Abstract
In this work, the microwave absorbing materials by the combination of water and bentonite were prepared, in which the water was used as microwave absorbent. The bond angle of water molecule is 104.5°, which is a typical dipole molecule. It is difficult to achieve the full frequency absorption in the X-band by dipole polarization alone. The bentonite particles are nano-layered structure, which can provide a large amount of interfaces and bring rich interfacial polarization. Meanwhile, a large amount of soluble cations is present in the bentonite, which brings in conductive loss when dissolved in water. The prepared water-bentonite composite can realize the full X-band absorption by the synergism effect of dipole polarization, interfacial polarization and conductive loss. The minimum relfection coefficient (RCmin) can reach − 59.8 dB, and the minimum thickness is 2.00 mm to achieve the full-frequency absorption. Due to the network distribution of water in the transparent bentonite matrix, the prepared water-bentonite composite has a low ratio of conductive loss and polarization loss, which is different from the conventional solid absorbents.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 52072303 and 51821091), and National Science and Technology Major Project (J2019-VI-0014-0129).
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Min Zhang took part in designing the study, performed the experiments, analyzed the data and drafted the manuscript. **aomeng Fan designed this study, discussed the results, and gave the final approval of this manuscript. Fang Ye and Jimei Xue contributed to the writing and polishing of the manuscript. Shangwu Fan and Laifei Cheng gave full support to the test in the experiment.
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Zhang, M., Fan, X., Ye, F. et al. Microwave absorption design of water by the combination of dipole polarization and interfacial polarization. J Mater Sci: Mater Electron 33, 6411–6420 (2022). https://doi.org/10.1007/s10854-022-07813-w
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DOI: https://doi.org/10.1007/s10854-022-07813-w