Absence of Schroeder's Paradox in a Nanostructured Block Copolymer Electrolyte Membrane

被引：13

作者：

Beers, Keith M. ^{[1
,2
,6
]}

Yakovlev, Sergey ^{[2
]}

Jackson, Andrew ^{[3
,7
,8
,9
]}

Wang, Xin ^{[3
]}

Hexemer, Alexander ^{[4
]}

Downing, Kenneth H. ^{[5
]}

Balsara, Nitash P. ^{[2
,3
,6
]}

机构：

[1] Exponent, Natick, MA 01760 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Life Sci Div, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA

[7] European Spallat Source ESS AB, S-22100 Lund, Sweden

[8] Univ Delaware, Dept Chem Engn, Newark, DC 19716 USA

[9] NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2014年 / 118卷 / 24期

关键词：

HUMID AIR; CONDUCTIVITY; NAFION; EQUILIBRIUM; TRANSITIONS; DISORDER; CELLS; MODEL;

D O I：

10.1021/jp501374r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This is a study of morphology, water uptake, and proton conductivity of a sulfonated polystyrene-block-polyethylene (PSS-PE) copolymer equilibrated in humid air with controlled relative humidity (RH), and in liquid water. Extrapolation of the domain size, water uptake, and conductivity obtained in humid air to RH = 100% allowed for an accurate comparison between the properties of PSS-PE hydrated in saturated vapor and in liquid water. We demonstrate that extrapolations of domain size and water uptake on samples equilibrated in humid air are consistent with measurements on samples equilibrated in liquid water. Small (5%) differences in proton conductivity were found in samples equilibrated in humid air and liquid water. We argue that differences in transport coefficients in disordered heterogeneous systems, particularly small differences, present no paradox whatsoever. Schroeder's Paradox, wherein properties of polymers measured in saturated water vapor are different from those obtained in liquid water, is thus not observed in the PSS-PE sample.

引用

页码：6785 / 6791

页数：7

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