Oriented lamellar PEG-based nanocomposite with adjustable thermal transfer efficiency for efficient atmospheric water harvesting  

具有可调热传导效率的取向片层PEG基纳米复合材料用于高效大气集水

作　　者：Yanyan Ma Jifeng Li Tao Ding Qichun Feng Zhaofang Du 马艳艳;李继丰;丁涛;封其春;杜兆芳(Anhui Province Joint Key Laboratory of Cold Insulation Fiber and Clothing,Anhui Provincial Engineering Center for Automotive Highly Functional Fiber Products,School of Materials and Chemistry,Anhui Agricultural University,Hefei 230036,China;Institute of Intelligent Machines,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]Anhui Province Joint Key Laboratory of Cold Insulation Fiber and Clothing,Anhui Provincial Engineering Center for Automotive Highly Functional Fiber Products,School of Materials and Chemistry,Anhui Agricultural University,Hefei 230036,China [2]Institute of Intelligent Machines,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China

出　　处：《Science China Materials》2025年第1期244-252,共9页中国科学(材料科学)(英文版)

基　　金：Colleges and Universities Science Foundation of Anhui Province (2022AH050908);Anhui Agricultural University Introduction of High-level Talent Funds(RC362202);University Synergy Innovation Program of Anhui Province(GXXT-2023-037);Anhui Province Rural Revitalization Collaborative Technology Service Center Construction Project。

摘　　要：Water loss rate is crucial in evaluating the efficiency of atmospheric water harvesting(AWH)materials.However,most moisture-absorbing salts and gels have fixed heat transfer rates,limiting the development of high-performance AWH materials.Herein,an anisotropic PEG/CS/MF nanocomposite(APCM)with adjustable thermal transfer efficiency is presented.APCM was synthesized using polyethylene glycol(PEG),melamine foam(MF),and chitosan(CS)solution through a freeze orientation method.The resulting material exhibits a stable oriented laminated structure formed by hydrogen bonding between PEG,CS,and MF.This unique structure imparts excellent mechanical properties.APCM’s large lamellar gaps and pore diameters enable rapid absorption of atmospheric water molecules at low temperatures without leakage(61.79 kg m^(−3)).The compressible nature of APCM allows for efficient heat transfer at high temperatures,and the release of 80%of absorbed water within 15 min.In a proof-of-concept demonstration using a custom-built AWH device,each cubic meter of APCM achieved three AWH cycles within 24 h,producing over 185 kg of water.Therefore,this innovative design offers a promising solution for enhancing the efficiency of AWH,potentially addressing water scarcity issues in various regions.失水速率是衡量材料大气集水(AWH)性能的重要因素.然而,大多数吸湿盐和凝胶具有固定的热传输速率,限制了高性能AWH材料的发展.本文提出了一种传热效率可调的各向异性材料,以聚乙二醇(PEG)、壳聚糖(CS)溶液和三聚氰胺泡沫(MF)为原料,采用冷冻取向法合成PEG/CS/MF纳米复合材料(APCM).氢键驱动PEG/CS层状结构稳定的分散在MF骨架中,并赋予APCM优异的机械性能. APCM的层状间隙使得其能够在室温下快速吸收大气中的水分子而不泄漏(61.79 kg m^(-3)).此外,取向层状结构还赋予了APCM在压缩状态下高效传热和释放所吸收的水分子的能力.作为概念验证演示,每立方米APCM可在24小时内实现3次AWH循环,并生产超过185 kg的液态水.因此,这种创新的结构设计能够提高AWH的效率,并有望为干旱地区的水资源短缺问题提供可行路径.

关 键 词：oriented lamellar structure atmospheric water harvesting adjustable thermal transfer efficiency rapid absorption of water efficient water harvesting 

分 类 号：TB332[一般工业技术—材料科学与工程]