Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field
A significant growth of research on digital microfluidics has been achieved over the past several decades, and the field is still attracting increasing attention for fulfilling relevant mechanisms and potential applications. Numerous studies have been devoted to actively manipulating droplets in a v...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-09-01
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| Series: | Magnetochemistry |
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| Online Access: | https://www.mdpi.com/2312-7481/9/10/215 |
| _version_ | 1797573167941681152 |
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| author | Gui-Ping Zhu Shi-Hua Wu Shu-Ze Zheng Lai Li Nam-Trung Nguyen |
| author_facet | Gui-Ping Zhu Shi-Hua Wu Shu-Ze Zheng Lai Li Nam-Trung Nguyen |
| author_sort | Gui-Ping Zhu |
| collection | DOAJ |
| description | A significant growth of research on digital microfluidics has been achieved over the past several decades, and the field is still attracting increasing attention for fulfilling relevant mechanisms and potential applications. Numerous studies have been devoted to actively manipulating droplets in a variety of fundamental and applicational scenarios. In this work, the deformation of ferromagnetic fluid droplets is studied under an external uniform magnetic field. The droplets are precisely dispersed on the bottom surface of a container assembled with polymer methacrylate (PMMA) plates. Mineral oil is applied instead of air as the surrounding medium for easy stretching and preventing water solvent evaporation in ferrofluid. The design and processing of the container are firstly carried out to observe the shape and characterize the wettability of the droplets in the immiscible mineral oil medium. Furthermore, the droplets’ deformation and the working mechanism are given under the action of the horizontal uniform magnetic field. At different magnetic field intensities, the droplet is stretched in the horizontal direction parallel to the applied field. Due to volume conservation, the dimension in the height reduces correspondingly. With the coupling effect of magnetic force, viscous force and interfacial tension, the contact angle first increases with the magnetic field and then basically remains unchanged upon magnetization saturation. Consistent with the experimental results, the numerical method clearly reveals the field coupling mechanism and the nonlinear deformation of the sessile droplet. |
| first_indexed | 2024-03-10T21:05:56Z |
| format | Article |
| id | doaj.art-9192dfd3db554c8080e5bd81aa76595d |
| institution | Directory Open Access Journal |
| issn | 2312-7481 |
| language | English |
| last_indexed | 2024-03-10T21:05:56Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Magnetochemistry |
| spelling | doaj.art-9192dfd3db554c8080e5bd81aa76595d2023-11-19T17:09:02ZengMDPI AGMagnetochemistry2312-74812023-09-0191021510.3390/magnetochemistry9100215Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic FieldGui-Ping Zhu0Shi-Hua Wu1Shu-Ze Zheng2Lai Li3Nam-Trung Nguyen4College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCollege of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaQueensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessels Road, Nathan, QLD 4111, AustraliaA significant growth of research on digital microfluidics has been achieved over the past several decades, and the field is still attracting increasing attention for fulfilling relevant mechanisms and potential applications. Numerous studies have been devoted to actively manipulating droplets in a variety of fundamental and applicational scenarios. In this work, the deformation of ferromagnetic fluid droplets is studied under an external uniform magnetic field. The droplets are precisely dispersed on the bottom surface of a container assembled with polymer methacrylate (PMMA) plates. Mineral oil is applied instead of air as the surrounding medium for easy stretching and preventing water solvent evaporation in ferrofluid. The design and processing of the container are firstly carried out to observe the shape and characterize the wettability of the droplets in the immiscible mineral oil medium. Furthermore, the droplets’ deformation and the working mechanism are given under the action of the horizontal uniform magnetic field. At different magnetic field intensities, the droplet is stretched in the horizontal direction parallel to the applied field. Due to volume conservation, the dimension in the height reduces correspondingly. With the coupling effect of magnetic force, viscous force and interfacial tension, the contact angle first increases with the magnetic field and then basically remains unchanged upon magnetization saturation. Consistent with the experimental results, the numerical method clearly reveals the field coupling mechanism and the nonlinear deformation of the sessile droplet.https://www.mdpi.com/2312-7481/9/10/215microfluidicsmagnetic fieldsessile dropletwettingprofile deformation |
| spellingShingle | Gui-Ping Zhu Shi-Hua Wu Shu-Ze Zheng Lai Li Nam-Trung Nguyen Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field Magnetochemistry microfluidics magnetic field sessile droplet wetting profile deformation |
| title | Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field |
| title_full | Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field |
| title_fullStr | Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field |
| title_full_unstemmed | Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field |
| title_short | Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field |
| title_sort | investigation of ferrofluid sessile droplet tensile deformation in a uniform magnetic field |
| topic | microfluidics magnetic field sessile droplet wetting profile deformation |
| url | https://www.mdpi.com/2312-7481/9/10/215 |
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