Study of graphene nanolubricant using thermogravimetric analysis
| Autor: | Mohammad Khalid, Rashmi Walvekar, Andy Chan, T.C.S.M. Gupta, Abdul Khaliq Rasheed |
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| Rok vydání: | 2015 |
| Předmět: |
Thermogravimetric analysis
Materials science medicine.diagnostic_test Graphene Mechanical Engineering Kinetics Nanoparticle 02 engineering and technology Activation energy 021001 nanoscience & nanotechnology Condensed Matter Physics law.invention 020303 mechanical engineering & transports 0203 mechanical engineering Chemical engineering Mechanics of Materials law Spectrophotometry Zeta potential medicine General Materials Science 0210 nano-technology Mineral oil medicine.drug |
| Zdroj: | Publons |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2015.359 |
| Popis: | Thermal degradation of graphene based mineral oil lubricants was studied using thermogravimetric analysis (TGA). As-synthesized graphene sheets of 8, 12, and 60 nm thick and engine oil formulations 20W50 SN/CF and 20W50 SJ/CF were used for synthesizing various test samples. UV-Vis spectrophotometry, zeta potential, field emission scanning electron microscopy, and energy-dispersive x-ray spectroscopy were used to characterize the graphene sheets and the nanolubricants. TGA revealed that the onset temperature of oxidation for the SN/CF oil could be delayed by 13–17 °C in the presence of graphene. Moreover the rate of oxidation when the weight loss of oil in the presence of graphene reaches 40–20% could be delayed by more than 30 °C. Resistance to oil degradation depends strongly on the graphene nanoparticle size and concentration. TGA kinetics studies show that the base oils have higher activation energy (Ea) and the addition of graphene significantly reduces Ea. |
| Databáze: | OpenAIRE |
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