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壳核型磁性纳米纤维素微球的超声制备及表征
阎立峰*,谭琳,杨帆,周密
作者单位E-mail
阎立峰* 中国科技大学化学物理系及选键化学重点实验室,合肥,230026 lfyan@ustc.edu.cn 
谭琳 中国科技大学化学物理系及选键化学重点实验室,合肥,230026  
杨帆 中国科技大学化学物理系及选键化学重点实验室,合肥,230026  
周密 中国科技大学化学物理系及选键化学重点实验室,合肥,230026  
摘要:
以纳米级的Fe3O4液体作为磁核,在非水体系的纤维素DMAc(N-N二甲基乙酰胺)/LiCl溶液中,使用包埋法,在超声波的辅助下制备得到了纳米尺度的壳核型磁性纤维素微球.利用FT-IR、 XRD及AFM/MFM (原子力显微镜/磁场力显微镜)对得到的磁性微球进行了表征,证实该微球由磁性的核与纤维素的壳组成,微球大小为30~50 nm,且具有良好的分散性.并研究了超声条件对磁性微球尺寸的影响.
关键词:  磁性纳米微球  纤维素  壳/核结构  超声波  磁场力显微镜(MFM)
DOI:10.1088/1674-0068/17/6/762-766
分类号:
基金项目:
Preparation and Properties of Magnetic Cellulose Nanoparticle with Core/shell Structure by Ultrasonic Irradiation
Yan Lifeng*,Tan Lin,Yang Fan,Zhou Mi
Abstract:
A kind of cellulose magnetic nanoparticle with a core / shell structure has been prepared by ultrasonic irradiation. Cellulose acts as the shell while Fe3O4 magnetic nanoparticles take the role as the core. Magnetic force microscopy(MFM)with atomic force microscopy(AFM)measurement showed that the size of the magnetic nanoparticles is about 30-50 nm in diameter,while the Fe3O4 core is about 20-30 nm. FT-IR,XRD and MFM was used to provide the chemical and magnetic information of the nanoparticles. The MFM image showed that the nanoparticles separate very well with each other,indicating the cellulose shell produces a good prevention from the aggregation of the Fe3O4 particles. MFM studies also showed two magnetic nanoparticles can form particle-pairs,indicating a weak magneto-dipole interaction between magnetic nanoparticles. It is also found that the average sizes of magnetic nanoparticles have relation to the power of ultrasonic irradiation,and the possible mechanism is discussed.
Key words:  Magnetic nanoparticles,Cellulose,Core/shell structure,Ultrasonic irradiation,Magnetic force miscroscopy(MFM)