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|Title:||A double-layer mechanochromic hydrogel with multidirectional force sensing and encryption capability||Authors:||Zhu, Qingdi
Van Vliet, Krystyn
|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-. https://dx.doi.org/10.1002/adfm.201808191||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.||URI:||https://hdl.handle.net/10356/150195||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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