Molecular Mobility in Microporous Architectures: Conductivity and Dielectric Relaxation Phenomena in Natural and Synthetic Zeolites

Kalogeras, Ioannis M.; Vassilikou‐Dova, Aglaia

doi:10.1002/crat.2170310602

Cited by 40 publications

(36 citation statements)

References 137 publications

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“…However, the presence of OH‐groups and protons owing to hydration increases the conductivity. At the same time, the activation energy decreases owing to the weakening of cation–lattice attraction caused by water–cation interaction …”

Section: Resultsmentioning

confidence: 99%

Electrical Properties of Microdischarge in Porous Zeolites

Koseoglu

Özer

Salamov

2014

Plasma Processes & Polymers

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The gas breakdown processes in dc microdischarges with a zeolite cathode (ZC) have been investigated. The electric field has a pronounce effect on the electrical characteristics of the ZC. The effects of electric field and secondary emission were discussed in atmospheric plasmas (AP). A nanoporous surface used as microreactor could enhance the electron emission from the cathode surface, thus reducing the breakdown voltage (UB). Results indicate that the UB decreases with increasing ZC diameter and decreasing with gap distance. Microdischarges in spatially confined geometries, such as the nanoporous structure of ZCs, present a promising method for the generation and maintenance of stable AP.

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Section: Resultsmentioning

confidence: 99%

Electrical Properties of Microdischarge in Porous Zeolites

Koseoglu

Özer

Salamov

2014

Plasma Processes & Polymers

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“…Способность катионов диффундировать сквозь большую открытую цеолитовую структуру дает возможность получения высокой ионной проводимости в цеолитах. За последние годы сделано немало попыток исследования факторов, которые управляют ионным транспортом во внешнем электрическом поле [24]. Эти исследования сфокусированы главным образом на влиянии температуры, степени гидратации, природы металлических катионов на проводимость, измеряемую на переменном напряжении.…”

Section: Introductionunclassified

Десорбция Положительных Ионов Металла С Поверхности Массивного Анода На Пластину Цеолита

Орбух¹,

Лебедев²,

Агамалиев³

et al. 2020

Журнал Технической Физики

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Рассмотрено явление переноса положительных ионов металла с поверхности массивного анода на поверхность цеолитовой пластины в аномально малом для этого явления внешнем электрическом поле. Объяснение наблюдаемого явления основано на том, что в электрическом поле на проводящих порах цеолита вблизи анода возникает отрицательный заряд, локализованный на стенках пор, создающий аномально большое локальное электрическое поле на поверхности анода. Это поле осуществляет перенос ионов с анода на поверхность цеолита. Приведены соображения, объясняющие пороговый (по величине внешнего поля) характер явления. Ключевые слова: цеолит, ионный обмен, ионы серебра, массоперенос.

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“…In these solids, the dielectric response arises from the dipolar reorientation associated with the thermally activated ionic hops occurring between neighboring ionic positions. In zeolites, it has thus been well established that dielectric relaxation is associated with the localized displacement of EFC located at the surface in the microporosity of the crystalline structure [3]. It can then be expected that the dielectric relaxation properties of a given zeolite is strongly dependent on its framework features, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it was shown that DRS is also very sensitive to the presence of guest molecules adsorbed in the nanoporosity where EFC sit [3][4][5][6][7]. This is particularly true when the adsorbed molecule is small and polar, e.g.…”

Section: Introductionmentioning

confidence: 99%

Insights into cation exchange selectivity of a natural clinoptilolite by means of dielectric relaxation spectroscopy

et al. 2011

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To cite this version:Gerardo Rodriguez-Fuentees, Sabine Devautour-Vinot, Sekou Diaby, François Henn. Insights into cation exchange selectivity of a natural clinoptilolite by means of dielectric relaxation spectroscopy. Phys. Chem. Minerals, 2011, 38 (xx) ABSTRACT.Purified natural clinoptilolite from the Tasajeras deposit, Cuba, and some of its metal exchanged forms are studied, at the dehydrated state, by means of Dielectric Relaxation Spectroscopy (DRS) using two different modus operandi: Complex Impedance Spectroscopy and Dielectric Dynamic Thermal Analysis. Data analysis yields the determination of the extra-framework cation (EFC) population into the various possible crystallographic sites of the zeolitic framework as well as of the activation energy characterizing the localized hopping mechanism of EFC. First, it is shown that the DRS responses obtained here match well with the previous reported data which were previously localized EFCs in positions close to M1 and M2 sites when the clinoptilolite is modified to almost homoionic form. From this outcome, it can be concluded that all EFCs are in the same crystallographic situation regarding solvation or, in other terms, that no steric effect can be taken into account to explain cationic selectivity. Second, based on the assumption that the activation energy for EFC hopping is directly connected to the EFC/framework interaction and on simple thermodynamics consideration, we show this interaction does not govern the EFC 2 exchange reaction. So, it is emphasized that EFC/H 2 O interaction is the key factor for cation exchange selectivity.

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Molecular Mobility in Microporous Architectures: Conductivity and Dielectric Relaxation Phenomena in Natural and Synthetic Zeolites

Cited by 40 publications

References 137 publications

Electrical Properties of Microdischarge in Porous Zeolites

Electrical Properties of Microdischarge in Porous Zeolites

Десорбция Положительных Ионов Металла С Поверхности Массивного Анода На Пластину Цеолита

Insights into cation exchange selectivity of a natural clinoptilolite by means of dielectric relaxation spectroscopy

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