Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria.
J Phys Condens Matter. 2010 Dec 15;22(49):494107. doi: 10.1088/0953-8984/22/49/494107.
The effect of ionic strength on the electrical properties of poly(styrene sulfonate)/poly(allylamine) (PSS/PAH) multilayer film was investigated using electric light scattering and electrophoresis. A multilayer film was created by sequential adsorption of fully charged polymers from solutions containing 10 (- 1) M NaCl and its properties were compared to those of a PSS/PAH film prepared in the absence of salt. All measurements were carried out after rinsing the films with an aqueous solution of HCl to adjust the pH to 4.6. We found that the electrical polarizability of the film coated particles and its frequency of relaxation increase when the film was constructed in the presence of salt. The increase in the electrical polarizability value is due to the screening-enhanced adsorption. We hypothesize that the increase in the relaxation frequency of the electrical polarizability is a consequence of the adsorption of the polymer chains in more coiled conformations. This restricts the movement of small ions to shorter distances than in the film prepared without salt. In both cases, the small ions are located near the film surface, which indicates the key role of the last deposited polymer for the behavior of the entire PSS/PAH film.
采用电动光散射和电泳研究了离子强度对聚（苯乙烯磺酸盐）/聚（烯丙胺）（PSS/PAH）多层膜电性能的影响。通过从含有 10（-1）M NaCl 的溶液中顺序吸附完全带电的聚合物来制备多层膜，并将其性质与在没有盐的情况下制备的 PSS/PAH 膜的性质进行了比较。所有测量均在用水冲洗薄膜以将 pH 值调节至 4.6 之后进行。我们发现，当在盐存在下构建膜时，涂覆颗粒的电可极化率及其弛豫频率增加。电可极化率值的增加是由于屏蔽增强的吸附。我们假设电可极化率弛豫频率的增加是聚合物链以更卷曲构象吸附的结果。这将限制小离子的运动距离比在没有盐制备的膜中更短。在这两种情况下，小离子都位于靠近膜表面的位置，这表明最后沉积的聚合物对整个 PSS/PAH 膜的行为起着关键作用。
