Magnetically Addressable Shape-Memory and Stiffening in a Composite Elastomer
Paolo Testa,Paolo Testa,Robert W. Style,Jizhai Cui,Jizhai Cui,Claire Donnelly,Claire Donnelly,Elena Borisova,Peter M. Derlet,Eric R. Dufresne,Laura J. Heyderman,Laura J. Heyderman +11 more
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TLDR
This work presents a soft magnetic shape-memory composite produced by encasing liquid droplets of magneto-rheological fluid into a poly(dimethylsiloxane) matrix, which undergoes an exceptional stiffening transition, with an almost 30-fold increase in shear modulus.Abstract:
With a specific stimulus, shape-memory materials can assume a temporary shape and subsequently recover their original shape, a functionality that renders them relevant for applications in fields such as biomedicine, aerospace, and wearable electronics. Shape-memory in polymers and composites is usually achieved by exploiting a thermal transition to program a temporary shape and subsequently recover the original shape. This may be problematic for heat-sensitive environments, and when rapid and uniform heating is required. In this work, a soft magnetic shape-memory composite is produced by encasing liquid droplets of magneto-rheological fluid into a poly(dimethylsiloxane) matrix. Under the influence of a magnetic field, this material undergoes an exceptional stiffening transition, with an almost 30-fold increase in shear modulus. Exploiting this transition, fast and fully reversible magnetic shape-memory is demonstrated in three ways, by embossing, by simple shear, and by unconstrained 3D deformation. Using advanced synchrotron X-ray tomography techniques, the internal structure of the material is revealed, which can be correlated with the composite stiffening and shape-memory mechanism. This material concept, based on a simple emulsion process, can be extended to different fluids and elastomers, and can be manufactured with a wide range of methods.read more
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A Review of Shape Memory Polymers and Composites: Mechanisms, Materials, and Applications
TL;DR: A comprehensive analysis of the shape recovery mechanisms, multifunctionality, applications, and recent advances in SMPs and SMPCs is presented.
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A review on magneto-mechanical characterizations of magnetorheological elastomers
Anil K. Bastola,Mokarram Hossain +1 more
TL;DR: Magnetorheological elastomers (MREs) are a class of recently emerged smart materials whose moduli are largely influenced when exposed to an external magnetic field as mentioned in this paper.
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Magnetic Soft Materials and Robots.
Yoonho Mark Kim,Xuanhe Zhao +1 more
TL;DR: In this paper , the authors discuss recent progress in the design and fabrication, modeling and simulation, and actuation and control of magnetic soft materials and robots, and give a set of design guidelines for optimal actuation performance.
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Ferromagnetic Liquid Metal Putty-Like Material with Transformed Shape and Reconfigurable Polarity.
TL;DR: A novel reconfigurable ferromagnetic liquid metal (LM) plasticine (FM-LMP) with high electrical conductivity and transformed shape, which is prepared through homogenously mixing neodymium-iron-boron microparticles into the gallium-based LM matrix, is reported to achieve this.
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Magneto‐/ electro‐responsive polymers toward manufacturing, characterization, and biomedical/ soft robotic applications
Ebrahim Yarali,Mahdi Baniasadi,Ali Zolfagharian,Maede Chavoshi,Fatemeh Arefi,Mokarram Hossain,Anil K. Bastola,M. H. Sheikh Ansari,Alireza Foyouzat,Ali Dabbagh,Mohamad Mehdi Ebrahimi,Mohammad J. Mirzaali,Mahdi Bodaghi +12 more
TL;DR: Magneto-/ electro-responsive polymers (MERPs) as discussed by the authors are a class of stimuli-responsive materials that are actuated when triggered by external magnetic/electric fields.
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Doctoral Thesis by
TL;DR: In this thesis, the existence and uniqueness of gradient trajectories near an A2singularity are analysed and it is proved that the two Lagrangian vanishing cycles associated to these critical points intersect transversally in exactly one point in all regular fibres along a straight line.