Evaluation of magnetic nanoparticles coated by oleic acid applied to solvent extraction processes

Lobato, Natália Cristina Candian; Ferreira, Ângela de Mello; Mansur, Marcelo Borges

doi:10.1016/j.seppur.2016.05.027

Cited by 22 publications

(8 citation statements)

References 20 publications

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“…Meanwhile, peaks of functional groups of Ag were detected at 1652 cm À1 (N-Ag) and 3002 cm À1 (C-Ag) [44]. Oleic acid as the first layer was detected by the appearance of a C¼C vibration at 1312 cm À1 [13], carboxyl group (COO À ) vibrations at 1401 and 1444 cm À1 [45], and CH 2 vibrations at 2849 and 2910 cm À1 [46]. In addition, DMSO as the second layer was detected by the appearance of peaks of S¼O vibrations at 941 and 1022 cm À1 [47].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Fe3O4/Ag nanohybrid ferrofluids and their applications as antimicrobial and antifibrotic agents

Taufiq

Saputro

Susanto

et al. 2020

Heliyon

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To date, the search for creating stable ferrofluids with excellent properties for biomedical application is one of the challenging scientific and practical investigations. In this study, novel Fe 3 O 4 /Ag nanohybrid ferrofluids from iron sand were synthesized using a double-layer method. The Fe 3 O 4 /Ag nanocomposites exhibited stable crystallite sizes of 11.8 12.1 nm and 36.8-37.2 nm for Fe 3 O 4 and Ag, respectively. The lattice parameters of the spinel structure Fe 3 O 4 and face-centered cubic Ag were respectively 8.344 Å and 4.091 Å. With increasing Ag amount, the crystallite phase of Ag in the nanocomposites increased from 40.2% to 77.2%. The XPS results confirmed that Fe 3 O 4 /Ag nanocomposites were successfully prepared, where Fe 3 O 4 mixed well with Ag via strong ionic bonding. The FTIR results confirmed the presence of Fe 3 O 4 /Ag, oleic acid, and dimethyl sulfoxide as the filler, first layer, and second layer, respectively. The as-prepared ferrofluids exhibited superparamagnetic behavior, where the saturation magnetization decreased with increasing Ag content. The Fe 3 O 4 /Ag nanohybrid ferrofluids exhibited excellent antimicrobial performance against Bacillus subtilis, Staphylococcus aureus, Escherichia coli, and Candida albicans. More importantly, the Fe 3 O 4 /Ag nanohybrid ferrofluids decreased the progression of liver fibrosisrelated inflammation and fibrogenic activity on hepatic stellate cells.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Fe3O4/Ag nanohybrid ferrofluids and their applications as antimicrobial and antifibrotic agents

Taufiq

Saputro

Susanto

et al. 2020

Heliyon

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“…Magnetite nanoparticles (Fe 3 O 4 ) are specifically important due to increasing number of possibilities and technological applications as solid support through enzyme, biomedical sorption process and catalysis system together with magnetic division processes and formation of elevated specific surface area magnetic composites [1][2][3] . Nanosized particles with magnetic properties can be efficiently separated from wastewater by using magnetic separators, avoiding the filtration process, which represents a difficulty in using nanosized materials at the treatment of great volumes of wastewaters in environmental remediation processes.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Assessment of Magnetite Nanoparticles (Fe3O4) Obtained by Chemical Precipitation Under Different Synthesis Conditions

et al. 2018

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Magnetite nanosized particles synthesis was achieved by two different routes. Assessment of microstructure was carried out aiming at comparing the outcome of synthesis parameters on the crystallinity, distribution of particle dimension and magnetic activity of nanosized particles precipitated in aqueous solution. Increasing of the nanoparticles crystallite size by stirring could be evidenced by the results. Temperature does not significantly affect crystallite size and crystallinity. The type of precursor was the factor that most contributed to the definition of crystallinity and particle size distribution. The route which used FeSO 4 .7H 2 O as precursor favored large crystallite sizes and crystallinity, while the route which used Fe 2 SO 4 .7H 2 O and FeCl 3 .6H 2 O as precursors resulted in much smaller crystallite sizes and crystallinity.

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“…To obtain a magnetized organic solution, hydrophobic superparamagnetic nanoparticles are dispersed in an organic solvent containing an extractant, responsible to selectively react with the metal in the aqueous phase. After contact with the two phases, and the metal thus being transferred from the aqueous phase to the organic phase, a magnetic field is applied to accelerate the phase disengagement step 1,[7][8][9][10] . In fact, the results of phase disengagement with magnetic nanoparticles was faster, but the values varied significantly depending on the operating conditions and other specification of the system, such as the type and the concentration of the extractant, aqueous composition, concentration of the nanoparticles, etc.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Chemical Stability of Hydrophilic and Hydrophobic Magnetic Nanoparticles

2017

Self Cite

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Magnetic nanoparticles can improve the efficiency of phase separation time in multi-stage operations when a magnetic field is present. As such operations involve contact with aqueous and/or organic solutions, hydrophilic magnetic nanoparticles synthesized through the co-precipitation method were functionalized with oleic acid to attain hydrophobic magnetic nanoparticles. Both nanoparticles were characterized morphologically, chemically and magnetically. The results revealed that the particles (size ≈ 10 nm) consisted of an iron oxide mixture of magnetite and maghemite. The functionalization with oleic acid was effective in converting them into hydrophobic nanoparticles. Both particles were ferro/ferrimagnetic and the presence of oleic acid did not interfere significantly in the saturation magnetization value. The chemical stability of both nanoparticles were also evaluated, as an attempt of simulating broad industrial conditions to which the nanoparticles may be subjected; the hydrophilic nanoparticles were resistant at pH ≥ 4, while the hydrophobic nanoparticles were stable at pH ≥ 3.

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Evaluation of magnetic nanoparticles coated by oleic acid applied to solvent extraction processes

Cited by 22 publications

References 20 publications

Synthesis of Fe3O4/Ag nanohybrid ferrofluids and their applications as antimicrobial and antifibrotic agents

Synthesis of Fe3O4/Ag nanohybrid ferrofluids and their applications as antimicrobial and antifibrotic agents

Microstructural Assessment of Magnetite Nanoparticles (Fe3O4) Obtained by Chemical Precipitation Under Different Synthesis Conditions

Characterization and Chemical Stability of Hydrophilic and Hydrophobic Magnetic Nanoparticles

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