Nakamura Shunsuke, Yamanaka Momoka, Oishi Yushi, Narita Takayuki
Department of Chemistry and Applied Chemistry, Saga University 1 Honjo Saga 840-8502 Japan
RSC Adv. 2022 Nov 23;12(52):33612-33616. doi: 10.1039/d2ra05722k. eCollection 2022 Nov 22.
Light-driven self-oscillators without electronic circuits or conventional heat engines are carbon-emission-free systems and hold promise for developing autonomous transmission pumps and self-swimming micromotors. Thermosensitive hydrogels as self-oscillators can be used in the exploitation of low-temperature heat sources and in medical applications since the driving temperature is close to body temperature. Here, the autonomous swinging of the hydrogel was achieved by irradiating a constant light beam onto a head laminated with two thermosensitive hydrogels with different transition temperatures. Hysteresis resulting from the transition point difference between the two hydrogels allowed the light-driven self-oscillation without self-shadowing from the irradiation. The proposed theoretical model and numerical simulations explain this light-driven continuous swing, and the results agree qualitatively well with the experiments.
无需电子电路或传统热机的光驱动自振荡器是无碳排放系统，有望用于开发自主传输泵和自泳微电机。热敏水凝胶作为自振荡器，由于其驱动温度接近体温，可用于低温热源开发及医学应用。在此，通过将恒定光束照射到层叠有两种具有不同转变温度的热敏水凝胶的头部，实现了水凝胶的自主摆动。两种水凝胶转变点差异导致的滞后现象使得光驱动自振荡得以实现，且不会因照射产生自遮挡。所提出的理论模型和数值模拟解释了这种光驱动连续摆动，结果与实验在定性上吻合良好。
