Structural and Magnetic Properties of CoFe2O4 Nanoparticles Synthesized by Starch-Assisted Sol–Gel Auto-Combustion Method in Air, Argon, Nitrogen and Vacuum Atmospheres

Yadav, Raghvendra Singh; Havlica, Jaromír; Ptáček, Petr; Kuřitka, Ivo; Kožáková, Zuzana; Palou, Martin; Bartoníčková, Eva; Boháč, Martin; Frajkorová, Františka; Másilko, Jiří; Zmrzlý, Martin; Hajdúchová, Miroslava; Enev, Vojtěch

doi:10.1007/s10948-014-2854-z

Cited by 11 publications

(6 citation statements)

References 72 publications

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“…This process involves identifying a goal (e.g., mood repair) and then selecting strategies from the available repertoire, implementing those strategies, and monitoring outcomes to inform future predictions and guide behavior (Gross, 2015). Strategies that are rewarded (because they accomplish desired AR functions) become increasingly likely, whereas those that are punished become less likely, and when behaviors are accompanied by affective inputs, reinforcement learning is potentiated (Marinier, Laird, & Marinier III, 2008). Thus, hedonic consequences of maladaptive behavior may serve as potent reinforcement.…”

Section: Goal-directed Maladaptive Behaviormentioning

confidence: 99%

Maladaptive behavior and affect regulation: A functionalist perspective.

Swerdlow¹,

Pearlstein²,

Sandel³

et al. 2020

Emotion

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Clinical science has benefited tremendously from taking seriously the proposition that putatively maladaptive behaviors serve psychological functions, prominently among these affect regulation (AR). These functionalist accounts have not only advanced basic clinical science, but also formed the bedrock for the development of effective treatments. Drawing heavily on reinforcement learning theory, we aim to elucidate functional relationships between maladaptive behavior and affect regulation. Specifically, we take the view that maladaptive behaviors are frequently motivated and reinforced by hedonic AR functions (i.e., decreasing negative affect and increasing positive affect), but are also susceptible to becoming stimulus-bound habits. We review empirical evidence from one such behavior, non-suicidal self-injury (NSSI). We close with a brief reflection on future directions.

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Section: Goal-directed Maladaptive Behaviormentioning

confidence: 99%

Maladaptive behavior and affect regulation: A functionalist perspective.

Swerdlow¹,

Pearlstein²,

Sandel³

et al. 2020

Emotion

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“…A usual synthetic technique for preparation of magnetic CoFe 2 O 4 nanoparticles is the co-precipitation method [1,2,3,4,5,6,7,8,9,10,11,12,13], but also hydrothermal [14,15,16,17], sol-gel auto-combustion [18,19], and microwave assisted [20,21] methods can be applied.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel

et al. 2018

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Nanoparticles with controllable sizes of ferrite spinel CoFe2O4 were formed by thermal treatment of cobalt-iron glycerolate. Thermal behavior during the heating was studied by differential thermal analysis combined with thermogravimetry. The precursor, as well as the prepared nanoparticles, were analyzed by a broad spectrum of analytic techniques (X-Ray photoelectron spectroscopy (XPS), X-Ray diffraction (XRD), Energy dispersive spectroscopy (EDS), Atomic absorption spectroscopy (AAS), Scanning electron microscopy (SEM), and Raman spectroscopy). The particle size of nanoparticles was obtained from Transmission electron microscopy and also calculated using Scherrer formula. A vibrating sample magnetometer (VSM) in a Physical Property Measurement System was used to analyze the magnetic properties of nanoparticles.

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“…The structure of Mn x Zn 1‐ x Fe 2 O 4 ( x =0.2, 0.4, 0.6, 0.8 and 1) nanoferrites were analyzed by FTIR as shown in Figure 3 The two absorption bands ν 1 at around 560 cm −1 , ν 2 at around 420 cm −1 were observed, which matched well with the characteristic peak of spinel ferrite structure. The absorption bands ν 1 were attributed to the intrinsic vibration of tetrahedral complexes (Mn−O or/and Zn−O), and the absorption bands ν 2 were attributed to the intrinsic vibration of octahedral sited metal ion [42] . As can be seen from Figure 3 the absorption bands ν 1 was red shifted with the enhancement of Mn 2+ ions concentration.…”

Section: Resultsmentioning

confidence: 84%

“…The absorption bands ν 1 were attributed to the intrinsic vibration of tetrahedral complexes (MnÀ O or/and ZnÀ O), and the absorption bands ν 2 were attributed to the intrinsic vibration of octahedral sited metal ion. [42] As can be seen from Figure 3 the absorption bands ν 1 was red shifted with the enhancement of Mn 2 + ions concentration. This may be due to the fact that after the largesized Mn 2 + ions substituted with small-sized Zn 2 + ions, the bond length of tetrahedral sites (Table 3) decreased, and the frequency of vibration varied inversely with the bond length.…”

Section: Ftir Spectroscopymentioning

confidence: 72%

Composition Dependent Structural and Magnetic Properties of Mn−Zn Ferrite

Ding

2020

ChemistrySelect

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To reveal the intrinsic mechanism of MnxZn1‐xFe2O4 (x=0.2, 0.4, 0.6, 0.8 and 1) nanoferrite with various content of Mn/Zn are prepared by hydrothermal method. The physical properties are characterized by X‐ray diffraction (XRD), Fourier transformed infrared spectrometer (FTIR), Transmission electronic microscope (TEM), Energy Dispersion Spectrum (EDS) and Vibrating Sample Magnetometer (VSM). The phase structure, lattice parameters, and magnetic properties have been investigated based on the entire cation distribution with enhancement of the Mn2+. The XRD and FTIR analysis indicate that the samples have cubic spinel ferrite structure, the lattice constant at and crystallite size D increase with enhancement of Mn content. The VSM plots demonstrate that the Mn0.6Zn0.4Fe2O4 sample has the largest saturation magnetization value (77 emu/g). These results indicate that a fine tuning of Mn2+ content can adjust the micro‐structure and magnetic properties of MnxZn1‐xFe2O4.

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Structural and Magnetic Properties of CoFe2O4 Nanoparticles Synthesized by Starch-Assisted Sol–Gel Auto-Combustion Method in Air, Argon, Nitrogen and Vacuum Atmospheres

Cited by 11 publications

References 72 publications

Maladaptive behavior and affect regulation: A functionalist perspective.

Maladaptive behavior and affect regulation: A functionalist perspective.

Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel

Composition Dependent Structural and Magnetic Properties of Mn−Zn Ferrite

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