Searching for the nanoscopic–macroscopic boundary

Velásquez, E. A.; Altbir, D.; Mazo-Zuluaga, J.; Duque, Luisa Fernanda; Mejı́a-López, J.

doi:10.1016/j.jmmm.2013.08.029

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…The increase in film thickness also increases the phase transition temperature. These facts are consistent both with the experimental data [ 14 , 15 , 16 ] and with the results of modelling by other methods [ 17 , 18 ]. The film coating coefficient also affects the phase transition temperature.…”

Section: Discussionsupporting

confidence: 91%

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Investigation of Phase Transitions in Ferromagnetic Nanofilms on a Non-Magnetic Substrate by Computer Simulation

Белим

2022

Materials

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Magnetic properties of ferromagnetic nanofilms on non-magnetic substrate are examined by computer simulation. The substrate influence is modeled using the two-dimensional Frenkel-Kontorova potential. The film has a cubic crystal lattice. Cases of different ratio for substrate period and ferromagnetic film period are considered. The difference in film and substrate periods results in film deformations. These deformations result in a change in the magnetic properties of the film. The Ising model and the Metropolis algorithm are used for the study of magnetic properties. The dependence of Curie temperature on film thickness and substrate potential parameters is calculated. Cases of different values for the coverage factor are considered. The deformation of the film layers is reduced away from the substrate when it is compressed or stretched. The Curie temperature increases when the substrate is compressed and decreases when the substrate is stretched. This pattern is performed for films with different thicknesses. If the coating coefficient for the film is different from one, periodic structures with an increased or reduced concentration of atoms are formed in the film first layer. These structures are absent in higher layers.

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Section: Discussionsupporting

confidence: 91%

“…We can expect a more complex dependence for magnetic properties when deforming a substrate for films with a thickness of more than one layer. Curie temperature depends on film thickness at any substrate [ 17 , 18 ]. The non-magnetic substrate interacts only with the film atoms at the boundary of their contact.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Phase Transitions in Ferromagnetic Nanofilms on a Non-Magnetic Substrate by Computer Simulation

Белим

2022

Materials

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“…The most significant characteristic of nanoparticles is that the chemical, physical and biological properties of nanoparticles are quite different from the properties of the same materials on a larger scale [4,5]. These materials are obtained from the structured arrangement of groups of atoms and molecules or by minimizing macroscopic materials into a nanometer scale [6,7]. In the present years, various novel nanoparticles have received much attention due to their great potential in biomedical sciences [8,9], engineering [10,11], agriculture [12,13] and food safety [14,15].…”

Section: Introductionmentioning

confidence: 99%

A rapid synthesis and antibacterial property of selenium nanoparticles using egg white lysozyme as a stabilizing agent

et al. 2019

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A simple method for the rapid synthesis of selenium nanoparticles (SeNPs) by the reduction of selenium dioxide using an aqueous egg white lysozyme solution (stabilizing agent) and ascorbic acid solution (reducing agent) has been described. The formation of SeNPs is assured by characterization with UV-Vis, FT-IR, XRD and morphological characters that were observed using TEM analyses. The absorbance of the SeNPs is found at 250 nm. The TEM images show that the SeNPs are uniform and in spherical shape of size 40-60 nm. The crystalline nature of SeNPs is assured by XRD analysis. The antibacterial property of synthesized SeNPs was tested against the pathogenic bacteria, i.e., Bacillus subtilis, Bacillus cereus, Escherichia coli, Staphylococcus pneumoniae, Proteus mirabilis and Klebsiella pneumoniae. SeNPs showed more antibacterial activity against B. subtilis (19 mm) and Streptococcus pneumoniae (15 mm) as compared with commercially available antibiotics such as streptomycin and erythromycin. The SeNPs synthesized via this process has proficient antimicrobial activity against pathogenic bacteria. SeNPs could play a significant role in pharmaceutical industries for the development of efficient antibiotic agents.

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“…Within the last decade, magnetic nanoparticles have become one of the interesting research topic considering superior physical characteristics compared to the bulk phase [1,2]. Of the many nanoparticles of magnetic, cobalt ferrite becomes the main material.…”

Section: Introductionmentioning

confidence: 99%

Anealling dependence of structural and magnetic properties in aluminum substituted cobalt-ferrite nano particle

Purnama

Suharyana

2017

J. Phys.: Conf. Ser.

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Synthesis and characterization of Co0.8Fe2.2O4 nano ferrite S Raghuvanshi, S N Kane, N P Lalla et al.-FTIR and structural properties of coprecipitated cobalt ferrite nano particles E. Hutamaningtyas, Utari, Suharyana et al. Abstract. Anealling dependence of structural and magnetic properties in aluminum substituted cobalt ferrite nano particle are presented here. The composition is defined by the molestociometry calculation. The co-precipitation method is performed to produce of the aluminum substituted cobalt ferrite. The anealling temperature are selected to be 600°C, 800°C and 1000°C for 5 hours at atmosphere condition. The XRD results show that the XRD-peak increase with the increase of the anelling temperature. It mean that the fine crystalline structure realize at the higher temperature. The The VSM results indicate that the saturated magnetisation increase with increasing anealling temperature. This is can be explained that the refine of crystalline structure is also promote re-distribution cation at crystalline cites which the final of the magnetic moment become large at a higher temperature anealling.

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Searching for the nanoscopic–macroscopic boundary

Cited by 7 publications

References 30 publications

Investigation of Phase Transitions in Ferromagnetic Nanofilms on a Non-Magnetic Substrate by Computer Simulation

Investigation of Phase Transitions in Ferromagnetic Nanofilms on a Non-Magnetic Substrate by Computer Simulation

A rapid synthesis and antibacterial property of selenium nanoparticles using egg white lysozyme as a stabilizing agent

Anealling dependence of structural and magnetic properties in aluminum substituted cobalt-ferrite nano particle

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