Owing to the lightweight, flexibility, and molecular diversity, organic photothermal materials are considered promising solar absorbent materials for water-evaporating purification. Herein, we utilize the blend of two organic conjugated photothermal materials, PM6 and Y6, with broadband solar absorption from 350 to 1000 nm and high-efficiency photothermal properties to fabricate a Janus water evaporator on cellulose paper. Similar to the asymmetric wetting behavior on the lotus leaf, the evaporator shows efficient water adhesion on the bottom surface and water repellency on the top surface for a desirable self-floating capability and salt resistance. With a mass of only 0.5 mg per 3.14 cm 2 , the PM6:Y6 blend-based water evaporator achieves 88.9% of solar thermal conversion efficiency (η) and 1.52 kg m À2 h À1 of solar water evaporation rate (m) under 1.0 kW m À2 solar irradiation. These properties are almost the best performance among purely
Actuators based on stimuli‐responsive polymers (SRP) have great potential applications in soft robots, remote control, artificial muscle, etc., but their practical robustness is usually limited by mechanical strength and environmental tolerance. Inspired by the unique “muscle‐cartilage” structure of Skate fin, a general strategy is developed for improving the mechanical strength and environmental tolerance of SRP actuators by introducing a twill cotton fabric as the supporting cartilage. Besides, benefiting from the special twill pattern and micro‐nano substructure of the fabric layer, the prepared SRP actuator possesses anisotropic actuation and fast wet recovery, which further enriches its versatility. This SRP actuator can be extended to complicated actuation systems with programmable motion series or cyclic task execution by simply heat‐soldering or assembling with other functional components. The method provides an idea in simultaneously addressing the practical robustness and rich extensibility of SRP actuators, facilitating their application in complex environments or multi‐tasking scenarios.
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