Hydrogen bond-induced conduction loss for enhanced electromagnetic attenuation in deep eutectic gel absorbers  

作　　者：Yuntong Wang Shengchong Hui Zhaoxiaohan Shi Zijing Li Geng Chen Tao Zhang Xinyue Xie Limin Zhang Hongjing Wu 

机构地区：[1]MOE Key Laboratory of Material Physics and Chemistry under Extraordinary,School of Physical Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China [2]Queen Mary University of London Engineering School,Northwestern Polytechnical University,Xi’an 710072,China [3]Research&Development Institute of Northwestern Polytechnical University in Shenzhen,Shenzhen 518063,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第3期738-746,共9页矿物冶金与材料学报(英文版)

基　　金：supported by the National Nat-ural Science Foundation of China(Nos.51872238,52074227,and 21806129);the Fundamental Research Funds for the Central Universities,China(Nos.3102018zy045 and 3102019AX11);the Guangdong Basic and Applied Basic Research Foundation,China(No.2024A1515010298);the Natural Science Basic Research Plan in Shaanxi Province of China(Nos.2017JQ5116 and 2020JM-118);the Key Laboratory of Icing and Anti/De-icing of CARDC(No.IADL20220401).

摘　　要：Gels and conductive polymer composites,including hydrogen bonds(HBs),have emerged as promising materials for electro-magnetic wave(EMW)absorption across various applications.However,the relationship between conduction loss in EMW-absorbing materials and charge transfer in HB remains to be fully understood.In this study,we developed a series of deep eutectic gels to fine-tune the quantity of HB by adjusting the molar ratio of choline chloride(ChCl)and ethylene glycol(EG).Owing to the unique properties of deep eutectic gels,the effects of magnetic loss and polarization loss on EMW attenuation can be disregarded.Our results indicate that the quantity of HB initially increases and then decreases with the introduction of EG,with HB-induced conductive loss following similar pat-terns.At a ChCl and EG molar ratio of 2.4,the gel labeled G22-CE2.4 exhibited the best EMW absorption performance,characterized by an effective absorption bandwidth of 8.50 GHz and a thickness of 2.54 mm.This superior performance is attributed to the synergistic ef-fects of excellent conductive loss and impedance matching generated by the optimal number of HB.This work elucidates the role of HB in dielectric loss for the first time and provides valuable insights into the optimal design of supramolecular polymer absorbers.

关 键 词：ABSORBERS hydrogen bonds deep eutectic gels dielectric properties conduction loss 

分 类 号：TQ427.26[化学工程]