Iron oxide nanoparticle powders with high surface area

Křížek, Michal; Pěchoušek, Jiří; Šafářová, Klára; Medřík, Ivo; Machala, Libor

doi:10.1063/1.4759476

Cited by 7 publications

(3 citation statements)

References 10 publications

(17 reference statements)

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“…Correspondingly, the BET surface area clearly increases from 283 m 2 /g to 421 m 2 /g. In particular, the latter value, relative to the Fh 1M sample, is considerably higher than most of the experimental results for ferrihydrite reported in previous literature [52]. Regarding the 1M sample obtained after 3 min, Fh 1Mfast , the profile of the isotherm is attributable to a type I(a), characteristic of microporous materials, having pores below 2 nm and no adsorption-desorption hysteresis.…”

Section: Production and Characterization Of Ferrihydrite Npscontrasting

confidence: 55%

Nano-Sized Fe(III) Oxide Particles Starting from an Innovative and Eco-Friendly Synthesis Method

et al. 2020

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This paper introduces an original, eco-friendly and scalable method to synthesize ferrihydrite nanoparticles in aqueous suspensions, which can also be used as a precursor to produce α-hematite nanoparticles. The method, never used before to synthesize iron oxides, is based on an ion exchange process allowing to operate in one-step, with reduced times, at room temperature and ambient pressure, and using cheap or renewable reagents. The influence of reagent concentrations and time of the process on the ferrihydrite features is considered. The transformation to hematite is then analyzed and discussed in relation to different procedures: (1) A natural aging in the water at room temperature; and (2) heat treatments at different temperatures and times. Structural and morphological features of the obtained nanoparticles are investigated by means of several techniques, such as X-ray diffraction, X-ray photoelectron spectroscopy, attenuated total reflectance Fourier transform infrared spectroscopy, transmission and scanning electron microscopy, thermal analysis, nitrogen adsorption and magnetic measurements. Ferrihydrite shows the typical spherical morphology and a very high specific surface area of 420 m2/g. Rhombohedral or plate-like hexagonal hematite nanoparticles are obtained by the two procedures, characterized by dimensions of 50 nm and 30 nm, respectively, and a specific surface area up to 57 m2/g, which is among the highest values reported in the literature for hematite NPs.

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Section: Production and Characterization Of Ferrihydrite Npscontrasting

confidence: 55%

Nano-Sized Fe(III) Oxide Particles Starting from an Innovative and Eco-Friendly Synthesis Method

et al. 2020

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“…A fast and cost-efficient synthesis method used to manufacture the IONs is coprecipitation using the Massart process [17,39]. In this method, superparamagnetic iron oxide nanoparticles ranging in size between 4 and 16 nm and with a high specific surface area >100 m 2 g −1 are generated [40][41][42][43]. The combination of bare IONs with LL showed improved antimicrobial activity yet led to uncontrolled agglomeration and a nonspecific weak binding with potential loss of the AMP [17].…”

Section: Introductionmentioning

confidence: 99%

“…A fast and cost-efficient synthesis method used to manufacture the IONs is coprecipitation using the Massart process [17,39]. In this method, superparamagnetic iron oxide nanoparticles ranging in size between 4 and 16 nm and with a high specific surface area >100 m 2 g −1 are generated [40][41][42][43]. The combination of The usage of UPy-coated IONs can combine the advantages of supramolecular engineering like efficient binding by self-assembly, adjustable cytocompatibility, and a controlled magnetic drug delivery with enhanced antimicrobial activity [44].…”

Section: Introductionmentioning

confidence: 99%

Iron Oxide Nanoparticles with Supramolecular Ureido-Pyrimidinone Coating for Antimicrobial Peptide Delivery

Turrina,

Cookman,

Bellan

et al. 2023

IJMS

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Antimicrobial peptides (AMPs) can kill bacteria by disrupting their cytoplasmic membrane, which reduces the tendency of antibacterial resistance compared to conventional antibiotics. Their possible toxicity to human cells, however, limits their applicability. The combination of magnetically controlled drug delivery and supramolecular engineering can help to reduce the dosage of AMPs, control the delivery, and improve their cytocompatibility. Lasioglossin III (LL) is a natural AMP form bee venom that is highly antimicrobial. Here, superparamagnetic iron oxide nanoparticles (IONs) with a supramolecular ureido-pyrimidinone (UPy) coating were investigated as a drug carrier for LL for a controlled delivery to a specific target. Binding to IONs can improve the antimicrobial activity of the peptide. Different transmission electron microscopy (TEM) techniques showed that the particles have a crystalline iron oxide core with a UPy shell and UPy fibers. Cytocompatibility and internalization experiments were carried out with two different cell types, phagocytic and nonphagocytic cells. The drug carrier system showed good cytocompatibility (>70%) with human kidney cells (HK-2) and concentration-dependent toxicity to macrophagic cells (THP-1). The particles were internalized by both cell types, giving them the potential for effective delivery of AMPs into mammalian cells. By self-assembly, the UPy-coated nanoparticles can bind UPy-functionalized LL (UPy-LL) highly efficiently (99%), leading to a drug loading of 0.68 g g−1. The binding of UPy-LL on the supramolecular nanoparticle system increased its antimicrobial activity against E. coli (MIC 3.53 µM to 1.77 µM) and improved its cytocompatible dosage for HK-2 cells from 5.40 µM to 10.6 µM. The system showed higher cytotoxicity (5.4 µM) to the macrophages. The high drug loading, efficient binding, enhanced antimicrobial behavior, and reduced cytotoxicity makes ION@UPy-NH2 an interesting drug carrier for AMPs. The combination with superparamagnetic IONs allows potential magnetically controlled drug delivery and reduced drug amount of the system to address intracellular infections or improve cancer treatment.

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Application of hierarchical nanostructured aluminum oxyhydroxide for bleeding control

Ложкомоев

Mamonova²,

Gavrilova³

et al. 2019

Proceedings of the International Conference on Advanced Materials With Hierarchical Structure for New Technologies and Reliable

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Iron oxide nanoparticle powders with high surface area

Cited by 7 publications

References 10 publications

Nano-Sized Fe(III) Oxide Particles Starting from an Innovative and Eco-Friendly Synthesis Method

Nano-Sized Fe(III) Oxide Particles Starting from an Innovative and Eco-Friendly Synthesis Method

Iron Oxide Nanoparticles with Supramolecular Ureido-Pyrimidinone Coating for Antimicrobial Peptide Delivery

Application of hierarchical nanostructured aluminum oxyhydroxide for bleeding control

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