Abstract

In this investigation, we assessed the stability and physicochemical properties of copper oxide (CuO) nanoparticles dispersed in an Azadirachta indica oil-biodiesel blend (B20). CuO nanopartides were prepared at 75 ppm and the dispersants were added at the same ratio as the CuO nanoparticles. TRITON X, QPAN 80, and TWEEN 80 were used as dispersants. An ultrasonic bath sonicator was used to sonicate the nanoparticles and prepare the nanofuel. In addition, an ultraviolet photospectrometer was used in the stability analysis of the absorption and transmission. The stability analysis was carried out for a period of three weeks. The stability of the CuO nanoparticles increased in B20 when the dispersants were added compared to the base nanoparticles. However, higher absorption and lower permeability were observed in the QPAN-added nanofuels compared to the other samples. In addition, the stability of all of the nanofuel samples slightly decreased at the end of Week 3. For the B20 + CuO75 + Tw75 nanofuel, higher absorbance and lower transmittance values were obtained: 4.08 and 86.09% (Week 1), 4.06 and 88.03% (Week 2), and 4.04 and 92.03% (Week 3), respectively. Moreover, the physicochemical properties, such as the cetane number and heating value of the nanoparticle-added B20, were improved.

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