无表面活性剂全氟聚醚基磁流体的开发研究
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摘要
通过巯基-烯烃的点击反应将全氟辛基乙烯接枝到Fe_3O_4@SiO_2-SH表面,得到一种可自分散到全氟聚醚油中的磁性纳米微粒,最终形成无表面活性剂的全氟聚醚基磁流体。采用傅里叶变换红外光谱仪、X射线衍射仪、透射电镜和振动样品磁强计对所得磁性复合材料进行表征。并将此磁流体置于离心机中以3000r/min的转速,离心10min,测定其稳定性。结果表明:最稳定磁流体的磁性微粒的合成条件为:反应温度40℃,氨水用量4.00mL,Fe~(2+)/Fe~(3+)=1.5∶2(摩尔比),TEOS用量3.00mL,3-巯基丙基三甲氧基硅烷用量1.00mL。用该磁性微粒配制的磁流体在离心条件下无明显分层现象,稳定性最高。
The perfluorooctyl ethylene was grafted onto the surface of Fe_3O_4@SiO_2-SH by the click reaction of mercapto-olefins to obtain a magnetic nanoparticle,which can self-dispersible into perfluoropolyether oil to form stable perfluoropolyether based magnetic fluid without surfactant added in.The obtained composites were characterized by fourier transform infrared spectroscopy,X-ray diffraction,transmission electron microscope and vibrating sample magnetometer.To determine its stability,the magnetic fluid was centrifuged in a high centrifuge at a speed of 3000 r/min for 10 min.The results showed that the modificated magnetic particles in most stable magnetic fluid was synthesized at 40℃,with optional molar ratio of Fe~(2+)/Fe~(3+)=1.5∶2,about 3 mL ammonia and TEOS was added in and 1.00 mL trimethoxysilylpropanethiol was used.
The perfluorooctyl ethylene was grafted onto the surface of Fe_3O_4@SiO_2-SH by the click reaction of mercapto-olefins to obtain a magnetic nanoparticle,which can self-dispersible into perfluoropolyether oil to form stable perfluoropolyether based magnetic fluid without surfactant added in.The obtained composites were characterized by fourier transform infrared spectroscopy,X-ray diffraction,transmission electron microscope and vibrating sample magnetometer.To determine its stability,the magnetic fluid was centrifuged in a high centrifuge at a speed of 3000 r/min for 10 min.The results showed that the modificated magnetic particles in most stable magnetic fluid was synthesized at 40℃,with optional molar ratio of Fe~(2+)/Fe~(3+)=1.5∶2,about 3 mL ammonia and TEOS was added in and 1.00 mL trimethoxysilylpropanethiol was used.
引文
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[2]韩调整,黄英,黄海舰.磁流体的制备及应用[J].材料开发与应用,2012,27(4):86-91,98.
[3]叶楠.弱碱性Fe3O4水基磁流体的制备与稳定机理研究[D].南昌:南昌大学,2013.
[4]叶荣昌,刘书进,高宏,等.磁流体制备技术的研究现状及其存在问题[J].机械工程材料,2003,27(3):33-34,50.
[5]韩会敏,李德才.磁流体制备技术的研究现状与发展方向[J].机械工程师,2007,14(2):25-27.
[6]谭易明,邵慧萍,季业,等.稳定性油基纳米Fe3O4磁性流体的制备与性能研究[J].粉末冶金技术,2012,30(3):163-166.
[7]王秀宇.纳米磁性粉体材料及磁流体的制备[D].天津:天津大学,2003.
[8]何敏博.油基磁流体的制备工艺研究及功能高分子磁性微球的制备[D].武汉:武汉理工大学,2008.
[9]熊隆荣.油酸钠包覆Fe3O4磁流体的制备及其包覆结构研究[D].成都:四川大学,2007.
[10]孙维民,石明浩,张毅,等.全氟聚醚油基磁性液体的制备及耐腐蚀性能研究[J].润滑与密封,2009,34(3):32-35.
[11]徐源鸿,熊兴泉.巯基-烯点击化学[J].化学发展,2012,24(2/3):387-392.
[12] Zolfigol M A,Yarie M.Synthesis and characterization of novel silica-coated magnetic nanoparticles with tags of ionic liquid.application in the synthesis of polyhydroquinolines[J].Rsc Advances,2015,5(125):103617-103624.
[13] Lu Y,Yin Y,Mayers B T,et al.Modifying the surface properties of superparamagnetic iron oxide nanoparticles through a sol-gel approach[J].Nano Letters,2002,2(3):183-186.
[14]马啸华,刘瑛.新型纳米级油酸改性铁氧磁流体磁性粒子的制备及表征[J].化学时刊,2006,20(1):1-8.
[15]刘传勇.磁性四氧化三铁微球的溶剂热法制备及其二氧化硅包覆研究[D].青岛:青岛大学,2014.
[16]赵静.磁流体制备中表面活性剂的选择及其包裹条件的影响[J].应用化工,2008,37(2):198.
[17]张效岩,王英.磁性纳米粒子的制备与应用[J].磁性材料及器件,2004,35(6):14-16.