▎ 摘　　要

NOVELTY - Preparing graphene oxide- ferrous oxide magnetic liquid-cement complex material comprises (i) preparing graphene oxide powder, Portland cement, tetrasiloxane quaternary ammonium chloride salt, 25% tetramethylammonium hydroxide solution, dimethyl silicone oil, distilled water, analytical pure ferrous chloride, analytical pure ferric chloride, 98% hydrochloric acid and 1% aqueous ammonia, (ii) obtaining a stable ferrous oxide magnetic liquid, (iii) disposing the graphene oxide dispersant, adding the tetrasiloxane quaternary ammonium chloride salt and dimethyl silicone oil into a glass beaker, stirring, making the tetrasiloxane quaternary ammonium chloride salt and dimethicone into a uniform phase, adding water, stirring, placing the mixture on an emulsifier and emulsifying at 3000-3500 revolutions/minute for 15-18 minutes to obtain a graphene oxide dispersant, (iv) obtaining graphene oxide dispersion and (v) preparing cement-based complex material. USE - The method is useful for preparing graphene oxide- ferrous oxide magnetic liquid-cement complex material. DETAILED DESCRIPTION - Preparing graphene oxide- ferrous oxide magnetic liquid-cement complex material comprises (i) preparing graphene oxide powder, Portland cement, tetrasiloxane quaternary ammonium chloride salt, 25% tetramethylammonium hydroxide solution, dimethyl silicone oil, distilled water, analytical pure ferrous chloride, analytical pure ferric chloride, 98% hydrochloric acid and 1% aqueous ammonia, (ii) mixing ferrous chloride and ferric chloride in a mass ratio of 1:2, dissolving the obtained mixture in distilled water in a mass ratio of 1:5, stirring until a brown solution is formed, adding ferrous and ferric ion into the brown solution, adding 1% hydrochloric acid solution, stirring for 2-2.5 minutes, allowing to stand at room temperature for 6-8 hours, dropping 1% aqueous ammonia into the obtained solution to observe the formation of a brownish black precipitate, adding ammonia until the pH of the solution is 9.2-9.8, carrying out precipitation separation, obtaining ferrous oxide particles, adding ferrous oxide particles into a surfactant of 25% tetramethylammonium hydroxide in a mass ratio of 1:10, ultrasonically shaking for 20-25 minutes to suspend the particles in a liquid medium, allowing to cool to room temperature, taking out the insoluble particles, repeating the ultrasonic vibration until the precipitated particles are not present in the solution and obtaining a stable ferrous oxide magnetic liquid, (iii) disposing the graphene oxide dispersant, where the mass ratio of tetrasiloxane quaternary ammonium chloride salt, dimethyl silicone oil and deionized water is 5:1:15, adding the tetrasiloxane quaternary ammonium chloride salt and dimethyl silicone oil into a glass beaker, stirring for 2-2.5 minutes, making the tetrasiloxane quaternary ammonium chloride salt and dimethicone into a uniform phase, adding water, stirring for 15-18 minutes, placing the mixture on an emulsifier and emulsifying at 3000-3500 revolutions/minute for 15-18 minutes to obtain a graphene oxide dispersant, (iv) mixing the graphene oxide and graphene oxide dispersant in a mass ratio of 1:1.5, stirring for 15-18 minutes to obtain a graphene oxide suspension and (v) adding the Portland cement and ferrous oxide magnetic fluid into the planetary ball mill for 300-320 minutes according to the above ratio, preparing ferrous oxide magnetic fluid and cement, mixing uniformly in the pulp mixer, adding water, stirring for 3-3.5 minutes, adding graphene oxide suspension, stirring for 1-1.5 minutes, injecting the slurry after the stirring into the mold, pressing at 300-350 MPa for 10-15 minutes, pressing the test piece and forming, unloading, immersing the mold in water for 24 hours, taking out the mold, obtaining the graphene oxide- ferrous oxide magnetic liquid-water-based complex material for 28 days by water-immersion curing under normal temperature conditions, where the mass ratio of the silicate cement, graphene oxide suspension, ferrous oxide magnetic fluid and water is 10:1:1:4. An INDEPENDENT CLAIM is also included for the graphene oxide- ferrous oxide magnetic liquid-cement complex material is obtained by the above mentioned method.