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Dobashi, Yuta; Yao, Dickson; Petel, Yael; Nguyen, Tan Ngoc; Sarwar, Mirza Saquib; Thabet, Yacine; Ng, Cliff L W; Scabeni Glitz, Ettore; Nguyen, Giao Tran Minh; Plesse, Cédric; Vidal, Frédéric; Michal, Carl A; Madden, John D W
Science (American Association for the Advancement of Science), 04/2022, Letnik: 376, Številka: 6592Journal Article
The human somatosensory network relies on ionic currents to sense, transmit, and process tactile information. We investigate hydrogels that similarly transduce pressure into ionic currents, forming a piezoionic skin. As in rapid- and slow-adapting mechanoreceptors, piezoionic currents can vary widely in duration, from milliseconds to hundreds of seconds. These currents are shown to elicit direct neuromodulation and muscle excitation, suggesting a path toward bionic sensory interfaces. The signal magnitude and duration depend on cationic and anionic mobility differences. Patterned hydrogel films with gradients of fixed charge provide voltage offsets akin to cell potentials. The combined effects enable the creation of self-powered and ultrasoft piezoionic mechanoreceptors that generate a charge density four to six orders of magnitude higher than those of triboelectric and piezoelectric devices.
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in: SICRIS
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