Title: Experimental study on viscosity of Al2O3/Fe3O4 hybrid nanofluid according to different surfactant additives

Authors: Jeonggyun Ham; Yunchan Shin; Honghyun Cho

Addresses: Department of Mechanical Engineering, Graduate School of Chosun University, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea ' Department of Mechanical Engineering, Graduate School of Chosun University, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea ' Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea

Abstract: Viscosities of 1 wt% Al2O3 and Fe3O4 NFs(nanofluid), and Al2O3/Fe3O4 hybrid NF were investigated experimentally based on surfactant type and pH. Cetrimonium bromide (CTAB) as a cationic surfactant, polyactylic acid (PAA) and sodium dodecyl (SDS) as anionic surfactants, and gum Arabic (GA) as a high molecular surfactant were used to manufacture NFs. The most increase of viscosity in 1wt% Al2O3 NF was presented with the addition of GA. Furthermore, the viscosity ratio of Fe3O4 NF for pH 3 was 1.08, lower than that for other pHs. Surfactant-dependent viscosity of Al2O3/Fe3O4 hybrid NF increased in the following order: GA, CTAB, SDS, and PAA. Al2O3/Fe3O4 hybrid NF viscosity did not increase noticeably with addition of PAA and SDS because the strength of the ionic bond did not increase. The highest increase in viscosity for Al2O3 and Al2O3/Fe3O4 hybrid NFs was observed with the addition of GA.

Keywords: hybrid nanofluid; viscosity; surfactant; pH; dispersion stability; ferrofluid (Fe3O4 nanofluid).

DOI: 10.1504/IJNT.2019.104467

International Journal of Nanotechnology, 2019 Vol.16 No.4/5, pp.237 - 243

Published online: 03 Jan 2020 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article