The abstract is longer than the introduction. The abstract should length should be around 150-250 words and give essential and concise information on the article, outlining the main results achieved. It should avoid details on the processing of the materials used, unless a specific study on the influence of the processing route has been carried out and corresponding results are presented in the paper. Moreover, the novelty of the study is completely missing; 2) In abstract “electrical property” should be replaced with “dielectric properties”; 3) In abstract please replace “AC breakdown property” with AC breakdown voltage; 4) In section 1 (Introduction) the state of the art is completely missing; 5) In section 2.1 (Mineral oil-based nanofluid preparation) more details on the material employed should be given, such as type of mineral oil used, type of nanomaterials employed (e.g., commercially available or synthesized by the authors); 6)