Research Papers: Mixed and Boundary Lubrication

Pristine and Alkylated MoS2 Nanosheets for Enhancement of Tribological Performance of Paraffin Grease Under Boundary Lubrication Regime

[+] Author and Article Information
Sooraj S. Rawat

Department of Mechanical Engineering,
Indian Institute of Technology (Banaras Hindu University),
Varanasi 221005, Uttar Pradesh, India
e-mail: soorajsr.rs.mec15@itbhu.ac.in

A. P. Harsha

Department of Mechanical Engineering,
Indian Institute of Technology (Banaras Hindu University),
Varanasi 221005, Uttar Pradesh, India
e-mail: apharsha.mec@itbhu.ac.in

Deepak P. Agarwal

Department of Mechanical Engineering,
Indian Institute of Technology (Banaras Hindu University),
Varanasi 221005, Uttar Pradesh, India
e-mail: agarwal.pdeepak.mec12@itbhu.ac.in

Sangita Kumari

CSIR-Indian Institute of Petroleum,
Dehradun 248005, Uttarakhand, India
e-mail: kushwahasangita@gmail.com

Om P. Khatri

CSIR-Indian Institute of Petroleum,
Dehradun 248005, Uttarakhand, India
e-mail: opkhatri@iip.res.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received January 23, 2019; final manuscript received April 22, 2019; published online May 15, 2019. Assoc. Editor: Min Zou.

J. Tribol 141(7), 072102 (May 15, 2019) (12 pages) Paper No: TRIB-19-1035; doi: 10.1115/1.4043606 History: Received January 23, 2019; Accepted April 22, 2019

In the present study, lubricating grease was developed with paraffin oil and 12-lithium hydroxy stearate metal soap as a thickening agent. MoS2 nanosheets were synthesized by hydrothermal method and functionalized with 1-octadecanethiol (i.e., MoS2-ODT). The MoS2 and MoS2-ODT nanosheets were dispersed in the grease with different concentrations to evaluate its tribological performance. Tribological results unveiled that the addition of MoS2 nanosheets in grease appreciably reduced the coefficient of friction and mean wear volume of tribo-interfaces as compared with pure grease. Energy dispersive spectroscopy (EDS) spectrum revealed the deposition of MoS2 on the worn surface and confirmed a thin tribo-film which protects steel tribo-pair against wear.

