EFFECTS OF INTERACTION OF ORGANIC AND INORGANIC P WITH FERRIHYDRITE AND KAOLINITE-IRON OXIDE SYSTEMS ON IRON RELEASE

Soil Science ◽  
2003 ◽  
Vol 168 (7) ◽  
pp. 479-488 ◽  
Author(s):  
Luisella Celi ◽  
Giovanni De Luca ◽  
Elisabetta Barberis
Keyword(s):  
Iron Oxide ◽  
Iron Release ◽  
Oxide Systems ◽  
Inorganic P

Phosphate aggravates iron chlorosis in sensitive plants grown on model calcium carbonate−iron oxide systems

2013 ◽  
Vol 373 (1-2) ◽  
pp. 31-42 ◽  
Author(s):  
Antonio Rafael Sánchez-Rodríguez ◽  
María Carmen del Campillo ◽  
José Torrent
Keyword(s):  
Iron Oxide ◽  
Calcium Carbonate ◽  
Iron Chlorosis ◽  
Oxide Systems

Cation Exchange in Kaolinite-Iron Oxide Systems*

1962 ◽  
Vol 11 (1) ◽  
pp. 321-326 ◽  
Author(s):  
Grant W. Thomas
Keyword(s):  
Iron Oxide ◽  
Cation Exchange ◽  
Oxide Systems

A Mössbauer study of magnetic relaxation and the Morin transition in amorphous and crystalline iron oxide systems

1986 ◽  
Vol 59 (3-4) ◽  
pp. 301-308 ◽  
Author(s):  
J. Chadwick ◽  
D.H. Jones ◽  
M.F. Thomas ◽  
G.J. Tatlock ◽  
R.W. Devenish
Keyword(s):  
Iron Oxide ◽  
Magnetic Relaxation ◽  
Morin Transition ◽  
Mössbauer Study ◽  
Oxide Systems

Synthesis and Characterization of Iron Oxide Nanostructured Particles in Na–Y Zeolite Matrix

2004 ◽  
Vol 19 (3) ◽  
pp. 930-936 ◽  
Author(s):  
Maxine Yee ◽  
Iskandar I. Yaacob
Keyword(s):  
Iron Oxide ◽  
Fine Particles ◽  
Gas Adsorption ◽  
Morphological Changes ◽  
X Ray Diffraction ◽  
Oxide Systems ◽  
Nanostructured Particles ◽  
Transmission Electron ◽  
Xrd Patterns ◽  
Adsorption Desorption

Formation of iron oxide nanoparticles within the internal cages of Na–Y zeolites was investigated. Sodium ions within the zeolites were replaced with iron(II) ions. Elemental composition studies showed a significant amount of iron in the exchanged sample. NaOH and dropwise additions of H2O2 at 60 °C triggered formation of zeolite–iron oxide systems. X-ray diffraction (XRD) patterns showed diminishing zeolite peaks along with evolution of peaks corresponding to γ-Fe2O3 and α-Fe2O3 with increasing NaOH concentration. Morphological changes from hexagonal-shaped zeolite to clusters of fine particles were observed under scanning electron microscope. Particles with about 15-nm diameter were detected by transmission electron microscopy. γ-Fe2O3 crystallites of 13.4 nm were determined from the broadening of XRD peaks. The magnetization curves of samples (precipitated using NaOH with concentrations of 2.0 M and above) showed absence of hysteresis and passed through the origin, indicating the particles are superparamagnetic. Gas adsorption–desorption measurement of the system precipitated with 2.0 M NaOH revealed a 26% increase in its specific surface area, indicating the presence of nanometer-sized particles within the zeolites.

Microstructure of Rapidly Quenched Bismuth Iron Oxide Systems with Ferromagnetic Character

1991 ◽  
Vol 30 (Part 2, No. 12B) ◽  
pp. L2095-L2097 ◽  
Author(s):  
Katsuhisa Tanaka ◽  
Kazuyuki Hirao ◽  
Naohiro Soga ◽  
Hirotaro Mori
Keyword(s):  
Iron Oxide ◽  
Bismuth Iron Oxide ◽  
Oxide Systems ◽  
Ferromagnetic Character

Interactions in Sulphur Oxide-Iron Oxide Systems

1967 ◽  
Vol 89 (2) ◽  
pp. 297-303 ◽  
Author(s):  
A. Levy ◽  
E. L. Merryman
Keyword(s):  
Iron Oxide ◽  
Protective Effect ◽  
Gas Mixtures ◽  
Oxide Systems ◽  
Sulphur Oxide

Fe2O3-, Fe3O4-, NaOH-Fe2O3-, and NaOH-Fe3O4-coated substrates of Vycor and of iron were exposed to controlled gas mixtures containing SO2 and SO3. Sulfate and sulfide formation are examined and explained on thermodynamic grounds. Examination of the role of MgO coatings indicates a limited “protective” effect through its removal of SO3 from the gas stream.

scholarly journals Superparamagnetic Iron Oxide Nanoparticles Modified with Silica Layers as Potential Agents for Lung Cancer Treatment

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1076 ◽  
Author(s):  
Katarzyna Reczyńska ◽  
Marta Marszałek ◽  
Arkadiusz Zarzycki ◽  
Witold Reczyński ◽  
Kamil Kornaus ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
A549 Cells ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Lung Epithelial Cells ◽  
Bet Surface Area ◽  
Oxide Nanoparticles ◽  
Iron Release ◽  
Silica Layers

Superparamagnetic iron oxide nanoparticles (SPIONs) are promising drug delivery carriers and hyperthermia agents for the treatment of cancer. However, to ensure their safety in vivo, SPIONs must be modified in order to prevent unwanted iron release. Thus, SPIONs were coated with silica layers of different morphologies: non-porous (@SiO2), mesoporous (@mSiO2) or with a combination of non-porous and mesoporous layers (@SiO2@mSiO2) deposited via a sol–gel method. The presence of SiO2 drastically changed the surface properties of the nanoparticles. The zeta potential changed from 19.6 ± 0.8 mV for SPIONs to −26.1 ± 0.1 mV for SPION@mSiO2. The Brunauer–Emmett–Teller (BET) surface area increased from 7.54 ± 0.02 m2/g for SPIONs to 101.3 ± 2.8 m2/g for SPION@mSiO2. All types of coatings significantly decreased iron release (at least 10 fold as compared to unmodified SPIONs). SPIONs and SPION@mSiO2 were tested in vitro in contact with human lung epithelial cells (A549 and BEAS-2B). Both nanoparticle types were cytocompatible, although some delay in proliferation was observed for BEAS-2B cells as compared to A549 cells, which was correlated with increased cell velocity and nanoparticles uptake.

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