TY  - JOUR
AU  - Tadić, Marin
AU  - Trpkov, Djordje
AU  - Kopanja, Lazar
AU  - Vojnović, Sandra
AU  - Panjan, Matjaz
PY  - 2019
UR  - https://imagine.imgge.bg.ac.rs/handle/123456789/1266
AB  - In this work, we present the magnetic and structural properties of alpha-Fe2O3 nanoparticles synthesized by the hydrothermal synthesis method. XRD, FTIR and Raman spectroscopy indicate that the samples consist of single-phase alpha-Fe2O3 nanoparticles. A microstructural analysis by TEM and SEM shows: (i) irregular nanoparticles (similar to 50 nm), (ii) plate-like nanoparticles (with thickness t similar to 10 nm and diameter d similar to 50 -80 nm) and (iii) microsized ellipsoid 3D superstructures (with length l similar to 3.5 and diameter d similar to 1.5 mu m) composed of nanosized building blocks (similar to 50 nm). We used circularity, elongation and convexity measures to quantitatively analyze the shape of the particles. Irregular hematite nanoparticles were synthesized using a water solution of ferric precursor and sodium acetate during the hydrothermal reaction (reaction conditions: T = 180 degrees C, t = 12 h). The same hydrothermal reaction temperature, reaction duration and ferric precursor (without sodium acetate) were used for synthesizing hematite ellipsoid 3D superstructures. Addition of urea and glycine surfactants in hydrothermal reaction resulted in the formation of nanoplate hematite particles. The role of these surfactants on the structure and morphology of the particles was also investigated. Magnetic measurements at the room temperature displayed a wide range of coercivities, from H-C = 73 Oe for irregular nanoparticles, H-C = 689 Oe for nanoplates to H-C = 2688 Oe for hematite ellipsoid 3D superstructures. The measured coercivity for the ellipsoid superstructure was about 35 times higher than in the case of irregular hematite nanoparticles and about 4 times than the coercivity of hematite nanoplates. Magnetic properties of synthesized samples were related to their structure and morphology. We conclude that shape anisotropy influenced enhancement of the coercivity in hematite nanoplates whereas hematite ellipsoid 3D superstructure (nanoparticle clusters) induced the formation of multidomain magnetic structure and highest coercivity revealing its superior structure for enhanced magnetic properties. The synthesized hematite nanoparticle structures exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating a safe use of these nanoparticles for practical applications.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - Hydrothermal synthesis of hematite (alpha-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties
EP  - 609
SP  - 599
VL  - 792
DO  - 10.1016/j.jallcom.2019.03.414
ER  - 

@article{
author = "Tadić, Marin and Trpkov, Djordje and Kopanja, Lazar and Vojnović, Sandra and Panjan, Matjaz",
year = "2019",
abstract = "In this work, we present the magnetic and structural properties of alpha-Fe2O3 nanoparticles synthesized by the hydrothermal synthesis method. XRD, FTIR and Raman spectroscopy indicate that the samples consist of single-phase alpha-Fe2O3 nanoparticles. A microstructural analysis by TEM and SEM shows: (i) irregular nanoparticles (similar to 50 nm), (ii) plate-like nanoparticles (with thickness t similar to 10 nm and diameter d similar to 50 -80 nm) and (iii) microsized ellipsoid 3D superstructures (with length l similar to 3.5 and diameter d similar to 1.5 mu m) composed of nanosized building blocks (similar to 50 nm). We used circularity, elongation and convexity measures to quantitatively analyze the shape of the particles. Irregular hematite nanoparticles were synthesized using a water solution of ferric precursor and sodium acetate during the hydrothermal reaction (reaction conditions: T = 180 degrees C, t = 12 h). The same hydrothermal reaction temperature, reaction duration and ferric precursor (without sodium acetate) were used for synthesizing hematite ellipsoid 3D superstructures. Addition of urea and glycine surfactants in hydrothermal reaction resulted in the formation of nanoplate hematite particles. The role of these surfactants on the structure and morphology of the particles was also investigated. Magnetic measurements at the room temperature displayed a wide range of coercivities, from H-C = 73 Oe for irregular nanoparticles, H-C = 689 Oe for nanoplates to H-C = 2688 Oe for hematite ellipsoid 3D superstructures. The measured coercivity for the ellipsoid superstructure was about 35 times higher than in the case of irregular hematite nanoparticles and about 4 times than the coercivity of hematite nanoplates. Magnetic properties of synthesized samples were related to their structure and morphology. We conclude that shape anisotropy influenced enhancement of the coercivity in hematite nanoplates whereas hematite ellipsoid 3D superstructure (nanoparticle clusters) induced the formation of multidomain magnetic structure and highest coercivity revealing its superior structure for enhanced magnetic properties. The synthesized hematite nanoparticle structures exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating a safe use of these nanoparticles for practical applications.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "Hydrothermal synthesis of hematite (alpha-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties",
pages = "609-599",
volume = "792",
doi = "10.1016/j.jallcom.2019.03.414"
}

Tadić, M., Trpkov, D., Kopanja, L., Vojnović, S.,& Panjan, M.. (2019). Hydrothermal synthesis of hematite (alpha-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 792, 599-609.
https://doi.org/10.1016/j.jallcom.2019.03.414

Tadić M, Trpkov D, Kopanja L, Vojnović S, Panjan M. Hydrothermal synthesis of hematite (alpha-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties. in Journal of Alloys and Compounds. 2019;792:599-609.
doi:10.1016/j.jallcom.2019.03.414 .

