Comparative study of ferromagnetic behaviour in bare and PMMA modified manganese ferrite (MnFe2O4) nanoparticles

2021 ◽  
Author(s):  
Shabnam Dan ◽  
Jishnu Naskar ◽  
Suantak Kamsonlian ◽  
Amit Chattree
Keyword(s):  
Comparative Study ◽  
Manganese Ferrite ◽  
Ferromagnetic Behaviour ◽  
Mnfe2o4 Nanoparticles

scholarly journals Synthesis, Characterization and in Vitro Evaluation of Manganese Ferrite (MnFe2O4) Nanoparticles for Their Biocompatibility with Murine Breast Cancer Cells (4T1)

Molecules ◽  
2016 ◽  
Vol 21 (3) ◽  
pp. 312 ◽  
Author(s):  
Samikannu kanagesan ◽  
Sidek Aziz ◽  
Mansor Hashim ◽  
Ismayadi Ismail ◽  
Subramani Tamilselvan ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cancer Cells ◽  
Breast Cancer Cells ◽  
Manganese Ferrite ◽  
In Vitro Evaluation ◽  
Mnfe2o4 Nanoparticles

scholarly journals Manganese Ferrite Nanoparticles (MnFe2O4): Size Dependence for Hyperthermia and Negative/Positive Contrast Enhancement in MRI

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2297
Author(s):  
Khairul Islam ◽  
Manjurul Haque ◽  
Arup Kumar ◽  
Amitra Hoq ◽  
Fahmeed Hyder ◽  
...  
Keyword(s):  
Colloidal Suspension ◽  
Positive Contrast ◽  
Structural Features ◽  
Maximum Temperature ◽  
Manganese Ferrite ◽  
Field Exposure ◽  
Co Precipitation ◽  
Mnfe2o4 Nanoparticles

We synthesized manganese ferrite (MnFe2O4) nanoparticles of different sizes by varying pH during chemical co-precipitation procedure and modified their surfaces with polysaccharide chitosan (CS) to investigate characteristics of hyperthermia and magnetic resonance imaging (MRI). Structural features were analyzed by X-ray diffraction (XRD), high-resolution transmission electron microscopy (TEM), selected area diffraction (SAED) patterns, and Mössbauer spectroscopy to confirm the formation of superparamagnetic MnFe2O4 nanoparticles with a size range of 5–15 nm for pH of 9–12. The hydrodynamic sizes of nanoparticles were less than 250 nm with a polydispersity index of 0.3, whereas the zeta potentials were higher than 30 mV to ensure electrostatic repulsion for stable colloidal suspension. MRI properties at 7T demonstrated that transverse relaxation (T2) doubled as the size of CS-coated MnFe2O4 nanoparticles tripled in vitro. However, longitudinal relaxation (T1) was strongest for the smallest CS-coated MnFe2O4 nanoparticles, as revealed by in vivo positive contrast MRI angiography. Cytotoxicity assay on HeLa cells showed CS-coated MnFe2O4 nanoparticles is viable regardless of ambient pH, whereas hyperthermia studies revealed that both the maximum temperature and specific loss power obtained by alternating magnetic field exposure depended on nanoparticle size and concentration. Overall, these results reveal the exciting potential of CS-coated MnFe2O4 nanoparticles in MRI and hyperthermia studies for biomedical research.

scholarly journals Manganese ferrite graphene nanocomposite synthesis and the investigation of its antibacterial properties for water treatment purposes

2020 ◽  
Vol 15 (4) ◽  
pp. 1
Author(s):  
Lara De Souza Soletti ◽  
Maria Eliana Camargo Ferreira ◽  
Alex Toshio Kassada ◽  
Benício Alves de Abreu Filho ◽  
Rosangela Bergamasco ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Antibacterial Activity ◽  
Water Treatment ◽  
Graphene Nanosheets ◽  
Antibacterial Properties ◽  
Morphological Characteristics ◽  
Manganese Ferrite ◽  
Transmission Electron ◽  
Cutting Effect ◽  
Mnfe2o4 Nanoparticles

The main objective of this study was to synthesize a nanocomposite using graphene and manganese ferrite nanoparticles (MnFe2O4-G) and to evaluate its antibacterial activity for water treatment purposes. Its morphological characteristics were evaluated by instrumental techniques, such as scanning electron microscopy and transmission electron microscopy. The characterization results indicated that the nanocomposite presented nanoparticles of approximately 25 nm well dispersed in transparent and large (14 μm) graphene nanosheets. The antibacterial activity was evaluated in a batch experiment using a concentration of 40 μg mL-1 of nanocomposite (MnFe2O4-G, bare MnFe2O4 nanoparticles or graphene oxide), 1x105 CFU mL-1 of Escherichia coli, and 8 h of contact time at room temperature. The highest antibacterial capacity was observed for the hybrid nanocomposite (91.91%), due to the synergic effect of graphene and MnFe2O4 nanoparticles. Various mechanisms were proposed to explain the effective antibacterial activity of MnFe2O4-G, such as wrapping, oxidative stress, sharp-edge cutting effect, among others. The results showed that MnFe2O4-G is a potential alternative in water treatment processes as an antibacterial agent.

Water oxidation catalysis by using nano-manganese ferrite supported 1D-(tunnelled), 2D-(layered) and 3D-(spinel) manganese oxides

2016 ◽  
Vol 4 (22) ◽  
pp. 8812-8821 ◽  
Author(s):  
Gökhan Elmacı ◽  
Carolin E. Frey ◽  
Philipp Kurz ◽  
Birgül Zümreoğlu-Karan
Keyword(s):  
Iron Oxide ◽  
Comparative Study ◽  
Iron Oxide Nanoparticles ◽  
Water Oxidation ◽  
Manganese Oxides ◽  
Oxidation Catalysis ◽  
Oxide Nanoparticles ◽  
Manganese Ferrite ◽  
Water Oxidation Catalysis ◽  
2D And 3D

A first comparative study on 1D-, 2D- and 3D-manganese oxides supported by iron oxide nanoparticles for use as water oxidation catalysts is presented.

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