Dai Ming, Zhao Fei, Fan Juanjuan, Li Qing, Yang Ya, Fan Zhuangjun, Ling Shengjie, Yu Haipeng, Liu Shouxin, Li Jian, Chen Wenshuai, Yu Guihua
Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
Materials Science and Engineering Program and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, 78712, USA.
Adv Mater. 2022 Apr;34(17):e2200865. doi: 10.1002/adma.202200865. Epub 2022 Mar 15.
Dehumidification is significant for environmental sustainability and human health. Traditional dehumidification methods involve significant energy consumption and have negative impact on the environment. The core challenge is to expose hygroscopic surfaces to the air, and appropriately store the captured water and avoid surface inactivation. Here, a nanostructured moisture-absorbing gel (N-MAG) for passive dehumidification, which consists of a hydrophilic nanocellulose network functionalized by hygroscopic lithium chloride, is reported. The interconnected nanocellulose can transfer the captured water to the internal space of the bulky N-MAG, eliminating water accumulation near the surfaces and hence enabling high-rate moisture absorption. The N-MAG can reduce the relative humidity from 96.7% to 28.7% in 6 h, even if the space is over 2 × 10 times of its own volume. The condensed water can be completely confined in the N-MAG, overcoming the problem of environmental pollution. This research brings a new perspective for sustainable humidity management without energy consumption and with positive environmental footprint.
除湿对于环境可持续性和人类健康具有重要意义。传统的除湿方法能耗巨大，且对环境有负面影响。核心挑战在于使吸湿表面暴露于空气中，并妥善储存捕获的水分，同时避免表面失活。在此，报道了一种用于被动除湿的纳米结构吸湿凝胶（N-MAG），它由经吸湿氯化锂功能化的亲水性纳米纤维素网络组成。相互连接的纳米纤维素可将捕获的水分转移至块状N-MAG的内部空间，消除表面附近的积水，从而实现高速吸湿。即使空间体积超过其自身体积的2×10倍，N-MAG仍能在6小时内将相对湿度从96.7%降至28.7%。凝结水可完全被限制在N-MAG内，克服了环境污染问题。这项研究为无能耗且具有积极环境影响的可持续湿度管理带来了新视角。
