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US 8,679,344 B2Granted
Process for solvent shifting a nanoparticle dispersion
AssigneeCerion Technology, Inc.
InventorsThomas D. Allston, Laura M. Herder, Andreas Langner, Kenneth J. Reed
Life of this patent
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Abstract
A process for replacing the continuous phase of a nanoparticle dispersion with a less polar phase, includes filtering the dispersion through a semi-permeable membrane filter to remove the continuous phase, and introducing a less polar phase.
Claims31
A process for replacing the continuous phase of a stable homogeneous nanoparticle dispersion with a less polar phase, the process comprising:
- filtering the dispersion through a diafiltration filter comprising a semi-permeable membrane to remove said continuous phase while maintaining a stable homogeneous nanoparticle dispersion, and
- introducing the less polar phase, maintaining a stable homogeneous nanoparticle dispersion as the continuous phase is replaced with the less polar phase.
A process for forming a stable homogeneous dispersion containing stabilized cerium dioxide nanoparticles, said process comprising:
- a) providing an aqueous first stable homogeneous dispersion comprising stabilized cerium dioxide nanoparticles;
- b) introducing a diluent less polar than water to the stable homogeneous dispersion, maintaining a stable homogeneous dispersion of said stabilized cerium dioxide nanoparticles;
- c) filtering the aqueous stable homogeneous dispersion through a diafiltration filter comprising a semi-permeable membrane to remove water;
- and
- d) combining the filtered stable homogeneous dispersion with a surfactant and a non-polar medium, thereby forming said stable homogeneous dispersion containing stabilized cerium dioxide nanoparticles.
2 more elements
Dependencies are inferred from the claim text.