Ion transfer in composite membranes based on MF‐4SC incorporating nanoparticles of silica, zirconia, and polyaniline

Yaroslavtsev, A. B.; Стенина, И. А.; Voropaeva, E. Yu.; Ilyina, A. A.

doi:10.1002/pat.1384

Cited by 39 publications

(13 citation statements)

References 14 publications

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“…The most perspective direction of improving membrane functioning performance is their modification by addition of nano-sized particles of organic and inorganic compounds resulting in enhancement of proton conductivity and membrane hydrophilic nature at low relative humidity that takes place during stationary work of fuel cells [108][109][110][111][112]. Polymeric hydrogels, hydrocarbonic ion exchangers with a high exchange capacity and also mineral substances like silicon oxides, aluminum oxides and zirconium phosphates [99,[113][114][115][116][117][118][119][120] can be used as such additives. Perspective method of perfluorinated membrane modifying is the polymer (polyaniline, polypyrrol, polythiophene) synthesis in the membrane matrix [120][121][122][123][124][125].…”

Section: Structural Characteristics Of Modified Perfluorinated Membranesmentioning

confidence: 99%

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Kononenko

Fomenko

Volfkovich

2015

Advances in Colloid and Interface Science

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Section: Structural Characteristics Of Modified Perfluorinated Membranesmentioning

confidence: 99%

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Kononenko

Fomenko

Volfkovich

2015

Advances in Colloid and Interface Science

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“…Analogous effect can be achieved by the introduction of PAni. 17, 26 The surface of the latter is not hydrophobic because of the presence of nitrogen atoms, but these are the nitrogen atoms that form strong hydro gen bonds with the sulfo groups upon incorporation into MF 4SC. 17 Thus, the hydrophilic sites block each other in the system considered.…”

Section: Resultsmentioning

confidence: 99%

On the mechanism of increasing ion conductivity in hybrid membranes

et al. 2011

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Ion conductivity of hybrid membrane materials with incorporated nanoparticles of inor ganic compounds and polyaniline was considered. A new theory of semielasticity of membrane pore walls was suggested in order to explain the phenomenon of increasing ion conductivity in such systems. It was assumed that in the low humidity region an additional contribution to the conductivity increase is made by the transfer over the incorporated nanoparticles surface.Purity control in industry, waste decontamination, first of all, treatment of waste waters, and search for new eco logically safe energy sources became especially important in recent decades. 1-3 . These problems can be solved main ly by using diverse membrane materials, 4 which yet do not always meet growing demands of science and industry. Therefore, works in the area of modification of membrane materials, especially, production of hybrid membranes containing inorganic and high molecular weight compo nents are now being persued intensively. 5, 6 Various approaches including either chemical or me chanical treatment of the surface or modification of the volume are applied for the synthesis of materials with di verse properties using comparatively few number of pro duction run membranes. 4,6,7 The methods of preparation of volume modified hybrid materials of the organic/inor ganic type are most promising and they are widely used in alternative power engineering. 5,6,8,9Most frequently, inorganic nanodispersed particles or a precursor for their further preparation are incorporated into a solution from which the membrane is casted. The efficiency of this modification decreases because of aggregate formation. However, the walls of nanopores, which are present in the matrix of the prepared membrane, can effi ciently isolate formed particles and decrease surface tension, thus providing the thermodynamic stability of the nanopart icles. That is why, the most promising method for the preparation of hybrid materials is the synthesis of nano particles directly in the membrane pores, which act as unique nanoreactors. 10 Among the advantages of hybrid membranes is higher ion conductivity, which is substantially manifested at low humidity. 5,10,11 At the same time, we found no single explanation of this phenomenon in the literature.An attempt is made to summarize our recent results to explain an increase in the ion conductivity in the hybrid membranes. ExperimentalComposite membranes were prepared by two different meth ods. According to the first method, 12-15 additives were synthe sized in pores of the prepared perfluorinated sulfocationite mem brane MF 4SC (in situ). The composite membranes with the dopant content up to 4.4 vol.% (5 wt.%) and 1.9 vol.% (5 wt.%) for silica and zirconia nanoparticles, respectively, and 2.8 vol.% (12 wt.%) for silver nanoparticles were thus synthesized. The second method involves casting of composite membranes from a solution of polymer with a precursor for the further synthesis of particles. 16,17 This method made it possible to incorporate up t...

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“…The conductivity of the membranes in distilled water is 15-20 % greater after polyaniline intercalation in comparison with the initial membrane conductivity, as mentioned in [30,31]. But it is very important to get the information about conducting properties of the composites in electrolyte solution to apply them in electromembrane separation processes.…”

Section: Conductivitymentioning

confidence: 95%

Influence of conditions of polyaniline synthesis in perfluorinated membrane on electrotransport properties and surface morphology of composites

Kononenko

Loza

Shkirskaya

et al. 2015

J Solid State Electrochem

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The conductivity, diffusion, and electroosmotic permeability of composites, obtained in different conditions of polyaniline synthesis on the surface or in volume of perfluorinated MF-4SK membrane, were studied. The oxidative polymerization of aniline was carried out in static conditions in mixture of monomer and oxidant solutions, in concentration field by method of successive diffusion of polymerization solutions through the membrane in water, and in an external electrical field. The concentration of polymerization solutions, the type of electron acceptors, duration of synthesis, and current density were varied to obtain a set of composites. The certain advantages of every method of polyaniline chemical template synthesis were revealed to prepare the materials with required set of the electrotransport characteristics.

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Ion transfer in composite membranes based on MF‐4SC incorporating nanoparticles of silica, zirconia, and polyaniline

Cited by 39 publications

References 14 publications

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

On the mechanism of increasing ion conductivity in hybrid membranes

Influence of conditions of polyaniline synthesis in perfluorinated membrane on electrotransport properties and surface morphology of composites

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