Aluminium Nanofluids Stability: A Comparison between the Conventional Two-Step Fabrication Approach and the Controlled Sonication Bath Temperature Method

Figure 9

Photographical images of the nanofluid settling behaviour with time using the uncontrolled and 30°C controlled sonication temperature approaches, where the NP concentrations used were (a) 0.1 vol.%, (b) 0.5 vol.%, and (c) 1.0 vol.%.