Thermo-controlled, self-released smart wood tailored by nanotechnology for fast clean-up of highly viscous liquids
Thermo-controlled, self-released smart wood tailored by nanotechnology for fast clean-up of highly viscous liquids
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DOI：
10.1002/smm2.1133
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发表时间：
2023-02-01
期刊：
影响因子：
20.4
通讯作者：
Fu, Qiliang
中科院分区：
文献类型：
--
作者：
Cai, Yahui;Wu, Jianfei;Fu, Qiliang
设计高度多孔的材料对于液体分离、水净化和消毒（例如溢油清洁和回收、海水净化和油/水分离）是非常重要的。然而，剩下的挑战是生产具有快速吸收、连续定向输送和自释放粘性液体的特性的多孔材料。本文报道了一种功能性纤维素复合材料，其通过对木材进行化学处理和功能化，得到可以热自释放和分离高粘度油的智能木材。智能木材具有1398 mL/（m（2）center dot s）（乙二醇）的高吸收速度和47.2 g/g（氯仿）的最大吸收容量，这是由于其固有的垂直微/纳米通道结构、低弯曲度和高孔隙率。此外，通过在多孔木材上涂覆聚（N-异丙基丙烯酰胺）来实现可切换的润湿性，这使得能够从油/水混合物中收集和去除油。由于在室温下被动放油，高粘度油可以自动释放。经15次循环试验后，其释放量仍保持在91%以上。我们设想，这种功能性智能木材可以扩展到智能水凝胶，微流体，人工药物释放和环境修复等广泛的应用。
Designing highly porous materials is of great importance for liquid separation, water purification, and disinfection, such as spill oil cleaning and recycling, seawater desalting, and oil/water separation. However, a remaining challenge is to produce porous materials with the characteristics of fast absorption, continuous directional transport, and self-release of viscous liquid. Herein, a functional cellulosic composite is reported by the chemical treatment and functionalization of wood resulting in a smart wood that can thermally self-release and separate high viscosity oil. The smart wood has a high absorption speed of 1398 mL/(m(2)center dot s) (ethylene glycol) and a maximum absorption capacity of 47.2 g/g (chloroform) due to its intrinsic vertical micro/nanoscale channel structure, low tortuosity, and high porosity. Moreover, the switchable wettability is achieved by the surface coating of poly(N-isopropylacrylamide) on the porous wood, which enables the collection and removal of oil from the oil/water mixture. The high viscosity oil can be automatically released due to the passive oil release at room temperature. The release capacity of the smart wood remains above 91% after 15 cyclic tests. We envision that this functional smart wood could be extended to a wide range of applications in smart hydrogels, microfluidics, artificial drug release, and environmental restoration.