Water self-diffusion coefficient determination in an ion exchange membrane by optical measurement

1990 ◽  
Vol 41 (78) ◽  
pp. 1673-1684 ◽  
Author(s):  
H. R. Zelsmann ◽  
M. Pineri ◽  
M. Thomas ◽  
M. Escoubes
Keyword(s):  
Diffusion Coefficient ◽  
Ion Exchange ◽  
Optical Measurement ◽  
Ion Exchange Membrane ◽  
Self Diffusion ◽  
Exchange Membrane ◽  
Self Diffusion Coefficient

Theory of the formation of the electric double layer at the ion exchange membrane–solution interface

2015 ◽  
Vol 17 (7) ◽  
pp. 5207-5218 ◽  
Author(s):  
A. A. Moya
Keyword(s):  
Dielectric Constant ◽  
Diffusion Coefficient ◽  
Ion Exchange ◽  
Double Layer ◽  
Electric Double Layer ◽  
Ion Exchange Membrane ◽  
Poisson Equations ◽  
Solution Interface ◽  
Exchange Membrane

The study of the formation of the electric double layer at the membrane–solution interface based on the Nernst–Planck and Poisson equations including different diffusion coefficient and dielectric constant values in the solution and membrane phases.

The role of ion exchange membrane in vanadium oxygen fuel cell

2021 ◽  
Vol 629 ◽  
pp. 119271
Author(s):  
Jiří Charvát ◽  
Petr Mazúr ◽  
Martin Paidar ◽  
Jaromír Pocedič ◽  
Jiří Vrána ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Exchange Membrane ◽  
Oxygen Fuel

scholarly journals Effect of Modification on the Fluid Diffusion Coefficient in Silica Nanochannels

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4030
Author(s):  
Gengbiao Chen ◽  
Zhiwen Liu
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Surface Effect ◽  
Bulk Water ◽  
Self Diffusion ◽  
Average Diffusion Coefficient ◽  
Average Diffusion ◽  
Chain Lengths ◽  
Fluid Diffusion ◽  
Self Diffusion Coefficient

The diffusion behavior of fluid water in nanochannels with hydroxylation of silica gel and silanization of different modified chain lengths was simulated by the equilibrium molecular dynamics method. The diffusion coefficient of fluid water was calculated by the Einstein method and the Green–Kubo method, so as to analyze the change rule between the modification degree of nanochannels and the diffusion coefficient of fluid water. The results showed that the diffusion coefficient of fluid water increased with the length of the modified chain. The average diffusion coefficient of fluid water in the hydroxylated nanochannels was 8.01% of the bulk water diffusion coefficient, and the diffusion coefficients of fluid water in the –(CH2)3CH3, –(CH2)7CH3, and –(CH2)11CH3 nanochannels were 44.10%, 49.72%, and 53.80% of the diffusion coefficients of bulk water, respectively. In the above four wall characteristic models, the diffusion coefficients in the z direction were smaller than those in the other directions. However, with an increase in the silylation degree, the increased self-diffusion coefficient due to the surface effect could basically offset the decreased self-diffusion coefficient owing to the scale effect. In the four nanochannels, when the local diffusion coefficient of fluid water was in the range of 8 Å close to the wall, Dz was greater than Dxy, and beyond the range of 8 Å of the wall, the Dz was smaller than Dxy.

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