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Download fileAdhesive Tough Magnetic Hydrogels with High Fe3O4 Content
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posted on 2019-02-18, 00:00 authored by Xiaocheng Hu, Guodong Nian, Xueya Liang, Lei Wu, Tenghao Yin, Haotian Lu, Shaoxing Qu, Wei YangMagnetic hydrogels
have promising applications in flexible electronics,
biomedical devices, and soft robotics. However, most existing magnetic
hydrogels are fragile and suffer insufficient magnetic response. In
this paper, we present a new approach to fabricate a strong, tough,
and adhesive magnetic hydrogel with nontoxic polyacrylamide (PAAm)
hydrogel as the matrix and the functional additive [3-(trimethoxysilyl)propyl
methacrylate coated Fe3O4] as the inclusions.
This magnetic hydrogel not only offers a relatively high modulus and
toughness compared to the pure hydrogel but also responds to the magnetic
field rapidly because of high magnetic particle content (up to 60%,
with respect to the total weight of the polymers and water). The hydrogel
can be bonded to hydroxyl-rich hard and soft surfaces. Magnetic hydrogel
with polydimethylsiloxane (PDMS) coating exhibits excellent underwater
performance. The bonding between magnetic hydrogel and PDMS is very
stable even under cyclic loading. An artificial muscle and its magnetomechanical
coupling performance are demonstrated using this hydrogel. The adhesive
tough magnetic hydrogel will open up extensive applications in many
fields, such as controlled drug delivery systems, coating of soft
devices, and microfluidics. The strategy is applicable to other functional
soft materials.