Freiburg Materials Research Center, University of Freiburg, Stefan-Meier-Str. 21, 79104, Freiburg, Germany.
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, 710129, P. R. China.
Small. 2022 Jun;18(25):e2200688. doi: 10.1002/smll.202200688. Epub 2022 May 22.
In spite of efforts to fabricate self-assembled energy storage nanopaper with potential applications in displays, greenhouses, and sensors, few studies have investigated their multiple stimuli-sensitivities. Here, an opto- and thermal-rewrite phase change material/cellulose nanofibril (PCM/CNF) energy storage nanopaper with mechanical regulated performance is facilely fabricated, through 5 min sonication of PCMs and CNFs in an aqueous system. The combination of PCM and CNF not only guarantees the recyclability of PCM without leakage, but also offers nanopaper adaptive properties by leveraging the mobility and optical variation accompanying solid-to-liquid transition of PCM. Besides, trace near-infrared (NIR) dye (IR 780) in it imparts a PCM-embedded nanopaper photothermal effect to modulate the local transparency via time- and position-controlled laser exposure, leading to a reusable opto-writing nanopaper. Furthermore, since the synergistic effect of stick-and-slip function attributes from PCMs and pore structures are produced by calcium ions, the PCM/CNF energy storage nanopaper exhibits excellent mechanically regulated performance from rigid to flexible, which greatly enriches their application in energy-efficient smart buildings and displays.
尽管人们努力制造具有在显示器、温室和传感器中应用潜力的自组装储能纳米纸，但很少有研究调查其多种刺激敏感性。在这里，通过在水体系中对 PCM 和 CNF 进行 5 分钟的超声处理，简便地制造了具有机械调节性能的光热重写相变型储能纤维素纳米纤维（PCM/CNF）纳米纸。PCM 和 CNF 的结合不仅保证了 PCM 的可回收性而不会发生泄漏，而且还利用 PCM 固液转变伴随的流动性和光学变化，为纳米纸提供了适应性特性。此外，其中痕量的近红外（NIR）染料（IR 780）赋予了 PCM 嵌入式纳米纸光热效应，通过时间和位置控制的激光照射来调节局部透明度，从而实现可重复使用的光写入纳米纸。此外，由于 PCM 和钙离子产生的孔结构的粘滑功能协同效应，PCM/CNF 储能纳米纸表现出从刚性到柔性的优异机械调节性能，这极大地丰富了它们在节能智能建筑和显示器中的应用。
