Thermomagnetic determination of Fe3O4 magnetic nanoparticle diameters for biomedical applications

Plouffe, Brian D.; Nagesha, Dattatri; DiPietro, Robert S.; Sridhar, Srinvas; Heiman, D.; Murthy, Shashi K.; Lewis, Lewis H.

doi:10.1016/j.jmmm.2011.04.013

Cited by 26 publications

(12 citation statements)

References 54 publications

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“…Figure 5c and d shows the temperature dependence of the magnetic moment M(T) for the top and the bottom NPs under an applied magnetic field (H ext = 400 Oe) after zero-field cooling (ZFC) and after field cooling (FC). The feature of the ZFC-FC curves confirmed that both the top and the bottom NPs are superparamagnetic in their nature with the blocking temperatures T B at around 135 K and bifurcation temperature T bf (temperature where the ZFC and FC curves split) around 220-230 K. According to Plouffe et al [75], a broad peak on ZFC curve indicates a presence of wide particle size distributions of NPs. The top and bottom NPs have almost similar T B and T bf , which indicates their similar magnetic ordering at low temperature and superparamagnetic behavior above 135 K [76].…”

Section: Morphology Phase Composition and Magnetic Properties Of Npsmentioning

confidence: 58%

Application of iron-based magnetic nanoparticles stabilized with triethanolammonium oleate for theranostics

et al. 2022

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The novel iron-oxide nanoparticles (NPs) stabilized with triethanolammonium oleate were produced. The specimens were divided into two groups: the top NPs (extracted from the supernatant) and the bottom NPs (nanoparticles sedimented at the bottom of the flask during centrifugation), respectively. The XRD and Mössbauer studies revealed a presence of the Fe3O4 phase in both types of nanoparticles. Furthermore, the formation of maghemite layer on the surface of nanoparticles was observed. Average particle sizes determined from TEM and XRD studies were lower than the superparamagnetic limit for the magnetite NPs. For glycerol dispersions of both types of NPs, when exposed to 100 kHz external magnetic field, a significant heat release was observed. Furthermore, the contrasts of T1- and T2-weighted MR images were significantly dependent on the concentration of NPs in their water solutions. Additionally, the reductions of the relaxation times were different for the top and the bottom NPs. The viability studies of the colon cancer cells have shown low cytotoxicity of both types of NPs due to their coating with triethanolammonium oleate, which confirm the possibility to apply the NPs for MRI-guided hyperthermia. Moreover, the presence of NPs did not cause greatest increase of the number of apoptotic cells in the human dermal fibroblasts’ culture and has stimulated proliferation of those cells, revealing great potential of the NPs in regenerative medicine. Graphical abstract

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Section: Morphology Phase Composition and Magnetic Properties Of Npsmentioning

confidence: 58%

Application of iron-based magnetic nanoparticles stabilized with triethanolammonium oleate for theranostics

et al. 2022

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“…The resultant will be a distribution in T Bvalue. The distribution of particle size and magnetic anisotropy is explained by thermomagnetic plots in earlier reports [20][21][22]. The T B -value also depends on the magnetic field used for FC-ZFC mode and the measurement time.…”

Section: Structural and Magnetic Properties Of Spinel Ferrites Nanopamentioning

confidence: 80%

Manganese-Zinc Spinel Ferrite Nanoparticles and Ferrofluids

Singh¹,

Thirupathi²

2017

Magnetic Spinels - Synthesis, Properties and Applications

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The nanoparticles and ferrofluids of spinel ferrites are useful in bio-sensors, transducers, storage devices, optical devices, and so on. The Mn-Zn ferrite (MZF) is generalized soft spinel ferrite having high saturation magnetization at low applied magnetic field. This chapter covers the synthesis of nanoparticles of various sizes and compositions of Mn 1-x Zn x Fe 2 O 4 with x = 0-1 by co-precipitation method. The structural and magnetic properties of the nanoparticles are discussed. The ferrofluids of superparamagnetic and ferromagnetic MZF nanoparticles were synthesized. The magneto-viscosity of ferrofluids with the dispersion of nanoparticles in different colloidal was studied. The Herschel-Bulkley model is applied to analyse the data for low viscosity ferrofluids.

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“…The peak with broad maximum at $85 K indicates the presence of small particles. Using the standard Neel relaxation model, 16 KV ¼ 25 k B T B and the known value of magnetic anisotropy K ¼ 2.7 Â 10 6 erg/cm 3 for bulk Co, 17 the value of average particle diameter as obtained from the m ZFC (T) data is $6 nm. In 25.2% sample, the second peak at $285 K in the m ZFC (T) curve indicates the presence of large particles, which are unblocked at 300 K and hence are still superparamagnetic in nature at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

Kumar

Chaudhary

Pandya

2015

Journal of Applied Physics

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Thermomagnetic determination of Fe3O4 magnetic nanoparticle diameters for biomedical applications

Cited by 26 publications

References 54 publications

Application of iron-based magnetic nanoparticles stabilized with triethanolammonium oleate for theranostics

Application of iron-based magnetic nanoparticles stabilized with triethanolammonium oleate for theranostics

Manganese-Zinc Spinel Ferrite Nanoparticles and Ferrofluids

Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

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