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Dai, W., Kheireddin, B., Gao, H., and Liang, H., 2016, “Roles of Nanoparticles in Oil Lubrication,” Tribol. Int., 102(October), pp. 88–98. [CrossRef]
Sahoo, R. R., and Biswas, S. K., 2014, “Effect of Layered MoS2 Nanoparticles on the Frictional Behavior and Microstructure of Lubricating Greases,” Tribol. Lett., 53(1), pp. 157–171. [CrossRef]
Adhvaryu, A., Sung, C., and Erhan, S. Z., 2005, “Fatty Acids and Antioxidant Effects on Grease Microstructures,” Ind. Crops. Prod., 21(3), pp. 285–291. [CrossRef]
Peña-Parás, L., Taha-Tijerina, J., García, A., Maldonado, D., Nájera, A., Cantú, P., and Ortiz, D., 2015, “Thermal Transport and Tribological Properties of Nanogreases for Metal-Mechanic Applications,” Wear, 332(May–June), pp. 1322–1326. [CrossRef]
Ge, X., Xia, Y., and Cao, Z., 2015, “Tribological Properties and Insulation Effect of Nanometer TiO2 and Nanometer SiO2 as Additives in Grease,” Tribol. Int., 92(December), pp. 454–461. [CrossRef]
Chang, H., Lan, C. W., Chen, C. H., Kao, M. J., and Guo, J. B., 2014, “Anti-Wear and Friction Properties of Nanoparticles as Additives in the Lithium Grease,” Int. J. Precis. Eng. Manuf., 15(10), pp. 2059–2063. [CrossRef]
Chen, J., 2010, “Tribological Properties of Polytetrafluoroethylene, Nano-Titanium Dioxide, and Nano-Silicon Dioxide as Additives in Mixed Oil-Based Titanium Complex Grease,” Tribol. Lett., 38(3), pp. 217–224. [CrossRef]
Singh, J., Kumar, D., and Tandon, N., 2017, “Development of Nanocomposite Grease: Microstructure, Flow, and Tribological Studies,” ASME J. Tribol., 139(5), p. 052001. [CrossRef]
Rawat, S. S., Harsha, A. P., and Deepak, A. P., 2018, “Tribological Performance of Paraffin Grease With Silica Nanoparticles as an Additive,” Appl. Nanosci., 9(3), pp. 305–315. [CrossRef]
He, Q., Li, A., Guo, Y., Liu, S., Zhang, Y., and Kong, L., 2018, “Tribological Properties of Nanometer Cerium Oxide as Additives in Lithium Grease,” J. Rare Earths, 36(2), pp. 209–214. [CrossRef]
Gänsheimer, J., and Holinski, R., 1972, “A Study of Solid Lubricants in Oils and Greases Under Boundary Conditions,” Wear, 19(4), pp. 439–449. [CrossRef]
Chang, H., Kao, M. J., Luo, J. D., and Lan, C. W., 2015, “Synthesis and Effect of Nanogrease on Tribological Properties,” Int. J. Precis. Eng. Manuf., 16(7), pp. 1311–1316. [CrossRef]
Wang, L., Wang, B., Wang, X., and Liu, W., 2007, “Tribological Investigation of CaF2 Nanocrystals as Grease Additives,” Tribol. Int., 40(7), pp. 1179–1185. [CrossRef]
Ji, X., Chen, Y., Zhao, G., Wang, X., and Liu, W., 2011, “Tribological Properties of CaCO3 Nanoparticles as an Additive in Lithium Grease,” Tribol. Lett., 41(1), pp. 113–119. [CrossRef]
Wang, L., Zhang, M., Wang, X., and Liu, W., 2008, “The Preparation of CeF3 Nanocluster Capped With Oleic Acid by Extraction Method and Application to Lithium Grease,” Mater. Res. Bull, 43(8–9), pp. 2220–2227. [CrossRef]
Mohamed, A., Osman, T. A., Khattab, A., and Zaki, M., 2015, “Tribological Behavior of Carbon Nanotubes as an Additive on Lithium Grease,” ASME J. Tribol., 137(1), p. 011801. [CrossRef]
Fan, X., Xia, Y., Wang, L., and Li, W., 2014, “Multilayer Graphene as a Lubricating Additive in Bentone Grease,” Tribol. Lett., 55(3), pp. 455–464. [CrossRef]
Akhtar, K., Khalid, H., Haq, I. U., and Malik, A., 2016, “Improvement in Tribological Properties of Lubricating Grease With Quartz-Enriched Rice Husk Ash,” Tribol. Int., 93(January), pp. 58–62. [CrossRef]
Hu, K. H., Hu, X. G., Xu, Y. F., Huang, F., and Liu, J. S., 2010, “The Effect of Morphology on the Tribological Properties of MoS2 in Liquid Paraffin,” Tribol. Lett., 40(1), pp. 155–165. [CrossRef]
Kalin, M., Kogovšek, J., and Remškar, M., 2012, “Mechanisms and Improvements in the Friction and Wear Behavior Using MoS2 Nanotubes as Potential Oil Additives,” Wear, 280(March), pp. 36–45. [CrossRef]
