▎ 摘　　要

NOVELTY - High temperature stable nano fluid comprises nano-fluid black liquid by modified graphene nano particles and the ionic liquid, modified graphene nano particles which dispersed in the ionic liquid. USE - The nano fluid is useful for solar thermal utilization technology (claimed). ADVANTAGE - The nano fluid: has good high temperature stability, high coefficient of heat conductivity and good photothermal conversion performance . DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing high temperature stable nano fluid comprising adding modified graphene nano particles into ionic liquid, stirring and dispersing uniformly, to obtain the product.