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Multi-scale Periodic Homogenization of Ionic Transfer in Cementitious Materials

K. Bourbatache, O. Millet, A. Aїt-Mokhtar

Springer Series in Geomechanics and Geoengineering > Advances in Bifurcation and Degradation in Geomaterials > Geo-environmental Applications > 117-123

In this communication, we perform a multi-scale periodic homogenization of Nernst-Planck and Poisson-Boltzmann equations describing the ionic transfer in saturated cementitious materials. Two models of ionic transfer are established successively. The first one by periodic homogenization from the Debye length scale to the capillary porosity scale, taking into account the electrical double layer phenomenon...

article

Influence of annealing on ionic transfer and storage stability of Li2S–P2S5 solid electrolyte

Junjun Wei, Hyea Kim, Dong-Chan Lee, Renzhong Hu, more

Journal of Power Sources > 2015 > 294 > C > 494-500

In this study, the impact of annealing treatment on the ionic transfer and storage stability of 70Li₂S–30P₂S₅ glass-ceramic solid electrolyte (SE) pellets are investigated. The ionic conductivity is enhanced from 1 to 1.5 mS cm⁻¹, while the total interfacial resistance of Li/SE/Li cell is reduced by over an order of magnitude with increasing annealing temperature up to 250 °C. Higher annealing temperature...

chapter

Homogenization Methods for Ionic Transfers in Saturated Heterogeneous Materials

Olivier Millet, Khaled Bourbatache, Abdelkarim Aït‐Mokhtar

Structure Design and Degradation Mechanisms in Coastal Environments > 117 - 160

This chapter describes the use of periodic homogenization technique as a tool for a multiscale homogenization of ionic transfer in cementitious materials. The first homogenization procedure of the Nernst–Planck–Poisson (NPP) system is performed from the nanoscale (Debye length scale) to the microscale (capillary porosity scale), accounting for the electrical double layer (EDL) effects. The second...

article

Impact of surface properties of hydrated compounds based on ZrO ₂ on the value of ionic conduction

T. V. Mal’tseva, A. V. Pal’chik, E. O. Kudelko, S. L. Vasilyuk, more

Journal of Water Chemistry and Technology > 2015 > 37 > 1 > 18-24

We have measured the maximum ionic conduction in distilled water of hydrated compounds based on ZrO ₂ containing as the second component zirconium phosphate, zirconium phosphomolybdenum acid as well as hydrated aluminum oxide in a maximum saturated form after absorption of Cu(II) ions. The conduction value of ion-exchange materials constitutes 0.01–0.07 S · m ⁻¹ . Compared...

article

Development of Monopole Interaction Models for Ionic Compounds. Part I: Estimation of Aqueous Henry’s Law Constants for Ions and Gas Phase pK_a Values for Acidic Compounds

S. H. Hilal, A. N. Saravanaraj, L. A. Carreira

Molecular Informatics > 33 > 2 > 92 - 103

The SPARC (SPARC Performs Automated Reasoning in Chemistry) physicochemical mechanistic models for neutral compounds have been extended to estimate Henry’s Law Constant (HLC) for charged species by incorporating ionic electrostatic interaction models. Combinations of absolute aqueous pK_a values, relative pK_a values in the gas phase, and aqueous HLC for neutral compounds have been used to develop monopole...

article

Chloride transfer in cement‐based materials. Part 2. Experimental study and numerical simulations

K. Bourbatache, O. Millet, A. Aït‐Mokhtar, O. Amiri

International Journal for Numerical and Analytical Methods in Geomechanics > 37 > 11 > 1628 - 1641

This second part of the work deals firstly with carrying out materials characterization, mainly mercury intrusion porosimetry and chloride electrodiffusion tests on two cement pastes. Experimental data allowed fixing the perturbation parameter ϵ and other dimensionless numbers highlighted in part I of this work. Secondly, a series of parametric simulations were performed in order to compute the chloride...

article

Chloride transfer in cement‐based materials. Part 1. Theoretical basis and modelling

K. Bourbatache, O. Millet, A. Aït‐Mokhtar, O. Amiri

International Journal for Numerical and Analytical Methods in Geomechanics > 37 > 11 > 1614 - 1627

In this first part of the work, we develop macroscopic models for migration and diffusion–migration of ionic species in saturated porous media, based on periodic homogenization. The prior application is chloride transport in cementitious materials. The dimensional analysis of Nernst–Planck equation lets appear to dimensionless numbers characterizing the ionic transfer in the porous medium. Using experimental...