Kumari, S., Gusain, R., Kumar, N., and Khatri, O. P., 2016, “PEG-Mediated Hydrothermal Synthesis of Hierarchical Microspheres of MoS2 Nanosheets and Their Potential for Lubrication Application,” J. Ind. Eng. Chem., 42(October), pp. 87–94. [CrossRef]
Koshy, C. P., Rajendrakumar, P. K., and Thottackkad, M. V., 2015, “Evaluation of the Tribological and Thermo-Physical Properties of Coconut Oil Added With MoS2 Nanoparticles at Elevated Temperatures,” Wear, 330(May–June), pp. 288–308. [CrossRef]
Kumari, S., Mungse, H. P., Gusain, R., Kumar, N., Sugimura, H., and Khatri, O. P., 2017, “Octadecanethiol-Grafted Molybdenum Disulfide Nanosheets as Oil-Dispersible Additive for Reduction of Friction and Wear,” FlatChem, 3(June), pp. 16–25. [CrossRef]
Gan, X., Lv, R., Wang, X., Zhang, Z., Fujisawa, K., Lei, Y., Huang, Z. H., Terrones, M., and Kang, F., 2018, “Pyrolytic Carbon Supported Alloying Metal Dichalcogenides as Free-Standing Electrodes for Efficient Hydrogen Evolution,” Carbon, 132(June), pp. 512–519. [CrossRef]
Liang, T., Sawyer, W. G., Perry, S. S., Sinnott, S. B., and Phillpot, S. R., 2011, “Energetics of Oxidation in MoS2 Nanoparticles by Density Functional Theory,” J. Phys. Chem. C, 115(21), pp. 10606–10616. [CrossRef]
Nagaraju, G., Tharamani, C. N., Chandrappa, G. T., and Livage, J., 2007, “Hydrothermal Synthesis of Amorphous MoS2 Nanofiber Bundles via Acidification of Ammonium Heptamolybdate Tetrahydrate,” Nanoscale Res. Lett., 2(9), p. 461. [CrossRef] [PubMed]
Finnie, K. S., Cassidy, D. J., Bartlett, J. R., and Woolfrey, J. L., 2001, “IR Spectroscopy of Surface Water and Hydroxyl Species on Nanocrystalline TiO2 Films,” Langmuir, 17(3), pp. 816–820. [CrossRef]
ASTM D1403-10, Standard Test Methods for Cone Penetration of Lubricating Grease Using One-Quarter and One-Half Scale Cone Equipment, ASTM International, West Conshohocken, PA.
Sánchez, R., Franco, J. M., Delgado, M. A., Valencia, C., and Gallegos, C., 2011, “Thermal and Mechanical Characterization of Cellulosic Derivatives-Based Oleogels Potentially Applicable as Bio-Lubricating Greases: Influence of Ethyl Cellulose Molecular Weight,” Carbohydr. Polym., 83(1), pp. 151–158. [CrossRef]
Gupta, R. N., and Harsha, A. P., 2017, “Antiwear and Extreme Pressure Performance of Castor Oil With Nano-Additives,” Proc. Inst. Mech. Eng. Part J: J. Eng. Tribol., 232(October), pp. 1055–1067.
Rastogi, R. B., Maurya, J. L., and Jaiswal, V., 2013, “Zero SAPs and Ash Free Antiwear Additives: Schiff Bases of Salicylaldehyde With 1, 2-Phenylenediamine, 1, 4-Phenylenediamine, and 4, 4′-Diaminodiphenylenemethane and Their Synergistic Interactions With Borate Ester,” Tribol. Trans., 56(4), pp. 592–606. [CrossRef]
Stachowiak, G. W., and Batchelor, A. W., 2001, Engineering Tribology, Butter-Worth–Heinemann Publication, Oxford, UK.
Gupta, R. N., and Harsha, A. P., 2017, “Synthesis, Characterization, and Tribological Studies of Calcium–Copper–Titanate Nanoparticles as a Biolubricant Additive,” ASME J. Tribol., 139(2), p. 021801. [CrossRef]
Tannous, J., Dassenoy, F., Lahouij, I., Le Mogne, T., Vacher, B., Bruhács, A., and Tremel, W., 2011, “Understanding the Tribochemical Mechanisms of IF-MoS2 Nanoparticles Under Boundary Lubrication,” Tribol. Lett., 41(1), pp. 55–64. [CrossRef]
Onodera, T., Morita, Y., Suzuki, A., Koyama, M., Tsuboi, H., Hatakeyama, N., Endou, A., Takaba, H., Kubo, M., Dassenoy, F., and Minfray, C., 2009, “A Computational Chemistry Study on Friction of h-MoS2. Part I. Mechanism of Single Sheet Lubrication,” J. Phys. Chem. B, 113(52), pp. 16526–16536. [CrossRef] [PubMed]
Cizaire, L., Vacher, B., Le Mogne, T., Martin, J. M., Rapoport, L., Margolin, A., and Tenne, R., 2002, “Mechanisms of Ultra-Low Friction by Hollow Inorganic Fullerene-Like MoS2 Nanoparticles,” Surf. Coat. Tech., 160(2–3), pp. 282–287. [CrossRef]


