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Field-structured proton exchange mem...

Boob, Smita Brijmohan.

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Field-structured proton exchange membranes for fuel cells.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Field-structured proton exchange membranes for fuel cells./
Author:	Boob, Smita Brijmohan.
Description:	124 p.
Notes:	Adviser: Montgomery T. Shaw.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3252571

Field-structured proton exchange membranes for fuel cells.
Boob, Smita Brijmohan.

Field-structured proton exchange membranes for fuel cells. - 124 p.

Adviser: Montgomery T. Shaw.

Thesis (Ph.D.)--University of Connecticut, 2007.

Fuel cells offer promising energy solutions that are reliable and available. Since conventional fuel cell types such as solid-oxide fuel cells require expensive materials extreme operating conditions, proton exchange membrane-based fuel cells (PEMFC) have attracted the attention of industry, especially for transportable applications. The goal of this research was to develop and study the properties of novel polymer membranes for possible application in direct methanol fuel cells (DMFC). Of particular interest were membranes based on proton-conducting micro and nano particles dispersed in a curable or solvent-based matrix. To this end, nanoparticles of sulfonated crosslinked polystyrene (SXLPS) were synthesized by emulsion and emulsifier-free emulsion polymerizations. Particles with ion exchange capacity (IEC) of up to 2.2 meq/g were obtained and used in the fabrication of PEMs. The morphology of the membrane was modified by aligning the SXLPS particles in the matrix using electric field. Direct proton-transport routes were formed which in turn enhanced the proton conductivity of the membranes. While inexpensive and straightforward, electric fields have practical and fundamental limitations which suggested the use of magnetic fields. For particle alignment in magnetic field, composite nanoparticles were synthesized which had reasonable ion exchange capacity as well as magnetic susceptibility. The morphologies observed in the composite particles were explained using a synthesis model. Membranes were fabricated by aligning the acidic SXLPS particles with an external magnetic field of 0.1 Tesla, which is easily achievable in an industrial scale.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Field-structured proton exchange membranes for fuel cells.
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005 20110517
008 110517s2007 ||||||||||||||||| ||eng d
035 $a (UMI)AAI3252571
035 $a AAI3252571
040 $a UMI $c UMI
100 1 $a Boob, Smita Brijmohan. $3 1263653
245 1 0 $a Field-structured proton exchange membranes for fuel cells.
300 $a 124 p.
500 $a Adviser: Montgomery T. Shaw.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1004.
502 $a Thesis (Ph.D.)--University of Connecticut, 2007.
520 $a Fuel cells offer promising energy solutions that are reliable and available. Since conventional fuel cell types such as solid-oxide fuel cells require expensive materials extreme operating conditions, proton exchange membrane-based fuel cells (PEMFC) have attracted the attention of industry, especially for transportable applications. The goal of this research was to develop and study the properties of novel polymer membranes for possible application in direct methanol fuel cells (DMFC). Of particular interest were membranes based on proton-conducting micro and nano particles dispersed in a curable or solvent-based matrix. To this end, nanoparticles of sulfonated crosslinked polystyrene (SXLPS) were synthesized by emulsion and emulsifier-free emulsion polymerizations. Particles with ion exchange capacity (IEC) of up to 2.2 meq/g were obtained and used in the fabrication of PEMs. The morphology of the membrane was modified by aligning the SXLPS particles in the matrix using electric field. Direct proton-transport routes were formed which in turn enhanced the proton conductivity of the membranes. While inexpensive and straightforward, electric fields have practical and fundamental limitations which suggested the use of magnetic fields. For particle alignment in magnetic field, composite nanoparticles were synthesized which had reasonable ion exchange capacity as well as magnetic susceptibility. The morphologies observed in the composite particles were explained using a synthesis model. Membranes were fabricated by aligning the acidic SXLPS particles with an external magnetic field of 0.1 Tesla, which is easily achievable in an industrial scale.
520 $a Typical properties of fuel cell membranes including proton conductivity, water and methanol absorption and permeability, and state of water were studied. It was observed that at SXLPS loading of more than 35 wt%, the membranes had proton conductivities comparable to the standard material, NafionRTM 112. However, the methanol permeability was lower than Nafion RTM 112 for up to 40 wt% SXLPS loading. Low methanol permeability is beneficial for DMFC application. Finally, the effect of particle size, loading, ion exchange capacity and membrane microstructure on the fuel cell properties were studied and analyzed.
590 $a School code: 0056.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 $a University of Connecticut. $3 1017435
773 0 $t Dissertation Abstracts International $g 68-02B.
790 $a 0056
790 1 0 $a Shaw, Montgomery T., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3252571