SÍNTESE E CARACTERIZAÇÃO DE MATERIAL NANOPARTICULADO A BASE DE  γ-Fe2O3 E Fe3O4

Mendes, Matheus de Souza Lima; Ramos, Gabriela Soares Macello; Neves, Márcia Angelica Fernandes e Silva; Pedrosa, Marcelo Sierpe

doi:10.22407/1984-5693.2019.v11.p.55-67

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…The magnetic material, maghemite, was characterized by VSM to observe its magnetic strength. According to Mendes et al (2019), the average size of maghemite particles is 12 nm, indicating they may have superparamagnetic properties 10 . To confirm this property, VSM analysis was performed on the same maghemite sample, which according to Figure 3, did not present the hysteresis cycle, confirming its superparamagnetism.…”

Section: Resultsmentioning

confidence: 86%

“…The maghemite used was produced and characterized by Mendes et al (2019) 10 using X‐ray diffraction analysis (XRD). The nanoparticles used in this paper showed average particle size of 12 nm, below the 20 nm threshold for superparamagnetism, which was confirmed by analysis without a vibrating sample magnetometer (VSM).…”

Section: Methodsmentioning

confidence: 99%

“…Iron oxides have ferri/ferromagnetic properties when they have average particle size greater than 20 nm, while at lower values they have a property known as superparamagnetism 9 . Therefore, to obtain a material with this property (magnetization only in the presence of an externally applied magnetic field), the particle diameter must be smaller than 20 nm 10 . Magnetite is a ferri/ferromagnetic material containing particles with diameters of about 10 nm that can be synthesized using precipitation methods 11 .…”

Section: Introductionmentioning

confidence: 99%

“…There are many factors that can influence the incorporation of maghemite 15 during the polymerization process 16 and affect the properties of the produced polymers 10,17 . Among these factors, porosity is an important factor that can influence the incorporation of magnetic material.…”

Section: Introductionmentioning

confidence: 99%

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Experimental design to evaluate the efficiency of maghemite nanoparticles incorporation in styrene‐divinylbenzene copolymers

Mendes

Ramos

Neves

et al. 2020

J of Applied Polymer Sci

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Magnetized styrene‐divinylbenzene resins can be obtained by inserting superparamagnetic nanoparticles of maghemite (γ‐Fe2O3) in the polymeric matrix. The incorporation of this nanoparticulate material can be influenced by several factors. The objective of this work was to evaluate the influence of these variables through an experimental design, where three factors were evaluated: cross‐linking degree, initiator content and porogenic agent, at two levels. Subsequently, to evaluate the properties of the synthesized magnetized resins, magnetization curves were plotted using a vibrating sample magnetometer, thermal stability of the magnetized copolymer was determined by thermogravimetric analysis and the morphology was observed by scanning electron microscopy. The highest initiator content produced the greatest synthesis yield, and the presence of toluene had a positive effect on saturation magnetization, indicating that incorporation of maghemite in the polymer matrix and thermal degradation were influenced by higher divinylbenzene content.

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Section: Resultsmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental design to evaluate the efficiency of maghemite nanoparticles incorporation in styrene‐divinylbenzene copolymers

Mendes

Ramos

Neves

et al. 2020

J of Applied Polymer Sci

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“…Here we present a summary of these materials, including their morphologies, with focus on organic-inorganic magnetic nanocomposites and their in situ [30] and ex-situ [31] synthesis routes. The most used nanoparticles with magnetic properties are described to demonstrate the phenomenon of superparamagnetism [32][33][34][35] required to remove the nanocomposite from oily water.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Review of Magnetic Polymeric Nanocomposites with Superparamagnetic Iron Oxide Nanoparticles for Oil Removal from Water

Mendes¹,

Coutinho²,

Araujo³

et al. 2023

Rev. Chim.

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Several oil spills in aquatic environments have been reported over the last few years, and a great effort has been made to develop new techniques for collecting and removing oil from water on a large scale to prevent environmental pollution by this contaminant. In view of the various problems involving traditional methods, such as the generation of secondary pollution, high costs and complexity of synthesizing material and expenses to transport equipment, among others, new technologies have been developed for removal of oil from water. Among these, the use of magnetic polymeric nano-composites has presented promising results, since they have high oil adsorption efficiency, ease of material removal through an external magnetic field, low cost of synthesis and possibility of reusing the material for several cycles, among others. However, a lack of studies about these promising systems exists regarding this technology and its procedures. Therefore, here we present a brief bibliographic review of the synthesis routes to obtain magnetic polymeric nanocomposites containing superpara-magnetic iron oxide nanoparticles developed for oil removal from water and report future trends and perspectives for progress of this technology.

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Advances in Magnetic Polymeric Styrene-divinylbenzene Nanocomposites between Magnetite and Maghemite Nanoparticles: An Overview

Mendes

Araujo

Neves

et al. 2022

CAPS

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Superparamagnetic nanoparticles such as magnetite (Fe3O4) and maghemite (γ-Fe2O3) have been used to produce magnetic nanocomposites with several polymeric matrices, such as magnetic styrene-divinylbenzene nanocomposites. Through the incorporation of these nanoparticles, the nanocomposite presents the phenomena of superparamagnetism, low coercivity and high magnetic susceptibility. Due to these features, magnetic nanomaterials can be removed from the place where they are inserted through an external magnetic field, thus differentiating them from conventional systems such as those used for treating oily water that require high costs of chemical agents for removal. These properties depend directly on the size distribution of the nanoparticles and on the presence or absence of interactions between the surface of the polymeric matrix and the contaminants. These materials have many applications and for this purpose the objective of this work is to present a bibliographic review and state-of-the-art of the evolution of magnetic styrene-divinylbenzene nanocomposites over the years. According to the reports in the literature, these systems are superior to those applied conventionally in the sectors of biotechnology, agriculture, oil/gas, and nuclear chemistry, mainly for the removal of toxic metals from aqueous media

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SÍNTESE E CARACTERIZAÇÃO DE MATERIAL NANOPARTICULADO A BASE DE γ-Fe2O3 E Fe3O4

Cited by 3 publications

References 9 publications

Experimental design to evaluate the efficiency of maghemite nanoparticles incorporation in styrene‐divinylbenzene copolymers

Experimental design to evaluate the efficiency of maghemite nanoparticles incorporation in styrene‐divinylbenzene copolymers

Comprehensive Review of Magnetic Polymeric Nanocomposites with Superparamagnetic Iron Oxide Nanoparticles for Oil Removal from Water

Advances in Magnetic Polymeric Styrene-divinylbenzene Nanocomposites between Magnetite and Maghemite Nanoparticles: An Overview

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