The impact of Mn oxide coatings on Zn distribution

2006 ◽  
Vol 298 (2) ◽  
pp. 615-623 ◽  
Author(s):  
Thipnakarin Boonfueng ◽  
Lisa Axe ◽  
Ying Xu ◽  
Trevor A. Tyson
Keyword(s):  
Oxide Coatings ◽  
Mn Oxide ◽  
Zn Distribution ◽  
The Impact

Changes in clay organization due to structural iron reduction in a flooded vertisol

Clay Minerals ◽  
2004 ◽  
Vol 39 (2) ◽  
pp. 123-134 ◽  
Author(s):  
F. Favre ◽  
A. M. Jaunet ◽  
M. Pernes ◽  
M. Badraoui ◽  
P. Boivin ◽  
...  
Keyword(s):  
Iron Reduction ◽  
Clay Fraction ◽  
Exchange Capacity ◽  
Oxide Coatings ◽  
Lateral Extension ◽  
Stacking Order ◽  
Transmission Electron ◽  
Induced Changes ◽  
Structural Iron ◽  
The Impact

AbstractThe purpose of this study was to investigate the impact of redox-induced changes in the organization of the clay fraction of a bulk vertisol using transmission electron microscopy. Chemical and X-ray powder diffraction (XRD) analyses indicated that the oxidized clay was composed of 32% kaolinite and 68% non-pure smectitic material, mostly a dioctahedral beidellite with octahedral Fe, according to Quantarg2 and DecompXR models.The cation exchange capacity of the soil increased from 26.1 to 65 cmolc+ kg-1 due to structural iron (FeStr) reduction and dissolution of oxide coatings. Transmission electron micrographs revealed dramatic changes upon reduction. Oxides were dissolved and the smectite increased in particle darkness, lateral extension, thickness, compactness and stacking order. These changes were interpreted to be a consequence of sorption of ferrous Fe and reduction of FeStr, as found in previous studies on pure Fe-bearing smectites.

The determination of trace elements in Fe–Mn oxide coatings on pebbles using LA-ICP-MS

2006 ◽  
Vol 91 (1-3) ◽  
pp. 110-124 ◽  
Author(s):  
Sheldon R. Huelin ◽  
Henry P. Longerich ◽  
Derek H.C. Wilton ◽  
Brian J. Fryer
Keyword(s):  
Trace Elements ◽  
Oxide Coatings ◽  
Mn Oxide ◽  
Icp Ms

The impact of the mass density on selected optical and non-optical properties of oxide coatings

2014 ◽  
Vol 3 (1) ◽  
Author(s):  
Olaf Stenzel
Keyword(s):  
Silicon Dioxide ◽  
Zirconium Oxide ◽  
Hafnium Oxide ◽  
Optical Constants ◽  
Mass Density ◽  
Tantalum Pentoxide ◽  
Optical Coatings ◽  
Oxide Coatings ◽  
Numerous Experimental Data ◽  
The Impact

AbstractThe density of optical coatings is one of the most crucial material-related parameters in interference coating science and technology. It has an impact on the refractive index, the transparency range, and the mechanical stress of a coating material. This tutorial provides a background on the classical theory relating the coating density to the mentioned parameters. Simple models are presented that highlight the correlations between optical constants, stress, and shifting behavior of different oxide coatings. Comparison with the experiment is performed on the basis of numerous experimental data, which stem from hafnium oxide, zirconium oxide, tantalum pentoxide, and silicon dioxide.

Zn sorption mechanisms onto sheathed Leptothrix discophora and the impact of the nanoparticulate biogenic Mn oxide coating

2009 ◽  
Vol 333 (2) ◽  
pp. 439-447 ◽  
Author(s):  
Thipnakarin Boonfueng ◽  
Lisa Axe ◽  
Nathan Yee ◽  
Dittmar Hahn ◽  
Peter K. Ndiba
Keyword(s):  
Oxide Coating ◽  
Leptothrix Discophora ◽  
Mn Oxide ◽  
Biogenic Mn Oxide ◽  
Sorption Mechanisms ◽  
The Impact

scholarly journals The Effect of Anodization on the Mechanical Properties of AA6061 Produced by Additive Friction Stir-Deposition

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1773
Author(s):  
Ning Zhu ◽  
Dustin Z. Avery ◽  
Ben A. Rutherford ◽  
Brandon J. Phillips ◽  
Paul G. Allison ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Layer ◽  
Frictional Heating ◽  
Oxide Coating ◽  
Surface Oxide Layer ◽  
Oxide Coatings ◽  
Friction Stir ◽  
Oxide Particles ◽  
The Impact ◽  
Feedstock Material

This paper examines the impact of oxide coatings on the surfaces of feedstock material used for Additive Friction Stir-Deposition (AFS-D). The AFS-D is a solid-state additive manufacturing process that uses severe plastic deformation and frictional heating to build bulk depositions from either metallic rod or powder feedstock. Since aluminum alloys naturally form an oxide layer, it is important to determine the influence of the feedstock surface oxide layer on the resultant as-deposited microstructure and mechanical properties. In this study, three AA6061 square-rod feedstock materials were used, each with a different thickness of aluminum oxide coating: non-anodized, 10-micron thick, and 68-micron thick. Macroscale depositions were produced with these feedstock rods using the AFS-D process. Optical and electron microscopy showed that the two oxide coatings applied through anodization were efficiently dispersed during the AFS-D process, with oxide particles distributed throughout the microstructure. These oxide particles had median sizes of 1.8 and 3 μm2, respectively. The yield and tensile strengths of these materials were not measurably impacted by the thickness of the starting oxide coating. While all three feedstock material variations failed by ductile rupture, the elongation-to-failure did decrease from 68% to 55% in the longitudinal direction and from 60% to 43% in the build direction for the thickest initial oxide coating, 68 microns.

scholarly journals Removal of mercury (II) from aqueous solutions by multiwalled carbon nanotubes coated with manganese oxide

2019 ◽  
Vol 21 (6) ◽  
pp. 258-264
Author(s):  
Abbas Khodabakhshi ◽  
Hassan Asgarian
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Structural Characteristics ◽  
Initial Density ◽  
High Concentration ◽  
Nano Composite ◽  
Mn Oxide ◽  
The Impact

Background and aims: Water pollution by heavy metals is one of the most important environmental problems. Among the heavy metals, mercury (Hg) is a very toxic metal and its high concentration can lead to impaired pulmonary and renal dysfunction. The aim of this study was to determine the amount of Hg removal by carbon nanotubes coated with manganese (Mn) oxide from aqueous solutions. Methods: In this study, multi-walled carbon nanotubes coated with Mn oxide were prepared and used to remove Hg from aqueous environments. In addition, the physical and structural characteristics of the nanotubes were determined by the X-ray diffraction (XRD). The impact of diverse variables was further investigated, including the initial concentration of Hg, the initial pH of the solution, contact time, mixing rate, as well as the amount of nano-composite and the impacts of confounders (nitrate and chloride). Finally, optimum conditions for each of these parameters were obtained by the Taguchi statistical method. Results: The XRD analysis showed that the nanotubes were properly coated with Mn oxide. Furthermore, the results demonstrated that under pH 7, the rate of mixing of 150 rpm, the contact time of 60 minutes, the amount of nano-composite of 60 mg, and the initial density of Hg 80 mg/L can be achieved by removing 95% Hg. Moreover, the confounder factors of nitrate and chloride reduced the amount of Hg removal by 4 and 5%, respectively. Conclusion: Based on the results, the nanotubes coated with Mn oxide can be used as easy and strong absorbents for the rapid absorption of Hg from drinking water and industrial wastewater.

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