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oai:riubu.ubu.es:10259/110992025-11-26T01:05:33Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

PEGylated carbon black as lubricant nanoadditive with enhanced dispersion stability and tribological performance Ruiz Fernández, Virginia Yate, Luis Langer, Judith Kosta, Ivet Grande, Hans J. Tena Zaera, Ramón Carbon black PEGylation Lubricant nanoadditives High dispersibility Lubricantes Lubrication and lubricants Poly(ethylene glycol) (PEG) chains were covalently grafted onto carbon black (CB) using a PEG-terminated trimethoxysilane, yielding PEGylated CB additives (CB-SiPEG) with different SiPEG contents. Unlike pristine CB, CB-SiPEG was readily dispersed in PEG200 base oil, with CB-SiPEG hydrodynamic particle sizes being considerably smaller than those of pristine CB. At optimal SiPEG content, friction coefficient and specific wear rate in ball-on-disk tribometer tests were reduced by 35% and 67% respectively, with 1% wt. CB-SiPEG compared to PEG200 alone. In contrast, pristine CB, alone or with unbound SiPEG, did not show friction-reducing or antiwear capacity. Disk analysis supports CB-SiPEG surface deposition forming a protective tribofilm. Hydrodynamic particle size and lubricating performance of CB-SiPEG/PEG200 blends were preserved after 6 months, indicating high dispersion stability. Financial support from Diputación Foral de Gipuzkoa (OIL project, ref. 188/2017) is gratefully acknowledged. 2025-11-25T11:36:48Z 2025-11-25T11:36:48Z 2019-09 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 0301-679X https://hdl.handle.net/10259/11099 10.1016/j.triboint.2019.05.001 eng Tribology International. 2018, V. 137, p. 228-235 https://doi.org/10.1016/j.triboint.2019.05.001 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier https://riubu.ubu.es/bitstream/10259/11099/4/Ruiz-Tribol_Int_2019.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by-nc-nd/4.0/ RIUBU. Repositorio Institucional de la Universidad de Burgos https://hdl.handle.net/10259/11099