TY - GEN
T1 - Adsorption behavior of heat modified soybean oil via boundary lubrication coefficient of friction measurements
AU - Sharma, Brajendra K.
AU - Erham, Sevim Z.
AU - Biresaw, Girma
PY - 2009/10/16
Y1 - 2009/10/16
N2 - 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.
AB - 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.
KW - Boundary lubrication
KW - Coefficient of friction
KW - Free energy of adsorption
KW - Vegetable oils
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M3 - Conference contribution
AN - SCOPUS:70349860175
SN - 9780791843369
T3 - 2008 Proceedings of the STLE/ASME International Joint Tribology Conference, IJTC 2008
SP - 245
EP - 247
BT - 2008 Proceedings of the STLE/ASME International Joint Tribology Conference, IJTC 2008
T2 - 2008 STLE/ASME International Joint Tribology Conference, IJTC 2008
Y2 - 20 October 2008 through 22 October 2008
ER -