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Using Indentation to Quantify Transport Properties of Nanophase‐Segregated Polymer Thin Films
Author(s) -
Nadermann Nichole K.,
Davis Eric M.,
Page Kirt A.,
Stafford Christopher M.,
Chan Edwin P.
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201501880
Subject(s) - thermal diffusivity , materials science , ionic bonding , indentation , thin film , nafion , phase (matter) , nanotechnology , composite material , ion , thermodynamics , chemistry , organic chemistry , physics , electrode , electrochemistry
Indentation of hydrated Nafion thin films reveals that both the in‐plane diffusivity of water and the intrinsic permeability of the phase‐segregated network decrease dramatically with decreasing film thickness. Using pore‐network theory, this decrease in diffusivity is attributed to both an increase in ionic‐domain heterogeneity and a reduction in ionic‐domain connectivity upon confinement.