2022
DOI: 10.1016/j.jmmm.2022.169241
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Improvement of the thermal stability of nanomaghemite by functionalization with type 5A zeolite and magnetic properties studied by in-field 57Fe Mössbauer measurements

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Cited by 11 publications
(10 citation statements)
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“…In general, this oxidation that leads from Fe 3 O 4 to γ-Fe 2 O 3 can occur in the first 2 weeks at which the NPs were synthesized and usually occurs first at the surface. 8,9,14, 20,35,38 In our work, we were able to detect the initial Fe 3 O 4 phase by Raman microscopy because this method was applied immediately after the sample synthesis. In addition, the surface oxidation of the assynthetized Fe 3 O 4 NPs was monitored by the after-burning protocol when the γ → α transformation has occurred, yielding a gradual formation first of the γ-Fe 2 O 3 phase, which obviously started at the surface, and finally the α-Fe 2 O 3 , as also found in the literature.…”
Section: ■ Introductionmentioning
confidence: 89%
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“…In general, this oxidation that leads from Fe 3 O 4 to γ-Fe 2 O 3 can occur in the first 2 weeks at which the NPs were synthesized and usually occurs first at the surface. 8,9,14, 20,35,38 In our work, we were able to detect the initial Fe 3 O 4 phase by Raman microscopy because this method was applied immediately after the sample synthesis. In addition, the surface oxidation of the assynthetized Fe 3 O 4 NPs was monitored by the after-burning protocol when the γ → α transformation has occurred, yielding a gradual formation first of the γ-Fe 2 O 3 phase, which obviously started at the surface, and finally the α-Fe 2 O 3 , as also found in the literature.…”
Section: ■ Introductionmentioning
confidence: 89%
“…However, low-temperature Mössbauer measurements (e.g., below 20 K) can be suitable to differentiate the contribution from either Fe 3 O 4 or γ-Fe 2 O 3 NPs. We must also highlight that the initial state of the iron oxide by co-precipitation is usually Fe 3 O 4 , but several scientific reports have shown that a simple air exposition of the Fe 3 O 4 NPs can cause total oxidation of the surface without additional chemical treatment. ,,,,, The oxidation effect can be due to the high surface chemical reactivity, and it is really important for applications in nanoremediation processes because the surface adsorption depends on Fe 2+ and Fe 3+ coordination and, of course, the adsorption efficiency can be severely affected depending of the phase found in the sample. In general, this oxidation that leads from Fe 3 O 4 to γ-Fe 2 O 3 can occur in the first 2 weeks at which the NPs were synthesized and usually occurs first at the surface. ,,,,, In our work, we were able to detect the initial Fe 3 O 4 phase by Raman microscopy because this method was applied immediately after the sample synthesis.…”
Section: Raman Tem Stem and Saed Analysismentioning
confidence: 99%
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“…It was found that MFs are extremely promising materials for practical applications, such as magnetic fluid seals, magnetic lubricants, visualization systems for the structure of constant magnetic fields and the domain structure of magnetics, magnetically controlled light filters, hydromechanical transducers, sound emitters and spintronic devices, etc. [5][6][7].…”
Section: Introductionmentioning
confidence: 99%