| 柠檬酸在磁性纳米粒子上的吸附及性能表征 |
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| 引用本文： | 刘冰,王德平,黄文旵.柠檬酸在磁性纳米粒子上的吸附及性能表征[J].功能材料,2007,38(7):1074-1077. |
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| 作者姓名： | 刘冰 王德平 黄文旵 |
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| 作者单位： | 同济大学,材料科学与工程学院,上海,200092 |
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| 基金项目： | 国家自然科学基金
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上海市纳米科技专项基金 |
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| 摘 要： | 采用柠檬酸对Fe3O4磁性纳米粒子进行表面改性,制备了高稳定性的水基磁流体.利用衰减全反射红外光谱(ATR-FTIR)、热重分析(TG)、透射电镜(TEM)、X射线衍射(XRD)和振动样品磁强计(VSM)对改性前后的磁性粒子进行了表征.结果表明,柠檬酸在Fe3O4表面的吸附是氢键、静电力和共价键共同作用的结果,pH为4.8时化学吸附达到最大,符合Langmuir等温吸附,建立了等温吸附方程,饱和吸附量为100mg/g.
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| 关 键 词： | 柠檬酸 Fe3O4 磁流体 吸附 |
| 文章编号： | 1001-9731（2007）07-1074-04 |
| 修稿时间： | 2006-12-202007-04-12 |
The absorption and characterization of citric acid on magnetic nanoparticles |
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| LIU Bing,WANG De-ping,HUANG Wen-hai.The absorption and characterization of citric acid on magnetic nanoparticles[J].Journal of Functional Materials,2007,38(7):1074-1077. |
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| Authors: | LIU Bing WANG De-ping HUANG Wen-hai |
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| Affiliation: | School of Material Science and Engineering,Tongji University,Shanghai 200092,China |
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| Abstract: | Stable chemically aqueous magnetic fluids were synthesized by modifying the surface of Fe3O4 magnetic nanoparticles using citric acid solution.The magnetic nanoparticles before and after surface modification were characterized by attenuated total reflectance Fourier transform infrared spectrometry(ATR-FTIR),thermogravimetry(TG),transmission electron microscopy(TEM),X-ray diffraction(XRD) and vibrating sample magnetometer(VSM).The measurement results show that citric acid was absorbed on the surface of Fe3O4 magnetic nanoparticles due to the driving force of hydrogen bonds,static reaction and covalent bonds.The chemical absorption displayed strongest when pH of solution reached 4.8,which conforms to Langmuir isotherm equation with a saturated adsorption value of 100mg/g. |
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| Keywords: | citric acid Fe3O4 magnetic fluids absorption |
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