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. 2022 Jan 7;8:705662. doi: 10.3389/frobt.2021.705662

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Copyright © 2022 Othman, Lai, Abril, Barajas-Gamboa, Corcelles, Kroh and Qasaimeh.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Microfluidic tactile sensing based on electrical resistance change. (A) Exploded view of the flexible microfluidic pressure sensor and normalized electrical resistance profile of the pressure sensor subjected to bending, twisting, and crushing during characterization (Yeo et al., 2016b). Published by The Royal Society of Chemistry (RSC). (B) Schematic of the 3D‐printed rigid microbump‐integrated liquid metal‐based pressure sensor showing the effect of the microbump on pressure sensitivity and the sensing response to the application of varying pressure levels (Kim et al., 2019). Copyright (2019) WILEY-VCH. (C) Optical image and schematics of a microfluidic tactile diaphragm pressure sensor with liquid metal Wheatstone bridge circuit. (D) Real-time response recorded from the corresponding thumb and index finger sensors while grasping a grape (Gao et al., 2017). Copyright (2017) WILEY-VCH.