期刊
SCIENCE
卷 376, 期 6592, 页码 502-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaw1974
关键词
-
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Collaborative Research and Development Grant
- Institute of Advanced Studies at CY Cergy Paris Universite through the Visiting Scholar program
The human somatosensory network relies on ionic currents to sense, transmit, and process tactile information. Researchers have discovered hydrogels that can transduce pressure into ionic currents, forming a piezoionic skin. These currents can directly modulate neurons and excite muscles, presenting a potential path towards bionic sensory interfaces.
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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