▎ 摘　　要

NOVELTY - Preparing phase conversion material filled with nanographene sheet comprises (a) melting the dried and pre-treated n-octadecane solid, (b) adding nano graphene sheet and ultra-dispersing agent to molten n-octadecane to obtain a mixed suspension, (c) stirring the mixed suspension by a stirrer for mixing uniformly, (d) placing the uniformly mixed suspension in an ultrasonic cleaner, and ultrasonically vibrating to form 3-dimensional heat conductive network structure of the nanographene sheet inside n-octadecane and (e) naturally cooling the suspension obtained in the step (d) for coagulation to obtain composite material having n-octadecene as a matrix. USE - The phase conversion material is useful in the field of energy.