▎ 摘　　要

NOVELTY - Preparing an oil-soluble iron(II,III) oxide/modified graphene oxide composite material involves: (A) mixing an aqueous solution of graphene oxide with an aqueous solution containing trivalent iron and divalent iron under alkaline conditions, and then performing a heating reaction to obtain iron(II,III) oxide/graphene oxide composite material; and (B) mixing the iron(II,III) oxide/graphene oxide composite material with an alkylamine chosen from tridecanamine, tetradecylamine, hexadecylamine, octadecylamine and/or diisotridecylamine. USE - The method is useful for preparing oil-soluble iron(II,III) oxide/modified graphene oxide composite material, which is useful as a thermally conductive additive in a phase change material (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the oil-soluble iron(II,III) oxide/modified graphene oxide composite material prepared by the above method.