Abstract The effect of ball-to-powder weight ratio on the crystal composition, microscopic morphology and pore structure of palygorskite was systematically studied by using the conventional wet ball milling process. The quartz can be effectively separated from palygorskite through low-speed centrifugal treatment in aqueous solutions, while the strength of ball milling has a significant influence on disaggregation degree of the crystal bundles. When the ratio is 1:2, the rod crystal bundles are well dissociated, while preserving the inherent aspect ratio of the nanofibers. After the treatment, the specific surface area, micropore volume and micropore area are increased from 206.87 m2/g, 0.0347 cm3/g and 76.07 m2/g to 255.03 m2/g, 0.0502 cm3/g and 109.42 m2/g, respectively. For the first time, the purified palygorskite was used as a template to prepare palygorskite/Fe3O4 nanocomposite using by hydrothermal method, for microwave absorbing applications. As expected, the introduction of palygorskite can effectively prevent the aggregation of the Fe3O4 magnetic particles. Meanwhile, the specific surface area of the composite is enlarged from 10.29 m2/g to 40.73 m2/g, as the weight ratio of Fe3O4 and palygorskite is 2:1, thus leading to enriched interface polarizations and hence resulting in a maximum reflection loss (RL) of −40.41 dB at 4.80 GHz, with effective absorption frequency that can be adjusted over 2–18 GHz by controlling thickness of the composite.

中文翻译：

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以湿法球磨为载体提纯解离生坡缕石提高Fe3O4的微波吸收性能

摘要 采用常规湿式球磨工艺，系统研究了球粉比对坡缕石晶体组成、微观形貌和孔结构的影响。在水溶液中通过低速离心处理可以有效地将石英与坡缕石分离，而球磨强度对晶束的解聚度有显着影响。当比例为 1:2 时，棒状晶体束很好地解离，同时保留了纳米纤维的固有纵横比。处理后的比表面积、微孔体积和微孔面积分别由206.87 m2/g、0.0347 cm3/g和76.07 m2/g增加到255.03 m2/g、0.0502 cm3/g和109.42 m2/g。首次，纯化的坡缕石用作模板，通过水热法制备坡缕石/Fe3O4 纳米复合材料，用于微波吸收应用。正如预期的那样，坡缕石的引入可以有效地防止 Fe3O4 磁性颗粒的聚集。同时，由于 Fe3O4 和坡缕石的重量比为 2:1，复合材料的比表面积从 10.29 m2/g 扩大到 40.73 m2/g，从而导致界面极化丰富，从而导致最大的反射损失（ RL) 在 4.80 GHz 为 -40.41 dB，有效吸收频率可通过控制复合材料的厚度在 2-18 GHz 范围内进行调整。坡缕石的引入可以有效防止Fe3O4磁性颗粒的聚集。同时，由于 Fe3O4 和坡缕石的重量比为 2:1，复合材料的比表面积从 10.29 m2/g 扩大到 40.73 m2/g，从而导致界面极化丰富，从而导致最大的反射损失（ RL) 在 4.80 GHz 为 -40.41 dB，有效吸收频率可通过控制复合材料的厚度在 2-18 GHz 范围内进行调整。坡缕石的引入可以有效防止Fe3O4磁性颗粒的聚集。同时，由于 Fe3O4 和坡缕石的重量比为 2:1，复合材料的比表面积从 10.29 m2/g 扩大到 40.73 m2/g，从而导致界面极化丰富，从而导致最大的反射损失（ RL) 在 4.80 GHz 为 -40.41 dB，有效吸收频率可通过控制复合材料的厚度在 2-18 GHz 范围内进行调整。