Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 24, Pages 28878-28888Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c06422
Keywords
ionic liquids; thermochromic; polyurethane; shape memory; actuators
Funding
- National Natural Science Foundation of China [21835005, U1862109]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Bioinspired synergistic shape-color-switchable actuators based on thermally induced shape-memory polyurethane and thermochromic ionic liquids were prepared in this study. These actuators can quickly change color and shape in a narrow temperature range, showing potential applications in artificial muscle actuators and intelligent camouflages.
Many creatures have excellent control over their form, color, and morphology, allowing them to respond to the interaction of environmental stimuli better. Here, the bioinspired synergistic shape-color-switchable actuators based on thermally induced shape-memory triethanolamine cross-linked polyurethane (TEAPU) and thermochromic ionic liquids (ILs) were prepared. The thermochromic ILs with various metalized anions, including bis(1-butyl-3-methylimidazolium) tetrachloro nickelate ([Bmim](2)[NiCl4]) and bis(1-butyl-3-methylimidazolium) tetrachloride cobalt ([Bmim](2)[CoCl4]), are investigated. The actuators exhibit thermochromic response, as evidenced by a shift in the color of the composites, which is due to the formation of the tetrahedral complex MCl42- (M = Ni and Co) after dehydration. The shape-color-switchable thermochromic actuators have strong molecular interaction between TEAPU and ILs and can mimic natural flowers and change the color and shape quickly in a narrow temperature range (30-70 degrees C). In addition, these thermochromic actuators can lift more than 50 times their weight and withstand strains of more than 1100%. The results represent the potential application in artificial muscle actuators and intelligent camouflages.
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