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US 9,321,021 B2Granted
Converting nanoparticles in oil to aqueous suspensions
AssigneeWilliam Marsh Rice University
InventorsMichael S. Wong, Hitesh Ghanshyam Bagaria, Gautam Chandrakanth Kini, Wen Yin Lynn Ko
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Abstract
An improved process for converting an oil suspension of nanoparticles (NPs) into a water suspension of NPs, wherein water and surfactant and a non-surfactant salt is used instead of merely water and surfactant, leading to greatly improved NP aqueous suspensions.
Claims2
A method of converting nanoparticles (NPs) in oil to NPs in aqueous suspension comprising:
- a) dissolving NPs into an oil having a boiling point lower than that of water to provide an oil suspension of NPs;
- b) preparing a surfactant solution in water containing a salting-in electrolyte such that the concentration of the surfactant is above the critical micellar concentration;
- and
- c) adding the NP containing oil blend of step a) to the surfactant solution and stirring the resulting dispersion to form an aqueous suspension of NPs.
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Dependencies are inferred from the claim text.