High magnetization aqueous ferrofluids and processes for preparation and use thereof
First Claim
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1. A process for the preparation of a high magnetization aqueous ferrofluid composition comprising:
- providing a low optical density magnetic composition comprising a nanocomposite of particles comprising Fe2 O3 nanoparticles and an ionic exchange resin;
milling the low optical density magnetic composition;
adding liquid vehicle to the composition and thereafter milling the resulting mixture to form a colloidal suspension;
treating the colloidal suspension to form a supernatant and a residue, and thereafter separating the supernatant from the residue; and
exposing the residue to a magnetic field to generate a highly magnetic suspended component and a non- and low magnetic sludge components, wherein the highly magnetic component is an aqueous ferrofluid composition with a high magnetization moment of about 20 to about 40 emu/gram.
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Abstract
A ferrofluid comprising an aqueous suspension of an unsilanated or silanated nanocomposite comprised of Fe2 O3 nanoparticles and an ionic exchange resin, wherein the ferrofluid has a high magnetization moment of about 20 to about 40 emu/gram.
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23 Claims
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1. A process for the preparation of a high magnetization aqueous ferrofluid composition comprising:
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providing a low optical density magnetic composition comprising a nanocomposite of particles comprising Fe2 O3 nanoparticles and an ionic exchange resin; milling the low optical density magnetic composition; adding liquid vehicle to the composition and thereafter milling the resulting mixture to form a colloidal suspension; treating the colloidal suspension to form a supernatant and a residue, and thereafter separating the supernatant from the residue; and exposing the residue to a magnetic field to generate a highly magnetic suspended component and a non- and low magnetic sludge components, wherein the highly magnetic component is an aqueous ferrofluid composition with a high magnetization moment of about 20 to about 40 emu/gram. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A ferrofluid comprising an aqueous suspension of a nanocomposite comprised of Fe2 O3 nanoparticles and an ionic exchange resin, wherein the ferrofluid has a high magnetization moment of about 20 to about 40 emu/gram.
- 16. A ferrofluid comprising an aqueous suspension of a silanated nanocomposite comprised of particles which are altered by treatment with a silanating agent comprised of the product of mixing a silane compound with nanoparticles of Fe2 O3 and an ionic exchange resin, wherein the silanated ferrofluid has a high magnetization moment of about 20 to about 40 emu/gram.
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