Stable and Water-Tolerant Ionic Liquid Ferrofluids | Zendy

Nirmesh Jain | Zendy; Xiaoli Zhang | Zendy; Brian S. Hawkett | Zendy; Gregory G. Warr | Zendy

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Stable and Water-Tolerant Ionic Liquid Ferrofluids

Author(s) -

Nirmesh Jain,

Xiaoli Zhang,

Brian S. Hawkett,

Gregory G. Warr

Publication year - 2011

Publication title -

acs applied materials and interfaces

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.535

H-Index - 228

eISSN - 1944-8252

pISSN - 1944-8244

DOI - 10.1021/am1012112

Subject(s) - ferrofluid , materials science , ionic liquid , chemical engineering , steric effects , nanoparticle , aqueous solution , colloid , superparamagnetism , magnetic nanoparticles , iron oxide nanoparticles , nanotechnology , organic chemistry , magnetic field , chemistry , catalysis , physics , magnetization , quantum mechanics , engineering

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.

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