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Channel orientation anisotropy in perfluorosulfonic acid/SiO2 composite proton exchange membranes: Water self-diffusion study using NMRстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 ноября 2017 г.
- Авторы: Filipoi C., Demco D.E., Zhu X.M., Vinokur R., Conradi O., Fechete R., Moller M.
- Журнал: Chemical Physics Letters
- Том: 513
- Год издания: 2011
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 251
- Последняя страница: 255
- DOI: 10.1016/j.cplett.2011.08.006
- Аннотация: A diffusion-exchange model with the assumption of two water pools was applied to describe the water transport in perfluorinated sulfonic acid (PFSA)/SiO2 nanocomposites. The water diffusivity in-plane and through-plane in solution cast films was measured by NMR revealing higher in-plane mobility. Both diffusion coefficients reached maxima at similar to 3%-wt. concentration in SiO2. The anisotropy of the PFSA channels orientation reflected in the diffusivity anisotropy decreased with the increase in the nanofiller content. Water exchange rates reached a maximum at low concentration of silica. Gaussian displacement distribution for water diffusion was detected in PFSA membrane at 40 degrees C independent of the direction of gradient for small concentration in silica.
- Добавил в систему: Чжу Сяоминь