Influence of crystallite size on the magnetic properties of Fe3O4 nanoparticles

Upadhyay, Sneha; Parekh, Kinnari; Pandey, Brajesh

doi:10.1016/j.jallcom.2016.03.279

Cited by 187 publications

(66 citation statements)

References 20 publications

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“…There is extensive ongoing research into nanoscale magnetically ordered materials sparked by their potential applications in medicine (Pankhurst et al, 2003;Kim et al, 2007), magnetic sensors (Chen et al, 2011;Kennedy et al, 2014), RF components (Chinnasamy et al, 2015), magnetic fluids (Chen et al, 2011), and magnetic memory (Moser et al, 2002). Current research is driven by the fact that the properties of nanoscale ferromagnetic materials can be different from those seen in the bulk (Hendriksen et al, 1993;Batlle and Labarta, 2002;Goya et al, 2003;Upadhyay et al, 2016;Williams et al, 2019). For example, they have been reported to show enhanced coercivities that can be useful for magnetic memory storage devices (Barakat et al, 2009;Dong et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

et al. 2020

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Electrospinning has been used to fabricate ferromagnetic Ni 0. 47Fe 0.53 nanofiber mats that were composed of individual, orientated Ni 0.47 Fe 0.53 nanofibers. The key steps were processing a polyvinylpyrrolidone nanofiber template containing ferric nitrate and nickel acetate metal precursors in Ar at 300 • C and then 95% Ar: 5% H 2 at 600 • C. The Ni 0.47 Fe 0.53 fibers were nanostructured and contained Ni 0.47 Fe 0.53 nanocrystals with average diameters of ∼14 nm. The Ni 0.47 Fe 0.53 ferromagnetic mats had a high saturation magnetic moment per formula unit that was comparable to those reported in other studies of nanostructured Ni 1-x Fe x. There is a small spin-disordered fraction that is typically seen in nanoscale ferromagnets and is likely to be caused by the surface of the nanofibers. There was an additional magnetic contribution that could possibly stem from a small Fe 1-z Ni z O phase fraction surrounding the fibers. The coercivity was found to be enhanced when compared with the bulk material.

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Section: Introductionmentioning

confidence: 99%

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

et al. 2020

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“…Dependent upon atom density, each crystallographic facet contains energetically distinct sites. High atom density at (311) may be associated with high reactivity of these crystalline facets [52]. By the equation, the estimated crystallite size of synthesized Fe 3 O 4 NPs was 83.4 nm, which figured out to be high purity crystalline [53].…”

Section: Xrd Analysismentioning

confidence: 98%

Ultrasound assisted-phytofabricated Fe ₃ O ₄ NPs with antioxidant properties and antibacterial effects on growth, biofilm formation, and spreading ability of multidrug resistant bacteria

Alavi

Karimi

2019

Artificial Cells, Nanomedicine, and Biotechnology

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Complicated issue in infectious illnesses therapy is increasing of multidrug resistant (MDR) bacteria and biofilms in bacterial infections. In this way, emerging of nanotechnology as a new weapon specifically in the cases of metal nanoparticle (MNPs) synthesis and MNPs surface modification has obtained more attention. In this study, ultrasound-assisted green synthesis method was utilized for the preparation of Fe 3 O 4 NPs with novel shape (dendrimer) through leaf aqueous extract of Artemisia haussknechtii Boiss. Ultraviolet-visible spectroscopy, energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), atomic force microscopic (AFM), X-ray diffraction (XRD) techniques were applied for MNPs physicochemical characterization. Also, disc diffusion assay, minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), planktonic and biofilm morphology of three pathogenic bacteria involving Serratia marcescens ATCC 13880, Escherichia coli ATCC 25922, and methicillin-resistant Staphylococcus aureus (MRSA) were evaluated upon treatment of Fe 3 O 4 NPs as antiplanktonic and antibiofilm analysis. Results showed efficient antiplanktonic and antibiofilm activities of biosynthesized Fe 3 O 4 NPs with average diameter size of 83.4 nm. Reduction in biofilm formation of S. aureus ATCC under Fe 3 O 4 NPs stress was significant (66%) in higher MNPs concentration (100 lg/mL). In addition, as first report, spreading ability of S. aureus as important factor in colony expansion on culture medium was reduced by increasing of Fe 3 O 4 NPs. Present study demonstrates striking antiplanktonic, antibiofilm, antispreading mobility and antioxidant aspects of one-pot biosynthesized Fe 3 O 4 NPs with novel shape.

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“…The broadening of XRD peaks was mainly caused by particle/crystallite size and lattice strains other than instrumental broadening. 7 The XRD-derived size is usually bigger than the so-called magnetic size, due to the fact that smaller domains are present in a particle where all moments are aligned in the same direction, even if the particle is single domain. On the contrary, the TEM-deduced size was higher than that calculated using XRD, for samples with very large particles; in fact, when the particle size is bigger than 50 nm, there are more than one crystal boundary on their surface.…”

Section: X-ray-based Techniquesmentioning

confidence: 99%

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

2018

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Nanostructures have attracted huge interest as a rapidly growing class of materials for many applications. Several techniques have been used to characterize the size, crystal structure, elemental composition and a variety of other physical properties of nanoparticles. In several cases, there are physical properties that can be evaluated by more than one technique. Different strengths and limitations of each technique complicate the choice of the most suitable method, while often a combinatorial characterization approach is needed. In addition, given that the significance of nanoparticles in basic research and applications is constantly increasing, it is necessary that researchers from separate fields overcome the challenges in the reproducible and reliable characterization of nanomaterials, after their synthesis and further process (e.g. annealing) stages. The principal objective of this review is to summarize the present knowledge on the use, advances, advantages and weaknesses of a large number of experimental techniques that are available for the characterization of nanoparticles. Different characterization techniques are classified according to the concept/group of the technique used, the information they can provide, or the materials that they are destined for. We describe the main characteristics of the techniques and their operation principles and we give various examples of their use, presenting them in a comparative mode, when possible, in relation to the property studied in each case.

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Influence of crystallite size on the magnetic properties of Fe3O4 nanoparticles

Cited by 187 publications

References 20 publications

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

Ultrasound assisted-phytofabricated Fe ₃ O ₄ NPs with antioxidant properties and antibacterial effects on growth, biofilm formation, and spreading ability of multidrug resistant bacteria

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

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Influence of crystallite size on the magnetic properties of Fe3O4 nanoparticles

Cited by 187 publications

References 20 publications

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

Ultrasound assisted-phytofabricated Fe 3 O 4 NPs with antioxidant properties and antibacterial effects on growth, biofilm formation, and spreading ability of multidrug resistant bacteria

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

Contact Info

Product

Resources

About

Ultrasound assisted-phytofabricated Fe ₃ O ₄ NPs with antioxidant properties and antibacterial effects on growth, biofilm formation, and spreading ability of multidrug resistant bacteria