scholarly journals Formation of Fe(0)-Nanoparticles via Reduction of Fe(II) Compounds by Amino Acids and Their Subsequent Oxidation to Iron Oxides

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
K. Klačanová ◽  
P. Fodran ◽  
P. Šimon ◽  
P. Rapta ◽  
R. Boča ◽  
...  
Keyword(s):  
Amino Acids ◽  
Iron Oxide ◽  
Amino Acid ◽  
Iron Oxides ◽  
Iron Oxide Nanoparticles ◽  
Coordination Compounds ◽  
Iron Nanoparticles ◽  
Reducing Agent ◽  
Oxide Nanoparticles ◽  
Optimum Ph

Iron nanoparticles were prepared by the reduction of central Fe(II) ion in the coordination compounds with amino acid ligands. The anion of the amino acid used as a ligand acted as the reducing agent. Conditions for the reduction were very mild; the temperature did not exceed 52°C, and the optimum pH was between 9.5 and 9.7. The metal iron precipitated as a mirror on the flask or as a colloid in water. Identification of the product was carried out by measuring UV/VIS spectra of the iron nanoparticles in water. The iron nanoparticles were oxidized by oxygen yielding a mixture of iron oxides. Oxidation of Fe(0) to Fe(II) took several seconds under air. The size and properties of iron oxide nanoparticles were studied by UV/VIS, TEM investigation, RTG diffractometry, Mössbauer spectroscopy, magnetometry, thermogravimetry, and GC/MS.

Evaluation of Surface-modified Superparamagnetic Iron Oxide Nanoparticles to Optimize Bacterial Immobilization for Bio-separation with the Least Inhibitory Effect on Microorganism Activity

2020 ◽  
Vol 10 (2) ◽  
pp. 166-174
Author(s):  
Mehdi Khoshneviszadeh ◽  
Sarah Zargarnezhad ◽  
Younes Ghasemi ◽  
Ahmad Gholami
Keyword(s):  
Iron Oxide ◽  
Amino Acid ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Surface Coating ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Surface Charges ◽  
Surface Modified

Background: Magnetic cell immobilization has been introduced as a novel, facile and highly efficient approach for cell separation. A stable attachment between bacterial cell wall with superparamagnetic iron oxide nanoparticles (SPIONs) would enable the microorganisms to be affected by an outer magnetic field. At high concentrations, SPIONs produce reactive oxygen species in cytoplasm, which induce apoptosis or necrosis in microorganisms. Choosing a proper surface coating could cover the defects and increase the efficiency. Methods: In this study, asparagine, APTES, lipo-amino acid and PEG surface modified SPIONs was synthesized by co-precipitation method and characterized by FTIR, TEM, VSM, XRD, DLS techniques. Then, their protective effects against four Gram-positive and Gram-negative bacterial strains including Enterococcus faecalis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were examined through microdilution broth and compared to naked SPION. Results: The evaluation of characterization results showed that functionalization of magnetic nanoparticles could change their MS value, size and surface charges. Also, the microbial analysis revealed that lipo-amino acid coated magnetic nanoparticles has the least adverse effect on microbial strain among tested SPIONs. Conclusion: This study showed lipo-amino acid could be considered as the most protective and even promotive surface coating, which is explained by its optimizing effect on cell penetration and negligible reductive effects on magnetic properties of SPIONs. lipo-amino acid coated magnetic nanoparticles could be used in microbial biotechnology and industrial microbiology.

Novel Fe4-based metal–organic cluster-derived iron oxides/S,N dual-doped carbon hybrids for high-performance lithium storage

Nanoscale ◽  
2021 ◽  
Author(s):  
Lei Hu ◽  
Qiushi Wang ◽  
Xiandong Zhu ◽  
Tao Meng ◽  
Binbin Huang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Lithium Ion Batteries ◽  
Iron Oxides ◽  
Iron Oxide Nanoparticles ◽  
Anode Materials ◽  
High Performance ◽  
Lithium Ion ◽  
Oxide Nanoparticles ◽  
Lithium Storage ◽  
Metal Organic

Iron oxide nanoparticles embedded in S,N dual-doped carbon through pyrolysis of novel Fe4-based metal–organic clusters are fabricated and utilized as potential anode materials for lithium ion batteries in both half- and full-cells.

scholarly journals Effects of iron nanoparticles on Mentha piperita L. under salinity stress

Biologija ◽  
2017 ◽  
Vol 63 (1) ◽  
Author(s):  
Meheri Askary ◽  
Seyed Mehdi Talebi ◽  
Fariba Amini ◽  
Ali Dousti Balout Bangan
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Salinity Stress ◽  
Iron Nanoparticles ◽  
Antioxidant Activities ◽  
Nutrient Deficiency ◽  
Dry Weight ◽  
Mentha Piperita ◽  
Oxide Nanoparticles ◽  
The Impact

