Superparamagnetic magnetite/IPEC particles

Brito, Elvis Lopes; Gomes, D.N.; Cid, Cristiani Campos Plá; Araújo, J. C. R. de; Bohn, F.; Streck, Letícia; Fonseca, J. L. C.

doi:10.1016/j.colsurfa.2018.09.067

Cited by 25 publications

(8 citation statements)

References 65 publications

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“…From our concern at this moment, we highlight the ZFC curves are characterized by a broad cusp, whose location of the maximum defined the system blocking temperature, in which the nanoparticles exhibit a magnetic transition between the superparamagnetic and blocked states. For our set, we find blocking temperature values within the range between 135 and 190 K. Similar results are found in literature for both, magnetite 43 , 44 and magnesium ferrite 49 – 53 nanoparticles. In this sense, our samples are superparamagnetic at room temperature.…”

Section: Methodssupporting

confidence: 90%

Magnetic nanoparticles hyperthermia in a non-adiabatic and radiating process

Iglesias

Araújo

Xavier

et al. 2021

Sci Rep

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We investigate the magnetic nanoparticles hyperthermia in a non-adiabatic and radiating process through the calorimetric method. Specifically, we propose a theoretical approach to magnetic hyperthermia from a thermodynamic point of view. To test the robustness of the approach, we perform hyperthermia experiments and analyse the thermal behavior of magnetite and magnesium ferrite magnetic nanoparticles dispersed in water submitted to an alternating magnetic field. From our findings, besides estimating the specific loss power value from a non-adiabatic and radiating process, thus enhancing the accuracy in the determination of this quantity, we provide physical meaning to a parameter found in literature that still remained not fully understood, the effective thermal conductance, and bring to light how it can be obtained from experiment. In addition, we show our approach brings a correction to the estimated experimental results for specific loss power and effective thermal conductance, thus demonstrating the importance of the heat loss rate due to the thermal radiation in magnetic hyperthermia.

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Section: Methodssupporting

confidence: 90%

Magnetic nanoparticles hyperthermia in a non-adiabatic and radiating process

Iglesias

Araújo

Xavier

et al. 2021

Sci Rep

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“…Specifically, diffraction peaks for the magnetite samples are well indexed with the standard pattern ICSD-26410, and can be associated to the (220), (311), (400), (422), (511), (440), (620), (533) planes. These findings are in very good agreement with reports found in the literature [27][28][29] . The results for the magnesium ferrite in turn are in quite-good concordance with ICSD-152468 and with findings previously reported by different groups [30][31][32][33] , presenting peaks located at 2θ ranging from 28 • to 80 • , which are associated with the (220), (311), ( 222), (400), (422), (511), (440), (620) and (533) planes of the MgFe 2 O 4 .…”

Section: Methodssupporting

confidence: 93%

“…From our concern at this moment, we highlight the ZFC curves are characterized by a broad cusp, whose location of the maximum defined the system blocking temperature, in which the nanoparticles exhibit a magnetic transition between the superparamagnetic and blocked states. For our set, we find blocking temperature values within the range between 135 and 190 K. Similar results are found in literature for both, magnetite 27,28 and magnesium ferrite [33][34][35][36][37] nanoparticles. In this sense, our samples are superparamagnetic at room temperature.…”

Section: Methodssupporting

confidence: 90%

Specific loss power of magnetic nanoparticles (fluid) hyperthermia in non-adiabatic conditions

Iglesias,

de Araújo,

Xavier

et al. 2021

Preprint

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We investigate the magnetic nanoparticles (fluid) hyperthermia in non-adiabatic conditions through the calorimetric method. Specifically, we propose a theoretical approach to magnetic hyperthermia from a thermodynamic point of view. To test the robustness of the approach, we perform hyperthermia experiments and analyze the thermal behavior of magnetite and magnesium ferrite magnetic nanoparticles dispersed in water submitted to an alternating magnetic field. From our findings, besides estimating the specific loss power value from a non-adiabatic process, thus enhancing the accuracy in the determination of this quantity, we provide physical meaning to parameters found in literature that still remained not fully understood, and bring to light how they can be obtained experimentally.

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“…Under anaerobic conditions Fe(OH) 2 and Fe(OH) 3 are formed at alkaline pH (pH > 8) by the hydroxylation of ferric and ferrous ions. The magnetite synthesis by coprecipitation is performed as shown in the following equations (Brito 2019;Zayed et al 2016…”

Section: Magnetite and Maghemitementioning

confidence: 99%

Study of heating curves generated by magnetite nanoparticles aiming application in magnetic hyperthermia

Silva

Campos

2020

Braz. J. Chem. Eng.

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Malignant tumors occur by uncontrolled multiplication of the body's cells. Currently, a promising technique, called magnetic hyperthermia, has been intensively researched. The technique makes it possible to interrupt the growth of tumor cells by the localized application of heat from the magnetization/demagnetization of magnetic nanoparticles (the Joule effect). The amount of heat generated depends on the magnetic material and the characteristics of the external magnetic field. In this work, magnetite Fe 3 O 4 particles (core-shell layer type) were synthesized by the wet coprecipitation method and coated with a polymer blend of polyethylene glycol and polyvinylpyrrolidone (PEG/PVP). The nanoparticles were subjected to a magnetic field of intensity equal to 12 kA m −1 and frequency 202 kHz. Under these conditions, specific absorption rate (SAR) values between 15-48 W g −1 were obtained. The heating curves obtained were adjusted with a proposed mathematical model. The adjustments were satisfactory and showed a good correlation coefficient (at an averaged level of 0.99). In addition, hysteresis curves and FTIR spectra were obtained. Keywords Magnetic hyperthermia • Nanoparticles • Magnetite • Mathematical model List of symbols I Electric current, [A] f Frequency, [kHz] t Magnetic field exposure time, [min] ΔT Temperature variation in the hyperthermia assay, [°C]

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Superparamagnetic magnetite/IPEC particles

Cited by 25 publications

References 65 publications

Magnetic nanoparticles hyperthermia in a non-adiabatic and radiating process

Magnetic nanoparticles hyperthermia in a non-adiabatic and radiating process

Specific loss power of magnetic nanoparticles (fluid) hyperthermia in non-adiabatic conditions

Study of heating curves generated by magnetite nanoparticles aiming application in magnetic hyperthermia

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