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Bioinspired conductive cellulose liquid-crystal hydrogels as multifunctional electrical skins

Zhang, Zhuohao ; Chen, Zhuoyue ; Wang, Yu ; Zhao, Yuanjin

Proceedings of the National Academy of Sciences - PNAS, 2020-08, Vol.117 (31), p.18310-18316 [Periódico revisado por pares]

United States: National Academy of Sciences

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Título:
Bioinspired conductive cellulose liquid-crystal hydrogels as multifunctional electrical skins
Autor: Zhang, Zhuohao ; Chen, Zhuoyue ; Wang, Yu ; Zhao, Yuanjin
Assuntos: Acrylamide ; Acrylic acid ; Bionics ; Carbon nanotubes ; Cellulose ; Cellulose - chemistry ; Cholesteric liquid crystals ; Color ; Crystal structure ; Electric Conductivity ; Electrical resistance ; Electrical resistivity ; External stimuli ; Hydrogels ; Hydrogels - chemistry ; Hydroxypropyl cellulose ; Liquid Crystals ; Mapping ; Mechanical stimuli ; Nanotechnology ; Nanotubes ; Optical Phenomena ; Periodic structures ; Photonic crystals ; Physical Sciences ; Prostheses ; Prosthetics ; Saturation (color) ; Skin ; Stimuli ; Switches ; Wearable Electronic Devices ; Wearable technology
É parte de: Proceedings of the National Academy of Sciences - PNAS, 2020-08, Vol.117 (31), p.18310-18316
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
Edited by David A. Weitz, Harvard University, Cambridge, MA, and approved June 22, 2020 (received for review April 13, 2020)
Author contributions: Y.Z. designed research; Z.Z., Z.C., and Y.W. performed research; Z.Z. analyzed data; Z.C. and Y.W. contributed to scientific discussion of the article; and Z.Z. and Y.Z. wrote the paper.
Descrição: Bionic electronic skin (E-skin) that could convert external physical or mechanical stimuli into output signals has a wide range of applications including wearable devices, artificial prostheses, software robots, etc. Here, we present a chameleon-inspired multifunctional E-skin based on hydroxypropyl cellulose (HPC), Poly(Acrylamide--co-Acrylic acid) (PACA), and carbon nanotubes (CNTs) composited liquid-crystal hydrogel. We found that the HPC could still form cholesteric liquid-crystal photonic structures with the CNTs additive for enhancing their color saturation and PACA polymerization for locating their assembled periodic structures. As the composite hydrogel containing HPC elements and the PACA scaffold responds to different stimuli, such as temperature variations, mechanical pressure, and tension, it could correspondingly change its volume or internal nanostructure and report these as visible color switches. In addition, due to the additive of CNTs, the composite hydrogel could also output these stimuli as electrical resistance signals. Thus, the hydrogel E-skins had the ability of quantitatively feeding back external stimuli through electrical resistance as well as visually mapping the stimulating sites by color variation. This dual-signal sensing provides the ability of visible-user interaction as well as antiinterference, endowing the multifunctional E-skin with great application prospects.
Editor: United States: National Academy of Sciences
Idioma: Inglês

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Bioinspired conductive cellulose liquid-crystal hydrogels as multifunctional electrical skins

Zhang, Zhuohao ; Chen, Zhuoyue ; Wang, Yu ; Zhao, Yuanjin

United States: National Academy of Sciences

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