CAJ | 학술논문

以 FeCl3.6 H 2 O 和 FeSO 4.7 H 2 O 为铁源,采用化学共沉淀法制备纳米级 Fe3 O 4磁颗粒,并用油酸钠对其进行表面包覆；将包覆后的 Fe3 O 4磁颗粒在真空干燥箱中加热氧化,通过氧化时间的控制得到部分氧化的γ-Fe2 O 3/Fe3 O 4复合磁性颗粒以及完全氧化的γ-Fe2 O 3磁性颗粒；以硅油为载液制备出Fe3 O 4磁流体 A、γ-Fe2 O 3磁流体 B、部分氧化的γ-Fe2 O 3/Fe3 O 4复合磁流体 C.研究发现 Fe3 O 4磁颗粒尺寸分布较窄,尺寸的单分散性好,平均粒径在10 nm左右,整体上呈现为类球形；Fe3 O 4磁颗粒部分和完全氧化制得的磁颗粒的粒径和形貌并无明显变化,粒径仍为10 nm 左右,整体上也呈现为类球形.测试结果表明,样品 A、B 和 C 的饱和磁化强度分别达到12．45,14．25和25．08 A.m2/kg,且它们在外加磁场下均呈现出良好的各向异性.
이 FeCl3.6 H 2 O 화 FeSO 4.7 H 2 O 위철원,채용화학공침정법제비납미급 Fe3 O 4자과립,병용유산납대기진행표면포복；장포복후적 Fe3 O 4자과립재진공간조상중가열양화,통과양화시간적공제득도부분양화적γ-Fe2 O 3/Fe3 O 4복합자성과립이급완전양화적γ-Fe2 O 3자성과립；이규유위재액제비출Fe3 O 4자류체 A、γ-Fe2 O 3자류체 B、부분양화적γ-Fe2 O 3/Fe3 O 4복합자류체 C.연구발현 Fe3 O 4자과립척촌분포교착,척촌적단분산성호,평균립경재10 nm좌우,정체상정현위류구형；Fe3 O 4자과립부분화완전양화제득적자과립적립경화형모병무명현변화,립경잉위10 nm 좌우,정체상야정현위류구형.측시결과표명,양품 A、B 화 C 적포화자화강도분별체도12．45,14．25화25．08 A.m2/kg,차타문재외가자장하균정현출량호적각향이성.
In this paper,Fe3 O 4 magnetic nanoparticles were successfully prepared from FeCl3 .6 H 2 O and FeSO 4 .7 H 2 O by chemical co-precipitation method,and their surface was modified by sodium oleate.The γ-Fe2 O 3 magnetic nanoparticles were obtained by full thermal oxidizing of Fe3 O 4 and the composite magnetic particles (γ-Fe2 O 3 and Fe3 O 4 )were achieved by partial thermal oxidizing of Fe3 O 4 .Using silicone oil as carrier liquid and oleic acid as surface modification agent,Fe3 O 4 magnetic fluid,γ-Fe2 O 3 magnetic fluid,and the composite mag-netic fluid (γ-Fe2 O 3 and Fe3 O 4 )were prepared.It was found that the appearance of magnetic nanoparticles was not changed during the thermal oxidizing.The mean size of all magnetic nanoparticles were about 10-20 nm.The saturation magnetization of these magnetic fluids prepared was 12.45,14.25 and 25.08 A.m2/kg.