Poly(2-oxazoline)-based magnetic hydrogels: Synthesis, performance and cytotoxicity

Cvek, Martin; Zahoranová, Anna; Mrlík, Miroslav; Šrámková, Petra; Minařík, Antonín; Sedlačík, Michal

doi:10.1016/j.colsurfb.2020.110912

Cited by 28 publications

(24 citation statements)

References 46 publications

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“…Experiments [ 53 , 54 , 55 , 56 ] demonstrate that in magnetic suspensions as well as in ferrogels, based on the solution of biological polymers, cured without an external magnetic field, particles of a magnetic filler form isotropic primary agglomerates and other heterogeneous structures. The appearance of these structures leads to strong dependence of the suspensions and ferrogels’ rheological properties on an applied magnetic field and volume concentration of the particles.…”

Section: Theoretical Model Of the Mr-effect Internal Mechanismmentioning

confidence: 99%

Magnetorheological Effect of Magnetoactive Elastomer with a Permalloy Filler

et al. 2020

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Within the frames of this study, the synthesis of a permalloy to be used as a filler for magnetoactive and magnetorheological elastomers (MAEs and MREs) was carried out. By means of the mechanochemical method, an alloy with the composition 75 wt.% of Fe and 25 wt.% of Ni was obtained. The powder of the product was utilized in the synthesis of MAEs. Study of the magnetorheological (MR) properties of the elastomer showed that in a ~400 mT magnetic field the shear modulus of the MAE increased by a factor of ~200, exhibiting an absolute value of ~8 MPa. Furthermore, we obtained experimentally a relative high loss factor for the studied composite; this relates to the size and morphology of the synthesized powder. The composite with such properties is a very perspective material for magnetocontrollable damping devices. Under the action of an external magnetic field, chain-like structures are formed inside the elastomeric matrix, which is the main determining factor for obtaining a high MR effect. The effect of chain-like structures formation is most pronounced in the region of small strains, since structures are partially destroyed at large strains. A proposed theoretical model based on chain formation sufficiently well describes the experimentally observed MR effect. The peculiarity of the model is that chains of aggregates of particles, instead of individual particles, are considered.

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Section: Theoretical Model Of the Mr-effect Internal Mechanismmentioning

confidence: 99%

Magnetorheological Effect of Magnetoactive Elastomer with a Permalloy Filler

et al. 2020

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“…Similar insignificant effects of magnetic particles on the swelling ability of poly(2-oxazoline)-based magnetic hydrogels were also observed. 55 However, the mechanism of Lap magnetization on the swelling of magnetic hydrogels is not completely clear. It can be speculated that the observed effects can reflect the significant effects of Lap magnetisation on the structure and porosity of hydrogels.…”

Section: Resultsmentioning

confidence: 99%

Temperature sensitive hydrogels cross-linked by magnetic LAPONITE® RD®: effects of particle magnetization

et al. 2020

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“…[ 68,69 ] Thus, MR elastomer research is naturally connected to the development of magnetically controlled soft actuators for soft robotics. As of 2020, MR elastomers and gels are actively researched to enable unprecedented material properties such as lower off‐state viscosity, [ 70,71 ] 3D printability, [ 72 ] off‐axis anisotropicity for directional actuation, [ 73 ] surface‐modified magnetic particles for better dispersion, [ 74 ] novel polymer matrix for lower cytotoxicity, [ 75 ] and fiber reinforcement of MR elastomers to strengthen the matrix and guide the field‐induced alignment of magnetic particles. [ 76 ] Recently demonstrated applications that harness the dimensional modulation of MR gels and elastomers include precisely controllable peristaltic pumps, [ 77 ] enhanced contrast for tactile displays, [ 78 ] and grippers for transporting objects.…”

Section: Materials: Classification and Fabricationmentioning

confidence: 99%

Magnetically Controlled Soft Robotics Utilizing Elastomers and Gels in Actuation: A Review

Chung

Parsons

Zheng

2020

Advanced Intelligent Systems

103

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A magnetic field has unique advantages in controlling soft robotics inside of an enclosed space, such as surgical catheters or untethered drug‐delivering robots operating in the human body. Soft actuators, made of elastomers and gels functionalized with magnetically active materials, are natural choices to drive magnetically controlled motions of soft robots. Recent innovations in soft material technologies, including 3D printing, origami/kirigami, tough hydrogels, mechanical metamaterials, and liquid metal‐injected elastomers, offer technological foundations to develop soft actuators and robots with significantly enhanced performance. Herein, an overview of magnetic soft actuators and robots from a materials engineer's perspective is provided. First, the historical background and recent trends of magnetic soft actuators are discussed. Second, the motions of tethered or untethered magnetic soft robotics are classified into aquatic swimmers, terrestrial locomotors, and grippers. Herein, preprogrammed motion under patterned magnetic stimuli is achieved by controlled magnetization of elastomeric materials containing hard magnetic particles. Finally, the applications of magnetically controlled soft robotics in surgical and therapeutic medical devices are discussed.

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Poly(2-oxazoline)-based magnetic hydrogels: Synthesis, performance and cytotoxicity

Cited by 28 publications

References 46 publications

Magnetorheological Effect of Magnetoactive Elastomer with a Permalloy Filler

Magnetorheological Effect of Magnetoactive Elastomer with a Permalloy Filler

Temperature sensitive hydrogels cross-linked by magnetic LAPONITE® RD®: effects of particle magnetization

Magnetically Controlled Soft Robotics Utilizing Elastomers and Gels in Actuation: A Review

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