article

Redox switching of Prussian blue thin films investigated by ac-electrogravimetry

L. To Thi Kim, C. Gabrielli, H. Perrot, J. Garcia-Jareno, more

Electrochimica Acta > 2012 > 84 > Complete > 35-48

In this paper, the redox switching behaviour of Prussian blue (PB) in KCl environment at pH 2.5 and 5.4 was investigated by using ac-electrogravimetry in a potential range around the conversion of PB to ES (Everitt Salt). This technique allows the electrochemical impedance and a mass–potential transfer function to be simultaneously measured. From the impedance the charge–potential transfer function...

article

Modeling the Chlorides Transport in Cementitious Materials By Periodic Homogenization

K. Bourbatache, O. Millet, A. Aït-Mokhtar, O. Amiri

Transport in Porous Media > 2012 > 94 > 1 > 437-459

In this work, we develop a macroscopic model for diffusion–migration of ionic species in saturated porous media, based on periodic homogenization. The prior application is chloride transport in cementitious materials. The dimensional analysis of Nernst–Planck equation lets appear dimensionless numbers characterizing the ionic transfer in porous media. Using experimental data, these dimensionless numbers...

article

High frequency mass transfer responses with polyaniline modified electrodes by using new ac-electrogravimetry device

R. Torres, Y. Jimenez, A. Arnau, C. Gabrielli, more

Electrochimica Acta > 2010 > 55 > 21 > 6308-6312

For many years, polyaniline films have appeared to be one of the most studied conducting polymers. At the same time, ac-electrogravimetry has been used as a powerful technique for different polymer films but in general for slow perturbation rates. Two reasons for that: on the one hand, high frequency mass transfer responses are not expected and on the other hand, the electronic interfaces dedicated...

article

Electrochemical and electrogravimetric behaviors of conducting polymer. Theoretical aspects and application to co-polymer films based on juglone

A. Rubin, H. Perrot, C. Gabrielli, M.C. Pham, more

Electrochimica Acta > 2010 > 55 > 21 > 6136-6146

Redox mechanisms of conducting polymers are not yet fully understood. Attractive analytical tools and pertinent models are necessary to achieve this goal. In this paper, numerical simulations based on a theory dealing with ions transfer through electroactive film/electrolyte interface was developed to predict the behavior of a conducting polymer called poly(JUG-co-JUGA). The main advantage of this...

article

Definition of ionic transfer mechanisms based on positron annihilation studies in lithium batteries

Fu-Ming Wang, Chien-Chieh Hu, Shen-Chuan Lo, Yung-Yun Wang, more

Journal of Electroanalytical Chemistry > 2010 > 644 > 1 > 25-29

An interface ionic transfer detection method called the Doppler broadening S parameter of positron annihilation spectroscopy (PAS) is used to study polysiloxane solid electrolytes with ethylene oxide (EO) side chains and carbonate liquid electrolytes. First, the solid polymer electrolytes are modified to enhance contact with an acrylate, and an increase in the lengths of the EO chains is shown to...

article

Ac-electrogravimetry study of ionic exchanges on a polypyrrole modified electrode in various electrolytes

C. Gabrielli, H. Perrot, A. Rubin, M.C. Pham, more

Electrochemistry Communications > 2007 > 9 > 9 > 2196-2201

For many years, polypyrrole films have appeared to be the most studied conducting polymer. Unfortunately, shadows still remain concerning the electrochemical mechanisms of these films and in particular, the aspect which concerns the limiting step which governs the electrochemical response. Different possibilities are available such as the transport of ionic species in the film, the electron transfer...

article

Determination of Mass Coefficients of Ions in a Quantitative Analysis of the Effect of Natural Convection on Electrochemical Processes

D. A. Bograchev, V. M. Volgin, A. D. Davydov

Russian Journal of Electrochemistry > 2005 > 41 > 11 > 1197-1204

Methods for calculating buoyancy forces in multicomponent electrochemical systems using relative ion mass coefficients are analyzed. An approximate method for determining ion mass coefficients using the available reference data on the concentration dependences of densities of individual substance solutions is developed. Ionic mass coefficients, found using this method, are tabulated. These can be...

article

SELCO-Ecopurin ⁽ R) pig slurry treatment system

Jesus Martinez-Almela, Jorge Manuel Barrera

Bioresource Technology > 2005 > 96 > 2 > 223-228

As the practice of intensive animal production increases, there is a need for affordable treatment technologies that can help manage the large amounts of manure generated. Our approach has been to develop an efficient liquid-solid separation module using polymer technology and integrate this separation module into systems of treatment technologies for both the separated liquid and solids. We describe...

