Online lubricant degradation monitoring using contact charging of polymers

Date
2022-05-15
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Source Title
Applied Surface Science
Print ISSN
0169-4332
Electronic ISSN
1873-5584
Publisher
Elsevier
Volume
584
Issue
Pages
1 - 9
Language
English
Type
Article
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Abstract

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.

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Keywords
Atomic force microscopy, Contact electrification, Lubricants, Polymer tribology, Triboelectricity
Citation
Published Version (Please cite this version)