Online lubricant degradation monitoring using contact charging of polymers

Azimet A. Karluk, Sunay D. Ekim, Bilge Baytekin, H. Tarik Baytekin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Lubrication of machine parts is necessary to prevent friction and wear in machine operation. However, oxidation of lubricants upon operation changes their chemical and physical properties and causes lubrication performance to deteriorate. Besides, one liter of wasted/used lubricant oil can contaminate a million liters of water. Current methods for the timely detection of oil deterioration lack practicality. Here we show simple, a triboelectrification-based method for oil degradation monitoring, in which the oxidation can be monitored by the changes in the contact charging (and separation) signals of oil-dipped cellulose and a common polymer tapped to each other. The commercial and base oil samples are oxidized at 100–200 °C for up to 80 h, simultaneously monitored by ATR-FTIR and the triboelectric method. The results show that a 40–90% decrease in the triboelectric open-circuit potentials in the presence of oxidized oil can directly indicate the start of oil oxidation without other accompanying analyses.

Original languageEnglish (US)
Article number152593
JournalApplied Surface Science
StatePublished - May 15 2022

Bibliographical note

Funding Information:
This work was financially supported by the TÜBİTAK, National Natural Science Foundation of Turkey (grant nos. 115 M744).

Publisher Copyright:
© 2022


  • Atomic force microscopy
  • Contact electrification
  • Lubricants
  • Polymer tribology
  • Triboelectricity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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