Active surfaces: Ferrofluid-impregnated surfaces for active manipulation of droplets
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Varanasi_Active surfaces.pdf
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Author(s)
Khalil, Karim Samir
Mahmoudi, Seyed Reza
Abu-dheir, Numan
Varanasi, Kripa
Date Issued
July 2014
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Khalil, Karim S., Seyed Reza Mahmoudi, Numan Abu-dheir, and Kripa K. Varanasi. "Active surfaces: Ferrofluid-impregnated surfaces for active manipulation of droplets." Applied Physics Letters 105, 041604 (2014) p.1-4. © 2014 AIP Publishing.
Version
Final published version
Abstract
Droplet manipulation and mobility on non-wetting surfaces is of practical importance for diverse applications ranging from micro-fluidic devices, anti-icing, dropwise condensation, and biomedical devices. The use of active external fields has been explored via electric, acoustic, and vibrational, yet moving highly conductive and viscous fluids remains a challenge. Magnetic fields have been used for droplet manipulation; however, usually, the fluid is functionalized to be magnetic, and requires enormous fields of superconducting magnets when transitioning to diamagnetic materials such as water. Here we present a class of active surfaces by stably impregnating active fluids such as ferrofluids into a textured surface. Droplets on such ferrofluid-impregnated surfaces have extremely low hysteresis and high mobility such that they can be propelled by applying relatively low magnetic fields. Our surface is able to manipulate a variety of materials including diamagnetic, conductive and highly viscous fluids, and additionally solid particles.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1063/1.4891439
