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Water uptake profile in a model ion-...

Herbst, Daniel C.

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Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels./
Author:	Herbst, Daniel C.
Description:	82 p.
Notes:	Source: Dissertation Abstracts International, Volume: 76-05(E), Section: B.
Contained By:	Dissertation Abstracts International76-05B(E).
Subject:	Theoretical physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3668256
ISBN:	9781321432466

Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels.
Herbst, Daniel C.

Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels. - 82 p.

Source: Dissertation Abstracts International, Volume: 76-05(E), Section: B.

Thesis (Ph.D.)--The University of Chicago, 2014.

Ionic conductivity in a polymeric fuel cell requires water uptake. Previous theoretical studies of water uptake used idealized parameters. We report a parameter-free prediction of the water-swelling behavior of a model fuel cell membrane. The model polymers, poly(methyl-butylene)-block-poly(vinylbenzyl-trimethylamine) (PMB-b-PVBTMA), form lamellar domains that absorb water in humid air. We use the Scheutjens-Fleer methodology to predict the resulting change in lamellar structure and compare with x-ray scattering. The results suggest locally uniform water distributions. However, under conditions where a PVBTMA and water mixture phase-separate, the two phases arrange into stripes with a dilute stripe sandwiched between two concentrated stripes. A small amount of water enhances conductivity most when it is partitioned into such channels, improving fuel-cell performance.

ISBN: 9781321432466Subjects--Topical Terms:

2144760
Theoretical physics.

Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels.
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100 1 $a Herbst, Daniel C. $3 3180208
245 1 0 $a Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels.
300 $a 82 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-05(E), Section: B.
500 $a Advisers: Thomas A. Witten; Wendy W. Zhang.
502 $a Thesis (Ph.D.)--The University of Chicago, 2014.
520 $a Ionic conductivity in a polymeric fuel cell requires water uptake. Previous theoretical studies of water uptake used idealized parameters. We report a parameter-free prediction of the water-swelling behavior of a model fuel cell membrane. The model polymers, poly(methyl-butylene)-block-poly(vinylbenzyl-trimethylamine) (PMB-b-PVBTMA), form lamellar domains that absorb water in humid air. We use the Scheutjens-Fleer methodology to predict the resulting change in lamellar structure and compare with x-ray scattering. The results suggest locally uniform water distributions. However, under conditions where a PVBTMA and water mixture phase-separate, the two phases arrange into stripes with a dilute stripe sandwiched between two concentrated stripes. A small amount of water enhances conductivity most when it is partitioned into such channels, improving fuel-cell performance.
590 $a School code: 0330.
650 4 $a Theoretical physics. $3 2144760
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650 4 $a Alternative Energy. $3 1035473
650 4 $a Polymer chemistry. $3 3173488
650 4 $a Physical chemistry. $3 1981412
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773 0 $t Dissertation Abstracts International $g 76-05B(E).
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3668256