Microfluidic device for multilayer coating of magnetic microparticles

Amaury de Hemptinne; Pierre Philippe Gelin; Iwona Ziemecka; Wim De Malsche

doi:10.1016/j.powtec.2023.118223

Microfluidic device for multilayer coating of magnetic microparticles

Amaury de Hemptinne, Pierre Philippe Gelin, Iwona Ziemecka, Wim De Malsche

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Abstract

In this work, a microfluidic chip was developed taking advantage of magnetic fields for Layer-by-Layer assembly. We demonstrate the coating of four layers at the surface of magnetic particles.
Our chip unit accommodates three parallel liquid streams, with two reactant solutions separated by a washing solution. Particles are carried by the axially oriented flow and are deflected laterally in a perpendicular direction to the flow by the magnetic field of external magnets. Particles follow a zigzag pattern and switch from liquid stream to liquid stream. A layer is adsorbed on the particles during each passage in the reacting solutions. To minimize diffusion of liquids, the streams are separated by walls, except near particle exchange regions. This allows to increase the number of chip units placed in series, thus increasing the number of coated layers.

Original language	English
Article number	118223
Pages (from-to)	889-890
Number of pages	2
Journal	Powder Technology
Volume	416
Issue number	1
DOIs	https://doi.org/10.1016/j.powtec.2023.118223
Publication status	Published - 15 Feb 2023

Bibliographical note

Funding Information:
We would like to acknowledge Innoviris for the funding of this project (BRIDGE – Colores project) and the Research Foundation – Flanders (FWO) for the Grant Krediet aan Navorsers ( 1512018N ). We are grateful to the μFlow group members for constructive critics, advice and support.

Publisher Copyright:
© 2023

Copyright:
Copyright 2023 Elsevier B.V., All rights reserved.

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10.1016/j.powtec.2023.118223

Preprint versionPaper sublission V2 (Microfluidic device for multilayer coating of magnetic microparticles)Accepted author manuscript, 1.24 MBLicence: CC BY-NC-ND

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abstract = "In this work, a microfluidic chip was developed taking advantage of magnetic fields for Layer-by-Layer assembly. We demonstrate the coating of four layers at the surface of magnetic particles.Our chip unit accommodates three parallel liquid streams, with two reactant solutions separated by a washing solution. Particles are carried by the axially oriented flow and are deflected laterally in a perpendicular direction to the flow by the magnetic field of external magnets. Particles follow a zigzag pattern and switch from liquid stream to liquid stream. A layer is adsorbed on the particles during each passage in the reacting solutions. To minimize diffusion of liquids, the streams are separated by walls, except near particle exchange regions. This allows to increase the number of chip units placed in series, thus increasing the number of coated layers.",

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AU - Ziemecka, Iwona

AU - De Malsche, Wim

N1 - Funding Information: We would like to acknowledge Innoviris for the funding of this project (BRIDGE – Colores project) and the Research Foundation – Flanders (FWO) for the Grant Krediet aan Navorsers ( 1512018N ). We are grateful to the μFlow group members for constructive critics, advice and support. Publisher Copyright: © 2023 Copyright: Copyright 2023 Elsevier B.V., All rights reserved.

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N2 - In this work, a microfluidic chip was developed taking advantage of magnetic fields for Layer-by-Layer assembly. We demonstrate the coating of four layers at the surface of magnetic particles.Our chip unit accommodates three parallel liquid streams, with two reactant solutions separated by a washing solution. Particles are carried by the axially oriented flow and are deflected laterally in a perpendicular direction to the flow by the magnetic field of external magnets. Particles follow a zigzag pattern and switch from liquid stream to liquid stream. A layer is adsorbed on the particles during each passage in the reacting solutions. To minimize diffusion of liquids, the streams are separated by walls, except near particle exchange regions. This allows to increase the number of chip units placed in series, thus increasing the number of coated layers.

AB - In this work, a microfluidic chip was developed taking advantage of magnetic fields for Layer-by-Layer assembly. We demonstrate the coating of four layers at the surface of magnetic particles.Our chip unit accommodates three parallel liquid streams, with two reactant solutions separated by a washing solution. Particles are carried by the axially oriented flow and are deflected laterally in a perpendicular direction to the flow by the magnetic field of external magnets. Particles follow a zigzag pattern and switch from liquid stream to liquid stream. A layer is adsorbed on the particles during each passage in the reacting solutions. To minimize diffusion of liquids, the streams are separated by walls, except near particle exchange regions. This allows to increase the number of chip units placed in series, thus increasing the number of coated layers.

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JO - Powder Technology

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Microfluidic device for multilayer coating of magnetic microparticles

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