Preparation and characterization of silicon oil based ferrofluid
Preparation and characterization of silicon oil based ferrofluid
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DOI：
10.1016/j.apsusc.2011.07.103
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发表时间：
2011-10-01
影响因子：
6.7
通讯作者：
Li, H. Z.
中科院分区：
文献类型：
--
作者：
Chen, H. J.;Wang, Y. M.;Li, H. Z.
本研究制备了稳定的硅油基铁磁流体。使用硅油表面活性剂乙氧基封端的聚二甲基硅氧烷对Fe(3)O(4)纳米颗粒进行改性。首先通过四乙氧基硅烷的水解在Fe(3)O(4)纳米颗粒上涂覆SiO(2)层。然后利用SiO(2)表面的活性羟基，将硅油表面活性剂共价接枝到Fe(3)O(4)纳米粒子表面。乙氧基封端聚二甲基硅氧烷具有相似的分子链结构，与载液相容性好，保证了改性Fe(3)O(4)在载体硅油中的稳定分散。通过IR和XPS对Fe(3)O(4)与改性剂之间的相互作用进行了表征。 Fe(3)O(4)纳米颗粒的晶体结构和磁性能分别通过XRD和VSM测定。使用 TEM 观察颗粒的尺寸和形态。采用古伊磁天平对硅油基铁磁流体的性能进行了表征。结果表明，该铁磁流体具有高磁性和良好的稳定性。还研究了铁磁流体的流变特性和热稳定性。 (C) 2011 Elsevier B.V. 保留所有权利。
Stable silicon oil based ferrofluid was prepared in the present investigation. Silicon oil surfactant ethoxy terminated polydimethylsiloxane was used to modify the Fe(3)O(4) nanoparticles. The Fe(3)O(4) nanoparticles were firstly coated with a SiO(2) layer by the hydrolysis of tetraethoxysilane. Then using the active hydroxyl groups on the surface of the SiO(2), silicon oil surfactant was covalently grafted onto the Fe(3)O(4) nanoparticles surface. The ethoxy terminated polydimethylsiloxane has similar molecular chain structure and good compatibility with that of the carrier liquid, thus ensuring stable dispersion of modified Fe(3)O(4) in the carrier silicon oil. The interaction between Fe(3)O(4) and the modifier was characterized by IR and XPS. The crystal structure and the magnetic properties of the Fe(3)O(4) nanoparticles were determined by XRD and VSM, respectively. The size and morphology of the particles were observed using TEM. The properties of the silicon oil based ferrofluid were characterized by Gouy magnetic balance. The results indicated that the ferrofluid had high magnetism and good stability. The rheological properties and thermostability of the ferrofluid were also investigated. (C) 2011 Elsevier B.V. All rights reserved.