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ABSTRACT
Biodiesel is an environmental friendly alternative fuel for petroleum diesel (PD). It can also be used as blend component with PD. In the present study, the ultrasonic absorption of cotton seed oil methyl esters (CSOME) and palm stearin methyl esters (PSME) biodiesels and their blends with PD have been measured and analyzed as a function of fatty acid profiles of biodiesels. The CSOME that are rich in unsaturated fatty acid methyl esters (FAME) have shown more absorption than PSME which are rich in saturated FAME as there is difference in the structures of saturated and unsaturated fatty acids. The reason for the absorption may be due to the molecular relaxation phenomenon of methyl ester molecules. The ultrasonic absorption may be more in blends than in pure oils.