Impedance spectroscopy is a technique that, together with dielectric spectroscopy, facilitates rapid and non-destructive characterization of biological, mineral and biochemical materials. Organic and inorganic mineral oil is obtained as a by-product of crude oil processing and is a common ingredient in many cosmetic products and commonly used as a lubricant and insulating oil. In the present work, an exhaustive review of the literature on the use of electrical and dielectric impedance spectroscopy applied in the quality control of mineral oils is carried out, since it is a fast and economical technique, in addition, it is possible to use impedance sensors in oil production sites, where, it would be desirable to know the main characteristics for a correct classification of the product. Due to the above, the present review aimed to compile scientific information published between 1992 and 2022, describing the use of electrical and dielectric impedance spectroscopy techniques in the quality control of mineral oils. The review found 40% of articles with a focus on the determination of new applications, 41% on the determination of components and 20% on the stability of the oil, taking into account that the electrical properties and thermal stability of insulating materials are closely related and the electrical properties deteriorate as the thermal stability of the material decreases, several studies have shown that as mineral oil degrades, conductivity increases due to an increase in the concentration of conductive species such as nitric acid (oxidation by-products) and contaminants (e.g. particulate metal wear, water). The results suggest that on-line measurement of oil acidity is an important quality control factor that could be performed in combustion engines as a complement to conventional oil condition monitoring methods (e.g., oil level and pressure monitoring). In summary, electrical properties such as permittivity, impedance and conductivity provide a promising means of assessing the quality of these oils.
Tópico:
Spectroscopy and Chemometric Analyses
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FuenteEncuentro Internacional de Educación en Ingeniería.