Characterization of surface tension and contact angle of nanofluids

Milad Radiom; Chun Yang; Weng Kong Chan

doi:10.1117/12.851278

14 April 2010 Characterization of surface tension and contact angle of nanofluids

Milad Radiom, Chun Yang, Weng Kong Chan

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75221D (2010) https://doi.org/10.1117/12.851278
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

This paper investigates the effects of nanoparticles on surface tension and equilibrium contact angle of TiO₂ - DI water nanofluids. Experimental measurements of surface tension by using the pendant droplet method show that the surface tension of the TiO₂ - DI water nanofluids depends weakly on nanoparticle concentration; however, at higher nanoparticle concentrations the surface tension is lower. Various mechanisms are reported to explain this behavior. Experimental measurements of contact angles of the TiO₂ - DI water nanofluids droplets on borosilicate glass slides exhibit strong nanoparticle dependence, and the general trend is increment of the contact angles with nanoparticle concentration. The effect from the so-called disjoining pressure due to the presence of nanoparticles within the thin nanofluid film wedge at the vicinity of the three-phase contact line is examined. However, the phenomenon is attributed to the pinning of contact line and local changes in solid-liquid interfacial tension due to the depositing of nanoparticles on adsorption sites on solid surface.

Citation Download Citation

Milad Radiom, Chun Yang, and Weng Kong Chan "Characterization of surface tension and contact angle of nanofluids", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75221D (14 April 2010); https://doi.org/10.1117/12.851278

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