The Effect of Polyol Composition on the Structural and Magnetic Properties of Magnetite Nanoparticles for Magnetic Particle Hyperthermia

Kotoulas, A.; Dendrinou‐Samara, Catherine; Angelakeris, M.; Kalogirou, Ο.

doi:10.3390/ma12172663

Cited by 24 publications

(15 citation statements)

References 86 publications

(119 reference statements)

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“…However, it has been shown that equivalent NPs (size, shape …) synthesized by different methods often display different magnetic properties [11,[24][25][26][27]. Among the different synthesis methods, the thermal decomposition was demonstrated to be very effective to tune the size, shape and composition of NPs [28], [29].…”

Section: Introductionmentioning

confidence: 99%

Harnessing Composition of Iron Oxide Nanoparticle: Impact of Solvent-Mediated Ligand–Ligand Interaction and Competition between Oxidation and Growth Kinetics

et al. 2020

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The composition of metal oxide nanoparticles is of great importance for their applications because defects and/or deviation from stoechiometry strongly affect their physical properties. We report here on the crucial role of synthesis parameters such as solvent, ligand and iron precursors on the composition of spinel iron oxide nanoparticles synthesized by the thermal decomposition method. At first, the investigation of the thermal decomposition of iron stearates bearing either two or three stearate chains by thermogravimetric analysis, IR spectroscopy and Mössbauer spectrometry as a function of temperature and syntheses with only oleic acid and iron stearate confirmed that the composition of the first nuclei is wüstite Fe 1-x O. The synthesis of nanoparticles with high sizes requires the use of very high boiling point solvents to ensure an effective growth step. We observed that, when the grain growth and oxidation kinetics are similar, nanoparticles with a spinel composition and quite no defects are produced. An oxidation rate slower than the nuclei growth rate favours the formation of core-shell Fe 1-x O@Fe 3-x O 4 NPs. The oxidation kinetics is shown to be influenced by surfactant and solvent natures.Indeed, surfactants such as oleic acid form a dense monolayer at the nuclei surface which oxidation kinetics will depend on this monolayer permeability. Temperature, solvents with high surfactant affinity, deprotonated surfactants or decomposition products of solvents affect the monolayer stability and thus the nanoparticle composition. The solvents' nature and solvent mediated ligand-ligand interactions are thus evidenced to be important parameters to control the formation of defectsfree and stoechiometric oxide nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Harnessing Composition of Iron Oxide Nanoparticle: Impact of Solvent-Mediated Ligand–Ligand Interaction and Competition between Oxidation and Growth Kinetics

et al. 2020

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“…For this study, we consider the case of a colloid with electrosteric stabilisation. The system comprises 50 spherical magnetite nanoparticles with spontaneous magnetisation of Ms= 4.4610 5 A/m, whose sizes have a lognormal distribution, which are dispersed in water whose dynamic viscosity is 8.910 -4 Pas and the relative electrical permittivity is 78.5. The Hamaker constant for magnetite in water is 3910 -20 J [19].…”

Section: Simulation Conditions and Resultsmentioning

confidence: 99%

“…Some of the methods currently used to synthesize these nanoparticles are: the modified sol-gel method used to prepare nanoparticles of nanometric size under supercritical conditions of ethyl alcohol and alkaline co-precipitation, with an additional step of a hydrothermal method or thermal decomposition technique. We mention that the method of obtaining nanoparticles by thermal decomposition of an iron precursor in the presence of NaBH4 in a polyol was found suitable for size control in both chemical approaches [1,5].…”

Section: Introductionmentioning

confidence: 99%

The influence of the magnetic nanoparticles coating from colloidal system on the magnetic relaxation time

Osaci¹,

Cacciola²

2019

Preprint

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Currently, the colloidal systems of monodomain superparamagnetic nanoparticles are used in biomedical applications, such as hyperthermia treatment for cancer. In this type of colloid, called nanofluid, there is a tendency of nanoparticle agglomeration. It has been shown experimentally that the nanoparticle coating plays an important role in the nanoparticle dispersion stability and biocompatibility, which role was theoretically understudied so far. Also, the implications of nanoparticle coating on the magnetic properties of the nanoparticles have been little studied. This paper presents the theoretical study, by numerical simulation, on how the nanoparticle coating affects the tendency of agglomeration of the nanoparticles and the Néel relaxation time – or the effective magnetic relaxation time of the system. For simulating the self-organization of colloidal nanoparticles, we apply a Langevin dynamics stochastic method based on an effective Verlet-type algorithm, and the Néel magnetic relaxation time is assessed through the Coffey method in oblique magnetic field, adapted to the local magnetic field on a nanoparticle.

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“…These methods involve supercritical conditions, such as ethyl alcohol and alkaline co-precipitation, and an additional step in which the hydrothermal method or thermal decomposition technique are used. The method used to obtain nanoparticles by thermal decomposition of an iron precursor in the presence of NaBH 4 in a polyol was found to be suitable for size control in both chemical approaches [1][2][3][4]6].…”

Section: Introductionmentioning

confidence: 99%

Influence of the magnetic nanoparticle coating on the magnetic relaxation time

Osaci¹,

Cacciola²

2020

Beilstein J. Nanotechnol.

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Colloidal systems consisting of monodomain superparamagnetic nanoparticles have been used in biomedical applications, such as the hyperthermia treatment for cancer. In this type of colloid, called a nanofluid, the nanoparticles tend to agglomeration. It has been shown experimentally that the nanoparticle coating plays an important role in the nanoparticle dispersion stability and biocompatibility. However, theoretical studies in this field are lacking. In addition, the ways in which the nanoparticle coating influences the magnetic properties of the nanoparticles are not yet understood. In order to fill in this gap, this study presents a numerical simulation model that elucidates how the nanoparticle coating affects the nanoparticle agglomeration tendency as well as the effective magnetic relaxation time of the system. To simulate the self-organization of the colloidal nanoparticles, a stochastic Langevin dynamics method was applied based on the effective Verlet-type algorithm. The Néel magnetic relaxation time was obtained via the Coffey method in an oblique magnetic field, adapted to the local magnetic field on a nanoparticle.

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The Effect of Polyol Composition on the Structural and Magnetic Properties of Magnetite Nanoparticles for Magnetic Particle Hyperthermia

Cited by 24 publications

References 86 publications

Harnessing Composition of Iron Oxide Nanoparticle: Impact of Solvent-Mediated Ligand–Ligand Interaction and Competition between Oxidation and Growth Kinetics

Harnessing Composition of Iron Oxide Nanoparticle: Impact of Solvent-Mediated Ligand–Ligand Interaction and Competition between Oxidation and Growth Kinetics

The influence of the magnetic nanoparticles coating from colloidal system on the magnetic relaxation time

Influence of the magnetic nanoparticle coating on the magnetic relaxation time

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