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Open Access Publications from the University of California

Ionotactile Stimulation: Nonvolatile Ionic Gels for Human-Machine Interfaces.

  • Author(s): Root, Samuel E
  • Carpenter, Cody W
  • Kayser, Laure V
  • Rodriquez, Daniel
  • Davies, Daniel M
  • Wang, Shen
  • Tan, Siew Ting M
  • Meng, Ying Shirley
  • Lipomi, Darren J
  • et al.

We report the application of a nonvolatile ionic gel as a soft, conductive interface for electrotactile stimulation. Materials characterization reveals that, compared to a conventional ionic hydrogel, a glycerol-containing ionic gel does not dry out in air, has better adhesion to skin, and exhibits a similar impedance spectrum in the range of physiological frequencies. Moreover, psychophysical experiments reveal that the nonvolatile gel also exhibits a wider window of comfortable electrotactile stimulation. Finally, a simple pixelated device is fabricated to demonstrate spatial resolution of the haptic signal.

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