Efficient Electromagnetic Wave Absorption and Thermal Infrared Stealth in PVTMS@MWCNT Nano‑Aerogel via Abundant Nano‑Sized Cavities and Attenuation Interfaces  

作　　者：Haoyu Ma Maryam Fashandi Zeineb Ben Rejeb Xin Ming Yingjun Liu Pengjian Gong Guangxian Li Chul B.Park 

机构地区：[1]College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,24 Yihuan Road,Nanyiduan,Chengdu 610065,Sichuan,People’s Republic of China [2]Microcellular Plastics Manufacturing Laboratory,Department of Mechanical and Industrial Engineering,University of Toronto,5 King’s College Road,Toronto,ON M5S 3G8,Canada [3]Jiangsu JITRI Advanced Polymer Materials Research Institute,Tengfei Building,88 Jiangmiao Road,Jiangbei New District,Nanjing 211800,Jiangsu,People’s Republic of China [4]MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,International Research Center for X Polymers,Zhejiang University,38 Zheda Road,Hangzhou 310027,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第1期370-383,共14页纳微快报（英文版）

基　　金：the National Natural Science Foundation(No.52073187);NSAF Foundation(No.U2230202)for their financial support of this project;National Natural Science Foundation(No.51721091);Programme of Introducing Talents of Discipline to Universities(No.B13040);State Key Laboratory of Polymer Materials Engineering(No.sklpme2022-2-03);support of China Scholarship Council

摘　　要：Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)drying.The fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal conduction and thermal convection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(cover all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial combination of the above nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)coefficient ratio of 25.4 and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.

关 键 词：Nano-pore size Heterogeneous interface Electromagnetic wave absorption Thermal infrared stealth Nano-aerogel 

分 类 号：TB3[一般工业技术—材料科学与工程]