反射损耗
材料科学
微波食品加热
多孔性
层状结构
碳化
碳纤维
吸收(声学)
复合材料
矿物学
化学工程
化学
复合数
扫描电子显微镜
物理
量子力学
工程类
作者
Qiong Shi,Yan Zhao,Mengyu Li,Bing-Guo Li,zhentao Hu
标识
DOI:10.1016/j.jcis.2023.03.062
摘要
Biomass derived carbon has attracted extensive attention in the field of microwave absorption because of its sustainability and porous structure beneficial to microwave attenuation. In this study, 3D lamellar skeletal network porous carbon was successfully obtained from hull of water chestnut using biomass waste as raw material by controlling the ratio of KOH and precursors in a one-step carbonization process. The optimization of biomass carbon morphology was achieved and its microwave absorption properties were investigated. At the temperature of 600 °C, when the ratio of hull of water chestnut to KOH is 1:1, the porous carbon material with filling ratio of 35% can reach the effective absorption bandwidth (RL < −10 dB) of 6.0 GHz (12–18 GHz) at the matching thickness of 1.90 mm, covering the whole Ku band. When the thickness is 2.97 mm, the optimal reflection loss reaches −60.76 dB. The surface defects, interface polarization and dipole polarization of 3D porous skeleton network structure derived from hull of water chestnut contribute to the excellent reflection loss and bandwidth of porous carbon materials. The porous carbon with low density, low cost and simple preparation method has broad application prospects in the preparation of biomass-derived microwave absorbers.
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