Lock-in thermography as a rapid and reproducible thermal characterization method for magnetic nanoparticles

Lemal, Philipp; Geers, Christoph; Monnier, Christophe; Crippa, Federica; Daum, Leopold; Urban, Dominic A.; Rothen‐Rutishauser, Barbara; Bonmarin, Mathias; Petri‐Fink, Alke; Moore, Thomas L.

doi:10.1016/j.jmmm.2016.11.012

Cited by 9 publications

(26 citation statements)

References 30 publications

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“…51 We recently proposed the use of lock-in thermal imaging (LIT) instead. 47,52 In this technique, the amplitude of the magnetic field is harmonically modulated at a defined frequency, while the resulting sample temperature is processed according to the digital lock-in principle. 46 Because of the averaging nature of the technique, this approach allows high sensitivity.…”

Section: Theoretical Basismentioning

confidence: 99%

Lock-In Thermography as an Analytical Tool for Magnetic Nanoparticles: Measuring Heating Power and Magnetic Fields

et al. 2017

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Magnetic nanoparticles and their ability to convert electromagnetic energy into heat are of explicit interest for various applications. However, precise quantification of their heating efficiency is not always upfront, and several parameters render comparative studies challenging. This paper describes the theory behind lock-in thermography, a new technique for quantifying the heating properties of magnetic nanoparticles. This technique allows the investigation of some of the potential sources of variability: key factors such as magnetic field inhomogeneity and its effects on the heating power are explored in detail. The presented results, obtained from various nanoparticle batches of different origins, highlight the importance of pursuing a standardized and systematic approach when quantifying the heating efficiency of magnetic nanoparticles.

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Section: Theoretical Basismentioning

confidence: 99%

Lock-In Thermography as an Analytical Tool for Magnetic Nanoparticles: Measuring Heating Power and Magnetic Fields

et al. 2017

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“…The method rejects slowly varying artifacts due to its averaging nature and significantly improves the signal‐to‐noise ratio . Previous studies have shown that LIT is a promising tool for the detection and characterization of superparamagnetic NPs in an alternating magnetic field or light‐stimulated polydopamine NPs . These studies were performed under quasi‐adiabatic conditions, and influences of evaporation or undesired phase transformations could be neglected due to the low amount of generated thermal energy .…”

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confidence: 99%

Lock‐In Thermography to Analyze Plasmonic Nanoparticle Dispersions

Steinmetz

Taladriz‐Blanco

Geers

et al. 2019

Part & Part Syst Charact

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The physicochemical properties of nanoparticles (NPs) strongly rely on their colloidal stability, and any given dispersion can display remarkably different features, depending on whether it contains single particles or clusters. Thus, developing efficient experimental methods that are able to provide accurate and reproducible measures of the NP properties is a considerable challenge for both research and industrial development. By analyzing different NPs, through size and concentration, it is demonstrated that lock‐in thermography, based on light absorption and heat generation, is able to detect and differentiate the distinct aggregation and re‐dispersion behavior of plasmonic NPs, e.g., gold and silver. Most importantly, the approach is nonintrusive and potentially highly cost‐effective compared to standard analytical techniques.

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“…This behaviour was only partially observable for the cubes, where the Catechol-PEG 5 kDa show a significant decrease in SAR to CA coated cubes, while Catechol-PEG 2 kDa and Catechol-PVA 5 kDa are not significantly different. These small changes might be attributed to the overall lower SAR values of the cubes due to their smaller size [12].…”

Section: Resultsmentioning

confidence: 99%

“…The iron content of CA coated SPIONs was analysed according to a procedure published elsewhere [12] using a PerkinElmer Avio 200 inductively coupled plasma optical emission spectroscopy (ICP-OES). Diluted samples of CA-coated cubic and spherical SPIONs were prepared for transmission electron microscopy (TEM) by a reported procedure [30].…”

Section: Particle Analysismentioning

confidence: 99%

“…In short, Brownian relaxation describes the complete rotation of the entire particle towards the direction of the applied external magnetic field and generates heat via rotational friction [8], while in Néel relaxation only the magnetic moment inside the particles follows the magnetic field direction and the magnetic energy is dissipated as heat [7]. The efficiency of this conversion is dictated by external parameters including magnetic field frequency [9] and amplitude [10], as well as by several intrinsic particle properties, such as crystallinity [11], surface coating [6], polydispersity index [12], colloidal stability [13], and size [14]. In addition, the latter factor, particle size, determines to a large extent the effective relaxation mechanism [7,14].…”

Section: Introductionmentioning

confidence: 99%

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Simple and fast evaluation of relaxation parameters of magnetic nanoparticles

Lemal

Balog

Ackermann-Hirschi

et al. 2020

Journal of Magnetism and Magnetic Materials

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The efficacy of magnetic hyperthermia treatment depends on the optimal available magnetic nanoparticles (MNPs) that are excited in a given alternating magnetic field and viscosity of the region of interest. In this regard, assessing the relevant relaxation parameters is of upmost importance and could improve the speed of development of efficient applications. Here, we demonstrate how to deduce all relevant magnetic parameters from fast, independent, and simple experimental measurements such as dynamic light scattering, vibrating sample magnetometer, and lock-in thermography. We study the thermal behaviour of two MNPs with different forms, i.e. spherical and cubical, synthesized in-house by thermal decomposition and coated with 4 different surface agents. By determination of specific absorption rate (SAR) values, hydrodynamic diameters and M−H curves it is possible to compute the magnetic particle volume, dominant relaxation time and magnetocrystalline anisotropy constant. The calculated SAR values derived from these parameters, show good agreement with the experimental determined SAR data, demonstrating the applicability of the reported procedure. Additionally, our results indicate that surface coatings can have minor impacts on the thermal dissipation of Néel relaxation dominated MNPs.

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Lock-in thermography as a rapid and reproducible thermal characterization method for magnetic nanoparticles

Cited by 9 publications

References 30 publications

Lock-In Thermography as an Analytical Tool for Magnetic Nanoparticles: Measuring Heating Power and Magnetic Fields

Lock-In Thermography as an Analytical Tool for Magnetic Nanoparticles: Measuring Heating Power and Magnetic Fields

Lock‐In Thermography to Analyze Plasmonic Nanoparticle Dispersions

Simple and fast evaluation of relaxation parameters of magnetic nanoparticles

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