fabricate magnetic polydimethylsiloxane micropillar |
| title | A novel technique to fabricate magnetic polydimethylsiloxane micropillar |
| title_full | A novel technique to fabricate magnetic polydimethylsiloxane micropillar |
| title_fullStr | A novel technique to fabricate magnetic polydimethylsiloxane micropillar |
| title_full_unstemmed | A novel technique to fabricate magnetic polydimethylsiloxane micropillar |
| title_short | A novel technique to fabricate magnetic polydimethylsiloxane micropillar |
| title_sort | novel technique to fabricate magnetic polydimethylsiloxane micropillar |
| topic | Engineering::Mechanical engineering Magnetism and Magnetic Properties Mechanical Properties |
| url | https://hdl.handle.net/10356/159527 |
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