木材趋磁性仿生矿化形成及微波吸收性能

Preparation of the magnetotactic wood through the biomimetic mineralization for application in electromagnetic wave absorption

依据仿生矿化原理,以天冬氨酸为生物分子诱导剂,通过低温溶剂热法在木材表面沉积MnFe_2O_4晶体的方式制备趋磁性木材样品,并采用X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FTIR)、振动磁强计(VSM)和矢量网格(VNA)等方法对试样进行了表征分析。结果显示,在低温碱性的溶剂热矿化条件下,磁性MnFe_2O_4晶体在天冬氨酸的诱导作用下可负载于木材表面形成趋磁性木材;趋磁性木材试样的反射损耗(RL)曲线最小值(-12 dB)出现在频率15.52 GHz时,并且在频率14~17 GHz范围内,试样的RL值小于-9 dB,表明趋磁性木材具有良好的微波吸收性能,是一种优良的防电磁污染的吸波复合材料。

Based on the principle of the biomimetic mineralization and with the aspartic acid as the biomolecule inducer, the magnetotactic wood is prepared through the deposition of the MnFe2O4 crystal on the wood surface via the solvothermal method at low temperature. The asprepared wood is characterized by the X-ray diffraction（XRD）, the scanning electron microscopy（SEM）, the Fourier transform infrared spectroscopy（FT-IR）, the vibrating sample magnetometer（VSM） and the vector network analysis（VNA）. The results show that the magnetic MnFe2O4 could be deposited on the wood surface to form the magnetotactic wood induced by the aspartic acid under the alkaline solvothermal mineralization at low temperature. A minimum reflection loss of the magnetotactic wood is-12 dB at 15.52 GHz.Simultaneously, the RL is below-12 dB ranging from 14 to 17 GHz. Therefore, the magnetotactic wood would find a great potential application for preventing the indoor electromagnetic wave pollution.