Comparison of the structure of polyelectrolyte multilayer films exhibiting a linear and an exponential growth regime: An in situ atomic force microscopy study

被引:464
作者
Lavalle, P
Gergely, C
Cuisinier, FJG
Decher, G
Schaaf, P
Voegel, JC
Picart, C
机构
[1] Univ Strasbourg 1, Federat Rech Odontol, INSERM, U424, F-67085 Strasbourg, France
[2] Inst Charles Sadron, CNRS, UPR 22, F-67083 Strasbourg, France
[3] Univ Strasbourg 1, Fac Chim, F-67008 Strasbourg, France
[4] Ecole Europeenne Chim Polymeres & Mat Strasbourg, F-67087 Strasbourg 2, France
关键词
D O I
10.1021/ma0119833
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We report here on the structural characterization of polyelectrolytes multilayer films formed by poly(L-glutamic acid) and poly(L-lysine) (PGA/PLL). The growth of this system is compared to that of poly(styrenesulfonate)/poly(allylamine hydrochloride) (PSS/PAH) multilayers by means of in situ atomic force microscopy (ATM) and by optical waveguide lightmode spectroscopy (OWLS). In contrary to the (PSS/PAH)(i) films that are growing linearly with the number of deposited layer pairs i, optical data evidenced that the (PGA/PLL)(i) films are characterized by an exponential growth. The analysis of the structure of the (PSS/PAH)(i) films reveals a smooth featureless surface covered by small globules. On the other hand, (PGA/PLL)(i) films form extended structures that appear with a vermiculate pattern. We propose a new growth mechanism based on polyelectrolyte diffusion in and out of the film coupled to the formation of polyanion/polycation complexes at the surface of the film in order to explain the whole results.
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收藏
页码:4458 / 4465
页数:8
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