Gas Permeation in Perflurosulphonated Membranes ... - ScienceDirect

12 downloads 0 Views 414KB Size Report
In the present study, gas permeability in two different PFSI, namely Nafion® and $quivion®, has been investigated as a function of temperature and relative ...
Available online at www.sciencedirect.com

Procedia Engineering 44 (2012) 837 – 839

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Š

Š

,QWKHSUHVHQWVWXG\JDVSHUPHDELOLW\LQWZRGLIIHUHQW3)6,QDPHO\1DILRQ DQG$TXLYLRQ KDV EHHQLQYHVWLJDWHGDVDIXQFWLRQRIWHPSHUDWXUHDQGUHODWLYHKXPLGLW\,QSDUWLFXODUSHUPHDWLRQRI JDVHVVXFKDV21DQG&2DQGDOVR+HOLXPXVHGWRPLPLF+KDYHEHHQVWXGLHGIURP WRƒ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

1877-7058 © 2012 Published by Elsevier Ltd. Open access under CC BY-NC-ND license. doi:10.1016/j.proeng.2012.08.591

838

M. Giacinti Baschetti et al. / Procedia Engineering 44 (2012) 837 – 839

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

 )LJXUH$FWLYDWLRQHQHUJ\RIWKHSHUPHDWLRQSURFHVVLQ36),DQGSXUHZDWHUGDWDIRUQLWURJHQ DQGR[\JHQ  5HIHUHQFHV 

M. Giacinti Baschetti et al. / Procedia Engineering 44 (2012) 837 – 839

 )XHO &HOO +DQGERRN WK (GLWLRQ  (* * 7HFKQLFDO 6HUYLFHV ,QF   &RQWUDFW 1R '($0)7  0DUFLQNRVNL - .RSDV] -  %HQMDPLQ 7 3URJUHVV LQ WKH 86 '2( IXHO FHOO VXESURJUDPHIIRUWVLQSRO\PHUHOHFWURO\WHIXHOFHOOV,QW-+\GURJHQ(QHUJ\  6DNDL77DNHQDNR+:DNDED\DVKL1.DZDPL