Determination of Activation Energy for the Diffusion of Fe3+ Ions in Agar Gel Medium Containing Various Transition Metal Sulfates

Rajurkar, N. S.; Kute, Mohini

doi:10.1007/s10953-009-9485-1

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The activation energy is close to the value for iron oxidation process in a sulfuric acid solution [ 67 , 68 ] or ferrous diffusion in chloride [ 69 ]. The obtained value is also close to the activation energy of silver diffusion in ferric sulfate [ 70 ] and ferric diffusion in various sulfate solutions [ 71 ]. This value is typical of a reaction whose kinetics are diffusion-controlled processes [ 70 ].…”

Section: Resultssupporting

confidence: 79%

Template-Assisted Iron Nanowire Formation at Different Electrolyte Temperatures

et al. 2021

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We studied the morphology, structure, and magnetic properties of Fe nanowires that were electrodeposited as a function of the electrolyte temperature. The nucleation mechanism followed instantaneous growth. At low temperatures, we observed an increase of the total charge reduced into the templates, thus suggesting a significant increase in the degree of pore filling. Scanning electron microscopy images revealed smooth nanowires without any characteristic features that would differentiate their morphology as a function of the electrolyte temperature. X-ray photoelectron spectroscopy studies indicated the presence of a polycarbonate coating that covered the nanowires and protected them against oxidation. The X-ray diffraction measurements showed peaks coming from the polycrystalline Fe bcc structure without any traces of the oxide phases. The crystallite size decreased with an increasing electrolyte temperature. The transmission electron microscopy measurements proved the fine-crystalline structure and revealed elongated crystallite shapes with a columnar arrangement along the nanowire. Mössbauer studies indicated a deviation in the magnetization vector from the normal direction, which agrees with the SQUID measurements. An increase in the electrolyte temperature caused a rise in the out of the membrane plane coercivity. The studies showed the oxidation resistance of the Fe nanowires deposited at elevated electrolyte temperatures.

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Section: Resultssupporting

confidence: 79%

Template-Assisted Iron Nanowire Formation at Different Electrolyte Temperatures

et al. 2021

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“…1. As can be seen from this figure, the diffusion coefficient decreases linearly with the weight fraction of agar, which obeys the following equation 12,13 .…”

Section: Resultsmentioning

confidence: 67%

Diffusion of Fe3+ Ions in Agar Gel Medium Containing Zinc Sulfate: Obstruction effect and Activation Energy

Gupte

2023

J. ISAS

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The paper presents a study on the diffusion behaviour of ferric ions within an agar gel medium containing zinc sulfate electrolyte. Investigations for various aspects, including the obstruction effect introduced by the agar gel, the validation of Wang's diffusion model, and the suitability of applying transition state theory to the diffusion of Fe3+ ions in an agar gel medium with zinc sulfate were made. This investigation involved optimising the gel concentration, electrolyte concentration, and system temperature. The diffusion coefficients are determined by the zone diffusion technique. The results reveal that the activation energy (E) decreases as the electrolyte concentration increases, aligning with Wang's model. This decrease is attributed to the disruption of the water structure induced by ions and agar molecules. Additionally, for a fixed electrolyte concentration, the activation energy decreases with the cubic root of the weight percent of agar (W1/3), while the diffusion coefficient (Do) decreases with the square of the reciprocal of the weight percent of agar (W-2/3). This behaviour is consistent with the principles of the transition state theory of diffusion.

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Determination of Activation Energy for the Diffusion of Fe3+ Ions in Agar Gel Medium Containing Various Transition Metal Sulfates

Cited by 2 publications

References 15 publications

Template-Assisted Iron Nanowire Formation at Different Electrolyte Temperatures

Template-Assisted Iron Nanowire Formation at Different Electrolyte Temperatures

Diffusion of Fe3+ Ions in Agar Gel Medium Containing Zinc Sulfate: Obstruction effect and Activation Energy

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