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Organic Molecular Glues to Design Three-Dimensional Cubic Nano-assemblies of Magnetic Nanoparticles.

Mohammad Suman ChowdhuryDaniel Arenas EstebanRabia AminClaudia Román-FreijeiroEnja Laureen RöschMarkus EtzkornMeinhard SchillingFrank LudwigDries van ThourhoutVerónica SalgueiriñoAidin Lak
Published in: Chemistry of materials : a publication of the American Chemical Society (2024)
Self-assembled magnetic nanoparticles offer next-generation materials that allow harnessing of their physicochemical properties for many applications. However, how three-dimensional nanoassemblies of magnetic nanoparticles can be synthesized in one-pot synthesis without excessive postsynthesis processes is still a bottleneck. Here, we propose a panel of small organic molecules that glue nanoparticle crystallites during the growth of particles to form large nanoassembled nanoparticles (NANs). We find that both carbonyl and carboxyl functional groups, presenting in benzaldehyde and benzoic acid, respectively, are needed to anchor with metal ions, while aromatic rings are needed to create NANs through π-π stacking. When benzyl alcohol, lacking carbonyl and carboxyl groups, is employed, no NANs are formed. NANs formed by benzoic acid reveal a unique combination of high magnetization and coercivity, whereas NANs formed by benzaldehyde show the largest exchange bias reported in nanoparticles. Surprisingly, our NANs show unconventional colloidal stability due to their unique nanoporous architectures.
Keyphrases
  • magnetic nanoparticles
  • water soluble
  • case report
  • artificial intelligence
  • metal organic framework