High magnetization aqueous ferrofluids and processes for preparation and use thereof
AssigneeXerox Corporation
InventorsRonald F. Ziolo, Elizabeth C. Kroll, Rachel Pieczynski
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Abstract
A ferrofluid comprising an aqueous suspension of an unsilanated or silanated nanocomposite comprised of Fe.sub.2 O.sub.3 nanoparticles and an ionic exchange resin, wherein the ferrofluid has a high magnetization moment of about 20 to about 40 emu/gram.
Claims23
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 Fe.sub.2 O.sub.3 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.
A ferrofluid comprising an aqueous suspension of a nanocomposite comprised of Fe.sub.2 O.sub.3 nanoparticles and an ionic exchange resin, wherein the ferrofluid has a high magnetization moment of about 20 to about 40 emu/gram.
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 Fe.sub.2 O.sub.3 and an ionic exchange resin, wherein the silanated ferrofluid has a high magnetization moment of about 20 to about 40 emu/gram.
Dependencies are inferred from the claim text.