Transport structural parameters to characterize ion exchange membranes

Gnusin, N. P.; Березина, Н. П.; Kononenko, N. A.; Dyomina, O.A.

doi:10.1016/j.memsci.2004.06.033

Cited by 114 publications

(56 citation statements)

References 15 publications

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“…[15][16][17] However, in spite of such significant amount of work, nanoscale details about the molecular structure of ion-exchange membranes and the proton transport mechanism remain essentially unknown. Although theoretical studies based on molecular dynamics (MD) simulations are expected to be important not only for the elucidation of details about the protons transport across membranes but also for the design of good performance conducting membranes, the number of reported investigations is relatively scarce.…”

Section: Introductionmentioning

confidence: 99%

Field-Induced Transport in Sulfonated Poly(styrene-co-divinylbenzene) Membranes

et al. 2010

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Atomistic simulations have been carried to investigate electric field induced transport of hydronium ions in a sulfonated poly(styrene-co-divinylbenzene) membrane. In order to provide a good description of this cross-linked material, a methodology has been explicitly designed to construct a reliable model of the hydrated membrane. This model has been used to carry out molecular dynamics simulations in presence of electric fields, which varied from 0.001 to 3.0 V 3 nm -1 . Results show that the electric field affects the structure of the membrane producing both a redistribution of the unoccupied volume, which modifies the heterogeneity of the resin, and a rearrangement of the negatively charged sulfonate groups, which undergo a systematic alignment along the electric field direction. As was expected, the mobility of hydronium ions is enhanced with the strength of the electric field. Moreover, the electric field induces a significant rearrangement of the sulfonate groups, which is evidenced by the alignment of the C-S bonds along the direction of the field. The membrane has been found to behave as a spring, in which the force exerted by the electric field acts in opposite sense to the force exerted by the internal structure of the cross-linked material.

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Section: Introductionmentioning

confidence: 99%

Field-Induced Transport in Sulfonated Poly(styrene-co-divinylbenzene) Membranes

et al. 2010

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“…The flux across the supported paint film (N) can be obtained from a mass balance to both chambers: (2) By simplifying this equation one obtains: (3) where V L is the volume of the lower chamber, V U is the volume of the upper chamber, A is the effective permeation area, C L and C U are the concentrations at the lower and upper chambers, respectively, and t is time. Introducing this equation into equation (1), it becomes: (4) where L C is the permeability of the supported paint film, δ C is the thickness of the supported paint film, C L 0 is the initial concentration at the lower chamber, which should be C L 0 = 0, and C U 0 is the initial concentration at the upper chamber (this concentration is constant and equal to 2.5 M).…”

Section: Methodsmentioning

confidence: 99%

“…3,4 This means that it is not possible to regulate the chloride ion transport by simply regulating the liquid water permeability, as stated in prEN 1504-2; 1 direct determinations must be performed. In Portugal, the National Laboratory of Civil Engineering (LNEC) has proposed a threshold permeability value of 10 -14 m 2 /sec towards the chloride ion for coatings claiming to be corrosion protective.…”

mentioning

confidence: 99%

Permeability of paint films towards chloride ion

Carneiro¹,

Oliveira²,

Nogueira³

et al. 2006

J Coat. Technol. Res.

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“…Both types are often reinforced with fitting fabrics (PES, PP, PA). The concentration of ion-exchange particles in the matrix varies between 50 and 70 wt% [16,17].…”

Section: Introductionmentioning

confidence: 99%