Journal article
Migration of magnetic microparticles through a liquid–liquid interface under an external magnetic field
- Abstract:
- Liquid–liquid interfaces play a pivotal role in various microfluidic processes involving microparticles, including coating, dissolution, controlled release of polyelectrolytes or drugs, and self-assembly processes. In all of these cases, non-invasive techniques to manipulate the microparticle transport are essential. Magnetic manipulation offers an accessible and straightforward means of controlling the motion of magnetic particles within microfluidic devices. Magnetic microparticles are commonly used for conformal polyelectrolyte coating and drug encapsulation by passing them through a liquid–liquid interface, due to their high saturation magnetization, stability, and low toxicity. In this work, we draw inspiration from the lack of studies on the behaviour of magnetic particles near a liquid–liquid interface under conditions of low Reynolds numbers and high capillary action, despite its engineering relevance in microfluidic systems. We consider a canonical flow configuration in which particle motion is driven by the stagnation-point flow that is generated when two different liquids flow towards one another. We show how the operating conditions dictate whether the particle will pierce the interface and become coated or not and illustrate this via parameter-space plots. We use the results of this analysis to understand how the operating conditions influence the fraction of particles that pass through the liquid–liquid interface and are conformally coated, which may be used to guide a variety of industrial processes.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Version of record, pdf, 3.6MB, Terms of use)
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- Publisher copy:
- 10.1063/5.0250330
Authors
- Publisher:
- American Institute of Physics
- Journal:
- Physics of Fluids More from this journal
- Volume:
- 37
- Article number:
- 022010
- Publication date:
- 2025-02-05
- Acceptance date:
- 2025-01-04
- DOI:
- EISSN:
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1089-7666
- ISSN:
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1070-6631
- Language:
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English
- Keywords:
- Pubs id:
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2074468
- Local pid:
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pubs:2074468
- Deposit date:
-
2025-01-05
Terms of use
- Copyright holder:
- Mondal et al.
- Copyright date:
- 2025
- Rights statement:
- © 2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
- Notes:
- The author accepted manuscript (AAM) of this paper has been made available under the University of Oxford’s Open Access Publications Policy, and a CC BY public copyright licence has been applied.
- Licence:
- CC Attribution (CC BY)
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