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Download fileProgrammable Ultralight Magnets via Orientational Arrangement of Ferromagnetic Nanoparticles within Aerogel Hosts
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posted on 2019-12-04, 15:47 authored by Yuanyuan Li, Qingkun Liu, Andrew J. Hess, Shu Mi, Xiaoduo Liu, Ziyu Chen, Yong Xie, Ivan I. SmalyukhThe actuation and levitation of air-suspended objects
by a magnetic
field, due to its noncontact and holonomic manipulation modes, are
important technological capabilities for device applications. However,
owing to a higher density of conventional ferromagnets or nanoparticle-containing
polymers and strong magnetic fields required for actuation, fabricating
lightweight materials with a sensitive magnetic response for weight
critical applications is challenging. Here, we report ultralight aerogel-based
magnets (aero-magnets) comprising assembled ferromagnetic nanomaterials
with highly magnetic anisotropy where the magnetic domains can be
programmed by external predesigned fields. To demonstrate the breadth
of manufacturing methods for this breed of aero-magnet composites,
both silica/nanocellulose aerogel hosts and ferromagnetic nanorod/nanoplatelet
guests have been explored. Single and double domains with out-of-plane
magnetization are programmed into the aero-magnets and characterized
by magnetic force microscopy. The levitation and actuation of the
aero-magnets are realized while exposed to a small external magnetic
field of 11 mT and introduced to a switching circuit. Furthermore,
the elastic moduli of the aero-magnets are estimated by dynamic magnetic
responses of the ferromagnetic nanoparticles tightly tethered in the
aerogel hosts under rapid cyclic fields. These programmable aero-magnets
could serve as monolithic magnetic actuator units in the fields of
tiny robots and aerospace components.
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report ultralight aerogel-based magnetspredesigned fieldsaero-magnet compositesair-suspended objects11 mTholonomic manipulation modesaerospace componentsFerromagnetic Nanoparticlesout-of-plane magnetizationmanufacturing methodsOrientational Arrangementactuationactuator unitscyclic fieldsnanoparticle-containing polymersdevice applicationsAerogel Hostsforce microscopyProgrammable Ultralight Magnetsaerogel hosts