Patent ID: 7470650

Claim:
A method of preparing a stable dispersion of carbon nano particles in a liquid, comprising the steps of: dissolving a dispersant comprising a surfactant having a low hydrophile-lipophile balance (HLB) value of 8 or less in an amount of from 0.001 to 30.0 percent, into a major amount of a liquid medium selected from the group consisting of a mineral oil, a hydrogenated oil, a vegetable oil, a synthetic oil, and combinations thereof forming a dispersant liquid medium; adding carbon nano material having an aspect ratio of from 500 to 5,000 in an amount of from 0.01 to 10.0 percent by weight into said dispersant liquid medium with mechanical agitation; forming a uniform suspension of colloidal size solid particles; and adding said uniform suspension of colloidal size solid particles to a shock absorber fluid forming a nanofluid.