Polyol synthesis of Mn3+ substituted Fe3O4 nanoparticles: Cation distribution, structural and electrical properties

Amir, Muhammad; Ünal, B.; Shirsath, Sagar E.; Geleri, M.; Sertkol, M.; Baykal, A.

doi:10.1016/j.spmi.2015.07.001

Cited by 31 publications

(6 citation statements)

References 47 publications

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“…In Fig. 1a the diffraction peaks show the reflection planes (111), (202), (311), (222),(400),(333),(404), (440), (533) and (622) which match well with the standard diffraction values of JCPDS file no 74-2403 [26][27][28][29][30]. All these peaks confirm the cubic spinel lattice of MnFe 2 O 4 .…”

Section: Structural Analysissupporting

confidence: 67%

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

Jacintha

Umapathy

Neeraja³

et al. 2017

J Nanostruct Chem

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Nanosized manganese ferrite (MnFe 2 O 4 ) particles were prepared by sol-gel method using natural polymers like wheat flour (WF) and potato flour (PF) as surfactants and its structural, morphological, optical and magnetic characteristics were studied by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), scanning electron microscope (SEM), photoluminescence spectroscopy (PL) and vibration sample magnetometer (VSM). Brunauer-Emmett-Teller (BET) surface area test also performed and the results obtained were discussed. The average crystallite size was found to be 23 and 16 nm for WF/MnFe 2 O 4 and PF/MnFe 2 O 4 samples, respectively. Magnetic hysteresis loops confirmed the super-paramagnetic behavior for both the samples. For oxidation of benzyl alcohol to benzaldehyde, the catalytic activity of MnFe 2 O 4 nanoparticles (NPs) was carried out. Antimicrobial and antifungal activity of WF/MnFe 2 O 4 and PF/MnFe 2 O 4 samples were investigated against two Gram-positive bacteria (Staphylococcus aureus, Streptococcus pneumoniae), two Gram-negative bacteria (Pseudomonas aeruginosa, Salmonella paratyphi) and fungus (Candida albicans) using inhibition zone method. Minimum Inhibitory Concentration (MIC) values also calculated to determine susceptibilities of bacteria to drugs and also to evaluate the activity of new antimicrobial agents. The in vitro cytotoxicity of newly synthesized samples were analyzed by MTT assay against MCF-7, A549 and HaCaT cell lines in a dose-dependent fashion. Among these two samples, sample B (using potato flour) shows better response than sample A (using wheat flour) and both the samples were non-toxic to normal cell line. The concentration required to kill 50% of the cell (IC 50 ) was also calculated. Graphical AbstractMnFe 2 O 4 nanoparticles were synthesized by sol-gel method using natural polymers, wheat flour and potato flour, as surfactant. The as-prepared MnFe 2 O 4 was characterized by XRD, FT-IR, SEM, EDX, PL and VSM analysis. The average crystallite size was found to be 23 and 16 nm for WF/MnFe 2 O 4 and PF/MnFe 2 O 4 samples, respectively. Magnetic hysteresis loops confirmed the super-paramagnetic behavior for both the samples. The catalytic activity of MnFe 2 O 4 nanoparticles (NPs) were carried out for oxidation of benzyl alcohol to benzaldehyde. Biological activities like antimicrobial, antifungal and anticancer activities of the samples were investigated. Among these two samples, PF/MnFe 2 O 4 shows better response than WF/MnFe 2 O 4 and both the samples were non-toxic to normal cell line.

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Section: Structural Analysissupporting

confidence: 67%

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

Jacintha

Umapathy

Neeraja³

et al. 2017

J Nanostruct Chem

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“…The oxygen atoms are arranged in a cubic close packed structure and, in theory, the Co 2+ ions occupy octahedral (A) sites while the Fe 3+ ions occupy the remaining octahedral (A) sites and the tetrahedral (B) sites. However, this is the theoretical cation distribution for an inverse spinel and often, in practice, the cation distribution can be less orderly due to defects ( e.g ., oxygen vacancies) 25,26,44–46 . Indeed, Chen et al .…”

Section: Introductionmentioning

confidence: 99%

Reversible, Electric-Field Induced Magneto-Ionic Control of Magnetism in Mesoporous Cobalt Ferrite Thin Films

Robbennolt

Menéndez

Quintana

et al. 2019

Sci Rep

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The magnetic properties of mesoporous cobalt ferrite films can be largely tuned by the application of an electric field using a liquid dielectric electrolyte. By applying a negative voltage, the cobalt ferrite becomes reduced, leading to an increase in saturation magnetization of 15% ( M S ) and reduction in coercivity ( H C ) between 5–28%, depending on the voltage applied (−10 V to −50 V). These changes are mainly non-volatile so after removal of −10 V M S remains 12% higher (and H C 5% smaller) than the pristine sample. All changes can then be reversed with a positive voltage to recover the initial properties even after the application of −50 V. Similar studies were done on analogous films without induced porosity and the effects were much smaller, underscoring the importance of nanoporosity in our system. The different mechanisms possibly responsible for the observed effects are discussed and we conclude that our observations are compatible with voltage-driven oxygen migration ( i.e ., the magneto-ionic effect).

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“…Thus, our experimental results are well explained on basis of above theory. In addition, it is noteworthy that the nanosize effect and Curie temperature may also contribute to the drop of saturation magnetization, especially for samples with high dopant content [ 56 , 59 ]. It is noticed from the previous reports that high concentration of Li 1+ /Zn 2+ doping decreases Curie temperature due to the cationic redistribution (Fe 3+ ) between octahedral and tetrahedral sites [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

et al. 2023

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The vast applicability of spinel cobalt ferrite due to its unique characteristics implies the need for further exploration of its properties. In this regard, structural modification at the O-site of spinel with Li1+/Zn2+ was studied in detail for exploration of the correlation between structural, magnetic, and dielectric properties of the doped derivatives. The CTAB-assisted coprecipitation method was adopted for the synthesis of the desired compositions owing to its cost effectiveness and size controlling ability. Redistribution of cations at T- and O-sites resulted in the expansion of the crystal lattice, but no distortion of the cubic structure was observed, which further supports the flexible crystal structure of spinel for accommodating larger Li1+/Zn2+ cations. Moreover, an XPS analysis confirmed the co-existence of the most stable oxidation states of Zn2+, Li1+, Co2+, and Fe3+ ions with unstable Co3+ and Fe2+ ions as well, which induces the probability of hopping mechanisms to a certain extent and is a well-established behavior of cobalt ferrite nanoparticles. The experimental results showed that Li1+/Zn2+ co-doped samples exhibit the best magnetic properties at dopant concentration x = 0.3. However, increasing the dopant content causes disturbance at both sites, resulting in decreasing magnetic parameters. It is quite evident from the results that dielectric parameters are closely associated with each other. Therefore, dopant content at x = 0.1 is considered the threshold value exhibiting the highest dielectric parameters, whereas any further increase would result in decreasing the dielectric parameters. The reduced dielectric properties and enhanced magnetic properties make the investigated samples a potential candidate for magnetic recording devices.

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Polyol synthesis of Mn3+ substituted Fe3O4 nanoparticles: Cation distribution, structural and electrical properties

Cited by 31 publications

References 47 publications

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

Synthesis and comparative studies of MnFe2O4 nanoparticles with different natural polymers by sol–gel method: structural, morphological, optical, magnetic, catalytic and biological activities

Reversible, Electric-Field Induced Magneto-Ionic Control of Magnetism in Mesoporous Cobalt Ferrite Thin Films

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

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