Humic Acid Adsorption Onto Iron Oxide Magnetic Nano Particles in Aquious Solution

The effects of nano particles Fe3O4 addition on the superconducting and transport properties of YBa2Cu3O7-δ (YBCO) were studied. YBa2Cu3O7-δ superconductor powders were prepared by using high purity oxide powders via solid state reaction method. Nano Fe3O4 with 0.01 – 0.05 wt.% with average size 28 nm was added into YBCO. The transition temperatures (Tc) of the samples were measured by using four point probe method. The critical current (Ic) of the samples has been determined by using the 1 μV/cm criterion from 30 – 77 K. Sample with 0.02 wt.% nano Fe3O4 showed the highest Tc at 87 K. It is interesting to note the same sample also exhibited the highest Jc at 77 K up to 1683 mA/cm2. Nano Fe3O4 has acted as effective flux pinning centers in YBCO. A small amount of nano particles Fe3O4 addition has successfully improved the superconducting and transport properties of YBCO. The excessive addition of nano Fe3O4 (> 0.02 wt.%) suppressed the Tc and Jc. Overall, Jc decreases with increasing temperature (30 – 77 K) as a consequence of thermally activated flux creep. Magnetic impurities normally suppress superconductivity. However, by adding magnetic nano particles, current carrying capacity of superconductors YBCO was enhanced significantly.

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GREEN SYNTHESIS OF SUPERPARAMAGNETIC IRON OXIDE NANOPARTICLE FROM FICUS CARICA FRUIT EXTRACT, CHARACTERIZATION STUDIES AND ITS APPLICATION ON DYE DEGRADATION STUDIES

Asian Journal of Pharmaceutical and Clinical Research ◽

10.22159/ajpcr.2017.v10i3.15538 ◽

2017 ◽

Vol 10 (3) ◽

pp. 125

Author(s):

Kirubanandan Shanmugam ◽

Tharunya P ◽

Subha V ◽

Sandhaya S ◽

Renganathan S

Keyword(s):

Iron Oxide ◽

Ferrous Sulfate ◽

Dye Degradation ◽

Superparamagnetic Iron Oxide ◽

Ethanolic Extract ◽

Sulfate Solution ◽

Single Step ◽

Nano Particles ◽

Ficus Carica ◽

Fe3o4 Nps

ABSTRACTObjective: The synthesis of nanoparticles (NPs) has become a matter of great interest in recent times due to their various advantageous propertiesand applications in a variety of fields. Metal NPs are being increasingly used in many sectors, and there is growing interest in the biological andenvironmental safety of their production.Methods: In this study, iron oxide NPs (Fe3O4-NPs) were synthesized from fruits of Ficus carica using a rapid, single step and completely greenbiosynthetic method by reduction of ferrous sulfate solution with F. carica ethanolic extract. The prepared Fe3O4-NPs were investigated by X-raydiffraction, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy.Results: The report emphasizes the effect of superparamagnetic Fe3O4-NPs on the degradation rate of hazardous dyes acid blue.Conclusion: To conclude, Fe3O4-NPs were prepared from fruits of F. carica using a rapid, single step and completely green biosynthetic method byreduction of ferrous sulfate solution with F. carica ethanolic extract.Keywords: Ficus carica, Ethanolic extract, Reduction, Ferrous sulfate, Superparamagnetic iron oxide nano particles, Dye degradation.

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Effects of Iron Oxide Nano-Particles on the Intestinal Tissue of Common Carp, Cyprinus Carpio

Iranian Jornal of Toxicology ◽

10.32598/ijt.13.3.592.1 ◽

2019 ◽

Vol 13 (3) ◽

pp. 33-38

Author(s):

Shila Omidzahir ◽

◽

Maliheh Alijantabar Bayi ◽

Fatemeh Kardel ◽

Mohammad Mazandarani ◽

...

Keyword(s):

Small Intestine ◽

Iron Oxide ◽

Common Carp ◽

Cyprinus Carpio ◽

Nano Particles ◽

Iron Accumulation ◽

Intestinal Epithelial ◽

Intestinal Tissue ◽

Common Carp Cyprinus Carpio ◽

Carp Cyprinus Carpio

Background: The application of nano-particles (NPs) in various industries is growing. Since their toxicity is not clearly understood, they can cause adverse effects on the environment. The aim of this study was to evaluate the histopathological effects of iron oxide nano-particles on the small intestine of common carp, Cyprinus carpio. Methods: Four experimental treatments were designed (15 fish/treatment). Treatment 1 was the controls while Treatments 2, 3 and 4 were experimental. The experimental groups were exposed to 50, 75 and the 100 mg/L of iron oxide NPs, respectively. On days 14, 21 and 28, the fish were randomly picked from each tank, samples of the small intestine were dissected, and were examined for both the accumulation of the iron NPs and the tissue histopathologies. Results: The highest concentration of iron accumulation was detected for Treatment 3 on day 21, compared to all other treatment groups (p<0.05). However, iron accumulation in the tissue declined unexpectedly after day 21 despite the continued treatments at 100 mg/L of the iron NPs. The histopathological examinations revealed that the treatment beyond 21 days caused damages to the intestinal epithelial cells, including enterocytes, villi and the goblet cells. Conclusion: This study demonstrated that the effect of iron oxide NPs on the small intestinal tissue was dependant on the dose and duration of exposure. We conclude that the iron accumulation in the small intestine declined despite increasing the iron oxide NPs concentration and the exposure duration secondary to damages caused to the intestinal epithelial cell layer.

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