Abstract
Eight kinds of GOs with different oxidation degree were synthesized. Molecular structure characterization indicated that with more usage of H2SO4, less usage of KMnO4, and more reaction time at high temperatures (95 °C), the oxidation degree of GO decreased. Tribological tests showed that GO water suspensions could reduce the friction coefficient of water by 33–46% as well as decrease the wear rate of water by 36–64%. Lubrication mechanism verified the formation of GO tribofilms on the sliding surface. GO with higher oxidation degree had a better adsorption capacity and the optimum concentration was 0.15 mg/ml. Moreover, some oxygen-containing groups of GO were decomposed to form a graphene-like structure, which would increase the tribological property of GO suspensions.
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We thank the National Natural Science Foundation of China (Grant No. 21703279) and the Shanghai Municipal “Science and Technology Innovation Action Plan” International Cooperation Project (No. 15540723600) for financial support.
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Zhao, L., Yang, H., Liu, C. et al. The Correlation Between Molecular Structure and Tribological Properties of Graphene Oxide with Different Oxidation Degree. Tribol Lett 67, 85 (2019). https://doi.org/10.1007/s11249-019-1199-y
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DOI: https://doi.org/10.1007/s11249-019-1199-y