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- W2066303670 abstract "The mechanism of ambient pressure encapsulation of He and Ne in the α and β crystalline cages of type-A zeolites is demonstrated. Reversible and highly selective gas admission and entrapment are readily achieved at characteristic temperatures occurring between 77 and 570 K. The permeability of the zeolitic windows is governed by an interplay between the critical diameter of the encapsulate and the effective apertures dimension, which is shown to be strongly dependent on temperature. The blocking state of the zeolitic apertures is determined by a simultaneous thermal activation of both cation mobility and structural dilation/constriction of crystalline windows. Encapsulation in NaA (4A) principally occurs in the β cages of the Sodalite units, whereas the K-exchange form (3A) offers both α and β encapsulations. The effective free aperture dimension of the Ca exchange form (5A) is found to be too large to allow a practical gas enfoldment in either class of cavities, even at 77 K, where only poor encapsulation is observed. The counterion location vs size dependence, known only from crystallographic data, is sensed here for the first time by an encapsulation process, via the manifestation of different aperture occupancy states. While the blocking extent of the wider O8 windows of the α cages is consistent with the size of exchangeable cations, a reverse correlation is evident for the narrower O6 windows of the β cages." @default.
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- W2066303670 date "2003-07-30" @default.
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- W2066303670 title "Study of Type-A Zeolites. Part 1: Mechanism of He and Ne Encapsulation" @default.
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- W2066303670 doi "https://doi.org/10.1021/jp034644f" @default.
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