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以天然埃洛石纳米管(HNTs)为载体,采用部分还原共沉淀法,在HNTs的管内、外沉积Fe3O4纳米晶粒。利用HNTs独特的空间结构,所制备的Fe3O4粒子尺寸为10～30nm,并有效控制其粒子团聚。XRD表明Fe3O4/HNTs复合材料为Fe3O4和埃洛石两相组成,不同温度(373、423、523K)热处理条件下该复合材料具有良好的热稳定性;VSM表明Fe3O4/HNTs复合材料为超顺磁性材料。并对纳米Fe3O4/HNTs复合材料进行表面化学改性,得到分散性良好的水基磁性流体。
Fe3O4 nanocrystals were deposited in and out of the tubes of HNTs by using partially reduced coprecipitates with natural halloysite nanotubes (HNTs) as support. Utilizing the unique spatial structure of HNTs, the prepared Fe3O4 particles have a size of 10-30nm and effectively control particle agglomeration. The results of XRD show that Fe3O4 / HNTs composites are composed of Fe3O4 and halloysite. The composites have good thermal stability under heat treatment at different temperatures (373, 423, 523K). VSM shows that the composites of Fe3O4 / HNTs are superparamagnetic material. The nano-Fe3O4 / HNTs composites were surface chemically modified to obtain water-based magnetic fluids with good dispersion.