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This study models artificial muscle tissue actuators using pH-responsive polymers. The research demonstrates significant volume changes and work output, with tunable actuation via salt concentration for biocompatibility.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Artificial muscle actuators are crucial for soft robotics and biomedical devices.
  • pH-responsive polyelectrolytes offer potential for controlled actuation.
  • Previous models lacked specific inclusion of pH-triggered expansion mechanisms.

Purpose of the Study:

  • To theoretically describe actuators in prototype artificial muscle tissue.
  • To investigate the impact of pH variations on polyelectrolyte-based actuators.
  • To explore tuning actuation properties using salt concentration.

Main Methods:

  • A self-consistent (mean field) lattice computational scheme was employed.
  • The model incorporates pH-responsive polyelectrolytes grafted between colloidal particles.
  • Weakly acidic monomers were included to simulate pH-triggered expansion.

Main Results:

  • Actuators composed of strong polyelectrolytes generate pressure differences of tens of MPa.
  • The system exhibits volume changes of approximately one-third of the polymer contour length.
  • Work output of about 100kT per polymer chain was achieved.
  • Salt concentration effectively tunes the actuation pH range for weakly charged polyelectrolytes.

Conclusions:

  • The theoretical model successfully describes pH-responsive artificial muscle actuators.
  • Significant actuation pressures and volume variations are achievable.
  • Salt concentration offers a viable method for tuning actuation to biocompatible pH ranges.