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Dynamic properties of water in silicalite-1 powder

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dc.contributor.author Filippov A.
dc.contributor.author Dvinskikh S.
dc.contributor.author Khakimov A.
dc.contributor.author Grahn M.
dc.contributor.author Zhou H.
dc.contributor.author Furo I.
dc.contributor.author Antzutkin O.
dc.contributor.author Hedlund J.
dc.date.accessioned 2018-09-18T20:09:30Z
dc.date.available 2018-09-18T20:09:30Z
dc.date.issued 2012
dc.identifier.issn 0730-725X
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/137093
dc.description.abstract Self-diffusion of D2O in partially filled silicalite-1 crystals was studied at 25°C by 2H nuclear magnetic resonance (NMR) with bipolar field gradient pulses and longitudinal Eddy-current-delay. For the first time, reliable experimental diffusion data for this system were obtained. Analysis of NMR diffusion decays revealed the presence of a continuous distribution of apparent self-diffusion coefficients (SDCs) of water, ranging from 10-7 to ~10-10 m2/s, which include values much higher and lower than that of bulk water (~10-9 m2/s) in liquid phase. The observed distribution of SDC changes with variation of the diffusion time in the range of 10-200 ms. A two-site Kärger exchange model was successfully fitted to the data. Finally, the water distribution and exchange in silicalite-1 pores were described by taking into account (a) a gas-like phase in the zeolite pores, a gas-like phase in mesopores and an intercrystalline gas-like phase and (b) intercrystalline liquid droplets with intermediate exchange rate with the other phases. The other phases experience fast exchange on the NMR diffusion time scale. Diffusion coefficients and mean residence times of water in some of these states were estimated. © 2012 Elsevier Inc.
dc.relation.ispartofseries Magnetic Resonance Imaging
dc.subject "Gas phase"
dc.subject Background magnetic field gradients
dc.subject MFI
dc.subject Molecular exchange
dc.subject Nuclear magnetic resonance
dc.subject Zeolite
dc.title Dynamic properties of water in silicalite-1 powder
dc.type Article
dc.relation.ispartofseries-issue 7
dc.relation.ispartofseries-volume 30
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 1022
dc.source.id SCOPUS0730725X-2012-30-7-SID84863998026


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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