Magnetic filtration of phase separating ferrofluids: From basic concepts to microfluidic device / Kuzhir P.,Magnet C.,Ezzaier H.,Zubarev A.,Bossis G. // JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - 2017. - V. 431, l. . - P. 84-90.

ISSN/EISSN:

0304-8853 / 1873-4766

Type:

Article; Proceedings Paper

Abstract:

In this work, we briefly review magnetic separation of ferrofluids composed of large magnetic particles (60 nm of the average size) possessing an induced dipole moment. Such ferrofluids exhibit field-induced phase separation at relatively low particle concentrations (similar to 0.8 vol\%) and magnetic fields (similar to 10 kA/m). Particle aggregates appearing during the phase separation are extracted from the suspending fluid by magnetic field gradients much easier than individual nanoparticles in the absence of phase separation. Nanoparticle capture by a single magnetized microbead and by multi-collector systems (packed bed of spheres and micro-pillar array) has been studied both experimentally and theoretically. Under flow and magnetic fields, the particle capture efficiency Lambda decreases with an increasing Mason number for all considered geometries. This decrease may become stronger for aggregated magnetic particles (Lambda proportional to Ma(-1.7)) than for individual ones (Lambda proportional to Ma(-1)) if the shear fields are strong enough to provoke aggregate rupture. These results can be useful for development of new magneto-microfluidic immunoassays based on magnetic nanoparticles offering a much better sensitivity as compared to presently used magnetic microbeads. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

Phase separation; Ferrofluid; Magnetic colloids; Magnetic separation

DOI:

10.1016/j.jmmm.2016.08.054

Web of Science ID:

ISI:000399598600022

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUN 1
Note	14th International Conference on Magnetic Fluids (ICMF), Ekaterinburg, RUSSIA, JUL 04-08, 2016
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-4766
Research-Areas	Materials Science; Physics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Physics, Condensed Matter
Author-Email	kuzhir@unice.fr
ORCID-Numbers	Kuzhir, Pavel/0000-0001-7089-6197
Funding-Acknowledgement	French RENATECH network {[}P-1400695]; PEPS-INSIS project of CNRS; Russian Scientific Foundation {[}14-19-00989]; FSB throug hits PhD collaboration fellowship
Funding-Text	We are grateful to master students Y. Bourras, S. Nave, M. Acouala and G. Orlandi for experimental measurements. This work has been partially supported by the French RENATECH network and its FEMTO-ST technological facility(project number P-1400695), by the PEPS-INSIS project of CNRS and by the Russian Scientific Foundation(projectno. 14-19-00989). One of the authors (H.E.) acknowledges FSB throug hits PhD collaboration fellowship.
Number-of-Cited-References	20
Usage-Count-Last-180-days	6
Usage-Count-Since-2013	6
Journal-ISO	J. Magn. Magn. Mater.
Doc-Delivery-Number	ES5QV