IKBFU's Vestnik

2020 Issue №4

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Expansion of the arsenal of physical research methods of liquid dielectric examples exotic types of vegetable oils



Research topic: the applicability of an external feature — electret-thermal analysis — to the study of liquid dielectrics, which are exotic types of edible vegetable oils.

The purpose of scientific research: to establish the relationship of the cur­rent response with heating of oil samples with their fatty acid composi­tion.

Description of the research methodology: for the analysis of samples of vegetable oils (pumpkin, walnuts, black cumin), the method of electret-thermal analysis, that is widely used in condensed matter physics, was ap­plied. When this method is implemented, during the heating of samples, a current response to the physicochemical changes occurring in them is rec­orded, which is compared with the fatty acid oils composition.

The main results, conclusions of the research work: based on the exist­ence of a non-zero current response, a hypothesis is put forward that ther­mally stimulated and accompanied by the flow of current destruction of un­stable supramolecular formations — associates of fatty acid triglycerides — occur in the samples. It has been established that the spectrum type of the thermally stimulated current is in obvious accordance with the fact which triglycerides of which specific fatty acids prevail in the composition of a par­ticular oil. A change in the current spectrum in comparison with the char­acteristic spectrum for this oil type can be considered a marker of damage or falsification.