On demand manipulation of ferrofluid droplets by magnetic fields
Varma, Vijaykumar Babulalji
Jayaneel, P. J.
Sudharsan, N. M.
Wang, Z. P.
Ramanujan, Raju V.
Date of Issue2016
School of Materials Science and Engineering
Magnetic droplets, consisting of magnetic nanoparticles in a carrier fluid, are of high interest due to applications such as remote and wireless control in a microfluidic environment. We investigated the influence of magnetic field on the control of ferrofluid droplet size in a nonmagnetic carrier fluid. Generation of larger droplets by a re-pumping mechanism was studied. The magnetic field leads to coalescence and mixing of the magnetic droplets. A significant response of the ferrofluid droplets to changes in flow rate ratio, the viscosity of the carrier medium and magnetic field intensity was observed. The droplet size can be increased by three times of its initial diameter by tuning the magnetic field intensity. Our modeling results show a similar trend to the experimental findings. Such control, mixing, and re-pumping of droplets is relevant to novel Lab-on-a-Chip applications.
Sensors and Actuators B: Chemical
© 2016 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Sensors and Actuators, B: Chemical, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.snb.2016.11.115].