Electrical conductivity of KCl solutions in pores of track-etched polymer membranes

Березкин, В. В.; Киселева, О. А.; Mchedlishvili, B. V.; Соболев, В. Д.

doi:10.1134/s0965544112080038

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…To study the impedance characteristics of the membrane, it was placed in a cell (Figure 1), having a Teflon body (1), between two platinum electrodes (2,4). The cell was previously described in detail by Berezkin et al, 2012. The volume on both sides of the membrane (3) was filled with the studied fluid.…”

Section: A Glassy Polymer Of Internal Microporosity Poly[1-(trimethylsilyl)-1-propyne]mentioning

confidence: 99%

Transport Properties of Liquid Phase Percolation Cluster in Highly Permeable Glassy Polymers

Соболев¹,

Yushkin²,

Sabbatovskiy³

et al. 2020

PTQ

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Porosity, permeability, and conductivity of PTMSP membranes in ethanol-water mixtures were determined by analyzing the impedance characteristics. The critical volume fraction of porosity at which through conductivity channels are formed was calculated. When the alcohol content in the solution increases, it was 0.29; when it decreases, it was 0.17. The obtained dependencies indicate that the transfer of matter in the membrane occurs the liquid phase elements, forming a percolation cluster as the amount of sorbed liquid increases. The hysteresis effect was observed in the measured values of porosity, permeability, conductivity, and capacity. The porous structure of a dry PTMSP membrane consists of free volume elements that are unconnected to each other. At ⁓30% alcohol concentration, through channels, begin to form, connecting both sides of the membrane. In this case, both permeability and electrical conductivity increase as a power function, in contrast to the porosity that increases linearly. Lichtenecker and Rother’s formula helped to calculate the volume fractions of the conducting and non-conducting phases in the system. The obtained values of the amount of liquid in the membrane at various spatial arrangements of the channels made it possible to establish the structure of the liquid-filled channels. The best agreement with the experimental values was obtained for the chaotic structure. This is consistent with the existing ideas about the structure of the studied membranes and confirms the assumption that the percolation cluster is formed from free volume elements filled with the liquid phase. The observed low values of the zeta potential and, consequently, the low values of the electrostatic component of the wedging pressure indicate that the increase in the size or the number of transport channels is associated with non-electrostatic forces.

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Section: A Glassy Polymer Of Internal Microporosity Poly[1-(trimethylsilyl)-1-propyne]mentioning

confidence: 99%

Transport Properties of Liquid Phase Percolation Cluster in Highly Permeable Glassy Polymers

Соболев¹,

Yushkin²,

Sabbatovskiy³

et al. 2020

PTQ

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An electrochemical study of microporous track-etched membrane permeability and the effect of surface protein layers

Adatia

Raja

Vadgama

2017

Colloids and Surfaces B: Biointerfaces

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Microporous track-etched membranes serve as important permeable growth surfaces for cell culture where diffusive solute transport is needed across two growth compartments. This study has established effective solute diffusion coefficients for four probe micro-solutes: hydrogen peroxide, pyrocatechol, acetaminophen and ascorbic acid across three track-etched membranes formulated, respectively, from polycarbonate and polyethylene terephthalate. Chronoamperometry and cyclic voltammetry were used for the diffusion measurements. These showed substantially reduced intra-pore diffusion in relation to available pore area. Diffusion coefficients ranging from 1.43×10 to 3.17×10cms were demonstrated. This strongly suggests that water organisation in micro-pores is not equivalent to that of bulk water. Superimposed protein layers of Type I and IV collagen, Type I collagen-fibronectin, Type I collagen-heparin, and Type I collagen-chondroitin sulphate increased diffusional resistance, but with disproportional retardation of ascorbate diffusion due to charge repulsion at collagen-heparin and collagen-chondroitin sulphate combinations. Diffusive resistance at natural tendon and cartilage was considerably smaller; diffusion coefficients ranged from 8.33×10 to 1.09×10cms.

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Influence of flow and charge transfer inside membranes on measurements of membrane zeta potential

Соболев

Филиппов

Starov

2021

Journal of Molecular Liquids

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Electrical conductivity of KCl solutions in pores of track-etched polymer membranes

Cited by 4 publications

References 6 publications

Transport Properties of Liquid Phase Percolation Cluster in Highly Permeable Glassy Polymers

Transport Properties of Liquid Phase Percolation Cluster in Highly Permeable Glassy Polymers

An electrochemical study of microporous track-etched membrane permeability and the effect of surface protein layers

Influence of flow and charge transfer inside membranes on measurements of membrane zeta potential

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