Scholarlink

<p>The use of nanoadditives in lubricating oils offers a potential alternative to conventional additives, although few studies report the use of carbon nanofibers (CNFs) as nanoadditives. This study explores the addition of CNFs to synthetic oil (SO) and olive oil (VO), focusing on their thermophysical and tribological properties. The Space and Time-resolved Extinction Profiles (STEP™) technique was employed to assess the stability of the nanolubricants. Rheological behavior was analyzed at low (&lt; 10<sup>3</sup> s<sup>−1</sup>) and high (10<sup>4</sup> s<sup>−1</sup>) shear rates using rotational rheometry and microfluidics at temperatures ranging from 20 to 80 °C. Thermogravimetric analysis (TGA) evaluated thermal stability, and tribological tests were conducted using a ball-on-disk configuration. The results indicated that VO-CNFs had a shelf life of over seven months—more than four times longer than SO-CNFs, which remained stable for only 48 days. CNFs increased the viscosity of the nanolubricants. Additionally, pure oils exhibited Newtonian behavior, while the nanolubricants containing CNFs exhibited non-Newtonian, shear thinning behavior at low shear rates, corroborating the Power law model. The SO-CNFs and VO-CNFs showed thermal stability improvements with an increase in T<sub>onset</sub> of ~ 21.7 and 5.9%, respectively, compared to pure oils. However, the addition of CNFs did not significantly impact tribological performance. Significant performance differences were observed between the lubricants, with VO-based oils showing an 18.75% reduction in the coefficient of friction (COF) and a nearly 50% reduction in wear rate compared to synthetic oils. Overall, this study enhances the understanding of CNFs as nanoadditives in lubricating oils, highlighting their superior thermophysical properties compared to pure oils.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Evaluating carbon nanofibers as nanoadditives in synthetic and olive oils: stability, rheology, and tribological performance

  • 期刊论文

  • 发表日期：

    2025年12月6日

查看全文
  • Sílvia Betta Canever,
  • Marcela Sagrilo Frizzo,
  • João Batista Rodrigues Neto,
  • Agenor de Noni Júnior,
  • Rodrigo Moreno,
  • Sergio Yesid Gómez González

摘要

The use of nanoadditives in lubricating oils offers a potential alternative to conventional additives, although few studies report the use of carbon nanofibers (CNFs) as nanoadditives. This study explores the addition of CNFs to synthetic oil (SO) and olive oil (VO), focusing on their thermophysical and tribological properties. The Space and Time-resolved Extinction Profiles (STEP™) technique was employed to assess the stability of the nanolubricants. Rheological behavior was analyzed at low (< 103 s−1) and high (104 s−1) shear rates using rotational rheometry and microfluidics at temperatures ranging from 20 to 80 °C. Thermogravimetric analysis (TGA) evaluated thermal stability, and tribological tests were conducted using a ball-on-disk configuration. The results indicated that VO-CNFs had a shelf life of over seven months—more than four times longer than SO-CNFs, which remained stable for only 48 days. CNFs increased the viscosity of the nanolubricants. Additionally, pure oils exhibited Newtonian behavior, while the nanolubricants containing CNFs exhibited non-Newtonian, shear thinning behavior at low shear rates, corroborating the Power law model. The SO-CNFs and VO-CNFs showed thermal stability improvements with an increase in Tonset of ~ 21.7 and 5.9%, respectively, compared to pure oils. However, the addition of CNFs did not significantly impact tribological performance. Significant performance differences were observed between the lubricants, with VO-based oils showing an 18.75% reduction in the coefficient of friction (COF) and a nearly 50% reduction in wear rate compared to synthetic oils. Overall, this study enhances the understanding of CNFs as nanoadditives in lubricating oils, highlighting their superior thermophysical properties compared to pure oils.

Graphical abstract