Electrochemical permeability measurements of hydrophilic and hydrophobized montmorillonite films: Part I. Characteristics of diffusional transport: Kinetics of break-in/leach-out processes

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Abstract

In the first part of our electrochemical (cyclic voltammetric) study of montmorillonite-modified electrodes, results about film permeability have been presented. The structure of the porous aerogel-hydrogel and the effect of layer-thickness have been discussed. The more compact structure and less permeable Na- and H-montmorillonite result in smaller peak currents characteristic of the permeability of the clay film, than with more permeable Ca-montmorillonite. The thicker the film the less organized the structure and the value of the peak current decreases at increasing thickness.The kinetics of the hydration-dehydration, swelling-shrinking ("break-in/leach-out") processes and the effect of hydrophobization were demonstrated, too. Kinetical measurement data provide information about diffusional transport via macro, meso-, and micropores, and thus characterize pore structure. Permeability decreases with increasing extents of hydrophobization. The rate constants of structure-dependent macro- and microdiffusion have been calculated.

Original languageEnglish
Pages (from-to)107-119
Number of pages13
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume229
Issue number1-3
DOIs
Publication statusPublished - Nov 24 2003

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Bentonite
montmorillonite
Clay minerals
permeability
Kinetics
Macros
kinetics
Aerogels
Hydrogel
aerogels
Pore structure
Dehydration
Hydrogels
dehydration
swelling
Hydration
clays
Swelling
hydration
Rate constants

Keywords

  • Break-in
  • Clay-modified electrodes
  • Diffusion
  • Kinetics
  • Leach-out
  • Permeability
  • Porosity

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

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title = "Electrochemical permeability measurements of hydrophilic and hydrophobized montmorillonite films: Part I. Characteristics of diffusional transport: Kinetics of break-in/leach-out processes",
abstract = "In the first part of our electrochemical (cyclic voltammetric) study of montmorillonite-modified electrodes, results about film permeability have been presented. The structure of the porous aerogel-hydrogel and the effect of layer-thickness have been discussed. The more compact structure and less permeable Na- and H-montmorillonite result in smaller peak currents characteristic of the permeability of the clay film, than with more permeable Ca-montmorillonite. The thicker the film the less organized the structure and the value of the peak current decreases at increasing thickness.The kinetics of the hydration-dehydration, swelling-shrinking ({"}break-in/leach-out{"}) processes and the effect of hydrophobization were demonstrated, too. Kinetical measurement data provide information about diffusional transport via macro, meso-, and micropores, and thus characterize pore structure. Permeability decreases with increasing extents of hydrophobization. The rate constants of structure-dependent macro- and microdiffusion have been calculated.",
keywords = "Break-in, Clay-modified electrodes, Diffusion, Kinetics, Leach-out, Permeability, Porosity",
author = "P. Jo{\'o}",
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AU - Joó, P.

PY - 2003/11/24

Y1 - 2003/11/24

N2 - In the first part of our electrochemical (cyclic voltammetric) study of montmorillonite-modified electrodes, results about film permeability have been presented. The structure of the porous aerogel-hydrogel and the effect of layer-thickness have been discussed. The more compact structure and less permeable Na- and H-montmorillonite result in smaller peak currents characteristic of the permeability of the clay film, than with more permeable Ca-montmorillonite. The thicker the film the less organized the structure and the value of the peak current decreases at increasing thickness.The kinetics of the hydration-dehydration, swelling-shrinking ("break-in/leach-out") processes and the effect of hydrophobization were demonstrated, too. Kinetical measurement data provide information about diffusional transport via macro, meso-, and micropores, and thus characterize pore structure. Permeability decreases with increasing extents of hydrophobization. The rate constants of structure-dependent macro- and microdiffusion have been calculated.

AB - In the first part of our electrochemical (cyclic voltammetric) study of montmorillonite-modified electrodes, results about film permeability have been presented. The structure of the porous aerogel-hydrogel and the effect of layer-thickness have been discussed. The more compact structure and less permeable Na- and H-montmorillonite result in smaller peak currents characteristic of the permeability of the clay film, than with more permeable Ca-montmorillonite. The thicker the film the less organized the structure and the value of the peak current decreases at increasing thickness.The kinetics of the hydration-dehydration, swelling-shrinking ("break-in/leach-out") processes and the effect of hydrophobization were demonstrated, too. Kinetical measurement data provide information about diffusional transport via macro, meso-, and micropores, and thus characterize pore structure. Permeability decreases with increasing extents of hydrophobization. The rate constants of structure-dependent macro- and microdiffusion have been calculated.

KW - Break-in

KW - Clay-modified electrodes

KW - Diffusion

KW - Kinetics

KW - Leach-out

KW - Permeability

KW - Porosity

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