Experimental Investigation of Nanoparticle Sedimentation in Nano-Enhanced Natural Ester Insulating Fluids Using Acoustic Spectroscopy

Natural and synthetic esters are increasingly being considered as alternative fluids to the widely used mineral oil. For use in electrical equipment, they must provide at least equivalent resistance to electrical breakdown phenomena as the established properties of mineral oil. A relatively recent field of study involves the development of nano-enhanced insulating fluids. These fluids typically consist of nanometer-sized particles dispersed in a base fluid, forming colloidal suspensions. However, a significant challenge associated with these fluids is their lack of long-term stability. This article experimentally study the process of sedimentation of nanoparticles of colloidal suspensions, which are formed by TiO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and SiO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> nanoparticles in natural ester. The methods of acoustic spectroscopy are used for determination of time of sedimentation of nanoparticles in colloidal suspensions at selected temperature.