Viscosity and friction reduction of double end capped polyalkylene glycol nanolubricants for eco friendly refrigerant

Mohd Zaki, Sharif and Wan Hamzah, Azmi and Mohd Fairusham, Ghazali and Nurul Nadia, Mohd Zawawi and Hafiz, Muhammad Ali (2023) Viscosity and friction reduction of double end capped polyalkylene glycol nanolubricants for eco friendly refrigerant. Lubricants, 11 (129). pp. 1-17. ISSN 2075-4442 (Online). (Published)

Viscosity and friction reduction of double-end-capped polyalkylene glycol nanolubricants.pdf
Available under License Creative Commons Attribution.

Download (3MB) | Preview


In sustainable tribology, researchers are investigating methods to enhance tribological performance by incorporating nanoparticles into lubricants. However, one potential drawback of this strategy is increased lubricant viscosity. The current study aimed to assess the impact of these nanoparticles on the viscosity and coefficient of friction (COF) of the nanolubricants. Three different nanolubricants were synthesized through a two-step process, including mono-nanolubricants (Al2O3/DEC PAG and SiO2/DEC PAG) and hybrid nanolubricants (Al2O3-SiO2/DEC PAG), at volume concentrations between 0.01% and 0.05%. The viscosity and shear flow behavior of these nanolubricants were evaluated using a digital rheometer, while the COF was measured using a Koehler four-ball tribometer. All the nanolubricants showed Newtonian behavior during the experiments. The dynamic viscosity velocity increment of SiO2/DEC PAG was found to be the lowest (1.88%), followed by Al2O3-SiO2/DEC PAG (2.74%) and Al2O3/DEC PAG (3.56%). The viscosity indices of all the nanolubricants were improved only at higher concentrations. At a volume concentration of 0.03%, the Al2O3-SiO2/DEC PAG nanolubricant reduced the COF by up to 8.1%. The results showed that the combination of nanoparticles, temperature, and volume concentration significantly influenced the viscosity and COF of nanolubricants. This study provides essential information for developing high-performance nanolubricants with improved viscosity and COF and advancing environmentally friendly tribology solutions.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Double-end-capped PAG; Friction reduction; Nanolubricants; Refrigeration system; Viscosity
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Faculty/Division: Institute of Postgraduate Studies
Faculty of Mechanical and Automotive Engineering Technology
Centre for Research in Advanced Fluid & Processes (Fluid Centre)
Depositing User: Mr Muhamad Firdaus Janih@Jaini
Date Deposited: 20 Jun 2023 06:49
Last Modified: 20 Jun 2023 06:49
Download Statistic: View Download Statistics

Actions (login required)

View Item View Item