Phase Transformation of Superparamagnetic Iron Oxide Nanoparticles via Thermal Annealing: Implications for Hyperthermia Applications

Crippa, Federica and Rodriguez-Lorenzo, Laura and Hua, Xiao and Goris, Bart and Bals, Sara and Garitaonandia, José S. and Balog, Sandor and Burnand, David and Hirt, Ann M. and Haeni, Laetitia and Lattuada, Marco and Rothen-Rutishauser, Barbara and Petri-Fink, Alke (2019) Phase Transformation of Superparamagnetic Iron Oxide Nanoparticles via Thermal Annealing: Implications for Hyperthermia Applications. ACS Applied Nano Materials, 2 (7). pp. 4462-4470.

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Abstract

Magnetic hyperthermia has the potential to play an important role in cancer therapy and its efficacy relies on the nanomaterials selected. Superparamagnetic iron oxide nanoparticles (SPIONs) are excellent candidates due to the ability of producing enough heat to kill tumor cells by thermal ablation. However, their heating properties depend strongly on crystalline structure and size, which may not be controlled and tuned during the synthetic process; therefore, a postprocessing is needed. We show how thermal annealing can be simultaneously coupled with ligand exchange to stabilize the SPIONs in polar solvents and to modify their crystal structure, which improves hyperthermia behavior. Using high-resolution transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, vibrating sample magnetometry, and lock-in thermography, we systematically investigate the impact of size and ligand exchange procedure on crystallinity, their magnetism, and heating ability. We describe a valid and simple approach to optimize SPIONs for hyperthermia by carefully controlling the size, colloidal stability, and crystallinity.

Item Type:
Journal Article
Journal or Publication Title:
ACS Applied Nano Materials
Additional Information:
doi: 10.1021/acsanm.9b00823
ID Code:
171428
Deposited By:
Deposited On:
07 Jun 2022 14:25
Refereed?:
Yes
Published?:
Published
Last Modified:
14 Dec 2022 16:15