▎ 摘　　要

NOVELTY - Quasi two dimensional (2D) nanomaterial comprises amorphous graphene (a-GS) nanosheets having high thermal conductivity of and high electrical insulation. USE - The quasi two dimensional nanomaterial is useful for high performing transformer oils. ADVANTAGE - The quasi two dimensional nanomaterial exhibits unique combination of high thermal conductivity and high electrical insulations at very low filler fractions, enhances (13-31% at 0.005-0.01 wt.% at 55 degrees C) of thermal conductivity at ultra low filler fraction (0.005-0.01 wt.%), enhances electrical properties (enhancement of alternative current breakdown voltage around 18%), and has high electrical resistivity and dielectric constant. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a nanofluid having high electrical insulation and thermal conductivity comprising quasi 2D nanomaterial comprising amorphous graphene nanosheets dispersed in a base medium or matrix to synergistically enhance electrical insulation and thermal conductivity of the base medium or matrix; (2) manufacture of quasi 2D nanomaterial comprising unzipping amorphous carbon nanotubes (a-CNT) by subjecting the same to high power ultrasonication method of size 30 nm x 50 nm including obtaining a homogenous mixture of ferrocene and ammonium chloride by grounding the ferrocene and the ammonium chloride together in a mortar and pestle in a ratio of 1:2, heating the homogenous mixture in an air furnace under a mica cover and then naturally cooling heated homogeneous mixture which provides black powder composed of a-CNT and iron particles formed form the ferrocene, washing the black powder with diluted hydrochloric acid and di-ionized water repeatedly to dissolve away the un-reacted iron and ferrocene and finally dried to obtain pure a-CNT powder, unzipping the a-CNT powder by dispersing a pre-defined quantity of the a-CNT powder into ethanol and ultrasonicating the solution in a high power ultrasonicator for unzipping the amorphous carbon nanotubes, filtering the solution and drying the filtered solution to obtain black residue powder which composed of the a-GS nanosheets, where the process parameter includes precursor ratio and temperature are controlled such as to maintain desired sp2 and sp3 bonded regions of carbon with sp2/sp3 ratio in the ratio of -0.68; and (3) manufacturing nanofluid comprising providing a-GS nanosheets, dispersing amorphous nano sheets thus obtained in base medium or matrix including transformer oil, including involving the prepared a-GS nanosheets based additive and dispersing the same in the transformer base oil at 0.005-0.01 wt.%, ultrasonicating the dispersed solution by probe sonicator with power 200-250 W for 2 hours to prepare the a-GS nanosheets dispersed transformer oil nanofluid.