Superparamagnetic polyacrylamide/magnetite composite gels

Filho, E.D. Silva; Brito, Elvis Lopes; Silva, Rodolfo; Streck, Letícia; Bohn, F.; Fonseca, J. L. C.

doi:10.1080/01932691.2020.1774382

Cited by 14 publications

(6 citation statements)

References 68 publications

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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%

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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Section: Methodssupporting

confidence: 93%

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

Iglesias,

de Araújo,

Xavier

et al. 2021

Preprint

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“…The GO/PAM hydrogel presented a broad non-crystalline diffraction region between 10° and 29°, indicate the successful impregnation of the PAM into the graphite oxide layers. In terms of GO/PAM/Fe 3 O 4 , seven peaks appeared at 2 θ values of 18.4°, 30.2°, 35.7°, 43.4°, 53.8°, 57.2°, and 62.7°, which are characteristic peaks of Fe 3 O 4 , are attributed to the (1 1 1), (2 2 0), (3 1 1), (4 0 0), (4 2 2), (5 1 0), and (4 4 0) planes, respectively ( Filho, Brito, Silva, Streck, Bohn, & Fonseca, 2021 ). However, it must be noted that the sharp characteristic peak of GO (2 θ of 11.4°) did not appear in both GO/PAM and GO/PAM/Fe 3 O 4 nanocomposite which attributed to either the complete exfoliation of GO sheets in the polymer or the partial exfoliation leaving a small amount of crystalline GO.…”

Section: Resultsmentioning

confidence: 99%

Insights into a new alternative method with graphene oxide/polyacrylamide/Fe3O4 nanocomposite for the extraction of six odor-active esters from Strong-aroma types of Baijiu

Lian

Lin

et al. 2022

Food Chemistry: X

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“…When hydrogels loaded with metal ions are transferred to the sodium hydroxide solution, a rapid color change from yellow to black occurs. This indicates the formation of Fe 3 O 4 particles inside the hydrogel [33,34] (Figure 1c).…”

Section: Synthesismentioning

confidence: 89%

Preparation and Characterization of Fe3O4/Poly(HEMA-co-IA) Magnetic Hydrogels for Removal of Methylene Blue from Aqueous Solution

Ludeña,

Meza,

Huamán

et al. 2023

Gels

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In the present study, Fe3O4/poly(2-hydroxyethyl methacrylate-co-itaconic acid) magnetic hydrogels (MHGs) were prepared by in situ synthesis of Fe3O4 magnetic particles in hydrogels (HGs). The resulting magnetic hydrogels were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), a vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), and N2 adsorption–desorption. The effect of Fe3O4 on the swelling behavior and adsorption of methylene blue (MB) dye of the prepared hydrogel was studied. Parameters such as the dose, pH, contact time, and MB initial concentration were investigated. The results show that 75% (HG) and 91% (MHG) of MB (200 mg/L) were removed at doses of 2 mg/mL and 1 mg/mL, respectively, under a pH of 6.8 and a contact time of 10 min. The adsorption behavior followed the Langmuir isotherm model, indicating that the adsorption process takes place in monolayers and on homogeneous surfaces. The Langmuir capacities for MB adsorption using the HGs and MHGs were 78 and 174 mg/g, respectively. The adsorption kinetics followed a pseudo-second-order kinetic model. In addition, thermodynamic studies carried out show that the adsorption process is spontaneous and endothermic. Adsorption–desorption studies indicate that the magnetic hydrogel can remove MB for four cycles with removal efficiencies above 90%. Therefore, a MHG is suitable as an alternative material for MB adsorption.

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Superparamagnetic polyacrylamide/magnetite composite gels

Cited by 14 publications

References 68 publications

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

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

Insights into a new alternative method with graphene oxide/polyacrylamide/Fe3O4 nanocomposite for the extraction of six odor-active esters from Strong-aroma types of Baijiu

Preparation and Characterization of Fe3O4/Poly(HEMA-co-IA) Magnetic Hydrogels for Removal of Methylene Blue from Aqueous Solution

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