Electric Double Layered Magnetic Fluids (EDL-MF) based on spinel ferrite nanostructures [(M1-x+2Fex+3)]A [(Fe2-x+3 Mx+2)]BO4-2

Tourinho, F.A.; Depeyrot, J.; Silva, G.J. da; Lara, Márcia

doi:10.1590/s0103-97331998000400016

Cited by 26 publications

(10 citation statements)

References 3 publications

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“…Furthermore, the intensity of an absorption peak depends on the path length, concentration, and strength of the absorption band. 20,21 In this research, after radiation, two C-H stretching vibrations became merged and appeared as a single vibration in all groups; this was due to the increased peak width. The shift of this band could be attributed to the weakening of hydrogen bonds.…”

Section: Resultsmentioning

confidence: 61%

Characterization of Gamma-Irradiated <i>Rosmarinus officinalis</i> L. (Rosemary)

Rezanejad

Ojagh

Heidarieh

et al. 2019

tjps

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ÖZAmaç: Lamiaceae familyası bitkisi olan Rosmarinus officinalis L., en yüksek antioksidan aktiviteye sahip baharat olarak kabul edilmektedir.Gereç ve Yöntemler: Bu çalışmada, gama ışınlarıyla ışınlanmış biberiyenin nanoyapılarının fizikokimyasal özellikleri transmisyon elektron mikroskobu, X-ışını difraksiyonu ve fourier dönüşümü kızılötesi spektroskopisi (FTIR) kullanılarak incelenmiştir.Bulgular: Bir kobalt-60 ışınlayıcıda 30 kGy'de ışınlama altında hazırlanan gama ışınlanmış biberiyenin partikül büyüklüğü dağılımı, ortalama büyüklüğü 70 nm olan çok dar bir boyut dağılımı sergilemiştir. Sonuçlar, ışınlanmış (30 kGy) ve ham biberiyenin, tipik fenol bileşiğinin, fonksiyonel gruplara ilişkin bantlarda kayda değer bir değişiklik göstermeden benzer FTIR spektrum paternine sahip olduğunu göstermiştir. 50 kGy ve 10 kGy ile ışınlanmış biberiye sırasıyla en yüksek ve en düşük kristallenme özelliği gösterdi. Işınlanmış örneklerin kristallenme özelliğinin, ışınlanmamış numuneye kıyasla daha düşük olduğu belirlendi.Sonuç: Bu nedenle, 30 kGy'nin ortalama boyutu 70 nm olan nanopartiküllerin sentezi için ideal olduğu, ışınlanmamış örnekler ile karşılaştırıldığında düşük kristallenme ve bantlardaki kayda değer olmayan değişikliklere neden olduğu belirlenmiştir.Anahtar kelimeler: Biberiye, gama radyasyon, FTIR, transmisyon elektron mikroskobu, nanopartikül, X-ışını difraksiyonu Objectives: Rosmarinus officinalis L., a member of the family Lamiaceae, is regarded as the spice with the highest antioxidant activity. Materials and Methods:In this study, the transmission electron microscopy, X-ray diffraction, and fourier transform infrared spectroscopy (FTIR) physicochemical characteristics of the nanostructure of gamma-irradiated rosemary were investigated. Results:The particle size distribution of the gamma-irradiated rosemary prepared under irradiation at 30 kGy in a Cobalt-60 irradiator exhibited a very narrow size distribution with average size of 70 nm. The results showed that irradiated (30 kGy) and crude rosemary had similar patterns of FTIR spectra, typical of phenol compound, without any notable changes in the key bands and functional groups status. Rosemary irradiated with 50 kGy and 10 kGy showed the highest and lowest crystallinity, respectively. Rosemary crystallinity of irradiated samples was lower compared with the nonirradiated sample.Conclusion: Therefore, 30 kGy can be optimum for the synthesis of nanoparticles, average size of 70 nm, with low crystallinity and without any notable change in key bands compared to nonirradiated samples.

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Section: Resultsmentioning

confidence: 61%

Characterization of Gamma-Irradiated <i>Rosmarinus officinalis</i> L. (Rosemary)

Rezanejad

Ojagh

Heidarieh

et al. 2019

tjps

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“…Thus, to realize low bioload therapies with magnetic NPs, it is desirable to develop monodisperse Fe 3 O 4 NPs with high dispersion stability without the need for any additional surfactant. Until now, it is reported that electric double layered (EDL) magnetic fluids as surfactant-free water-based ferrofluids show excellent exothermic properties. , EDL magnetic fluids have been studied for many years , and are expected to be a good candidate for magnetic fluid hyperthermia applications because they show excellent stability by an electrostatic repulsion at low pH values without any surfactant. However, Pilati et al also reported that EDL is strongly affected by pH and destabilizes to form aggregates in neutral solution .…”

Section: Introductionmentioning

confidence: 99%

Water-Dispersible Fe₃O₄ Nanoparticles Modified with Controlled Numbers of Carboxyl Moieties for Magnetic Induction Heating

Yachi

Matsubara

Shen

et al. 2021

ACS Appl. Nano Mater.

