Patent ID: 8920682

Claim:
A nanoparticle dispersion comprising: (a) an aqueous liquid medium; (b) an ionic liquid-based stabilizer in the aqueous liquid medium, the ionic liquid-based stabilizer comprising: (i) an aromatic heterocyclic ring having at least one quaternary ammonium cation in the ring, (ii) a counter anion to the quaternary ammonium cation, and (iii) optionally a surfactant moiety covalently bound to the aromatic heterocyclic ring, wherein the ionic liquid-based stabilizer is in the form of a polymer comprising the aromatic heterocyclic rings as pendant groups from the polymer backbone; and (c) nanoparticles dispersed in the aqueous liquid medium, the nanoparticles being present in an amount ranging from 0.01 wt. % to 10 wt. % relative to the dispersion weight.