Superparamagnetic Nanocomposites Based on the Dispersion of Oleic Acid-Stabilized Magnetite Nanoparticles in a Diglycidylether of Bisphenol A-Based Epoxy Matrix: Magnetic Hyperthermia and Shape Memory
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Superparamagnetic nanocomposites were obtained by dispersion of oleic acid (OA)-coated magnetite NPs in an epoxy system based on diglycidylether of bisphenol A (DGEBA) modified with OA. Dispersion of conventional oleic acid-stabilized magnetite NPs in a typical epoxy matrix is not possible due to the dissimilar chemical structures of the organic coating and the reactive solvent. However, by modification of a DGEBA-based epoxy with 20 wt % OA, we obtained a suitable reactive solvent to disperse up to at least 8 wt % of OA-stabilized magnetite NPs. A tertiary amine was used to catalyze the epoxy–acid reaction and initiate the homopolymerization of the epoxy excess. Both reactions occurred practically in series, first the epoxy–acid and then the epoxy homopolymerization. It was necessary to complete the first reaction to attain a very good dispersion of magnetite NPs in the reactive solvent previous to the occurrence of the final reaction. Magnetization curves and TEM images revealed a uniform dispersion of individual nanoparticles in the cross-linked epoxy. A sample containing 8 wt % OA-coated magnetite NPs exhibited a temperature increase of 25 °C at its surface when exposed to an alternating magnetic field. The temperature increase was enough to induce the shape memory effect of the nanocomposite.
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Puig et al. modified the raw chemical of shape memory epoxy diglycidylether of bisphenol A with 20 wt% oleic acid; the content of the oleic acid-coated magnetite nanoparticles could be increased from under 1 wt% to 8 wt% after the chemical modification of the epoxy.
“Puig et al. [394] modified the raw chemical of shape memory epoxy diglycidylether of bisphenol A with 20 wt% oleic acid.The content of the oleic acid-coated magnetite nanoparticles could be increased from under 1 wt% to 8 wt% after the chemical modification of the epoxy.”
From A review of stimuli-responsive shape memory polymer composites (2013) · cites this paper as [394]
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- Authors
- Puig, J., Hoppe, C. E., Fasce, L. A., Pérez, C. J., Piñeiro-Redondo, Y., Bañobre-López, M., López-Quintela, M. A., Rivas, J., & Williams, R. J. J.
- Affiliations
- Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
- Applied Physics Department, Physics Faculty, (USC), Rúa Xosé María Suárez Núñez, s/n, Campus Vida E-15782, Santiago de Compostela, Spain
- International Iberian Nanotechnology Laboratory (INL), Avenida Mestre José Veiga, 4715-330 Braga, Portugal
- Universidade de Santiago de Compostela (ES)
- International Iberian Nanotechnology Laboratory (PT)
- Corresponding author
- Hoppe, C. E.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-06-07
- Volume
- 116
- Issue
- 24
- Pages
- 13421-13428
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2326824817
- Cited by
- 81
- References
- 38
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 7 · 2019: 7 · 2018: 9 · 2017: 6 · 2016: 10 · 2015: 9 · 2014: 13 · 2013: 5
- FWCI
- 4.92
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- cc-by-nc-sa
- Locations
- The Journal of Physical Chemistry C (publishedVersion)
- Conicet (publishedVersion, cc-by-nc-sa)
- Funders
- European Regional Development Fund
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Characterization and Applications of Magnetic Nanoparticles
- Physical Sciences › Materials Science › Materials Chemistry › Magnetic Properties and Synthesis of Ferrites
- Physical Sciences › Engineering › Mechanical Engineering › Epoxy Resin Curing Processes
- Keywords
- superparamagnetic nanocomposites, Fe3O4 nanoparticles, oleic acid coating, diglycidylether of bisphenol A, epoxy matrix, magnetic hyperthermia, shape memory effect, nanoparticle dispersion, tertiary amine catalysis, alternating magnetic field
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