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Monodisperse Fe3O4 nanoparticles (NPs) with excellent water dispersibility and stability were prepared by the introduction of the carboxyl group (−COOH) on the surface of the as-prepared oleyl-capped Fe3O4 NPs. Controlled introduction of the COOH moieties on the NP surface was carried out by a simple ligand exchange reaction using two types of phosphonic acid ligands with dodecyl moiety and the terminal COOH group. The degree of modification of the COOH group on the particle surface was controlled by tuning the molar ratios of the two phosphonic acids. During the ligand exchange reaction, no change was observed in the crystal structure and morphology of the Fe3O4 NPs. The results of Fourier transform infrared (FT-IR) spectroscopy confirmed that the two ligands were bound to the Fe3O4 NP surface through their phosphoric acid functional groups. The surface coverage and molar ratios of the two ligands were evaluated by thermal gravimetric analysis (TGA) and via proton nuclear magnetic resonance (1H NMR) measurements, respectively. Results obtained from the thermal analyses were consistent with the initial molar ratios of the ligands used in the reaction, which reflect on the efficiency of the developed ligand exchange process. Our COOH-modified Fe3O4 NPs could be dispersed in water by deprotonation for over 6 months and exhibit a typical ferrofluid behavior without the addition of other surfactants and dispersants, showing high dispersion stability. Furthermore, the magnetic induction heating performance of the Fe3O4 NPs in aqueous dispersions was evaluated and the specific absorption rate (SAR) value was estimated to be 38.3 W/g Fe. These results suggest that our COOH-modified Fe3O4 NPs with the desired number of COOH surface moieties can be advantageous for applications such as precise surface design, water-based ferrofluid, and hyperthermia treatment.

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“…In this regard, using MNPs in controlling bacterial infection is carried out by many researchers [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Iron oxides are somewhat stable against oxidation and have a significant magnetisation, and also due to their lack of toxicity being preferred in various uses [11,20,21]. Superparamagnetic NPs have been extremely studied due to their varied applications, in both physico-chemical and biomedical fields.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of antibacterial property of hydroxyapatite and zirconium oxide‐modificated magnetic nanoparticles against Staphylococcus aureus and Escherichia coli

Goudarzi

Bagherzadeh

Fazilati

et al. 2019

IET nanobiotechnol.

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In the first section of this research, superparamagnetic nanoparticles (NPs) (Fe 3 O 4) modified with hydroxyapatite (HAP) and zirconium oxide (ZrO 2) and thereby Fe 3 O 4 /HAP and Fe 3 O 4 /ZrO 2 NPs were synthesised through co-precipitation method. Then Fe 3 O 4 /HAP and Fe 3 O 4 /ZrO 2 NPs characterised with various techniques such as X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller, Fourier transform infrared, and vibrating sample magnetometer. Observed results confirmed the successful synthesis of desired NPs. In the second section, the antibacterial activity of synthesised magnetic NPs (MNPs) was investigated. This investigation performed with multiple microbial cultivations on the two bacteria; Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). Obtained results proved that although both MNPs have good antibacterial properties, however, Fe 3 O 4 /HAP NP has greater antibacterial performance than the other. Based on minimum inhibitory concentration and minimum bactericidal concentration evaluations, S. aureus bacteria are more sensitive to both NPs. These nanocomposites combine the advantages of MNP and antibacterial effects, with distinctive merits including easy preparation, high inactivation capacity, and easy isolation from sample solutions by the application of an external magnetic field.

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Electric Double Layered Magnetic Fluids (EDL-MF) based on spinel ferrite nanostructures [(M1-x+2Fex+3)]A [(Fe2-x+3 Mx+2)]BO4-2

Cited by 26 publications

References 3 publications

Characterization of Gamma-Irradiated <i>Rosmarinus officinalis</i> L. (Rosemary)

Characterization of Gamma-Irradiated <i>Rosmarinus officinalis</i> L. (Rosemary)

Water-Dispersible Fe₃O₄ Nanoparticles Modified with Controlled Numbers of Carboxyl Moieties for Magnetic Induction Heating

Evaluation of antibacterial property of hydroxyapatite and zirconium oxide‐modificated magnetic nanoparticles against Staphylococcus aureus and Escherichia coli

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Electric Double Layered Magnetic Fluids (EDL-MF) based on spinel ferrite nanostructures [(M1-x+2Fex+3)]A [(Fe2-x+3 Mx+2)]BO4-2

Cited by 26 publications

References 3 publications

Characterization of Gamma-Irradiated <i>Rosmarinus officinalis</i> L. (Rosemary)

Characterization of Gamma-Irradiated <i>Rosmarinus officinalis</i> L. (Rosemary)

Water-Dispersible Fe3O4 Nanoparticles Modified with Controlled Numbers of Carboxyl Moieties for Magnetic Induction Heating

Evaluation of antibacterial property of hydroxyapatite and zirconium oxide‐modificated magnetic nanoparticles against Staphylococcus aureus and Escherichia coli

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Product

Resources

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Water-Dispersible Fe₃O₄ Nanoparticles Modified with Controlled Numbers of Carboxyl Moieties for Magnetic Induction Heating