Two-wavelength infrared responsive soft actuators composed of rare-earth-oxide particles composited in a thermoresponsive hydrogel have been constructed. Because Nd2O3 and Yb2O3 particles possess independent narrow infrared adsorption at 808 and 980 nm, respectively, the vicinity of the particles in the gel can be individually heated by irradiation at each adsorption wavelength, inducing a local volume phase transition. The wavelength-selective volume phase transition can be controlled based on the combination of the particles incorporated in the gels and the wavelength of the irradiation laser at the optimized water temperature. Only the alternatively correct combinations successfully induced selective local clouding at the irradiation spots in the gel sheets. The original transparency of the gel was immediately recovered by turning off the light. Furthermore, rod-shaped block gels with Nd2O3 and Yb2O3 particles separately arranged on the left and right sides at the bottom of the rods were prepared to demonstrate wavelength-selective bending motion. The correct light combination caused reversible bending motion of only the side of the rod gel with the corresponding adsorbed particles.
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机译:已经构造了由在热响应性水凝胶中复合的稀土氧化物颗粒组成的两波长红外响应软致动器。由于Nd2O3和Yb2O3颗粒分别在808和980nm处具有独立的窄红外吸附,因此可以通过在每个吸附波长处照射来分别加热凝胶中颗粒的附近,从而引起局部体积相变。可以基于结合在凝胶中的颗粒和在最佳水温下的照射激光的波长的组合来控制波长选择性体积相变。只有交替正确的组合才能成功地在凝胶片上的辐照点处引起选择性的局部混浊。通过关闭灯,可立即恢复凝胶的原始透明度。此外,制备了具有Nd 2 O 3和Yb 2 O 3颗粒分别布置在杆底部的左侧和右侧的杆状块状凝胶,以显示波长选择性弯曲运动。正确的光组合仅会使棒状凝胶与相应吸附颗粒的侧面发生可逆的弯曲运动。
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