Highly stable- silica encapsulating magnetite nanoparticles (Fe3O4/SiO2) synthesized using single surfactantless- polyol process

Abbas, Mohamed; Rao, B. Bhaskara; Islam, Md. Nazrul; Naga, S. M.; Takahashi, M.; Kim, CheolGi

doi:10.1016/j.ceramint.2013.07.019

Cited by 98 publications

(36 citation statements)

References 17 publications

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“…Numerous chemical methods can be used to synthesize magnetic nanoparticles such as microemulsion, 18 sol-gel synthesis, 19 sonochemical reactions, 20 hydrothermal reactions, 21 hydrolysis and thermolysis of precursors, 22 flow injection 23 and electrospray synthesis. 24 The most common method for the preparation of magnetite nanoparticles is the chemical coprecipitation of iron salts.…”

Section: Resultsmentioning

confidence: 99%

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

et al. 2015

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The binding and release of trivalent rare earth element (REE) cations (Dy(3+), Nd(3+) and La(3+)) from solutions by a new fully characterized magnetic nano adsorbent material, consisting of iminodiacetic acid ligand (H2IDA) grafted onto SiO2 covered γ-Fe2O3 nanoparticles, was investigated. The nano adsorbent revealed a slightly higher capacity towards heavier REE and appreciable selectivity, especially on desorption. It was found that the composition of the surface complex was RE(3+) : L = 1 : 1. The complexation of the molecular H2IDA with RE(3+) in this ratio under non-basic conditions was therefore investigated by X-ray crystallography to produce relevant molecular models. Unexpectedly big differences in coordination numbers and binding mode of IDA along with distinct analogies in packing of the ligand molecules in the obtained 2D-coordination polymer structures provided valuable insights into possible reasons for the observed selectivity.

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Section: Resultsmentioning

confidence: 99%

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

et al. 2015

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“…The iron oxide/silicon oxide nanocomposite was achieved by modifying the Stober process via the hydrolysis of tetraethyl orthosilicate (TEOS) in the presence of Fe 3 O 4 nanoparticles based on the previous work (Wei et al, 2012;Abbas et al, 2014). We dispersed 0.1 g of as-synthesized Fe 3 O 4 in 20 ml of water by using an ultrasonic wave.…”

Section: Preparation Of Fe 3 O 4 /Sio 2 Nanocompositementioning

confidence: 99%

Preparation of Fe3O4/SiO2/TiO2/CeVO4 Nanocomposites: Investigation of Photocatalytic Effects on Organic Pollutants, Bacterial Environments, and New Potential Therapeutic Candidate Against Cancer Cells

et al. 2020

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The new nanocomposite with various molar ratios along with magnetic properties was fabricated via precipitation (assisted by ultrasonic) procedure. The photocatalytic effects of methylene blue (∼90% degradation for optimized sample in 100 min) for finding the optimized sample performed under visible light irradiation. Moreover, the photo-antibacterial impacts of bacteria culture environments were found with an optimized sample that had effective destruction of bacteria in comparison to control group. The cytotoxicity properties of panc1 cells and magnetic behaviors of the obtained nanomaterials were evaluated and its IC50 was about 500 mg/L. As an initial step, the structural, morphological and magnetic characteristics of the fabricated nanocomposites were evaluated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) and MAP, UV-visible diffuse reflectance spectroscopy (DRS), and vibrating sample magnetometry (VSM) approaches. Based on SEM results, the size of nanoparticles in fabricated nanocomposite was nearly 50-70 nm for Fe 3 O 4 /SiO 2 /TiO 2 and 80-100 nm for Fe 3 O 4 /SiO 2 /TiO 2 /CeVO 4 . XRD results showed that desired nanocomposites were truly synthesized without any impurities.

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“…To enhance the robustness, colloidal stability and surface reactivity, the citrate functionalized IONPs were coated with a thin shell of silica by sol-gel processing [44]. A thin silica shell is expected to maintain the magnetic properties of the IONPs while at the same time providing oxidation resistance for practical applications [45]. It has been argued that silica is the best choice for screening interactions between IONPs because of well-known chemical silicasurface modification [46].…”

Section: Synthesis Of Polymer Grafted Ionpsmentioning

confidence: 99%

High temperature stability and low adsorption of sub-100 nm magnetite nanoparticles grafted with sulfonated copolymers on Berea sandstone in high salinity brine

Iqbal

Lyon

Ureña-Benavides

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The synthesis of polymer grafted nanoparticles that are stable at high salinities and high temperature with low retention in porous media is of paramount importance for subsurface applications including electromagnetic imaging, enhanced oil recovery and environmental remediation. Herein, we present an improved approach to synthesize and purify sub-100 nm IONPs grafted with a random copolymer poly(AMPS-co-AA) (poly(2-acrylamido-3methylpropanesulfonate-co-acrylic acid)) by means of catalyzed amide bond formation at room temperature. The improved and uniform polymer grafting of magnetic nanoparticles led to colloidal stability of IONPs at high temperature (120 °C) in API for a month. The transport behavior of the polymer grafted IONPs was investigated in crushed and in consolidated Berea sandstone. The high poly (AMPS-co-AA) polymer level on the surface (~34%) provided electrosteric stabilization between the NPs and weak interactions of the NPs with anionic silica and sandstone surfaces. This behavior was enabled by low affinity of Ca 2+ towards the highly acidic AMPS monomers thus enabling strong solvation in API brine. In crushed Berea sandstone, the retention was reduced by three fold and nine fold relative to our earlier studies, given the improvements in the grafted polymer layer. For intact core flood experiments in Berea sandstone carried out at elevated temperature (65 o C) and pressure (1000 psi net confining stress), the retention was 519 µg/g, comparable to the value for crushed Berea sandstone. Furthermore, the addition of a relatively small amount (0.1% v/v) of commercially available sacrificial polymer (e.g., HEC-10) further reduced IONP retention to 252 µg/g or 0.17 mg/m 2 by blocking retentive sites.

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Highly stable- silica encapsulating magnetite nanoparticles (Fe3O4/SiO2) synthesized using single surfactantless- polyol process

Cited by 98 publications

References 17 publications

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

Preparation of Fe3O4/SiO2/TiO2/CeVO4 Nanocomposites: Investigation of Photocatalytic Effects on Organic Pollutants, Bacterial Environments, and New Potential Therapeutic Candidate Against Cancer Cells

High temperature stability and low adsorption of sub-100 nm magnetite nanoparticles grafted with sulfonated copolymers on Berea sandstone in high salinity brine

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