功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2014年
6期
6107-6110
,共4页
Fe3O4磁性颗粒%油酸钠%pH值%饱和磁化强度%分散性
Fe3O4磁性顆粒%油痠鈉%pH值%飽和磁化彊度%分散性
Fe3O4자성과립%유산납%pH치%포화자화강도%분산성
Fe3 O4 magnetic particles%sodium oleate%pH%saturation magnetization%dispersity
采用化学共沉淀法制备纳米 Fe3 O4磁性颗粒,并用油酸钠对其进行包覆改性,以煤油为基液制备出煤油基 Fe3 O4磁流体。对比分析了 pH 值=5和10.5条件下油酸钠包覆的Fe3 O4磁性颗粒的性能差异,得出油酸钠在 pH 值=5时可以更好地包覆在 Fe3 O4磁性颗粒表面,其饱和磁化强度为58.0 A·m2/kg,在此基础上制备出的磁流体的饱和磁化强度为20.2 A·m2/kg,并且 Fe3 O4磁性颗粒分散较均匀。而油酸钠在pH 值=10.5时包覆的 Fe3 O4磁性颗粒,其饱和磁化强度虽然高一些(67.8 A·m2/kg),但制备出的磁流体稳定性较差,出现较为明显的沉降现象。
採用化學共沉澱法製備納米 Fe3 O4磁性顆粒,併用油痠鈉對其進行包覆改性,以煤油為基液製備齣煤油基 Fe3 O4磁流體。對比分析瞭 pH 值=5和10.5條件下油痠鈉包覆的Fe3 O4磁性顆粒的性能差異,得齣油痠鈉在 pH 值=5時可以更好地包覆在 Fe3 O4磁性顆粒錶麵,其飽和磁化彊度為58.0 A·m2/kg,在此基礎上製備齣的磁流體的飽和磁化彊度為20.2 A·m2/kg,併且 Fe3 O4磁性顆粒分散較均勻。而油痠鈉在pH 值=10.5時包覆的 Fe3 O4磁性顆粒,其飽和磁化彊度雖然高一些(67.8 A·m2/kg),但製備齣的磁流體穩定性較差,齣現較為明顯的沉降現象。
채용화학공침정법제비납미 Fe3 O4자성과립,병용유산납대기진행포복개성,이매유위기액제비출매유기 Fe3 O4자류체。대비분석료 pH 치=5화10.5조건하유산납포복적Fe3 O4자성과립적성능차이,득출유산납재 pH 치=5시가이경호지포복재 Fe3 O4자성과립표면,기포화자화강도위58.0 A·m2/kg,재차기출상제비출적자류체적포화자화강도위20.2 A·m2/kg,병차 Fe3 O4자성과립분산교균균。이유산납재pH 치=10.5시포복적 Fe3 O4자성과립,기포화자화강도수연고일사(67.8 A·m2/kg),단제비출적자류체은정성교차,출현교위명현적침강현상。
In this paper,Fe3 O4 magnetic nanoparticles were prepared by chemical co-precipitation method and surface modification by sodium oleate were introduced.The kerosene-based Fe3 O4 magnetic fluid was prepared by using kerosene as carrier liquid.Compared with differences of Fe3 O4 magnetic particles coated by sodium ole-ate in the conditions of pH=5 and 10.5.It showed that the nanoparticles were coated successfully by sodium oleate.The saturation magnetization of Fe3 O4 magnetic nanoparticles was 58.0 A · m2/kg,the saturation magnetization of magnetic fluid prepared was 20.2 A·m2/kg,and Fe3 O4 particles were well-dispersed.Al-though in the case of pH=10.5,Fe3 O4 magnetic particles coated by sodium oleate had a higher saturation mag-netization (67.8 A·m2/kg),but the magnetic fluid was less stable and had a obvious settlement phenomenon.