Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G25: Liquid Crystals III
11:30 AM–2:30 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-187A
Sponsoring Unit: DSOFT
Chair: Tim Atherton, Tufts
Abstract: G25.00015 : Amphibious Transport of Fluids and Solids by Soft Magnetic Carpets*
2:18 PM–2:30 PM
Ahmet F Demiroers
Ahmet F Demiroers
Joost de Graaf
Arnold J Mathijssen
(University of Pennsylvania)
One of the major challenges in modern robotics is controlling micromanipulation by active and adaptive materials. In the respiratory system, such actuation enables pathogen clearance by means of motile cilia. While various types of artificial cilia have been engineered recently, they often involve complex manufacturing protocols and focus on transporting liquids only. Here, we create soft magnetic carpets via an easy self-assembly route based on the Rosensweig instability. These carpets can transport liquids but also solid objects that are larger and heavier than the artificial cilia, using a crowd-surfing effect. This amphibious transportation is locally and reconfigurably tuneable by simple micromagnets or advanced programmable magnetic fields with a high degree of spatial resolution1.
We identify and model two surprising cargo reversal effects due to collective ciliary motion and non-trivial elastohydrodynamics. While our active carpets are generally applicable to integrated control systems for transport, mixing, and sorting, these effects could also be exploited for microfluidic viscosimetry and elastometry.
*Swiss National Science Foundation: 51NF40_182881Nederlandse Organisatie voor Wetenschappelijk Onderzoek 740.018.013Horizon 2020, EU‐FET project NANOPHLOW 766972United States Department of Agriculture 2020‐67017‐30776 2020‐67015‐32330
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