Tadić, Marin, Trpkov, Djordje, Kopanja, Lazar, Vojnović, Sandra, Panjan, Matjaz, "Hydrothermal synthesis of hematite (alpha-Fe2O3) nanoparticle forms: Synthesis conditions, structure, particle shape analysis, cytotoxicity and magnetic properties" in Journal of Alloys and Compounds, 792 (2019):599-609,
https://doi.org/10.1016/j.jallcom.2019.03.414 . .

TY  - JOUR
AU  - Tadić, Mann
AU  - Kopanja, Lazar
AU  - Panjan, Matjaz
AU  - Kralj, Slavko
AU  - Nikodinović-Runić, Jasmina
AU  - Stojanović, Zoran
PY  - 2017
UR  - https://imagine.imgge.bg.ac.rs/handle/123456789/1806
AB  - Hematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase alpha-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio 5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity H-C = 2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles' for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Surface Science
T1  - Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity
EP  - 634
SP  - 628
VL  - 403
DO  - 10.1016/j.apsusc.2017.01.115
ER  - 

@article{
author = "Tadić, Mann and Kopanja, Lazar and Panjan, Matjaz and Kralj, Slavko and Nikodinović-Runić, Jasmina and Stojanović, Zoran",
year = "2017",
abstract = "Hematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase alpha-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio 5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity H-C = 2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles' for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Surface Science",
title = "Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity",
pages = "634-628",
volume = "403",
doi = "10.1016/j.apsusc.2017.01.115"
}

Tadić, M., Kopanja, L., Panjan, M., Kralj, S., Nikodinović-Runić, J.,& Stojanović, Z.. (2017). Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity. in Applied Surface Science
Elsevier Science Bv, Amsterdam., 403, 628-634.
https://doi.org/10.1016/j.apsusc.2017.01.115

Tadić M, Kopanja L, Panjan M, Kralj S, Nikodinović-Runić J, Stojanović Z. Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity. in Applied Surface Science. 2017;403:628-634.
doi:10.1016/j.apsusc.2017.01.115 .

Tadić, Mann, Kopanja, Lazar, Panjan, Matjaz, Kralj, Slavko, Nikodinović-Runić, Jasmina, Stojanović, Zoran, "Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity" in Applied Surface Science, 403 (2017):628-634,
https://doi.org/10.1016/j.apsusc.2017.01.115 . .

TY  - JOUR
AU  - Tadić, Mann
AU  - Kopanja, Lazar
AU  - Panjan, Matjaz
AU  - Kralj, Slavko
AU  - Nikodinović-Runić, Jasmina
AU  - Stojanović, Zoran
PY  - 2017
UR  - https://imagine.imgge.bg.ac.rs/handle/123456789/1049
AB  - Hematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase alpha-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio 5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity H-C = 2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles' for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Surface Science
T1  - Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity
EP  - 634
SP  - 628
VL  - 403
DO  - 10.1016/j.apsusc.2017.01.115
ER  - 

@article{
author = "Tadić, Mann and Kopanja, Lazar and Panjan, Matjaz and Kralj, Slavko and Nikodinović-Runić, Jasmina and Stojanović, Zoran",
year = "2017",
abstract = "Hematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase alpha-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio 5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity H-C = 2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles' for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Surface Science",
title = "Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity",
pages = "634-628",
volume = "403",
doi = "10.1016/j.apsusc.2017.01.115"
}

Tadić, M., Kopanja, L., Panjan, M., Kralj, S., Nikodinović-Runić, J.,& Stojanović, Z.. (2017). Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity. in Applied Surface Science
Elsevier Science Bv, Amsterdam., 403, 628-634.
https://doi.org/10.1016/j.apsusc.2017.01.115

Tadić M, Kopanja L, Panjan M, Kralj S, Nikodinović-Runić J, Stojanović Z. Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity. in Applied Surface Science. 2017;403:628-634.
doi:10.1016/j.apsusc.2017.01.115 .

Tadić, Mann, Kopanja, Lazar, Panjan, Matjaz, Kralj, Slavko, Nikodinović-Runić, Jasmina, Stojanović, Zoran, "Synthesis of core-shell hematite (α-Fe 2 O 3 ) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity" in Applied Surface Science, 403 (2017):628-634,
https://doi.org/10.1016/j.apsusc.2017.01.115 . .