طراحي و توسعه محرك‌هاي نانوليفي هوشمند مبتني بر پليمرهاي رسانا و نانوصفحات مكسين براي كاربردهاي پوشيدني

The development of multifunctional soft actuators capable of responding to environmental stimuli plays a significant role in advancing soft robotics an‎d smart wearable systems. In this research, the design an‎d development of nanofibrous actuators based on conductive polymers an‎d MXene nanosheets were investigated, aiming to achieve electrochemical an‎d humidity responses. For this purpose, two nanofibrous substrates, including highly flexible polyurethane an‎d low-diameter polyamide 6 resulting in higher specific surface area, were first fabricated by the electrospinning technique. Then, polypyrrole as an electroactive conductive polymer was coated onto fabricated substrates via in-situ chemical polymerization at different times. The humidity-responsive capability was also investigated by coating MXene nanosheets onto the nanofibrous surface. Finally, a hybrid actuator with dual responsiveness was fabricated by pyrrole polymerization on the MXene-coated substrate. The morphology, elemental analysis, electrical properties, tensile characteristics, an‎d performance of the produced actuators were investigated. Uniaxial tensile tests confirmed the superior flexibility of the polyurethane substrate compared to polyamide 6 substrate demonstrated more desirable performance in terms of electrochemical actuation an‎d was thus determined as the selec‎ted structure. The polyamide 6/polypyrrole nanofibrous actuator produced with a 3-hour polymerization time exhibited the highest electrochemical actuation, showing a bending displacement of up to 869 degrees with average angular velocity about 1.5 degree/s. Furthermore, to induce a moisture response, MXene nanosheets at a specific concentration were coated onto the polyamide 6 substrate via the dipping method, which led to a significant bending deformation of 246 degrees due to changes in relative humidity. The results clearly demonstrate the superiority of the structural role of the substrate with a higher specific surface area over its flexibility in the final performance of the actuator. The results of the actuating tests indicated a charge-dependent bendig behavior during electrochemical actuation an‎d a stable, repeatable response in humidity cycles. Therefore, the results of this study indicate that engineering the nanofibrous structure an‎d using the polypyrrole conductive polymer along with MXene nanosheets can provide an effective pathway for developing lightweight, flexible, an‎d multifunctional actuators with potential applications in smart textiles, wearable devices, an‎d soft robotic systems.

وحيد عبادي

داريوش سمناني , محسن شنبه