▎ 摘　　要

NOVELTY - Preparation of graphene iron (II, III) oxide (Fe3O4) composite organic magnetic rheological liquid comprises preparing stable Fe3O4 organic magnetic liquid; and adding cellulose or hydroxyethyl cellulose or ethyl cellulose and imidazole 1-(2-cyanethyl)-2-ethyl-4-methyl imidazole or 1-(2-cyanethyl)-2-ethyl-2-methyl imidazole to the organic solvent, adding expanded graphite, ultrasonically dispersing graphene in organic solution to obtain the graphene Fe3O4 composite organic magnetic rheological liquid. USE - Method for preparing graphene Fe3O4 composite organic magnetic rheological liquid (claimed). ADVANTAGE - The method has good stability, low zero field viscosity, shear strain, and wide temperature range. DETAILED DESCRIPTION - Preparation of graphene Fe3O4 composite organic magnetic rheological liquid comprises: (A) dissolving 3.0-4.5 g iron (II) chloride tetrahydrate and 5.8-8 g iron (III) chloride hexahydrate in 90 ml deionized water, placing in 50 degrees C constant temperature water bath, stirring uniformly, violent stirring at 500 revolutions/minute (rpm) for 1-3 drops/second, slowly dripping 80-100 ml sodium hydroxide solution of 1.34 mol/l, continuous reacting for 80-95 minutes, cooling at room temperature, using the reaction liquid magnetic separation, removing upper layer clear liquid, and adding the obtained Fe3O4 black particle with organic solvent acetone or tetrahydrofuran without water or ethanol or acetonitrile, stirring at 400 rpm, and ultrasonic dispersing for 5 minutes, magnetic separating, removing upper layer clear liquid, dispersing the organic solvent with ultrasonic, magnetic separating, repeatedly washing 5 times, magnetic separation after obtaining Fe3O4 magnetic nanoparticle, taking the organic solvent, magnetic separating the Fe3O4 magnetic nanoparticle and stirring at 400 rpm, and ultrasonic dispersing for 30 minutes, using ultrasonic liquid at 2000 rpm, centrifuging for 1 minute, taking upper layer liquid having a concentration of 10-50 mg/ml to obtain the stable Fe3O4 magnetic organic liquid; and (B) adding cellulose or hydroxyethyl cellulose or ethyl cellulose and imidazole 1-(2-cyan ethyl)-2-ethyl-4-methyl imidazole or 1-(2-cyan ethyl)-2-ethyl-2-methyl imidazole to the organic solvent to prepare homogeneous solution, expanding, adding graphite to the homogeneous solution, expanding to obtain graphite concentration for dispersing solution at 10 mg/ml, ultrasonic dispersing for 3-13 hours, expanding graphite form graphene dispersion liquid, dispersing the solution at 4000 rpm, taking upper layer liquid to obtain stable graphene and organic solution, using cellulose or imidazole for expanding the graphite; taking Fe3O4 organic magnetic liquid and non-ionic surfactant and adding stable graphene organic solution at 400 rpm, stirring for 20-60 minutes, adding organic base carrier liquid silicone oil or mineral oil or hydraulic oil or diester organic liquid, stirring at 80-100 degrees C, further ultrasonic later, to obtain stable graphene/Fe3O4 composite organic magnetic rheological fluid, and expanding using graphite and Fe3O4 at a ratio of 1:19-3:2.