Ion distribution in multilayers of weak polyelectrolytes: A neutron reflectometry study

被引：25

作者：

Tanchak, Oleh M. ^{[1
]}

Yager, Kevin G. ^{[1
]}

Fritzsche, Helmut ^{[2
]}

Harroun, Thad ^{[2
,3
]}

Katsaras, John ^{[2
,4
,5
]}

Barrett, Christopher J. ^{[1
]}

机构：

[1] McGill Univ, Dept Chem, Montreal, PQ H3A 2K6, Canada

[2] Natl Res Council Canada, Canadian Neutron Beam Ctr, Chalk River, ON K0J 1J0, Canada

[3] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada

[4] Univ Guelph, Guelph Waterloo Phys Inst, Guelph, ON N2L 3G1, Canada

[5] Univ Guelph, Biophys Interdepartmental Grp, Guelph, ON N2L 3G1, Canada

来源：

JOURNAL OF CHEMICAL PHYSICS | 2008年 / 129卷 / 08期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1063/1.2943201

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：

Neutron reflectometry was used to determine the distribution of salt ions and water in thin poly (acrylic acid) and poly (allylamine hydrochloride) polyelectrolyte multilayers assembled with and without salt. Increasing salt concentration reverses the exclusion of water from the substrate region, eventually leading to an asymmetric segregation of water near the substrate at high salt concentration. The counterions were found to localize near the substrate in films that were either assembled with salt or were exposed to salt solutions. In addition, the capping layer of the film was found to greatly influence the counterion distribution in the multilayer. (C) 2008 American Institute of Physics.

引用

页数：10

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