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Microwave Synthesis of Molybdenum Disulfide Nanoparticles Using Response Surface Methodology for Tribological
Thachnatharen Nagarajan1,2, Mohammad Khalid2,3, Nanthini Sridewi1
1Faculty of Defense Science and Technology, National Defense University of Malaysia, Kuala Lumpur 57000, Malaysia.
Abstract:
We used response surface methodology (RSM) based on the central composite design (CCD) model to optimize the synthesis time and temperature of the molybdenum disulfide (MoS2) nanoparticles using the flexiWAVE microwave. Furthermore, the synthesized MoS2 nanoparticles were used in SAE 20W50 diesel engine oil to study the tribological properties according to ASTM standards using a four-ball tribotester. The optimization result shows that the synthesis temperature and time for the MoS2 nanoparticles in the microwave were ~200 °C and ~15 min, respectively, with a coefficient of friction (COF) and average wear scar diameter (WSD) of 0.0849 and 320 μm. Furthermore, the difference between the experimental and predicted values was minimal (1.88% (COF) and 0.625% (WSD)), which was similar to the optimization model.