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Fig. 1

Flowchart showing the synthesis of MoS2 nanosheets by a hydrothermal approach

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Fig. 2

Low- and high-resolution TEM images of (a) and (b) MoS2 and (d) and (e) MoS2-ODT nanosheets. TEM micrographs of (c) MoS2 and (f) MoS2-ODT along with the corresponding area elemental mapping. The lamellar structure of MoS2 along with interlayer spacing is explicitly seen in high-resolution images.

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Fig. 3

X-ray diffraction patterns of (a) MoS2 and (b) MoS2-ODT nanosheets

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Fig. 4

FTIR spectra of (a) MoS2 and (b) MoS2-ODT nanosheets along with assignments of vibrational features. The inset graphs of MoS2 and MoS2-ODT nanosheets illustrate the Mo-S stretching mode.

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Fig. 5

Thermal degradation patterns of MoS2 and MoS2-ODT nanosheets. The inset graph shows the derivative weight as a function of temperature.

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Fig. 6

Paraffin greases having a variable dose of MoS2 nanosheets: (a) 0.01 wt%, (b) 0.02 wt%, (c) 0.03 wt%, (d) 0.04 wt%, and (e) 0.05 wt%

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Fig. 7

Thermal degradation patterns of paraffin grease doped with 0.04 wt% of (a) MoS2 and (b) MoS2-ODT nanosheets

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Fig. 8

(a) The effect of various concentrations of MoS2 and MoS2-ODT nanosheets in the paraffin grease on the average coefficient of friction and (b) variations of coefficient of friction with time at an optimized concentration of MoS2 (0.04 wt%) and MoS2-ODT (0.01 wt%) nanosheets in the paraffin grease. (c) Wear scar diameter and (d) mean wear volume as a function of the doping concentration of MoS2 and MoS2-ODT nanosheets in the paraffin grease. Percentage reductions in the MWV, WSD, and COF with different concentrations of (e) MoS2 and (f) MoS2-ODT nanosheets in the paraffin grease.

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Fig. 9

Scanning electron images of worn surfaces of steel balls used for the tribo-tests in the presence of (a) and (b) paraffin grease, (c) and (d) 0.04 wt% MoS2-doped grease, and (e) and (f) 0.04 wt% MoS2-ODT-doped grease

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Fig. 10

Topographic images of the worn surfaces of steel balls used in the tribo-tests in the presence of (a) and (b) paraffin grease, (c) and (d) 0.04 wt% MoS2-doped grease, and (e) and (f) 0.04 wt% MoS2-ODT-doped grease. (g) Linear roughness profiles of worn surfaces extracted from topographic images scanned by the AFM.

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Fig. 11

EDS spectra with elemental mapping of worn surfaces of (a) pure grease, (b) 0.04 wt% MoS2-doped paraffin grease, and (c) 0.04 wt% MoS2-ODT-doped paraffin grease

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Fig. 12

Plausible lubrication mechanism revealing the role of MoS2 nanosheets under the tribo-stress



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