▎ 摘　　要

NOVELTY - Method for preparation of hybrid nano-fluid dispersion, involves (a) sonicating a mixture of carboxyl graphene particles and graphene oxide particles in an organic liquid to obtain a first suspension comprising hybridized nanoparticles suspended in the organic liquid, where the hybridized nanoparticles comprise carboxyl graphene nanoparticles modified with graphene oxide nanoparticles, and the organic liquid is a glycol, (b) drying the first suspension to obtain dried hybridized nanoparticles, (c) sonicating the dried hybridized nanoparticles in a coolant to obtain a hybrid nano-fluid slurry, where the weight ratio of the dried hybridized nanoparticles to volume of coolant is 1:1.5-1:4.4 g/l, and (d) dispersing the hybrid nano-fluid slurry in the coolant to obtain the product, where the volume ratio of coolant to hybrid nano-fluid slurry is 14:1-16:1. USE - The method is useful for preparation of hybrid nano-fluid dispersion in cooling applications, such as cooling radiators. ADVANTAGE - The dispersion improves heat conduction properties of the fluid, improves engine operation conditions, increases engine performance, and remains in a stable suspension for long period of time. The method ensures reduced particle size and increased interparticle distance, maintains platelet geometry to improve thermal conductivity of the hybridized nano particles so formed, and is used to evaluate the heat transfer and flow characteristics of the dispersion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the hybrid nano-fluid dispersion comprising a coolant and hybridized nanoparticles comprising carboxyl graphene nanoparticles modified with graphene oxide nanoparticles, where the hybridized nanoparticles have a particle size of 400-600 nm and are dispersed in a weight ratio of the dried hybridized nanoparticles to volume of coolant of 1:20-1:80.