Layered polyelectrolyte films as selective, ultrathin barriers for anion transport

被引：175

作者：

Harris, JJ ^{[1
]}

Stair, JL ^{[1
]}

Bruening, ML ^{[1
]}

机构：

[1] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

来源：

CHEMISTRY OF MATERIALS | 2000年 / 12卷 / 07期

关键词：

D O I：

10.1021/cm0001004

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：

Synthesis of high-flux composite membranes requires methods for deposition of ultrathin, defect-free films on highly permeable supports. Layer-by-layer deposition of polyelectrolytes on porous alumina (0.02 mu m pore diameter) produces such membranes. Electron microscopy shows that five bilayers (<25 nm) of poly(allylamine hydrochloride) (PAH)/poly(styrenesulfonate) (PSS) are sufficient to cover porous alumina and that underlying pores are not clogged during the deposition process. The selectivity of anion transport through these membranes increases with the number of bilayers until the substrate is fully covered. Five-bilayer PAH/PSS membranes have Cl-/SO42- and Cl-/Fe(CN)(6)(3-) selectivity values of 7 and 310, respectively. PAH/poly(acrylic acid) membranes show selectivity values similar to those of PAH/PSS membranes but with a 3-fold decrease in anion flux. Selectivity in both of these systems likely results from Donnan exclusion.

引用

页码：1941 / 1946

页数：6

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