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Title: A double-layer mechanochromic hydrogel with multidirectional force sensing and encryption capability
Authors: Zhu, Qingdi
Van Vliet, Krystyn
Holten-Andersen, Niels
Miserez, Ali
Keywords: Engineering::Materials
Issue Date: 2019
Source: Zhu, Q., Van Vliet, K., Holten-Andersen, N. & Miserez, A. (2019). A double-layer mechanochromic hydrogel with multidirectional force sensing and encryption capability. Advanced Functional Materials, 29(14), 1808191-.
Journal: Advanced Functional Materials
Abstract: Hydrogel-based soft mechanochromic materials that display colorimetric changes upon mechanical stimuli have attracted wide interest in sensors and display device applications. A common strategy to produce mechanochromic hydrogels is through photonic structures, in which mechanochromism is obtained by strain-dependent diffraction of light. Here, a distinct concept and simple fabrication strategy is presented to produce luminescent mechanochromic hydrogels based on a double-layer design. The two layers contain different luminescent species—carbon dots and lanthanide ions—with overlapped excitation spectra and distinct emission spectra. The mechanochromism is rendered by strain-dependent transmittance of the top-layer, which regulates light emission from the bottom-layer to control the overall hydrogel luminescence. An analytical model is developed to predict the initial luminescence color and color changes as a function of uniaxial strain. Finally, this study demonstrates proof-of-concept applications of the mechanochromic hydrogel for pressure and contact force sensors as well as for encryption devices.
ISSN: 1616-301X
DOI: 10.1002/adfm.201808191
Rights: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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