Rapidly Reversibly Organic Crystalline Switch for Conversion of Heat into Mechanical Energy [post]

Madushani Dharmarwardana, Srimanta Pakhira, Raymond P. Welch, Carlos Caicedo Narvaez, Michael A. Luzuriaga, Bhargav S. Arimilli, Gregory T. McCandless, Babak Fahimi, Jose Mendoza-Cortes, Jeremiah J. Gassensmith
2020 unpublished
<div> <div> <div> <p>Solid state thermosalience—a sudden exertion of an expansive or contractive physical force following a temperature change in a solid state compound—is rare, few are reversible systems, and most of these are limited to a dozen or so cycles before the crystal degrades or they reverse slowly over the course of many minutes or even hours. In this work, we show a fully reversible actuator that is stable at room temperature for multiple years and is capable of actuation for more
more » ... actuation for more than two hundred cycles at near ambient temperature. Specifically, the crystals shrink to 90% of its original length instantaneously upon heating beyond 45 °C and expands back to its original length upon cooling below 35 °C. This temperature regime is important because it occurs around physiologically important temperatures. Furthermore, the phase transition occurs instantaneously, with little obvious hysteresis, allowing us to create real-time actuating thermal fuses that cycle between on and off rapidly. </p> </div> </div> </div>
doi:10.26434/chemrxiv.12657230 fatcat:k5fjxvigdjgrhfaio6r7mhmsdm