【作者】 张伟； 沈辉； 谢民强； 胡孙林； 夏建汉； 林逸云；

【Author】 ZHANG Wei~(1,2) SHEN Hui~1 XIE Min-qiang~3 HU Sun-lin~1 XIA Jian-han~1 LIN YI-Yun~2 (1.Institute for Solar Energy Systems,Sun Yat-Sen University,Guangzhou 510275,China; 2.School of Physics & Optoelectric Engineering,Guangdong University of Technology,Guangzhou 510006,China; 3.The Third Affiliated Hospital,Sun Yat-Sen University,Guangzhou 510630,China)

【机构】 中山大学太阳能系统研究所； 中山大学附属第三医院； 广东工业大学物理与光电工程学院；

【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·m²/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．更多还原

【Abstract】 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 σ_s can be 0.36 A·m²/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.更多还原