Tribology Letters

, 64:8 | Cite as

Neutralization Mechanism of Acetic Acid by Overbased Colloidal Nanoparticles

  • Yufei Duan
  • Riccardo Rausa
  • Qi Zhao
  • Kyriakos D. PapadopoulosEmail author
Original Paper


The neutralization reaction mechanism of acetic acid by fully formulated lubricant oil is discussed in this paper. The video analysis of acetic-acid droplets in oil phase indicates that neutralization exists simultaneously on the oil–acid interface and bulk oil phase during the droplet shrinkage. This behavior is different from the one exhibited by sulfuric acid, which is insoluble in base oil and its neutralization by overbased lubricant occurs exclusively at the oil–acid interface. Besides, FTIR and NMR analyses show the neutralization of acetic acid as an instantaneous process, and almost all of the dissolved acetic acids in the bulk are eventually neutralized. Therefore, a two-mode-mechanism, including both interfacial and bulk reaction, is proposed for the neutralization of acetic acid by overbased nanoparticles. At the end, tribological behavior of sulfuric acid and acetic-acid neutralization products is discussed.


Reaction mechanism Overbased detergent Acetic acid Neutralization Video microscopy 



The authors are grateful to Marco Lattuada, of Eni S.p.A., for the preparation of the fully formulated oil sample and for the helpful discussions. Support from Eni S.p.A. and Tulane’s Department of Chemical & Biomolecular Engineering made this work possible.

Supplementary material

11249_2016_742_MOESM1_ESM.docx (988 kb)
Supplementary material 1 (DOCX 988 kb)

Supplementary material 2 (AVI 5232 kb)

Supplementary material 3 (AVI 7726 kb)

Supplementary material 4 (AVI 10428 kb)

Supplementary material 5 (AVI 19002 kb)


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Yufei Duan
    • 1
  • Riccardo Rausa
    • 2
  • Qi Zhao
    • 3
  • Kyriakos D. Papadopoulos
    • 1
    Email author
  1. 1.Department of Chemical and Biomolecular EngineeringTulane UniversityNew OrleansUSA
  2. 2.Eni S.p.A. Upstream and Technical ServicesSan Donato Milanese Research CenterSan Donato MilaneseItaly
  3. 3.Department of ChemistryTulane UniversityNew OrleansUSA

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