The progress of nanotechnology presents many nanoparticles that are important in medicine, agriculture and industry. Quickly and entirely absorbed by plants, nano-compounds and remedy their nutrient deficiency and satisfy this need. Iron oxide nanoparticles with suitable surface chemistry can be used as a rich source of iron for plants due to its gradual release of Fe in a wide pH range (pH 3 to 11). The present study investigated the impact of iron oxide nanoparticles (Fe2O3NPs in 0, 10, 20 and 30  µM concentrations) on physiological parameters of peppermint (Mentha piperita) under salt stress (0, 50, 100 and 150 mM concentrations of NaCl). Fe2O3NPs caused increases in leaf fresh weight and dry weight, phosphorus, potassium, iron, zinc, and calcium contents of the peppermint under salinity stress but did not have an effect on the sodium element. 30 µM concentration of Fe2O3NP was more impressive. Lipid peroxidation and proline contents of the peppermint under salinity decreased significantly by applying Fe2O3NPs. The maximum activities of total antioxidant enzymes (I %), catalase, superoxide dismutase, and guailcol peroxidase were observed in plants treated with 150 mM of NaCl, but application of Fe2O3NPs declined these antioxidant activities. The results suggest that the appropriate concentration of iron nanoparticles could be used for stress resistance of the peppermint.

scholarly journals Experimental Study and Numerical Solution of Poly Acrylic Acid Supported Magnetite Nanoparticles Transport in a One-Dimensional Porous Media

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. Golzar ◽  
S. F. Saghravani ◽  
M. Azhdari Moghaddam
Keyword(s):  
Porous Media ◽  
Iron Oxide ◽  
Acrylic Acid ◽  
Numerical Solution ◽  
Iron Oxide Nanoparticles ◽  
Iron Nanoparticles ◽  
Chlorinated Solvents ◽  
Oxide Nanoparticles ◽  
One Dimensional ◽  
Poly Acrylic Acid

Recently, iron nanoparticles have attracted more attention for groundwater remediation due to its potential to reduce subsurface contaminants such as PCBs, chlorinated solvents, and heavy metals. The magnetic properties of iron nanoparticles cause to attach to each other and form bigger colloid particles of iron nanoparticles with more rapid sedimentation rate in aqueous environment. Using the surfactants such as poly acrylic acid (PAA) prevents iron nanoparticles from forming large flocs that may cause sedimentation and so increases transport distance of the nanoparticles. In this study, the transport of iron oxide nanoparticles (Fe3O4) stabilized with PAA in a one-dimensional porous media (column) was investigated. The slurries with concentrations of 20,100 and 500 (mg/L) were injected into the bottom of the column under hydraulic gradients of 0.125, 0.375, and 0.625. The results obtained from experiments were compared with the results obtained from numerical solution of advection-dispersion equation based on the classical colloid filtration theory (CFT). The experimental and simulated breakthrough curves showed that CFT is able to predict the transport and fate of iron oxide nanoparticles stabilized with PAA (up to concentration 500 ppm) in a porous media.

Poly(amino acid)-coated iron oxide nanoparticles as ultra-small magnetic resonance probes

2009 ◽  
Vol 19 (26) ◽  
pp. 4566 ◽  
Author(s):  
Hee-Man Yang ◽  
Hyun Jin Lee ◽  
Kwang-Suk Jang ◽  
Chan Woo Park ◽  
Hee Won Yang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Amino Acid ◽  
Magnetic Resonance ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

A direct surface modification of iron oxide nanoparticles with various poly(amino acid)s for use as magnetic resonance probes

2013 ◽  
Vol 391 ◽  
pp. 158-167 ◽  
Author(s):  
Hee-Man Yang ◽  
Chan Woo Park ◽  
Taebin Ahn ◽  
Bokyung Jung ◽  
Bum-Kyoung Seo ◽  
...  
Keyword(s):  
Surface Modification ◽  
Iron Oxide ◽  
Amino Acid ◽  
Magnetic Resonance ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

scholarly journals Synthesis of tetrakis(carboxyphenyl)porphyrin coated paramagnetic iron oxide nanoparticles via amino acid for photodegradation of methylene blue

2013 ◽  
Vol 37 ◽  
pp. 879-888 ◽  
Author(s):  
Rahmatolah RAHIMI ◽  
Azadeh TADJARODI ◽  
Mina IMANI ◽  
Mahboubeh RABBANI ◽  
Samaneh SAFALOU MOGHADDAM ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Iron Oxide ◽  
Amino Acid ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles
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