Rezumat
CZU 621.315.61, 544.77, 677.042.22
DOI https://doi.org/10.52577/eom.2026.62.2.70
In this paper, the studies of the stability of nanofluids based on the transformer oil with the addition of titanium dioxide particles are described. Experimental procedures were established to determine the optimal ultrasonic dispersion power and surfactant concentrations. The sedimentation stability of the suspensions formulated with fresh versus service-aged transformer oil was compared. It was found that the nanoparticles exhibited an enhanced stability in the service-aged oil even in the absence of stabilizing agents. A theoretical explanation is proposed, attributing that phenomenon to the variation in the dispersion medium acidity and the displacement of the system relative to the nanoparticles isoelectric point.
Keywords: transformer oil, stability, adsorption, nanofluid, surfactants, zeta-potentia.