材料科学
生物高聚物
纳米纤维素
电磁屏蔽
层状结构
多孔性
复合材料
纳米纤维
微观结构
纳米技术
铸造
纳米线
纤维素
化学工程
聚合物
工程类
作者
Zhihui Zeng,Tingting Wu,Daxin Han,Qun Ren,Gilberto Siqueira,Gustav Nyström
出处
期刊:ACS Nano
[American Chemical Society]
日期:2020-02-28
卷期号:14 (3): 2927-2938
被引量:248
标识
DOI:10.1021/acsnano.9b07452
摘要
Ultralight and highly flexible biopolymer aerogels, composed of biomimetic cellular microstructures formed from cellulose nanofibers and silver nanowires, are assembled via a convenient and facile freeze-casting method. The lamellar, honeycomb-like, and random porous scaffolds are successfully achieved by adjusting freezing approaches to modulate the relationships between microstructures and macroscopic mechanical and electromagnetic interference (EMI) shielding performances. Combining the shielding transformation arising from in situ compression and the controlled content of building units, the optimized lamellar porous biopolymer aerogels can show a very high EMI shielding effectiveness (SE), which exceeds 70 or 40 dB in the X-band while the density is merely 6.2 or 1.7 mg/cm3, respectively. The corresponding normalized surface specific SE (defined as the SE divided by the material density and thickness) is up to 178235 dB·cm2/g, far surpassing that of the so-far reported shielding materials. Antibacterial properties and hydrophobicity are also demonstrated extending the versatility and application potential of the biopolymer hybrid aerogels.
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