Abstract
A suitable running-in process is advantageous for reducing friction. The aim of the present work was to study the influence of the running-in with acetylacetone on tribological performance of 4-Cyano-4’-pentylbiphenyl (5CB) liquid crystal. Friction tests were performed between steel surfaces in a ball-on-disk sliding system. After a running-in period of 240 s, the COF of 5CB was measured to be 0.013, which is about a quarter of the value (0.055) without running-in. The reduced contact pressure, caused in running-in process, does not directly lead to a drop in COF. The generation of tris(acetylacetonato) iron(III) induced by the tribochemical reactions between acetylacetone and steel surfaces, and the unique physical properties of liquid crystal are assumed to be reasons for the ultralow COF. Surface analysis was performed to correlate COF with the topography of wear surfaces. An evenly distributed specific grooved structure observed on wear area of the ball may have a beneficial effect on COF as well. We believe our findings can provide an effective and simple solution to reduce COF of liquid crystal between steel surfaces. A better understanding of the tribological behavior is needed for the development of this tribological system and for the possible future applications.
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References
Erdemir, A., Holmberg, K.: Energy Consumption due to Friction in Motored Vehicles and Low-Friction Coatings to Reduce it. Springer, New York (2015)
Holmberg, K., Erdemir, A.: Influence of tribology on global energy consumption, costs and emissions. Friction. 5(3), 263–284 (2017). https://doi.org/10.1007/s40544-017-0183-5
Carrion, F.J., Martinez-Nicolas, G., Iglesias, P., Sanes, J., Bermudez, M.D.: Liquid crystals in tribology. Int. J. Mol. Sci. 10(9), 4102–4115 (2009). https://doi.org/10.3390/ijms10094102
Bermudez, M.D., Jimenez, A.E., Sanes, J., Carrion, F.J.: Ionic liquids as advanced lubricant fluids. Molecules. 14(8), 2888–2908 (2009). https://doi.org/10.3390/molecules14082888
Amann, T., Gatti, F., Oberle, N., Kailer, A., Rühe, J.: Galvanically induced potentials to enable minimal tribochemical wear of stainless steel lubricated with sodium chloride and ionic liquid aqueous solution. Friction. 6(2), 230–242 (2018). https://doi.org/10.1007/s40544-017-0198-y
Prost, J.: The physics of liquid crystals. vol. 83. Oxford University Press, Oxford (1995)
Bahadur, B.: Liquid crystals: applications and uses, vol. 1. World scientific Publishing, Singapore (1990)
Biresaw, G.: Tribology and the liquid-crystalline state. ACS Publications, Washington, DC (1990)
Fischer, T.E., Bhattacharya, S., Salher, R., Lauer, J.L., Ahn, Y.J.: Lubrication by a smectic liquid crystal. Tribol. Trans. 31(4), 442–448 (1988). https://doi.org/10.1080/10402008808981846
Mori, S., Iwata, H.: Relationship between tribological performance of liquid crystals and their molecular structure. Tribol. Int. 29(1), 35–39 (1996)
Sulek, M.W., Wasilewski, T.: Antiseizure properties of aqueous solutions of compounds forming liquid crystalline structures. Tribol. Lett. 18(2), 197–205 (2005). https://doi.org/10.1007/s11249-004-1776-5
Tadokoro, C., Nihira, T., Nakano, K.: Minimization of friction at various speeds using autonomous viscosity control of nematic liquid crystal. Tribol. Lett. 56(2), 239–247 (2014). https://doi.org/10.1007/s11249-014-0404-2
