2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Sonochemical Preparation of Stabilized Magnetite Colloids

B.M. Silverman, B. Zhou
Headwaters Technology Innovation, US

magnetite, colloid, nanoparticles

This research focuses creating highly concentrated iron oxide colloids (10-30% by wt.) consisting of nanoparticles whose aggregrates are not to exceed 200nm. The system consists of the metal oxide powder, organic solvent, and stabilizing agents/surfactants. The iron oxide powder of choice FexOy, (magnetite, maghemite) or other binary iron oxide based materials (M Fe2O4, where M = Ni, Co), is placed in the non-aqueous solvent of choice (preferable methyl methacrylate, ethyl acetate, N-methyl pyrollidone, propylene glycol, various propylene glycol ethers, or any combination there of). The stabilizing agents are then added individually or in combination consisting of linear or branched alkyl carboxylic acids (C4-C18), linear or branched amines, diamines and triamines exceeding C6 in alkyl chain length (with or without aromatic substituents), glycolic acid ethers (family), alcohols exceeding C6 in alkyl chain length, imidazoles, and saccharides. Additionally, surfactants may be used as well (phosphonic acids, phosphinic acids, sulfonic acids). This mixture is then treated sonochemically (while simultaneously chilled (-10 to 10C) and the resulting colloid is devoid of flocculation (on the order of days-months), and has a laser scattering particle size of less than 200nm, and TEM particle size between 5-30nm.

Nanotech 2008 Conference Program Abstract