Piezoresistive Geopolymer Enabled by Crack-Surface Coating
The conductive polymer was introduced to crack surfaces in geopolymers to enable piezo-resistivity. In combination with crack morphology characterization and the piezo-resistive test, the functionalized geopolymer was found to achieve a high sensitivity (with ΔR/R0/Δ∈ equals to 376.9 for loading and 513.3 for unloading) to both small external stress (less than 2 MPa) and wide range of strains (up to 1700 µ∈). This piezo-resistive behavior can be well described by a coupled mechanical-conductive contact mechanism. A new way to enable the self-sensing function of materials utilizing their existing micro-features was successfully proposed and validated.
S. Chen et al., "Piezoresistive Geopolymer Enabled by Crack-Surface Coating," Materials Letters, vol. 255, Elsevier B.V., Nov 2019.
The definitive version is available at https://doi.org/10.1016/j.matlet.2019.126582
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Conductive polymer; Contact mechanics; Geopolymer; Piezo-resistance; Self-sensing
International Standard Serial Number (ISSN)
Article - Journal
© 2019 Elsevier B.V., All rights reserved.
01 Nov 2019