Mass transfer in Nation membrane systems: Effects of ionic size and charge on selectivity

Xue, Tingting; Longwell, R.B.; Osseo‐Asare, K.

doi:10.1016/s0376-7388(00)82454-0

Cited by 51 publications

(35 citation statements)

References 20 publications

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“…In this case, the ion-sulfonate group interactions would be relatively weak. Moreover, a decreased water content would be expected to cause stronger interaction between metal cations and the ionic groups in the membrane [24][25][26][27] Therefore, the higher membrane swelling works against the interaction between counterions and the sulfonated groups in the membrane polymer, and so, an increase of the effective fixed charge of the membranes is expected. Accordingly, the hydraulic permeability of the NF117 and ICR65 membranes decreases with the density of the ionic groups in the polymer, and thus the permeability of the Li + -form membranes is lower than that of acid form membranes as can be observed in Table 2.…”

Section: Determination Of the Electroosmotic And Hydraulic Permeabilimentioning

confidence: 99%

Experimental estimation of equilibrium and transport properties of sulfonated cation-exchange membranes with different morphologies

Barragán¹,

Villaluenga²,

Godino³

et al. 2009

Journal of Colloid and Interface Science

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Section: Determination Of the Electroosmotic And Hydraulic Permeabilimentioning

confidence: 99%

Experimental estimation of equilibrium and transport properties of sulfonated cation-exchange membranes with different morphologies

Barragán¹,

Villaluenga²,

Godino³

et al. 2009

Journal of Colloid and Interface Science

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“…In general it is believed that this material penetrates the catalyst layer and serves as an ionic bridge between the active sites of the electrocatalyst and the membrane surface thus facilitating proton removal. Ralph et al [25] presented a comprehensive study on the effect of dissolved Nafion ® loading in SPEMFC electrodes when at the same time significant research has focused on investigating the exact mechanism of performance improvement achieved through Nafion addition to the catalyst layer [26][27][28][29][30]. This major breakthrough probably poses the greatest limitation in trying alternative membranes.…”

Section: Direct Methanol Fuel Cell Performancementioning

confidence: 99%

Performance of the direct methanol fuel cell with radiation-grafted polymer membranes

Scott

Taama

Argyropoulos

2000

Journal of Membrane Science

155

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This paper reports performance data for the direct methanol fuel cell (DMFC) using membrane electrode assemblies using radiation-grafted proton exchange membranes based on polyethylene and ETFE. These membranes exhibited low methanol diffusion coefficients and were thus felt to be potentially useful in reducing possible methanol cross-over from anode to cathode. The membrane electrode assemblies were based on Nafion ® -bonded carbon-supported catalyst; platinum/ruthenium for the anode and platinum for the cathode. The cell voltage performance of the DMFC, for short duration (<100 h) testing, with these low cost membranes is as good as, or superior to, that of cells based on Nafion ® under identical operating conditions. However, the stability of contact between the membrane and the catalyst layer requires improvement before these membranes become real alternatives to materials such as Nafion ® , for the DMFC.

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“…There are several approaches in order to explain the actuation mechanism of IPMC membrane [9][10][11][12][13][14][15]. Both the structure of the material and the transport mechanism of ion exchange membranes enable the actuation of IPMCs.…”

Section: Introductionmentioning

confidence: 99%

“…(TEM analysis) [13,14] and James et al [15]. The microstructure of Nafion consists of the hydrophobic fluorocarbon backbone and hydrophilic anionic clusters of sulfonic acid groups, resulting in the formation of an interconnected cluster network in the hydrated membrane.…”

Section: Introductionmentioning

confidence: 99%

“Equivalent” Electromechanical Coefficient for IPMC Actuator Design Based on Equivalent Bimorph Beam Theory

Çilingir

Papila

2010

Exp Mech

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This paper addresses an "equivalent" electromechanical coupling coefficient that may be used in designing Ionic Polymer Metal Composite (IPMC) actuators. The coefficient is not a material constant and derived from equivalent bimorph beam model. The collective effect of the membrane thickness and operating voltage on the coefficient is demonstrated by using a design of experiment (DOE) of three and five levels of the two factors, respectively. Experiments and linear finite element analyses with MD.NASTRAN at DOE points are performed. The tip displacement and the coupling coefficient are reported and their response surface (RS) approximations as function of the thickness and voltage are constructed. Experiments and RS predictions indicate that actuator thickness and applied voltage are two interacting major factors for maximum tip displacement. The equivalent coupling coefficient is primarily driven by the thickness of actuator moreover voltage appears to contribute as the thickness increases. The initial curvature of the strips before electrical excitation is also shown to be a factor for "equivalent" coupling coefficient, it is not, however sufficient to explain the variation in the experimental data. A correction factor approach is proposed and applied to the straight beam tip displacement RS that filters out experimental variation. A corrected RS enables including the pre-imposed initial curvature as design parameter along with the actuator thickness and the operating peak voltage when predicting the tip displacement and the equivalent coupling coefficient.

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Mass transfer in Nation membrane systems: Effects of ionic size and charge on selectivity

Cited by 51 publications

References 20 publications

Experimental estimation of equilibrium and transport properties of sulfonated cation-exchange membranes with different morphologies

Experimental estimation of equilibrium and transport properties of sulfonated cation-exchange membranes with different morphologies

Performance of the direct methanol fuel cell with radiation-grafted polymer membranes

“Equivalent” Electromechanical Coefficient for IPMC Actuator Design Based on Equivalent Bimorph Beam Theory

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