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Researchers developed a novel electro-ionic soft actuator using metal-free covalent triazine frameworks (CTFs) for bioinspired soft robotics. This actuator achieves high bending displacement under ultralow voltages, enabling precise touch applications on fragile displays.

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Area of Science:

  • Bioinspired soft robotics
  • Materials science
  • Actuator technology

Background:

  • Existing electroactive artificial muscles for soft robotics often lack sufficient bending displacement and exhibit irregular responses at low input voltages.
  • Developing actuators that mimic human finger dexterity for sophisticated tasks remains a challenge.

Purpose of the Study:

  • To develop a high-performance electro-ionic soft actuator capable of high bending deformation under ultralow input voltages.
  • To implement this actuator as a soft robotic touch finger for delicate applications, such as on fragile displays.

Main Methods:

  • Synthesized metal-free covalent triazine frameworks (CTFs) derived from polymers of intrinsic microporosity (PIM-1).
  • Combined CTFs with poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) to create a flexible electrode.
  • Fabricated and tested an electro-ionic soft actuator using the CTF-based electrode.

Main Results:

  • The soft touch finger actuator demonstrated a high peak-to-peak displacement of 17.0 mm under an ultralow square voltage of ±0.5 V at 0.1 Hz.
  • Achieved a 4-times reduced phase delay in harmonic response compared to pure PEDOT-PSS actuators.
  • The enhanced performance is attributed to the highly porous and electrically conjugated network of the CTFs electrode.

Conclusions:

  • The CTF-based electro-ionic soft actuator offers superior performance for low-voltage actuation.
  • The developed soft robotic touch finger successfully performed delicate touching tasks on fragile displays and precise operations like playing an electronic piano.