▎ 摘　　要

NOVELTY - Heat transfer oil-based monobasic- or dibasic-nanofluids comprise either 0.01-0.6 wt% carbon nanotubes or graphene, and 99.4-99.99 wt.% organic synthetic heat transfer oil or mineral oil; or 0.01-0.6 wt.% carbon nanotubes, 0.01-0.6 wt.% graphene and 98.8-99.98 wt.% organic synthetic thermal oil or mineral oil. USE - The nano-fluid is useful in high power devices, and high heat load transfer devices. ADVANTAGE - The nano-fluids exhibits high thermal conductivity, good thermal stability, wide operating temperature range, and low viscosity better than pure thermal oil. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the nanofluids, comprising (i) pre-treating carbon nanotubes and graphene to remove oxygen functional groups from the surface, placing in a muffle furnace, and heating at 450-500 degrees C, maintaining the temperature for 0.5-2 hours, taking out, and naturally cooling to room temperature under atmospheric air conditions; (ii) washing the treated carbon nanotubes and graphene with dilute hydrochloric acid, deionized water and acetone many times to remove ash, metal oxide catalyst, metal ions or grease; (iii) filtering, and centrifugally separating carbon nanotubes and graphene, separating the clear liquid; (iv) heating the carbon nanotubes and graphene by placing in oven under vacuum conditions at 100-110 degrees C for 0.5-1.5 hours; and (v) drying carbon nanotubes or graphene, and ultrasonically dispersing in organic synthetic heat transfer oil or mineral oil, and obtaining 0.01-0.6 wt.% carbon nanotubes or graphene nano-fluids, or drying carbon nanotubes or graphene, and ultrasonically dispersing the dried carbon nanotubes or graphene in organic synthetic heat transfer oil or mineral oil to obtain a binary nanofluids-containing 0.01-0.6 wt.% graphene and carbon nanotubes.