article

Potentiometric investigation of the effect of the pH on the ionic transfer of some amino acids at the interface between two immiscible electrolyte solutions

Tan;ƫa Spătaru, Nicolae Spătaru, Nicolae Bonciocat, Constantin Luca

Bioelectrochemistry > 2004 > 62 > 1 > 67-71

The effect of the pH on the ionic transfer of glycine and β-alanine at the interface between two immiscible electrolyte solutions (ITIES) was investigated by a simple potentiometric method. Upon addition of small amounts of solution containing the investigated amino acids, a variation of the potential drop across the interface was recorded, which was found to be pH-dependent. This behavior was explained...

article

Distribution of three ions in the thin film experiment

Milivoj Lovrić, Šebojka Komorsky-Lovrić

Electrochemistry Communications > 2003 > 5 > 8 > 637-643

In the theoretical model it is assumed that a graphite disk electrode is covered by a thin film of the solution of decamethylferrocene and some supporting electrolyte in nitrobenzene and immersed in an aqueous solution of the same electrolyte. Oxidation of decamethylferrocene is accompanied by the transfer of anions of the electrolyte from water into nitrobenzene. The flux of decamethylferrocenium...

article

Ionic conductivity threshold in sulfonated poly (phenylene oxide) matrices: a combination of three-phase model and percolation theory

Xu Tongwen, Yang Weihua, He Binglin

Chemical Engineering Science > 2001 > 56 > 18 > 5343-5350

In this paper, both the percolation theory and the three-phase model (TPM) are employed to study the ionic transport behavior in sulfonated poly(phenylene oxide) (SPPO) series membranes. The conductive fraction was obtained from TPM, which had considered contributions of both the functional group and the neutral electrolytes impregnated in the polymer gel. The critical threshold at which the ions...

article

An investigation by EIS of gramicidin channels in bilayer lipid membranes

S. Alonso-Romanowski, L. M. Gassa, J. R. Vilche

Electrochimica Acta > 1995 > 40 > 10 > 1561-1567

The influence of Li ⁺ , Na ⁺ , K ⁺ , and Cs ⁺ ions on the characteristics and properties of Black Lipid Membranes (BLM) made of diphytanoylphosphatydilcholine (DPhPC), with thickness thinner than 10 nm, were investigated using electrochemical impedance spectroscopy (EIS). The impedance spectra of the base system including the film and its adjacent chloride ion containing...

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Search results

Multi-scale Periodic Homogenization of Ionic Transfer in Cementitious Materials

Influence of annealing on ionic transfer and storage stability of Li2S–P2S5 solid electrolyte

Homogenization Methods for Ionic Transfers in Saturated Heterogeneous Materials

Impact of surface properties of hydrated compounds based on ZrO ₂ on the value of ionic conduction

Development of Monopole Interaction Models for Ionic Compounds. Part I: Estimation of Aqueous Henry’s Law Constants for Ions and Gas Phase pK_a Values for Acidic Compounds

Chloride transfer in cement‐based materials. Part 2. Experimental study and numerical simulations

Chloride transfer in cement‐based materials. Part 1. Theoretical basis and modelling

Redox switching of Prussian blue thin films investigated by ac-electrogravimetry

Modeling the Chlorides Transport in Cementitious Materials By Periodic Homogenization

High frequency mass transfer responses with polyaniline modified electrodes by using new ac-electrogravimetry device

Electrochemical and electrogravimetric behaviors of conducting polymer. Theoretical aspects and application to co-polymer films based on juglone

Definition of ionic transfer mechanisms based on positron annihilation studies in lithium batteries

Ac-electrogravimetry study of ionic exchanges on a polypyrrole modified electrode in various electrolytes

Determination of Mass Coefficients of Ions in a Quantitative Analysis of the Effect of Natural Convection on Electrochemical Processes

SELCO-Ecopurin ⁽ R) pig slurry treatment system

Potentiometric investigation of the effect of the pH on the ionic transfer of some amino acids at the interface between two immiscible electrolyte solutions

Distribution of three ions in the thin film experiment

Ionic conductivity threshold in sulfonated poly (phenylene oxide) matrices: a combination of three-phase model and percolation theory

An investigation by EIS of gramicidin channels in bilayer lipid membranes

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