New approach to characterization of hybrid nanocomposites

Филиппов, А. Н.; Афонин, Д. С.; Kononenko, N. A.; Lvov, Yuri; Винокуров, В. А.

doi:10.1016/j.colsurfa.2016.08.079

Cited by 26 publications

(18 citation statements)

References 9 publications

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“…Similar assumptions are accepted in some recent models of ion sorption and transfer in charged membranes regarded as homogeneous medium [114][115][116][117][118][119]. Filippov et al [114][115][116][117] use the so-called fine-pore model, which allows description of some special cases, for example, when an organic IEM contains inorganic nanoparticles. Fila and Bouzek [118,119] use the same assumption as the TMS model but apply the extended Nernst-Planck equation, which contains the convective term.…”

Section: Teorell-meyer-sievers (Tms) Modelmentioning

confidence: 78%

“…Quantitative description of the effect of nanoparticles on the transport properties of IEMs is a rather complicated problem. Filippov et al [115][116][117] developed a fine-pore model of ion transfer in an IEM with immobilized nanoparticles. The membrane is considered as quasi-homogeneous medium as in the TMS theory and applies the approach known as the "fine porous membrane" model suggested by Starov, Churaev and Martynov [173].…”

Section: Modelling Of Properties Of Ion-exchange (Iems) Containing Namentioning

confidence: 99%

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Modelling of Ion Transport in Electromembrane Systems: Impacts of Membrane Bulk and Surface Heterogeneity

et al. 2018

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Artificial charged membranes, similar to the biological membranes, are self-assembled nanostructured materials constructed from macromolecules. The mutual interactions of parts of macromolecules leads to phase separation and appearance of microheterogeneities within the membrane bulk. On the other hand, these interactions also cause spontaneous microheterogeneity on the membrane surface, to which macroheterogeneous structures can be added at the stage of membrane fabrication. Membrane bulk and surface heterogeneity affect essentially the properties and membrane performance in the applications in the field of separation (water desalination, salt concentration, food processing and other), energy production (fuel cells, reverse electrodialysis), chlorine-alkaline electrolysis, medicine and other. We review the models describing ion transport in ion-exchange membranes and electromembrane systems with an emphasis on the role of micro-and macroheterogeneities in and on the membranes. Irreversible thermodynamics approach, "solution-diffusion" and "pore-flow" models, the multiphase models built within the effective-medium approach are examined as the tools for describing ion transport in the membranes. 2D and 3D models involving or not convective transport in electrodialysis cells are presented and analysed. Some examples are given when specially designed surface heterogeneity on the membrane surface results in enhancement of ion transport in intensive current electrodialysis.Recently, Svoboda et al. [13] developed a specific scanning cell for the analysis of heterogeneous IEM structure by micro-computed tomography, which provides volume reconstruction of the studied material. The unique working principle of the cell allows one to scan membranes not only in their dry state but also in fully swollen state. The micro-computed tomography showed that there are profound changes in the structure of the IEM associated with their transition from the dry state into the swollen one. This study applied to the heterogeneous cation-exchange membrane (CEM) coming from Mega a.s., Czech Republic showed that swelling of the membrane is caused by the swelling of the ion-exchange resin. Its volume increased nearly three times after exposure to deionized water, while the overall membrane volume increased by 50%. If the membrane contained approximately 28%vol. of the resin in the dry state, this content increased to 52%vol. after swelling.Micro-computed tomography not only allows one to analyse volumetric composition of the membrane bulk but also to quantify the composition of the surface. By using two different methods, Vobecka et al. [14] evaluated the fraction of the conductive area (e.g., the ion-exchange resin) on the surface of an AEM and CEM in the swollen state. The obtained results showed that the volume fraction of the conductive domains does not correspond to the surface fraction of these domains and thus the volume composition is not reflected on their surface. For example, the volume fraction of the conductive domains for the st...

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Section: Teorell-meyer-sievers (Tms) Modelmentioning

confidence: 78%

Section: Modelling Of Properties Of Ion-exchange (Iems) Containing Namentioning

confidence: 99%

Modelling of Ion Transport in Electromembrane Systems: Impacts of Membrane Bulk and Surface Heterogeneity

et al. 2018

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“…Let us also note other theoretical approaches to the description of hybrid membranes. Filippov et al [162,163] have developed the so-called fine-pore model, suggesting a membrane to be a quasi-homogeneous medium, the thermodynamic and kinetic parameters of which depend on the presence of nanoparticles in the pores.…”

Section: Modern Aspects Of the Theory And Simulation Of Ion And Watermentioning

confidence: 99%

Prospects of Membrane Science Development

Apel

Бобрешова

Волков

et al. 2019

Membr. Membr. Technol.

123

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Membranes are widely used in modern technology. The demand for different types of membranes and membrane processes is increasing every year. This review summarizes the current state of the art and prospects of membrane science developments including membrane materials for gas separation, pervaporation, and pressure-driven membrane processes; ion-exchange, hybrid, and track-etched membranes; membranes for electrochemical sensors; and mathematical modeling of membrane separation processes and ion and water transport in membrane systems. Studies aimed at improving the selectivity and performance of membranes and their stability are surveyed. New approaches to the synthesis and modification of membranes as well as their advanced applications are discussed.

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“…For instance, the diffusion permeability of the platinum nanoparticles modified membrane is two times lower than that of the original membrane, MF‐4SC. This suggests that in fuel cell conditions, the crossover (gas transfer) through the modified membranes would be lowered as well …”

Section: Halloysite – Metal Nanoparticles Architecturesmentioning

confidence: 99%

“…It was found that when cyclohexene was used as a substrate (80 °C, 12 h., 4 atm. of O 2 ), the reaction involved a radical‐chain mechanism; its rate and product distribution were significantly dependent on gold loading . Maximum conversion was 29 % after 12 hours, with 2‐cyclohexen‐1‐ol and 2‐cyclohexen‐1‐one being formed as the main reaction products (maximum selectivity was 35 and 49 %).…”

Section: Halloysite – Metal Nanoparticles Architecturesmentioning

confidence: 99%

Nanoparticles Formed onto/into Halloysite Clay Tubules: Architectural Synthesis and Applications

Винокуров

Stavitskaya

Glotov

et al. 2018

The Chemical Record

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Nanoparticles, being objects with high surface area are prone to agglomeration. Immobilization onto solid supports is a promising method to increase their stability and it allows for scalable industrial applications, such as metal nanoparticles adsorbed to mesoporous ceramic carriers. Tubular nanoclay - halloysite - can be an efficient solid support, enabling the fast and practical architectural (inside / outside) synthesis of stable metal nanoparticles. The obtained halloysite-nanoparticle composites can be employed as advanced catalysts, ion-conducting membrane modifiers, inorganic pigments, and optical markers for biomedical studies. Here, we discuss the possibilities to synthesize halloysite decorated with metal, metal chalcogenide, and carbon nanoparticles, and to use these materials in various fields, especially in catalysis and petroleum refinery.

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New approach to characterization of hybrid nanocomposites

Cited by 26 publications

References 9 publications

Modelling of Ion Transport in Electromembrane Systems: Impacts of Membrane Bulk and Surface Heterogeneity

Modelling of Ion Transport in Electromembrane Systems: Impacts of Membrane Bulk and Surface Heterogeneity

Prospects of Membrane Science Development

Nanoparticles Formed onto/into Halloysite Clay Tubules: Architectural Synthesis and Applications

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