Assessing colloidal stability of long term MWCNT based nanofluids

► Application of an innovative technique for sedimentation measurement during centrifugation. ► Sedimentation decrease with the CNT concentration rise due to interparticle interaction enhancement. ► Nanoparticles aspect ratio directly contributes to the colloidal stability. ► Dilution of the samples may produce inaccurate results. ► Functionalization techniques enable the production of highly stable nanofluids.