The impact of electrolyte on the adsorption of sodium dodecyl sulfate/polyethyleneimine complexes at the air-solution interface.
The impact of electrolyte on the adsorption of sodium dodecyl sulfate/polyethyleneimine complexes at the air-solution interface.
复制标题
电解质对十二烷基硫酸钠/聚乙烯亚胺复合物在空气-溶液界面吸附的影响。
DOI：
10.1021/la063017p
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
X. L. Zhang
中科院分区：
文献类型：
--
作者：
J. Penfold;I. Tucker;R. Thomas;D. Taylor;J. Zhang;X. L. Zhang
电解质（0.1 M NaCl）的添加被证明有显着的影响后，表面活性剂的浓度和溶液的pH值依赖的吸附十二烷基硫酸钠（SDS）/聚乙烯亚胺（PEI）复合物在空气-溶液界面。在很宽的表面活性剂浓度范围内（从10（-6）至10（-）2 M）观察到大量吸附，并且在该浓度范围的大部分范围内，吸附的特征在于形成表面多层。表面多层的形成是最明显的在高pH值和PEI与较低的分子量为2K，相比，较高的分子量为25 K。从中子反射率和表面张力的组合获得的这些结果，突出了通过添加的聚乙烯醇，PEI，和一个简单的电解质的组合实现的表面活性剂吸附的大幅增强。此外，电解质对吸附的pH依赖性的影响进一步突出了疏水相互作用在表面活性剂/水溶性复合物形成中的重要性。
The addition of electrolyte (0.1 M NaCl) is shown to have a significant impact upon the surfactant concentration and solution pH dependence of the adsorption of sodium dodecyl sulfate (SDS)/polyethyleneimine (PEI) complexes at the air-solution interface. Substantial adsorption is observed over a wide surfactant concentration range (from 10(-6) to 10(-)2 M), and over much of that range of concentrations the adsorption is characterized by the formation of surface multilayers. The surface multilayer formation is most pronounced at high pH and for PEI with a lower molecular weight of 2K, compared to the higher molecular weight of 25K. These results, obtained from a combination of neutron reflectivity and surface tension, highlight the substantial enhancement in surfactant adsorption achieved by the addition of a combination of the polyelectrolyte, PEI, and a simple electrolyte. Furthermore the effect of electrolyte on the pH dependence of the adsorption further highlights the importance of the hydrophobic interaction in surface surfactant/polyelectrolyte complex formation.