Magnetic-field assisted mixing of liquids using magnetic nanoparticles |
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| Affiliation: | 2. Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil;3. Harvard Medical School, Boston, Massachusetts;4. Gilead Sciences, Inc., Foster City and Fremont, California;2. Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil;3. Harvard Medical School, Boston, Massachusetts;4. Gilead Sciences, Inc, Foster City and Fremont, California;1. Université M’Hamed Bougara de Boumerdes, Faculté des sciences, Département de Physique, Siège (ex-INIL), Boumerdes 35000, Algeria;2. Faculté de Physique, Université des Sciences et de la Technologie Houari Boumedienne, B.P. 32 El Alia, Algiers 16111, Algeria;3. Aix-Marseille University, CNRS, Centrale Marseille, IRPHE, Marseille, France;1. Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, United States;2. Sandia National Laboratories, Livermore, CA 94551-0969, United States |
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| Abstract: | Size and magnetic properties of magnetic nanoparticles (MNPs) in fluids allow special remote control of fluid flow using appropriate externally applied magnetic fields, especially when submicronic mixing is critical, inter alia, for catalytic reactions, separation and drug delivery. This work explores MNPs as nanoscale devices to control mixing at microscale by submitting the system of interest to a rotating magnetic field (RMF). Magnetic nanoparticles are harnessed by RMF and converted into nanostirrers thereby generating MNP-pinned localized agitation in the liquid phase. Using this technique, self-diffusion coefficient of water in a static diffusion cell was intensified up to 200 folds. Also, axial dispersion of capillary Poiseuille flows under RMF underwent a reduction prompted by MNP-mediated intensification of lateral mixing relative to that in absence of magnetic field. Finally a multiphase flow case concerned gas–liquid mass transfer from oxygen Taylor bubbles to the liquid in capillaries where dilute MNP solutions led to measurable enhancement of kLa under RMF. |
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| Keywords: | Magnetic nanoparticle Rotating magnetic field Mixing Self-diffusion Taylor dispersion Taylor bubble |
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