作　　者： ; ; ; ; ; ;

机构地区： 中山大学物理科学与工程技术学院太阳能系统研究所

出　　处： 《功能材料》 2007年第A03期1190-1192,共3页

摘　　要： 采用共沉淀法制备了药物载体羧甲基壳聚糖改性纳米四氧化三铁（Fe3O4）磁性液体。对一步法（合成Fe3O4颗粒和表面改性同时反应）和两步法（先合成再改性）制备的样品通过X射线衍射（XRD）、傅立叶红外光谱（FTIR）、扫描电镜（SEM）、热重分析（TG）和磁化曲线测定等表征分析比较。改性水基磁性液体性能稳定，改性Fe3O4纳米颗粒粒径在25nm左右，饱和磁化强度为0．36A·m^2/kg，热重和红外分析显示一步法改性表面包裹量多于两步法，结果表明一步法较适合用于制备羧甲基壳聚糖改性的磁性液体． The magnetic liquids adsorpted with carboxymethyl chitosan by means of co-precipitation method was discussed and optimized. The sample made by the one-step（synthesis Fe3O4 particles and surface modification in the meantime） and two-steps（in different times） experiments were characterized by XRD, FTIR, TEM, TG and vibration magnetometer. The ferrofluid is stable and better. The diameter of modified nano-particles is about 25nm, and it＇s saturate magnetism strength as can be 0.36 A·m^2/kg. The weight percentage of carboxymethyl chitosan bound to Fe3O4 nanoparticles by TG and FTIR were estimated by one-step method is more than that by two-steps method. The results presented in this report show that one-step method are suitable to produce magnetic fluids modified by carboxymethyl chitosan.

关 键 词： 四氧化三铁 纳米颗粒 壳聚糖

领　　域： [化学工程]