A comparative study of the electro-osmotic behavior of cation and anion exchange membranes in alcohol-water media

García-Nieto, David; Barragán, V.M.

doi:10.1016/j.electacta.2014.12.070

Cited by 20 publications

(22 citation statements)

References 57 publications

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“…It is well known that with increasing electrolyte concentration, the membrane liquid content decreases [15]. The reason is that with increasing concentration of external solution the osmotic pressure increases, while that in the internal solution of the membrane grows only to a small extent, since the ionic force changes a little.…”

Section: Liquid Uptakementioning

confidence: 99%

“…A more appropriate measure of the true concentration of fixed charge groups is the concentration of the fixed ions groups of the membrane per volume of swollen membrane, X [16]. The value of this variable can be determined from the ion-exchange capacity given by the manufacturer, the density and the liquid uptake of the membrane [15] as follows:…”

Section: Liquid Uptakementioning

confidence: 99%

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Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Somovilla

Villaluenga

Barragán

et al. 2016

Journal of Membrane Science

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a b s t r a c tLiquid uptake and streaming potential have been determined in aqueous sodium chloride solutions for five different commercial sulfonated polymer cation-exchange membranes. The selected membranes have distinct morphologies and electrochemical properties. Differences in the liquid uptake properties of the membranes have been found, which have been analysed on the basis of the structure and the chemical properties of the membranes. In most of the membranes analyzed, the higher the liquid content of the membranes, the lower the effective concentration of fixed charges in the membranes. The streaming potential across the membranes increases linearly with the established pressure difference, and it is larger in heterogeneous membranes than in homogeneous ones. In general, the higher the membrane liquid content, the higher the streaming potential across the membranes.

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Section: Liquid Uptakementioning

confidence: 99%

Section: Liquid Uptakementioning

confidence: 99%

Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Somovilla

Villaluenga

Barragán

et al. 2016

Journal of Membrane Science

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show abstract

“…The static and dynamic properties of charged surface systems can be related to the structure of the EDL and the interactions between molecules in the EDL and the substrate [13][14][15]. Furthermore, understanding the electrohydrodynamics in the EDL is critical for numerous applications, such as separation [16,17], fuel cell performance [18], energy storage and conversion [19][20][21], contaminant removal [22], and manipulation of single molecules [23,24]. In addition to the surface properties, the EDL structure also depends on salt concentration and ion types.…”

Section: Introductionmentioning

confidence: 99%

Anomalous electrokinetics at hydrophobic surfaces: Effects of ion specificity and interfacial water structure

Cao

Netz

2018

Electrochimica Acta

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We study the electrokinetic transport behavior of water molecules and ions in hydrophobic graphene nanochannels with variable surface charge densities and the interfacial water structure based on detailed molecular dynamics simulations. The interfacial water structure, described by the water density, hydrogen bonding, diffusion, distribution of the OH bond and dipole orientations, are strikingly influenced by the surface charge.We find anomalous electrostatic effects which depend on the distribution of counterions close to the surface, ion-specific effects and interfacial water structure. On a negatively charged surface, the attraction of Na + ions towards the graphene layer enhances the interfacial friction. In contrast, if the surface is positively charged, high surface charge density triggers an anomalous enhancement of electroosmotic flow, accompanied by an abrupt change of the interfacial water structure. At high surface charge densities, the mobility of the interfacial water at the positively charged surfaces is suppressed more strongly compared to the negatively charged surface. Our results imply new physics in electrokinetic transport when both negatively and positively charged surfaces are considered.

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“…The use of anion-exchange membranes as solid polymer in AFCs avoids the problems of the liquid electrolyte. In addition, the water management is improved due to the electro-osmotic drag transporting water way from the cathode to the anode reducing the alcohol crossover problem [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

Lain

Barragán

2016

International Journal of Hydrogen Energy

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A comparative study of the electro-osmotic behavior of cation and anion exchange membranes in alcohol-water media

Cited by 20 publications

References 57 publications

Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Anomalous electrokinetics at hydrophobic surfaces: Effects of ion specificity and interfacial water structure

Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

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