School of Chemistry and Key Centre for Polymers and Colloids, The University of Sydney, New South Wales 2006, Australia.
ACS Appl Mater Interfaces. 2011 Mar;3(3):662-7. doi: 10.1021/am1012112. Epub 2011 Feb 21.
Ionic liquid ferrofluids have been prepared containing both bare and sterically stabilized 8-12 nm diameter superparamagnetic iron oxide nanoparticles, which remain stable for several months in both protic ethylammonium and aprotic imidazolium room-temperature ionic liquids. These ferrofluids exhibit spiking in static magnetic fields similar to conventional aqueous and nonaqueous ferrofluids. Ferrofluid stability was verified by following the flocculation and settling behavior of dilute nanoparticle dispersions. Although bare nanoparticles showed excellent stability in some ILs, they were unstable in others, and exhibited limited water tolerance. Stability was achieved by incorporating a thin polymeric steric stabilization layer designed to be compatible with the IL. This confers the added benefit of imbuing the ILF with a high tolerance to water.
离子液体铁磁流体已被制备，其中包含裸露和空间稳定的 8-12nm 直径超顺磁氧化铁纳米粒子，在质子乙基铵和非质子咪唑室温离子液体中均能稳定数月。这些铁磁流体在静态磁场中表现出类似于传统的水基和非水基铁磁流体的尖峰现象。通过跟踪稀释纳米粒子分散体的絮凝和沉降行为，验证了铁磁流体的稳定性。尽管裸露的纳米粒子在一些 IL 中表现出优异的稳定性，但在其他 IL 中则不稳定，并且对水的容忍度有限。通过引入薄的聚合物空间稳定化层来实现稳定性，该层设计为与 IL 兼容。这赋予了 ILF 对水的高容忍度的额外好处。
