Thermal Transport and Rheological Properties of Hybrid Nanofluids Based on Vegetable Lubricants

Hélio Ribeiro, Jose Jaime Taha-Tijerina*, Ofelia Gomez, Ever Acosta, Gabriel M. Pinto, Lorena R.C. Moraes, Guilhermino J.M. Fechine, Ricardo J.E. Andrade, Jefferson Reinoza, Victoria Padilla, Karen Lozano

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Nanofluids based on vegetal oil with different wt.% of carbon nanotubes (CNT), hexagonal boron nitride (h-BN), and its hybrid (h-BN@CNT) were produced to investigate the effects of these nano-additives on the thermal conductivity and rheological properties of nanofluids. Stable suspensions of these oil/nanostructures were produced without the use of stabilizing agents. The dispersed nanostructures were investigated by SEM, EDS, XRD, and XPS, while the thermal conductivity and rheological characteristics were studied by a transient hot-wire method and steady-state flow tests, respectively. Increases in thermal conductivity of up to 39% were observed for fluids produced with 0.5 wt.% of the hybrid nanomaterials. As for the rheological properties, it was verified that both the base fluid and the h-BN suspensions exhibited Newtonian behavior, while the presence of CNT modified this tendency. This change in behavior is attributed to the hydrophobic character of both CNT and the base oil, while h-BN nanostructures have lip-lip “bonds”, giving it a partial ionic character. However, the combination of these nanostructures was fundamental for the synergistic effect on the increase of thermal conductivity with respect to their counterparts.

Original languageEnglish
Article number2739
Issue number20
Publication statusPublished - Oct 2023
Externally publishedYes

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Publisher Copyright:
© 2023 by the authors.

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Materials Science


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