Near-surface structure of Nafion in deuterated water

被引：31

作者：

Bunkin, N. F. ^{[1
]}

Shkirin, A. V. ^{[2
,3
]}

Kozlov, V. A. ^{[1
]}

Ninham, B. W. ^{[4
]}

Uspenskaya, E. V. ^{[5
]}

Gudkov, S. V. ^{[2
,6
,7
]}

机构：

[1] Bauman Moscow State Tech Univ, Second Baumanskaya Str 5, Moscow 105005, Russia

[2] Russian Acad Sci, Prokhorov Gen Phys Inst, Vavilova Str 38, Moscow 119991, Russia

[3] Natl Res Nucl Univ MEPhI, Kashirskoe Sh 31, Moscow 115409, Russia

[4] Australian Natl Univ, Acton, ACT 2601, Australia

[5] RUDN Univ, Miklukho Maklaya Str 6, Moscow 117198, Russia

[6] Lobachevsky State Univ Nizhni Novgorod, Gagarina Ave 23, Nizhnii Novgorod 603950, Russia

[7] Moscow Reg Res & Clin Inst MONIKI, Shchepkina Str 61-2, Moscow 129110, Russia

来源：

JOURNAL OF CHEMICAL PHYSICS | 2018年 / 149卷 / 16期

基金：

俄罗斯基础研究基金会;

关键词：

MONTE-CARLO SIMULATIONS; CARBON NANOTUBES; FLUORESCENCE SPECTROSCOPY; HYDROGEN ADSORPTION; STORAGE; PHYSISORPTION; DEUTERIUM; MEMBRANES; DYNAMICS; POLYMER;

D O I：

10.1063/1.5042065

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：

The swelling of a polymer ion-exchange membrane Nafion in water with various heavy isotope contents (D2O) was studied by photoluminescent UV spectroscopy. The photoluminescence arises because of the presence of sulfonic groups attached to the ends of the perfluorovinyl ether groups that form the tetrafluoroethylene (Teflon) backbone of Nafion. The width of the colloidal region, which is formed near the membrane surface as a result of the outgrowth of Nafion microfibers toward the bulk liquid, varies non-monotonically with D2O content, displaying a narrow maximum in the low concentration region. A significant insight into the unexpected isotopic effects revealed in swelling Nafion in deuterated water is provided. Mainly, the polymer swelling is very sensitive to small changes (on the order of several tens of parts per million) in the content of deuterium, which, for instance, can help in understanding the isotopic effects in living tissues. Published by AIP Publishing.

引用

页数：10

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