The Influence of Synthesis Parameters on FeO(OH) / Fe<sub>2</sub>O<sub>3</sub> Formation by Hydrothermal Techniques

Popescu, Madalina Laura; Piticescu, Roxana Mioara; Vasile, Eugeniu; Taloi, Dragos; Petriceanu, Mirela; Stoiciu, Maria; Bădiliţă, Viorel

doi:10.1515/znb-2010-0808

Cited by 9 publications

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“…Our previous studies have addressed the role of pressure and temperature on the formation of hematite (Fe 2 O 3 ) by the hydrothermal method [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…To this end, the hydrothermal synthesis of magnetite nanoparticles has been investigated, which offers numerous advantages over the use of commercial magnetite, such as: obtaining of crystalline nanoparticles in a single-step, no post-heat treatment is required for the synthesized particles, the process is relatively cost-effective (requires low energy consumption) and environmentally friendly (reaction takes place in an aqueous medium, without organic solvents), products with controllable size and good morphology [29,31]. This paper represents a step forward in demonstrating the potential of the hydrothermal process to obtain a variety of iron oxides and to control the synthesis parameters so as to obtain compounds with controlled morphology and composition.…”

Section: Introductionmentioning

confidence: 99%

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One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

et al. 2020

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Iron oxide nanoparticles have received remarkable attention in different applications. For biomedical applications, they need to possess suitable core size, acceptable hydrodynamic diameter, high saturation magnetization, and reduced toxicity. Our aim is to control the synthesis parameters of nanostructured iron oxides in order to obtain magnetite nanoparticles in a single step, in environmentally friendly conditions, under inert gas atmosphere. The physical–chemical, structural, magnetic, and biocompatible properties of magnetite prepared by hydrothermal method in different temperature and pressure conditions have been explored. Magnetite formation has been proved by Fourier-transform infrared spectroscopy and X-ray diffraction characterization. It has been found that crystallite size increases with pressure and temperature increase, while hydrodynamic diameter is influenced by temperature. Magnetic measurements indicated that the magnetic core of particles synthesized at high temperature is larger, in accordance with the crystallite size analysis. Particles synthesized at 100 °C have nearly identical magnetic moments, at 20 × 103 μB, corresponding to magnetic cores of 10–11 nm, while the particles synthesized at 200 °C show slightly higher magnetic moments (25 × 103 μB) and larger magnetic cores (13 nm). Viability test results revealed that the particles show only minor intrinsic toxicity, meaning that these particles could be suited for biomedical applications.

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“…Our previous studies have addressed the role of pressure and temperature on the formation of hematite (Fe 2 O 3 ) by the hydrothermal method [31,32].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

et al. 2020

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“…To our knowledge, there have been no investigations regarding the effect of high pressure on the formation and phase transformations of iron oxides in aqueous environments under hydrothermal conditions. In our previous work [43], the influence of the main synthesis parameters (temperature, time, pressure) on the formation of nanosized Fe 2 O 3 particles has been studied up to the pressure of 20 bar.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

et al. 2020

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Magnetic iron oxides have been used in biomedical applications, such as contrast agents for magnetic resonance imaging, carriers for controlled drug delivery and immunoassays, or magnetic hyperthermia for the past 40 years. Our aim is to investigate the effect of pressure and temperature on the structural, thermal, and magnetic properties of iron oxides prepared by hydrothermal synthesis at temperatures of 100–200 °C and pressures of 20–1000 bar. It has been found that pressure influences the type of iron oxide crystalline phase. Thus, the results obtained by Mössbauer characterization are in excellent agreement with X-ray diffraction and optical microscopy characterization, showing that, for lower pressure values (<100 bar), hematite is formed, while, at pressures >100 bar, the major crystalline phase is goethite. In addition, thermal analysis results are consistent with particle size analysis by X-ray diffraction, confirming the crystallization of the synthesized iron oxides. One order of magnitude higher magnetization has been obtained for sample synthesized at 1000 bar. The same sample provides after annealing treatment, the highest amount of good quality magnetite leading to a magnetization at saturation of 30 emu/g and a coercive field of 1000 Oe at 10 K and 450 Oe at 300 K, convenient for various applications.

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“…To our knowledge, there have been no investigations regarding the effect of high pressure on the formation and phase transformations of iron oxides in aqueous environments under hydrothermal conditions. In our previous work [36], the influence of the main synthesis parameters (temperature, time, pressure) on the formation of nanosized Fe2O3 particles has been studied up to pressure of 20 bar.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

Cursaru

Piticescu

Dragut

et al. 2019

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Magnetic iron oxide particles are used for in vitro diagnostics for nearly 40 years. Due to their unique physical, chemical, thermal and mechanical properties, as well as biocompatibility and low toxicity in the human body, iron oxide nanoparticles have been used in many biomedical applications, such as contrast agents for magnetic resonance imaging, carriers for controlled drug delivery and immunoassays, but also in magnetic hyperthermia. Our aim is to investigate the effect of pressure and temperature on the structural, thermal and magnetic properties of iron oxide nanomaterials prepared by hydrothermal synthesis. Iron oxide nanoparticles were synthesized at temperatures of 100-200°C and pressures of 20-1000 bar. It has been found that pressure influences the type of iron oxide crystalline phase. Thus, for lower pressure values (< 100 bar), iron oxide is predominantly formed as hematite, while at pressures > 100 bar, the major crystalline phase is goethite. The complex thermal analysis revealed the polymorphic changes of iron oxides at different temperatures. The existence of specific magnetite and hematite phases in all thermally treated samples are evidenced through the specific Verwey and Morin transitions highlighted by ZFC-FC (Zero Field Cooled-Field Cooled) measurements, whereas their relative content is precisely provided by Mössbauer spectroscopy.

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The Influence of Synthesis Parameters on FeO(OH) / Fe₂O₃ Formation by Hydrothermal Techniques

Cited by 9 publications

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One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

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The Influence of Synthesis Parameters on FeO(OH) / Fe2O3 Formation by Hydrothermal Techniques

Cited by 9 publications

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One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

One-Step Soft Chemical Synthesis of Magnetite Nanoparticles under Inert Gas Atmosphere. Magnetic Properties and In Vitro Study

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials

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The Influence of Synthesis Parameters on FeO(OH) / Fe₂O₃ Formation by Hydrothermal Techniques