文献类型：期刊文献

英文题名：Green Wood Aerogels for Ultrabroadband Near-Perfect Acoustic Absorption

作者：Chai, Huayun[1] Shen, Kuizhong[2] Yang, Yadong[1] Yuan, Jianzhong[1] Yang, Zhenxu[3] Zhou, Zaiyang[1] Xie, Yuzhong[1] Wu, Yiqiang[1] Wan, Caichao[1,4]

第一作者：Chai, Huayun

通信作者：Wan, CC[1];Wan, CC[2]

机构：[1]Cent South Univ Forestry & Technol, Coll Mat & Energy, Changsha 410004, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China;[3]Univ Sydney, Sch Biomed Engn, Sydney, NSW 2006, Australia;[4]Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117585, Singapore

年份：2026

外文期刊名：ACS NANO

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001666721200001)】；

基金：This work is supported by the National Natural Science Foundation of China (grant nos. 32494793, 32330073, and 31890771), the National Key Research and Development Program of China (grant no. 2023YFD2201403), the U40 project of Ministry of Education (grant no. SRICSPYF-BS2025115), the Yuelushan Laboratory Breeding Program (grant no. YLS-2025-ZY01007), the Science and Technology Innovation Program of Hunan Province (grant no. 2024RC1058), and the Training Program for Excellent Young Innovators of Changsha (grant no. kq2406015). C.W. would like to acknowledge the funding support provided by the China Scholarship Council (grant no. 202408430093). We demonstrate our appreciation for English editing software like ChatGPT, DeepSeek, etc., which helped us check grammatical errors in our manuscript.

语种：英文

外文关键词：wood fibers; aerogels; gradient pore circulation; hierarchical ordered structure; ultrabroadband acousticabsorption; superelasticity

摘要：Noise ranks as the world's second-largest environmental risk factor according to the WHO. The simultaneous achievement of ultrabroadband and perfect or near-perfect noise absorption is a quite significant yet long-standing challenge. Here, we propose a "gradient pore circulation (GPC)" strategy for building a hierarchical ordered architecture of green aerogels by using highly active microfibers precisely dissociated from a wood S-2 sublayer as basic units. The aerogels comprise anisotropic, parallelly layered microchannels enriched with multilevel pores within each layer, alongside abundant spring-shaped strips bridging these adjacent layers. Under the "GPC" strategy, the soundwaves effortlessly enter the parallelly layered microchannels possessing moderate flow resistance, while the synergy of long microchannels, multilevel pores, and abundant interlayer strips creates plentiful closed loops, fostering a repetitive cyclic reflection-friction-dissipation of soundwaves. Under these synergies, the aerogels achieve near-perfect acoustic absorption properties, with a sound-absorption coefficient (SAC) of 0.95 to 1 across an ultrabroad frequency range of 520 to 6300 Hz and a superb noise-reduction coefficient of 0.82, the highest recorded to date. More significantly, the aerogels retain excellent sound absorption (SAC > 0.85) even under extreme temperatures (-196 to +80 degrees C), and high humidities (up to 98%) and salt spray environments with mild modifications. Moreover, the aerogels are biodegradable, superelastic, and have strong compression fatigue resistance over 1000 cycles, manifesting great potential as sustainable sound absorption materials for diverse applications.