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Carbon black was oxidized (OCB) and added in the concentrations from 0.05 to 0.50 wt% to various aqueous solutions containing Poly(acrylamide-co-acrylic acid 1 wt%) in concentration of 3.0 g L -1 . The nanofluids' viscosity were measured during 150 days and showed that small amount of the OCB nanoparticles improved the viscosity and the stability of aqueous and saline solutions. Therefore, the use of OCB onto polyacrylamide dispersions shows potential application in oil recovery.

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