Title of article :
Improved dimensional stability of Nafion membrane modified using a layer by layer self-assembly of biophilic polymers
Author/Authors :
Lee، نويسنده , , Hye Jin and Nam، نويسنده , , Eun Ji and Woo، نويسنده , , Jung-Je and Moon، نويسنده , , Seung-Hyeon and Lee، نويسنده , , Jaeyoung، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 2012
Pages :
4
From page :
1235
To page :
1238
Abstract :
The modification of perfluorinated proton exchange membranes (e.g. Nafion) utilizing a layer by layer (LbL) electrostatic assembly of oppositely charged biophilic polymers such as poly-l-lysine as positive layer and dsDNA as a negative layer is developed to protect the interface between the catalyst layer and the membrane in a low temperature fuel cell. Various physicochemical measurements including water uptake, proton conductivity and surface tension were investigated for both the as-received Nafion and the biopolymeric LbL modified Nafion. The smaller water contact angle and the less swelling characteristics of the biopolymer modified Nafion membrane was founded compared to that of as-received Nafion. This clearly indicates that the more hydrophilic surface of biopolymeric layers on Nafion plays an important role in the enhanced dimensional stability. In addition, a potential hypothesis explaining the higher proton conductivity from the LbL biopolymeric film coated Nafion is suggested.
Keywords :
Dimensional stability , Fuel cell , wettability , Layer by layer self-assembly , Nafion , Biophilic polymer
Journal title :
Current Applied Physics
Serial Year :
2012
Journal title :
Current Applied Physics
Record number :
1789604
Link To Document :
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