Ważyńska, B., Okowiak, J.A.: Tribological properties of nematic and smectic liquid crystalline mixtures used as lubricants. Tribol. Lett. 24(1), 1–5 (2006). https://doi.org/10.1007/s11249-006-9049-0
Kupchinov, B.I.: Tribology and the liquid-crystalline state. J. Frict. Wear. 30(3), 169–171 (2009). https://doi.org/10.3103/s1068366609030039
Ważyńska, B., Tykarska, M., Okowiak-Chinalska, J.: The estimation of abilities of liquid-crystalline compounds dissolved in paraffin oil for accumulation on solid surface. Mol. Cryst. Liq. Cryst. (2011). https://doi.org/10.1080/15421406.2011.571951
Ghosh, P., Upadhyay, M., Das, M.K.: Studies on the additive performance of liquid crystal blended polyacrylate in lubricating oil. Liq. Cryst. 41(1), 30–35 (2013). https://doi.org/10.1080/02678292.2013.831132
Eidenschink, R., Konrath, G., Kretzschmann, H., Rombach, M.: Unusual lift by shearing mesogenic fluids. Mol. Cryst. Liq. Cryst. Sci. Technol. 330(1), 327–334 (1999). https://doi.org/10.1080/10587259908025606
Amann, T., Kailer, A.: Ultralow friction of mesogenic fluid mixtures in tribological reciprocating systems. Tribol. Lett. 37(2), 343–352 (2009). https://doi.org/10.1007/s11249-009-9527-2
Amann, T., Kailer, A.: Relationship between ultralow friction of mesogenic-like fluids and their lateral chain length. Tribol. Lett. 41(1), 121–129 (2010). https://doi.org/10.1007/s11249-010-9692-3
Amann, T., Kailer, A.: Analysis of the ultralow friction behavior of a mesogenic fluid in a reciprocating contact. Wear. 271(9–10), 1701–1706 (2011). https://doi.org/10.1016/j.wear.2010.12.012
Li, K., Amann, T., Walter, M., Moseler, M., Kailer, A., Rühe, J.: Ultralow friction induced by tribochemical reactions: a novel mechanism of lubrication on steel surfaces. Langmuir. 29(17), 5207–5213 (2013). https://doi.org/10.1021/la400333d
Li, K., Amann, T., List, M., Walter, M., Moseler, M., Kailer, A., Rühe, J.: Ultralow friction of steel surfaces using a 1,3-diketone lubricant in the thin film lubrication regime. Langmuir. 31(40), 11033–11039 (2015). https://doi.org/10.1021/acs.langmuir.5b02315
Amann, T., Kailer, A., Beyer-Faiß, S., Stehr, W., Metzger, B.: Development of sintered bearings with minimal friction losses and maximum life time using infiltrated liquid crystalline lubricants. Tribol. Int. 98, 282–291 (2016). https://doi.org/10.1016/j.triboint.2016.02.023
Amann, T., Kailer, A., Oberle, N., Li, K., Walter, M., List, M., Rühe, J.: Macroscopic superlow friction of steel and diamond-like carbon lubricated with a formanisotropic 1,3-diketone. ACS Omega. 2(11), 8330–8342 (2017). https://doi.org/10.1021/acsomega.7b01561
Liu, D., Li, K., Zhang, S., Amann, T., Zhang, C., Yan, X.: Anti-spreading behavior of 1,3-diketone lubricating oil on steel surfaces. Tribol. Int. 121, 108–113 (2018). https://doi.org/10.1016/j.triboint.2018.01.031
Blau, P.J.: On the nature of running-in. Tribol. Int. 38(11–12), 1007–1012 (2005). https://doi.org/10.1016/j.triboint.2005.07.020
Li, J., Zhang, C., Deng, M., Luo, J.: Superlubricity of silicone oil achieved between two surfaces by running-in with acid solution. RSC Adv. 5(39), 30861–30868 (2015). https://doi.org/10.1039/c5ra00323g
Charles, R.G., Barnartt, S.: Reaction of acetylacetone with metallic iron in the presence of oxygen. J. of Phys. Chem. 62(3), 315–318 (1958)
