| US 7,569,205 B1 | ||
| Nanodiamond fractional and the products thereof | ||
| Suzanne Ani Ciftan Hens, Durham, N.C. (US); Scott L. Wallen, Chapel Hill, N.C. (US); and Olga Alexander Shenderova, Raleigh, N.C. (US) | ||
| Assigned to International Technology Center, Raleigh, N.C. (US) | ||
| Filed on Sep. 07, 2007, as Appl. No. 11/899,885. | ||
| Claims priority of provisional application 60/842960, filed on Sep. 08, 2006. | ||
| Int. Cl. B01J 3/06 (2006.01); D01F 9/12 (2006.01); C01F 17/00 (2006.01); C09G 1/02 (2006.01); B24D 3/02 (2006.01) | ||
| U.S. Cl. 423—446 [423/447.1; 423/263; 51/307; 51/308; 51/309; 106/3] | 17 Claims |
| 1. A method of processing detonation nanodiamonds to fractionate the detonation nanodiamonds comprising, in order:
providing detonation nanodiamonds,
forming a combination consisting essentially of said detonation nanodiamonds and a solvent,
said nanodiamonds exhibiting a positive zeta potential in said solvent,
said solvent consisting essentially of DMSO making up at least approximately 10% DMSO (v/v) in the solvent with any balance
of the solvent consisting essentially of a polar solvent, wherein the DMSO increases or stabilizes the magnitude of the positive
zeta potential of the detonation nanodiamonds in the combination,
applying a dispersive technique to said combination,
subjecting said combination to a procedure that causes nanodiamond particles of a first size range to be substantially spatially
separated from nanodiamonds of a second size range, and
collecting said nanodiamonds of said first size range essentially free of said second size range.
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