Manganese oxide magnetic nanoparticle, preparation method and application thereof
The present invention relates to the technical field of anti-icing materials, and in particular to a manganese ferrite magnetic nanoparticle, preparation method and application thereof. The manganese ferrite magnetic nanoparticle prepared by the present invention is LaxCaySrzMnO3, wherein X=0.1-0.7, Y=0.1-0.35, and Z=0-0.16; and is prepared from the following materials, comprising, in parts by weight: 10-70 parts of lanthanum nitrate, 10-35 parts of calcium nitrate, 2-10 parts of strontium nitrate, and 30-50 parts of manganese nitrate.
1 . A preparation method for a manganese oxide magnetic nanoparticle, wherein the preparation method is a hydrothermal method performed in a hydrothermal autoclave reactor, comprising:
S01: adding the following materials in parts by weight into purified water and stirring to obtain a reaction solution: 30-60 parts of lanthanum nitrate, 10-25 parts of calcium nitrate, 2-5 parts of strontium nitrate, and 30-40 parts of manganese nitrate; adjusting pH of the reaction solution to 8-10, and subjecting the reaction solution to ultrasonic treatment;
S02: transferring the reaction solution obtained in S01 into the hydrothermal autoclave reactor and heating at a temperature of 200-300° C. for 12-24 hours to obtain a reaction product;
S03: processing the reaction product by drying, then annealing at a temperature of 900-1000° C. for 10-15 hours, and grinding to obtain a crude manganese oxide magnetic particle product;
S04: modifying the crude manganese oxide magnetic particle product to obtain the manganese oxide magnetic nanoparticle; wherein the modification comprises a modification with oleic acid and/or fluorosilane; and
wherein the manganese oxide magnetic nanoparticle comprises a manganese oxide having a molecular formula of La x Ca y MnO 3 , wherein X=0.3, and Y=0.1.
2 . The preparation method according to claim 1 , wherein the modification in S04 comprises adding the crude manganese oxide magnetic particle product to an oleic acid solution, adding the crude manganese oxide magnetic particle to a fluorosilane solution, or sequentially adding the crude manganese oxide magnetic particle to an oleic acid solution and then to a fluorosilane solution, followed by stirring at a temperature of 60-90° C.
3 . The preparation method according to claim 1 , wherein the manganese oxide magnetic nanoparticle produced by the modification in S04 has a particle size in the range of 250-300 nm.
4 . A method of preparing a low-Curie-point anti-icing coating, comprising incorporating the manganese oxide magnetic nanoparticle prepared by the preparation method according to claim 1 into a coating composition.