Oleylamine, 80-90% (cis-1-Amino-9-octadecene, 80-90%) is a multifunctional reagent used for metal ion coordination and nanoparticle surface modification, and acts as a solvent, surfactant and reducing agent in the synthesis of metal oxide nanoparticles. Oleylamine, 80-90% regulates nanoparticle morphology, magnetization intensity and water proton relaxation rate via thiol-ene click reaction, and enhances the colloidal stability of nanoparticles in organic reagents. Oleylamine, 80-90% is mainly used in research and applications in fields such as nanomaterial synthesis, biomedical imaging (MRI contrast agents, fluorescent probes), cancer cell targeting and drug delivery[1][2][3].