Size and distribution of the iron oxide nanoparticles in SBA-15 nanoporous silica via SANS study

Zeleňáková, A.; Hrubovčák, Pavol; Kapusta, Ondrej; Kučerka, Norbert; Kuklin, A. I.; Ivankov, Oleksandr I.; Zeleňák, Vladimı́r

doi:10.1038/s41598-019-52417-w

Cited by 14 publications

(10 citation statements)

References 32 publications

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“…Based on the enhanced neutron absorption apparent from SANS data (Fig. 1 b) along with analogy to similar nanocomposite 16 , 35 containing iron oxide NPs instead of Gd 2 O 3 , larger nanoparticles’ formation on the surface of the SBA16/Gd 2 O 3 -4 M nanocomposite is presumable. One can hypothesize on the coexistence of magnetic phases corresponding to the larger nanoparticles with higher crystallinity and small particles in the matrix pores with significant lattice disorder.…”

Section: Discussionmentioning

confidence: 91%

“…The matrix pores are therefore deemed sparsely occupied by the Gd 2 O 3 NPs and the scattering signal from the composite is supposed to closely resemble that of the hollow SBA15 matrix. In order to address the structure of the system, we have applied the model that we have developed for similar series of nanocomposites, where Fe 2 O 3 instead of Gd 2 O 3 NPs were introduced into the SBA15 matrix 17 . Briefly, total SANS intensity of the composite is assumed as a superposition of signals corresponding to the two subsystem contributions – scattering from the blank matrix and the system of Gd 2 O 3 NPs.…”

Section: Resultsmentioning

confidence: 99%

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Gadolinium-oxide nanoparticles for cryogenic magnetocaloric applications

Zeleňáková

Hrubovčák

Berkutova

et al. 2022

Sci Rep

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The series of advanced nanocomposites consisting of Gd2O3 nanoparticles (NPs) embedded into periodic porous SiO2 matrix have been investigated with respect to their structural and magnetocaloric properties. By means of small angle neutron scattering and transmission electron microscopy, regular nanopores organized in the cubic or hexagonal superlattice have been documented. The pores are occupied by the NPs of progressive concentration within the nanocomposite series. All of the examined systems have exhibited extraordinarily high values of magnetic entropy change (up to 70 J kg−1 K−1) at low temperatures with the absence of thermal hysteresis, indicating their perspective utilization in cryogenic refrigeration. Profound analysis of magnetic entropy change data via scaling laws has been applied to the nanocomposite materials for the very first time. With the aid of scaling analysis, conclusions on magnetic properties and phase transition type have been made, even for the conditions unavailable in the laboratory.

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Section: Discussionmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Gadolinium-oxide nanoparticles for cryogenic magnetocaloric applications

Zeleňáková

Hrubovčák

Berkutova

et al. 2022

Sci Rep

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“…Since sample 4 (MCM-41/Napro/Fe 2 O 3 ) was produced from sample 3 by subsequent loading of drug naproxen, the presence of hematite magnetic nanoparticles in sample 4 is obvious. The phase composition of samples containing iron oxide magnetic nanoparticles prepared in a similar way in different mesoporous silicas was studied previously in our recent paper [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Magnetic Characterization and Moderate Cytotoxicity of Magnetic Mesoporous Silica Nanocomposite for Drug Delivery of Naproxen

et al. 2021

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In this study, we describe the magnetic and structural properties and cytotoxicity of drug delivery composite (DDC) consisting of hexagonally ordered mesoporous silica, iron oxide magnetic nanoparticles (Fe2O3), and the drug naproxen (Napro). The nonsteroidal anti-inflammatory drug (NSAID) naproxen was adsorbed into the pores of MCM-41 silica after the ultra-small superparamagnetic iron oxide nanoparticles (USPIONs) encapsulation. Our results confirm the suppression of the Brownian relaxation process caused by a “gripping effect” since the rotation of the whole particle encapsulated in the porous system of mesoporous silica was disabled. This behavior was observed for the first time, to the best of our knowledge. Therefore, the dominant relaxation mechanism in powder and liquid form is the Néel process when the rotation of the nanoparticle’s magnetic moment is responsible for the relaxation. The in vitro cytotoxicity tests were performed using human glioma U87 MG cells, and the moderate manifestation of cell death, although at high concentrations of studied systems, was observed with fluorescent labeling by AnnexinV/FITC. All our results indicate that the as-prepared MCM-41/Napro/Fe2O3 composite has a potential application as a drug nanocarrier for magnetic-targeted drug delivery.

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“…Among the crystalline and amorphous forms of iron oxide [11], the latter one has a specific role in sensing [12], gas sorption [13], and electrode materials [14]. An amorphous iron oxide nanoparticle (AIONP) [15] has a larger surface area in comparison to the crystalline IONPs [16]. This is because the disturbed surface structure along with a huge number of unsaturated bonds enhances their catalytic activity and superparamagnetic behavior [17].…”

Section: Introductionmentioning

confidence: 99%

Cytotoxicity, Removal of Congo Red Dye in Aqueous Solution Using Synthesized Amorphous Iron Oxide Nanoparticles from Incense Sticks Ash Waste

Yadav¹,

Gnanamoorthy

Ali

et al. 2022

Journal of Nanomaterials

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Magnetic nanoparticles have gained huge importance in the last ten years. They have found tremendous applications in the field of medicine, electronics, and environmental cleanup. The synthesis of amorphous iron oxide nanoparticles (AIONPs) is expensive making its applications highly overpriced. This research study reports the synthesis of AIONPs from waste incense sticks ash (ISA) in two steps. The first step is the recovery of ferrous fractions from ISA, followed by concentrated HCl treatment of magnetic fraction along with ultrasonication. And the second step includes treatment of ferrous-rich leachate with sodium hydroxides. The size of synthesized AIONPs varied from 40-90 nm and were highly aggregated due to the formation of large clumps. Cytotoxicity of synthesized AIONPs was determined on a normal human lung (BEAS-2B) cell line by using an MTT assay. Data showed that AIONPs induced cell toxicity in a dose-dependent manner. The particles were mainly spherical to rod-shaped and highly aggregated, it was confirmed by the microscopy analysis. The Fourier transform infrared (FT-IR) and Raman spectroscopy revealed the Fe-O, Si-O-Al as major functional groups in the AIONPs, while X-ray diffraction (XRD) revealed the amorphicity and physical property measurement system (PPMS) revealed the magnetic strength of the synthesized AIONPs. Finally, the AIONPs particles were applied for the remediation of Congo red dye from the wastewater by the adsorption method, and about 72% removal was achieved after one hour. The utilization of such ISA waste, for the synthesis of value-added minerals and their utilization for environmental cleanup, makes this whole process cost-efficient and environment-friendly.

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Size and distribution of the iron oxide nanoparticles in SBA-15 nanoporous silica via SANS study

Cited by 14 publications

References 32 publications

Gadolinium-oxide nanoparticles for cryogenic magnetocaloric applications

Gadolinium-oxide nanoparticles for cryogenic magnetocaloric applications

Magnetic Characterization and Moderate Cytotoxicity of Magnetic Mesoporous Silica Nanocomposite for Drug Delivery of Naproxen

Cytotoxicity, Removal of Congo Red Dye in Aqueous Solution Using Synthesized Amorphous Iron Oxide Nanoparticles from Incense Sticks Ash Waste

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