Internally Structured Polyelectrolyte Multilayers
Internally Structured Polyelectrolyte Multilayers
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内部结构聚电解质多层膜
DOI：
10.1002/3527600574.ch7
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发表时间：
2003
影响因子：
24.7
通讯作者：
P. Vuillaume
中科院分区：
文献类型：
--
作者：
K. Glinel;A. Jonas;A. Laschewsky;P. Vuillaume
We report on the internal structure of a series of layer-by-layer (LBL) self-assembled polyelectrolyte films, mostly analyzed by X-ray reflectometry. Most binary (A/B) n systems based on organic polyelectrolytes do not form well-defined strata in LBL-films. However, we found a category of polycations giving rise to much better stratified (A/B) n multilayers: Stratification results from prestructuring of the polycations in the swollen layer adsorbed at the film/water interface, due to the formation of lamellar lyotropic mesophases. We compare the internal structure of such organic films with that of binary (A/B) n hybrid multilayers made from clay platelets and a large set of organic polycations. The main difference between these systems lies in the compliance of the lamellae and its consequences on ordering, which for organic systems may extend over very long ranges, or be destroyed completely during complexation in the film, while being limited to a few tens of Å for hybrid films. For both types of internally structured binary LBL films, there is no direct correspondence between the number of strata deposited and the number of dipping cycles and so it is impossible to control the composition of each stratum in turn. Therefore, other strategies have to be developed in order to design well compartmentalized assemblies allowing the confinement of functional molecules at precise positions within the stratified structure. This is possible by the construction of superlattices containing organic compartments of well-defined and tunable thickness separated by hybrid organic/inorganic barriers.
