Abstract

Nano-sized hematite (α-Fe2O3) is not well suited for magnetic heating via an alternating magnetic field (AMF) because it is not superparamagnetic—at its best, it is weakly ferromagnetic. However, manipulating the magnetic properties of nano-sized hematite (i.e., magnetic saturation (Ms), magnetic remanence (Mr), and coercivity (Hc)) can make them useful for nanomedicine (i.e., magnetic hyperthermia) and nanoelectronics (i.e., data storage). Herein we study the effects of size, shape, and crystallinity on hematite nanoparticles to experimentally determine the most crucial variable leading to enhancing the radio frequency (RF) heating properties. We present the synthesis, characterization, and magnetic behavior to determine the structure–property relationship between hematite nano-magnetism and RF heating. Increasing particle shape anisotropy had the largest effect on the specific adsorption rate (SAR) producing SAR values more than 6 × greater than the nanospheres (i.e., 45.6 ± 3 W/g of α-Fe2O3 nanorods vs. 6.89 W/g of α-Fe2O3 nanospheres), indicating α-Fe2O3 nanorods can be useful for magnetic hyperthermia.

Details

Title
Nano-structural effects on Hematite (α-Fe2O3) nanoparticle radiofrequency heating
Author
Powell, Camilah D 1 ; Lounsbury, Amanda W 2 ; Fishman, Zachary S 3 ; Coonrod, Christian L 1 ; Gallagher, Miranda J 4 ; Villagran Dino 5 ; Zimmerman, Julie B 6 ; Pfefferle, Lisa D 3 ; Wong, Michael S 7   VIAFID ORCID Logo 

1  Rice University, Chemical and Biomolecular Engineering, Houston, USA (GRID:grid.21940.3e) (ISNI:0000 0004 1936 8278); Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Houston, TX, USA (GRID:grid.21940.3e) 
2  Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Houston, TX, USA (GRID:grid.21940.3e); Yale University, Chemical and Environmental Engineering, New Haven, USA (GRID:grid.47100.32) (ISNI:0000000419368710) 
3  Yale University, Chemical and Environmental Engineering, New Haven, USA (GRID:grid.47100.32) (ISNI:0000000419368710) 
4  Chemistry, Rice University, Houston, USA (GRID:grid.21940.3e) (ISNI:0000 0004 1936 8278) 
5  Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Houston, TX, USA (GRID:grid.21940.3e); Chemistry, University of Texas At El Paso, El Paso, USA (GRID:grid.267324.6) (ISNI:0000 0001 0668 0420) 
6  Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Houston, TX, USA (GRID:grid.267324.6); Yale University, Chemical and Environmental Engineering, New Haven, USA (GRID:grid.47100.32) (ISNI:0000000419368710) 
7  Rice University, Chemical and Biomolecular Engineering, Houston, USA (GRID:grid.21940.3e) (ISNI:0000 0004 1936 8278); Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Houston, TX, USA (GRID:grid.21940.3e); Rice University, Civil and Environmental Engineering, Houston, USA (GRID:grid.21940.3e) (ISNI:0000 0004 1936 8278); Chemistry, Rice University, Houston, USA (GRID:grid.21940.3e) (ISNI:0000 0004 1936 8278); Material Science and NanoEngineering, Rice University, Houston, USA (GRID:grid.21940.3e) (ISNI:0000 0004 1936 8278) 
Publication year
2021
Publication date
Mar 2021
Publisher
Springer Nature B.V.
e-ISSN
21965404
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1186/s40580-021-00258-7
ProQuest document ID
2498797149
Copyright
© The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.