Sato, K., Kammori, O.: Studies of the direct dissolution of metal in a β-diketone reagent. Bull. Chem. Soc. Jpn. 42(10), 2778–2790 (1969)
Kalatain, E., Vilenkin, A.: Additives used in lubricating oils for foreign aviation gas turbine engines (review of patents). Chem. Technol. Fuels Oils 10(2), 162–166 (1974)
Nakano, K.: Scaling law on molecular orientation and effective viscosity of liquid-crystalline boundary films. Tribol. Lett. 14(1), 17–24 (2003)
Itoh, S., Imura, Y., Fukuzawa, K., Zhang, H.: Anisotropic shear viscosity of photoaligned liquid crystal confined in submicrometer-to-nanometer-scale gap widths revealed with simultaneously measured molecular orientation. Langmuir. 31(41), 11360–11369 (2015). https://doi.org/10.1021/acs.langmuir.5b02713
Gao, M., Ma, L., Luo, J.: Effect of alkyl chain length on the orientational behavior of liquid crystals nano-film. Tribol. Lett. (2016). https://doi.org/10.1007/s11249-016-0663-1
Gao, Y., Ma, L., Luo, J.: Friction anisotropy induced by oriented liquid crystal molecules. Tribol. Lett. (2016). https://doi.org/10.1007/s11249-016-0645-3
Mansare, T., Decressain, R., Gors, C., Dolganov, V.K.: Phase transformations and dynamics of 4-cyano-4′-pentylbiphenyl (5CB) by nuclear magnetic resonance, analysis differential scanning calorimetry, and wideangle X-ray diffraction analysis. Mol. Cryst. 382(1), 97–111 (2002)
Tsai, T.R., Chen, C.Y., Pan, C.L., Pan, R.P., Zhang, X.C.: Terahertz time-domain spectroscopy studies of the optical constants of the nematic liquid crystal 5CB. Appl. Opt. 42(13), 2372–2376 (2003)
Burris, D.L., Sawyer, W.G.: Addressing practical challenges of low friction coefficient measurements. Tribol. Lett. 35(1), 17–23 (2009). https://doi.org/10.1007/s11249-009-9438-2
Li, J., Zhang, C., Sun, L., Luo, J.: Analysis of measurement inaccuracy in superlubricity tests. Tribol. Trans. 56(1), 141–147 (2013). https://doi.org/10.1080/10402004.2012.732200
Srivastava, S., Badrinarayanan, S., Mukhedkar, A.J.: X-ray photoelectron spectra of metal complexes of substituted 2,4-pentanediones. Polyhedron. 4(3), 409–414 (1985)
Berman, D., Erdemir, A., Sumant, A.V.: Few layer graphene to reduce wear and friction on sliding steel surfaces. Carbon. 54, 454–459 (2013). https://doi.org/10.1016/j.carbon.2012.11.061
Gao, Y., Ma, L., Luo, J.: Pitted surfaces produced by lactic acid lubrication and their effect on ultra-low friction. Tribol. Lett. (2015). https://doi.org/10.1007/s11249-015-0463-z
Jerome, B.: Surface effects and anchoring in liquid crystals. Rep. Prog. Phys. 54(3), 391 (1991)
Sengupta, A., Herminghaus, S., Bahr, C.: Liquid crystal microfluidics: surface, elastic and viscous interactions at microscales. Liq. Cryst. Rev. 2(2), 73–110 (2014)
Acknowledgements
This work is supported by the National Natural Science Foundation of China (Grant No. 51575285), Shandong Provincial Natural Science Foundation, China (Grant Nos. ZR2016EEP15, ZR2017LEE014), and Shandong Provincial Science and Technology Development Project, China (Grant Nos. 2017GGX30118, 2017GGX30136).
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Chen, H., Xu, C., Xiao, G. et al. Ultralow Friction Between Steel Surfaces Achieved by Lubricating with Liquid Crystal After a Running-in Process with Acetylacetone. Tribol Lett 66, 68 (2018). https://doi.org/10.1007/s11249-018-1020-3
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DOI: https://doi.org/10.1007/s11249-018-1020-3