Cation mobility in systems based on high-molecular-weight sulfonic acids and polyaniline

Стенина, И. А.; Ильина, А. А.; Pinus, I. Yu.; Sergeev, V. G.; Yaroslavtsev, A. B.

doi:10.1007/s11172-008-0317-z

Cited by 14 publications

(16 citation statements)

References 6 publications

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“…7. 17 When these results are compared with the data obtained for the membranes containing PAni and acid, 8 a low electron component of conductivity can be noted as a characteristic feature of the composite membranes pre pared in our group. It is most probable that this is due to the fact that the polyaniline fragments are isolated from each other by the matrix of the membrane.…”

Section: Resultsmentioning

confidence: 54%

“…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. According to the thermo gravimetry data, this noticeably decreases the humidity of the membranes if PAni is incorporated in them.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, in the case of the mem branes casted with preliminarily produced particles of a dopant or precursor, the samples containing more than 13 vol.% silica, 26 vol.% PAni, or 25 vol.% Ag undergo fracturing during formation. 14, 16,17 Conductivity of the modified membranes at low humi dity. One of the main advantages of a series of hybrid membranes is a substantial increase in the conductivity at low values of humidity of the environment.…”

Section: Resultsmentioning

confidence: 99%

“…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 to 13.5 vol.% (15 wt.%) silica and 26 vol.% (14 wt.%) polyaniline (PAni) into the membrane matrix. Tetraethoxysilane (TEOS, ≥98%, Fluka) and a solution of zirconium tetrachloride (Merck) or zirconium propoxide (Aldrich, 70% solution in propan 1 ol) were used to prepare the precursor.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

On the mechanism of increasing ion conductivity in hybrid membranes

et al. 2011

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“…Second method consisted in casting of composite membranes from solution of polymer and precursor for further particle synthesis. 10,11 This method provided incorporation of SiO 2 up to 13.5 vol% (15 wt%) and PAni up to 26 vol% (14 wt%). The transmission electron microscopy showed that in all cases isolated nanoparticles (2-6 nm) were formed in membrane matrix.…”

mentioning

confidence: 99%