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

Polyelectrolyte multilayer capsules are synthesized comprising of 12 total layers each containing a single layer of iron oxide nanoparticles in shells 4, 6, 8 or 10. A protein-labelled dye is embedded in the calcium carbonate template core as a model for the encapsulation of a drug. The core is dissolved after 6 layers are formed. Two types of magnetic nanoparticles are incorporated into various capsule shells: ferric oxide (Fe2O3, 50 nm) and iron oxide (Fe3O4, 15 nm), a 1:1 (vol.) mixture of the two types of nanoparticles suspensions is also used. Nanoparticle inclusion reduces the capsule sizes in all cases with the order of effect Fe3O4 [ Fe2O3 [ Fe2O3/Fe3O4 mixture. When Fe3O4 or a Fe2O3/Fe3O4 mixture is incorporated in layer 6 the reduction in size of the final capsules is less than expected. The number of surviving capsules containing nanoparticles are lower than control regardless of which of the nanoparticles is used but here the effect of Fe3O4 or a mixture of the two types of nanoparticles incorporated in layer 6 was slightly out of step. The amount of iron incorporated is almost the same regardless of which shell the nanoparticles were incorporated but the iron content using 50 nm nanoparticles is generally slightly higher than that obtained with 15 nm nanoparticles.

Download Full-text

Cation Exchange in Kaolinite-Iron Oxide Systems*

Clays and Clay Minerals ◽

10.1346/ccmn.1962.0110132 ◽

1962 ◽

Vol 11 (1) ◽

pp. 321-326 ◽

Cited By ~ 2

Author(s):

Grant W. Thomas

Keyword(s):

Iron Oxide ◽

Cation Exchange ◽

Oxide Systems

Download Full-text

Do iron oxide systems influence soil properties and nitrogen transformations in soils under wetland rice‐based cropping systems?

Communications in Soil Science and Plant Analysis ◽

10.1080/00103628709367804 ◽

1987 ◽

Vol 18 (1) ◽

pp. 83-113 ◽

Cited By ~ 7

Author(s):

N. K. Savant ◽

G. H. McClellan

Keyword(s):

Iron Oxide ◽

Soil Properties ◽

Cropping Systems ◽

Wetland Rice ◽

Nitrogen Transformations ◽

Oxide Systems

Download Full-text

Satellite imagery and spectral matching for improved estimation of calcium carbonate and iron oxide abundance in mine areas

Arabian Journal of Geosciences ◽

10.1007/s12517-020-05859-w ◽

2020 ◽

Vol 13 (18) ◽

Author(s):

Padma SrinivasaPerumal ◽

Sanjeevi Shanmugam ◽

Pradeep Ganapathi

Keyword(s):

Iron Oxide ◽

Calcium Carbonate ◽

Satellite Imagery ◽

Spectral Matching

Download Full-text

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

Journal of Magnetism and Magnetic Materials ◽

10.1016/0304-8853(86)90425-7 ◽

1986 ◽

Vol 59 (3-4) ◽

pp. 301-308 ◽

Cited By ~ 6

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

Download Full-text

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

Journal of Materials Research ◽

10.1557/jmr.2004.19.3.930 ◽

2004 ◽

Vol 19 (3) ◽

pp. 930-936 ◽

Cited By ~ 7

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.

Download Full-text