Cooling-responsive shape memory hybridCooling-/water-responsive shape memory hybrids,
Composites Science and Technology (2012) |
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Cooling-responsive hydrogel冷却驱动形状记忆水凝胶 |
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3D printing in solid stateProof-of-concept by Chen YH
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Rapid Volumatic additive manufacturing of cooling-responsive shape memory hydrogel via dual-mask cross-linking in solid state
Preliminary experimental result by Faqrul Hasif Bin Abdul Nasir (FYP) |
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S-shaped sample and its cooling-responsive SME
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Degradation by/in water
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Kept dry for 2 years
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Kept wet for 2 years
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Kept dry for 7 months
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Heating/cooling-responsive shape memory hybrid |
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Ref. Stimulus-responsive shape memory materials: a review, Materials and Design, 2012
Fabrication of cooling-responsive shape memory hydrogels via FDM(FYP) MUHAMMAD RIDHUAN BIN MOHAMED HAIRI
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Melting upon cooling |
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Cold-induced shape memory hydrogels for strong and programmable artificial muscles
基于冷致形状记忆水凝胶的超强可编程人工肌肉
该材料由聚丙烯酸水凝胶和醋酸钙络合而成，在常温下处于柔软状态可以被编辑形状，加热至70 °C时通过相分离产生玻璃态微区而发生硬化，这一性质被用于固定临时形状。再次将此材料置于低温状态，材料发生软化从而回复初始形状.
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Thermo-responsive shape memory hydrogels generally achieve shape fixation at low temperatures, and shape recovery at high temperatures. However, these hydrogels usually suffer from poor mechanical properties. Herein, we present a unique poly(acrylic acid)/calcium acetate shape memory hydrogel with cold-induced shape recovery performances as ultrastrong artificial muscles. Since the acetate groups could form aggregate at high temperatures and thus induce the association of the hydrogel network, the hydrogel can be fixed into a temporary shape upon heating and recover to its original shape in a cold environment. Moreover, a programmable shape recovery process is realized by adjusting the shape fixing time. In addition, the unique shape memory process enables the application demonstration as bio-inspired artificial muscles with an ultrahigh work density of 45.2 kJ m−3, higher than that of biological muscles (~8 kJ m−3).
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Cooling-induced shape memory effect and inverse temperature dependence of superelastic stress in Co2Cr(Ga,Si) ferromagnetic Heusler alloys, Appl. Phys. Lett. 103, 164104 (2013)
