Monitoring of Superparamagnetic Particle Sizes in the Langevin Law Regime
Joint Authors
Henrard, Daniel
Vuong, Quoc Lam
Delangre, Sébastien
Valentini, Xavier
Gonon, Maurice François
Gossuin, Yves
Nonclercq, Denis
Source
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-11-19
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
In this work, aqueous solutions of magnetite nanoparticles (NPs) are studied.
Magnetite NPs are very useful in biomedicine for magnetic resonance imaging (MRI), for drug delivery therapy, and also for hyperthermia.
In order to predict the NP efficiency in these applications, it is crucial to accurately characterize their size distribution and their magnetization.
Magnetometry, through the dependence of NP magnetization on the magnetic induction (MB curve), can provide interesting information on these physical properties.
In this work, the extraction of the NP size distribution and magnetization from experimental MB curves of aqueous solutions of magnetite NPs is discussed.
The results are compared to TEM and XRD characterizations.
It is shown that an expression taking into account the size distribution better fits the results than the commonly used simple Langevin function.
The size distributions obtained by magnetometry seem comparable to those obtained by TEM measurements.
However, a closer look at the results shows some nonnegligible discrepancies: the size distributions obtained by magnetometry vary with the temperature and are closer to the TEM ones at room temperature.
Our study suggests that it could be explained by the nonnegligible anisotropy energy of the NPs at low temperature and the lack of NP Brownian rotation below the freezing point of water.
This demonstrates that care must be taken when interpreting the results obtained by magnetometry of magnetite NPs: only the size and size distribution obtained at room temperature should be used.
American Psychological Association (APA)
Henrard, Daniel& Vuong, Quoc Lam& Delangre, Sébastien& Valentini, Xavier& Nonclercq, Denis& Gonon, Maurice François…[et al.]. 2019. Monitoring of Superparamagnetic Particle Sizes in the Langevin Law Regime. Journal of Nanomaterials،Vol. 2019, no. 2019, pp.1-9.
https://search.emarefa.net/detail/BIM-1182764
Modern Language Association (MLA)
Henrard, Daniel…[et al.]. Monitoring of Superparamagnetic Particle Sizes in the Langevin Law Regime. Journal of Nanomaterials No. 2019 (2019), pp.1-9.
https://search.emarefa.net/detail/BIM-1182764
American Medical Association (AMA)
Henrard, Daniel& Vuong, Quoc Lam& Delangre, Sébastien& Valentini, Xavier& Nonclercq, Denis& Gonon, Maurice François…[et al.]. Monitoring of Superparamagnetic Particle Sizes in the Langevin Law Regime. Journal of Nanomaterials. 2019. Vol. 2019, no. 2019, pp.1-9.
https://search.emarefa.net/detail/BIM-1182764
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1182764