Adsorption phenomena and magnetic properties of γ-Fe2O3 nanoparticles

Prodan, D.; Chanéac, Corinne; Tronc, E.; Jolivet, Jean‐Pierre; Cherkaour, R.; Ezzir, A.; Noguès, M.; Dormann, J.L.

doi:10.1016/s0304-8853(99)00189-4

Cited by 32 publications

(32 citation statements)

References 6 publications

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“…[1][2][3][4][5] Because of their exceptional properties, researchers have attempted to use such nanoparticles for tumor inhibition, 6 dual-functional probes, 7 and antibacterial agents. 6 Although different biomedical applications for various iron oxide MNPs (such as drug delivery, 7 cellular labeling/cell separation, 8 tissue repair, 9 magnetic resonance imaging, 9 and magnetic hyperthermia) 10 have been studied by several research groups, it is essential to determine their toxicity in animal models.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and antimicrobial activity of an ampicillin-conjugated magnetic nanoantibiotic for medical applications

Hussein‐Al‐Ali¹,

Zowalaty²,

Hussein³

et al. 2014

IJN

104

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Because of their magnetic properties, magnetic nanoparticles (MNPs) have numerous diverse biomedical applications. In addition, because of their ability to penetrate bacteria and biofilms, nanoantimicrobial agents have become increasingly popular for the control of infectious diseases. Here, MNPs were prepared through an iron salt coprecipitation method in an alkaline medium, followed by a chitosan coating step (CS-coated MNPs); finally, the MNPs were loaded with ampicillin (amp) to form an amp-CS-MNP nanocomposite. Both the MNPs and amp-CS-MNPs were subsequently characterized and evaluated for their antibacterial activity. X-ray diffraction results showed that the MNPs and nanocomposites were composed of pure magnetite. Fourier transform infrared spectra and thermogravimetric data for the MNPs, CS-coated MNPs, and amp-CS-MNP nanocomposite were compared, which confirmed the CS coating on the MNPs and the amp-loaded nanocomposite. Magnetization curves showed that both the MNPs and the amp-CS-MNP nanocomposites were superparamagnetic, with saturation magnetizations at 80.1 and 26.6 emu g −1 , respectively. Amp was loaded at 8.3%. Drug release was also studied, and the total release equilibrium for amp from the amp-CS-MNPs was 100% over 400 minutes. In addition, the antimicrobial activity of the amp-CS-MNP nanocomposite was determined using agar diffusion and growth inhibition assays against Gram-positive bacteria and Gram-negative bacteria, as well as Candida albicans . The minimum inhibitory concentration of the amp-CS-MNP nanocomposite was determined against bacteria including Mycobacterium tuberculosis . The synthesized nanocomposites exhibited antibacterial and antifungal properties, as well as antimycobacterial effects. Thus, this study introduces a novel β-lactam antibacterial-based nanocomposite that can decrease fungus activity on demand for numerous medical applications.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and antimicrobial activity of an ampicillin-conjugated magnetic nanoantibiotic for medical applications

Hussein‐Al‐Ali¹,

Zowalaty²,

Hussein³

et al. 2014

IJN

104

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“…This means that the toxic ions can be removed effectively from the contaminated water with the proper amount of the adsorbent, which would possess more adsorption sites available for the metal ion uptake from the solution 5 . The SNIO shows higher adsorption capacity (99.2%) with the optimum dose of 2.57 g/L which is nearly six times less than the CAC (87.8% at 13.3 g/L), because the nanoparticles possess more number of micropores and mesopores and higher total surface energy than macroparticles which are more prone to adsorb the Co(II) ions on to the surface of the adsorbent in order to decrease the total free energy 4 .…”

Section: Effect Of Dose Ratementioning

confidence: 99%

“…For SNIO the optimum contact time is found to be 10 minutes for the effective removal (99.2%) of Co(II) ions, whereas for the CAC the optimum contact time is 60 minutes for the removal of 87.8% of the Co(II) ions. Within 10 minutes the SNIO shows higher adsorptive power than the CAC because the former possesses large surface area (63.87 m 2 /g), whereas the latter possesses small surface area (1.37 m 2 /g) 4 .…”

Section: Effect Of Contact Timementioning

confidence: 99%

“…Moreover at higher pH, the Co(II) ion form various complex anion, hydroxide complexes, etc. which are retarded by the negatively charged surface of the adsorbent 4 . At optimum pH the SNIO shows higher adsorption capacity of 99.2% whereas the CAC shows only 87.8%.…”

Section: Effect Of Phmentioning

confidence: 99%

“…When a particle decreases to the nanometer range, an increasing fraction of the atoms are exposed to the surface, giving rise to excess surface energy compared to macro molecules. Therefore, nanoparticles with a higher total energy should be prone to adsorb molecules onto their surfaces in order to decrease the total free energy 4 .…”

Section: Effect Of Initial Concentrationmentioning

confidence: 99%

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Adsorption Efficiency of Synthetic Nano Iron Oxide and Commercial Activated Carbon Towards the Removal of Co(II) Ions

2013

Chem Sci Trans

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Abstract:The synthetic nano iron oxide (SNIO) was synthesized by co-precipitation method and characterized by XRD, SEM, FT-IR and EDAX. Commercial activated carbon (CAC) was further activated by acid treatment in order to enhance the adsorption capacity. Batch adsorption experiments were carried out to compare the adsorption efficiency of SNIO and CAC towards the removal of Co(II) ions as a function of initial concentration, dose rate, contact time, pH and stirring speed. The results show that SNIO have higher adsorption capacity of 99.2% towards Co(II) ion whereas CAC shows only 87.8%. The amount of Co(II) ion adsorbed per unit mass (q e ) of SNIO was 19.31 mg g -1 . For CAC the amount of Co(II) ion adsorbed per unit mass (q e ) is only 3.38 mg g -1 . The equilibrium adsorption isotherm data have been tested by applying both Freundlich and Langmuir adsorption isotherm. The separation factor R was found to be 0 to 1 for both the adsorbent; it clearly indicates feasibility of adsorption.

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Oriented Growth of Nanocrystalline Gamma Ferric Oxide in Electrophoretically Deposited Films

et al.

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Adsorption phenomena and magnetic properties of γ-Fe2O3 nanoparticles

Cited by 32 publications

References 6 publications

Synthesis, characterization, and antimicrobial activity of an ampicillin-conjugated magnetic nanoantibiotic for medical applications

Synthesis, characterization, and antimicrobial activity of an ampicillin-conjugated magnetic nanoantibiotic for medical applications

Adsorption Efficiency of Synthetic Nano Iron Oxide and Commercial Activated Carbon Towards the Removal of Co(II) Ions

Oriented Growth of Nanocrystalline Gamma Ferric Oxide in Electrophoretically Deposited Films

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