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Multilamellar Interface Structures in Nafion

delete2009-06-12
delete162
PRE
AI
J
Joseph A. Dura *
V
Vivek S. Murthi
S
Sushil K. Satija
C
C. F. Majkrzak
DOI：10.1021/ma802823jdelete
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Abstract

Abstract

En 中文
Neutron reflectometry measurements show that lamellar structures composed of thin alternating water-rich and Nafion-rich layers exist at the interface between SiO2 and the hydrated Nafion film. Lamellae thickness and number of layers increase with humidity. Some lamellae remain in the film after dehydration. Multilayer lamellae are not observed for Nafion on Au or Pt surfaces. Instead, a thin partially hydrated single interfacial layer occurs and decreases in thickness to a few angstroms as humidity is reduced to zero. The absorption isotherm of the rest of the Nafion film is similar to that of bulk Nafion for all three surfaces investigated. The observed interfacial structures have implications for the performance, reliability. and improvements of fuel cell proton exchange membranes and membrane electrode assemblies.
Keywords:
NEUTRON REFLECTOMETRY
THICKNESS MEASUREMENTS
COMPOSITE MEMBRANES
WATER-UPTAKE
TRANSPORT
SURFACE
FILMS
REFLECTIVITY
DEGRADATION
SORPTION
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Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.

Journal

Macromolecules cover
Macromolecules
IF:
5.2
Papers:
3.7W
Citations:
9.4W

Organization

U
University of Michigan
Scholars:
6.4W
Papers: 5.3W
Citations: 124
N
national institute of standards & technology (nist) - usa
Scholars:
9.7K
Papers: 9.0K
Citations: 4
U
university of michigan system
Scholars:
9.1W
Papers: 8.6W
Citations: 133
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