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Ethylene Glycol Based Ferrofluid for the Fabrication of Magnetically Deformable Liquid Mirrors

Déry, Jean-Philippe and Borra, Ermanno F. and Ritcey, Anna M. (2008) Ethylene Glycol Based Ferrofluid for the Fabrication of Magnetically Deformable Liquid Mirrors. Chemistry of Materials, 20 (20). pp. 6420-6426. ISSN 08974756

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Official URL: http://dx.doi.org/10.1021/cm801075u

Abstract

Stable ferrofluids composed of positively charged magnetic iron oxide nanoparticles coated with 2-[2-(2-methoxyethoxy)ethoxy]acetic acid (MOEEAA) are prepared in ethylene glycol. These new ferrofluids exhibit a magnetic response that is equivalent to that found for corresponding citrate stabilized particles. Unlike the uncoated positively charged particles, nanoparticles coated with MOEEAA and dispersed in ethylene glycol remained stable in the presence of a magnetic field. Infrared spectra indicate that surface grafting occurs through the terminal carboxylate group which is bound to the iron oxide nanoparticles both through bridging and unidentate structures. A surface grafting density of 1.2 molecules/nm2 is determined from thermogravimetry measurements. Although MOEEAA functionalization increases the stability of nanoparticle suspensions in ethylene glycol, surface charge is also essential for the prevention of particle agglomeration. Importantly, the MOEEAA stabilized ferrofluid is compatible with the deposition of surface films of silver nanoparticles and thus allows for the preparation of magnetically deformable liquid mirrors.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nanomagnetics
ID Code:158
Deposited By:Lesley Tobin
Deposited On:11 Nov 2008 16:27
Last Modified:13 Feb 2009 09:05

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