This work investigates the mechanical-electrical coupling behavior of self-sensing magnetism-responsive anisotropic films (SMAF) under dynamic loading conditions, demonstrating their ability to serve as integrated sensors and actuators. The SMAF structure, composed of a poly(dimethylsiloxane) (PDMS) matrix embedded with oriented carbonyl iron particles (CIPs) and a patterned silver nanowire (AgNW) sensing layer, exhibits highly responsive electrical characteristics when subjected to mechanical deformation. A custom measurement system was designed to apply controlled deflections via a reciprocating drive, with real-time data acquisition using a Modulab MTS system and software-based analysis. When the drive rod loaded from direction I, the SMAF sample bent toward the grating side, resulting in a negative normalized resistance change (ΔR/R).959122-11-3 Synonym This decrease in resistance correlates directly with increasing deflection, reaching up to -4.5% at 1.5 mm deflection, indicating that compression of the AgNW network enhances conductivity.
The response is stable and reproducible across multiple cycles. Under cyclic loading at 1.5 mm amplitude, the resistance returned to baseline after each cycle, confirming excellent recoverability and durability. Furthermore, testing across frequencies from 0.1 Hz to 1.0 Hz revealed no significant influence on the magnitude or shape of the resistance variation, suggesting that the sensing mechanism is primarily strain-driven rather than rate-dependent. When the load was applied from direction II—opposite to the initial bending—the resistance change became positive, due to the asymmetric thickness of the AgNW layer on either side of the film. This directional sensitivity enables clear differentiation between bending modes, allowing the system to distinguish inward versus outward deformation based solely on the sign of the electrical signal.
Time-resolved monitoring showed consistent performance during repeated loading-unloading cycles, with minimal hysteresis and no degradation over time. The system maintained high fidelity even under variable loading speeds, confirming robustness for practical applications. Additionally, the films demonstrated rapid response times: the electrical signal rose within ~60 ms and reset within ~80 ms following field removal, aligning closely with the mechanical actuation dynamics.30516-87-1 Description This fast response ensures real-time feedback capability, essential for closed-loop control in soft robotic systems.PMID:29261956
These results highlight the dual functionality of SMAF: it not only acts as a controllable actuator but also functions as a self-sensing unit capable of detecting deformation type, magnitude, and direction. Such intrinsic sensing eliminates the need for external sensors, simplifying device integration. The ability to monitor actuation status in real time opens new possibilities for autonomous soft robots that can adapt their motion based on environmental feedback. By combining structural programmability with electrical responsiveness, these films represent a major advancement in intelligent materials, paving the way for next-generation smart actuators that are both adaptive and self-aware.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com