In-situ anchoring of Fe3O4/ZIF-67 dodecahedrons in highly compressible wood aerogel with excellent microwave absorption properties. (15th November 2019)

• Record Type: Journal Article
• Authors: Xu, Lulu; Xiong, Ye; Dang, Baokang; Ye, Zhangning; Jin, Chunde; Sun, Qingfeng; Yu, Xiaohong
• Is Part Of: Materials & design. Volume 182(2019)
• Publication Date: 2019-11-15
• Subjects: Ferromagnetic wood-MOFs composite -- Fe3O4/ZIF-67/wood aerogel -- Hydrogen bonding -- Microwave absorption -- Compression-resilience; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2019.108006
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Lightweight aerogels with superior cavities have attracted great interest in the field of electromagnetic wave absorbing materials. In this work, a hierarchical porous wood aerogel modified with Fe3 O4 /ZIF-67 (Fe3 O4 /ZIF-67@WA) with high compressibility and low-density was fabricated by in-situ anchoring of magnetic Fe3 O4 /ZIF-67 rhombohedral dodecahedron in naturally delignified wood aerogel. Combining the advantages of both aerogels and magnetic Fe3 O4 /ZIF-67 particles, Fe3 O4 /ZIF-67@WA reveals excellent compression-resilience and efficient microwave absorption performance. It possesses a maximum reflection loss (RL) of about −23.4 dB at a low thickness of 1.5 mm and a specific electromagnetic shielding effectiveness of up to ~156.3 dB cm 3 g −1 . Moreover, the composites exhibit a broad absorption bandwidth under an ultrahigh frequency of 13.5–18.0 GHz. In view of those excellent absorbing effects, the prepared green magnetic Fe3 O4 /ZIF-67@WA is likely to be used as a lightweight shielding material against electromagnetic radiation, especially for smart building and miniaturized device applications. Graphical abstract: Unlabelled Image Highlights: A hierarchical porous wood aerogel with Fe3 O4 /ZIF-67 anchored in situ is designed. Fe3 O4 /ZIF-67@wood aerogel possesses high compressibility and low-density. Fe3 O4 /ZIF-67@wood aerogel shows a broad absorption bandwidth under an ultrahigh frequency. The composite achieves excellent compression-resilience and efficient microwave absorption performance.