Adsorption behavior of heat modified soybean oil via boundary lubrication coefficient of friction measurements

Brajendra K. Sharma, Sevim Z. Erham, Girma Biresaw

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The frictional behaviors of soybean oil and heat modified soybean oils with different Gardner scale viscosities as additives in hexadecane have been examined in a boundary lubrication test regime (steel contacts) using Langmuir adsorption model. The free energy of adsorption (ΔGads) of various heat modified soybean oils were compared with unmodified soybean oil. It was observed, that relative distribution of unsaturation in the molecule, average molecular weight and thus viscosity can affect adsorption on the metal surface. Heat modified soybean oils consistently have a lower ΔG ads values compared to unmodified soybean oil. Lower ΔG ads corresponds to stronger adsorption on the metal surface. The heat modification thus provides oils with stronger adsorption and higher viscosities, good for use in industrial lubricant formulations. This information can be used to design suitable lubricant molecules that will have optimum structure for effective metal adsorption as well as exhibit excellent boundary lubrication properties.

Original languageEnglish (US)
Title of host publication2008 Proceedings of the STLE/ASME International Joint Tribology Conference, IJTC 2008
Pages245-247
Number of pages3
StatePublished - Oct 16 2009
Externally publishedYes
Event2008 STLE/ASME International Joint Tribology Conference, IJTC 2008 - Miami, FL, United States
Duration: Oct 20 2008Oct 22 2008

Publication series

Name2008 Proceedings of the STLE/ASME International Joint Tribology Conference, IJTC 2008

Other

Other2008 STLE/ASME International Joint Tribology Conference, IJTC 2008
CountryUnited States
CityMiami, FL
Period10/20/0810/22/08

Keywords

  • Boundary lubrication
  • Coefficient of friction
  • Free energy of adsorption
  • Vegetable oils

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology
  • Mechanical Engineering

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  • Cite this

    Sharma, B. K., Erham, S. Z., & Biresaw, G. (2009). Adsorption behavior of heat modified soybean oil via boundary lubrication coefficient of friction measurements. In 2008 Proceedings of the STLE/ASME International Joint Tribology Conference, IJTC 2008 (pp. 245-247). (2008 Proceedings of the STLE/ASME International Joint Tribology Conference, IJTC 2008).