The Adsorption of Oppositely Charged Polyelectrolyte/Surfactant Mixtures: Neutron Reflection from Dodecyl Trimethylammonium Bromide and Sodium Poly(styrene sulfonate) at the Air/Water Interface
The Adsorption of Oppositely Charged Polyelectrolyte/Surfactant Mixtures: Neutron Reflection from Dodecyl Trimethylammonium Bromide and Sodium Poly(styrene sulfonate) at the Air/Water Interface
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DOI：
10.1021/la011716q
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发表时间：
2002-05
期刊：
影响因子：
3.9
通讯作者：
D. Taylor;R. Thomas;J. Penfold
中科院分区：
文献类型：
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作者：
D. Taylor;R. Thomas;J. Penfold
用表面张力法和中子反射率法研究了阳离子表面活性剂十二烷基三甲基溴化铵（C12TAB）与阴离子聚合物聚苯乙烯磺酸钠（NaPSS）之间的相互作用。中子反射表明，表面由聚合物和表面活性剂的混合物组成，表面活性剂浓度范围从临界胶束浓度（CMC）的两倍到CMC的1/100，聚合物浓度在20和140 ppm之间。在较低的表面活性剂浓度范围内，吸附的表面活性剂的量近似对应于表面活性剂单层（每分子的面积= 50 A2），但在较高的浓度下，这增加到近似对应于三个吸附层的量（每分子的面积= 17 A2）。在吸附量中观察到类似的增加。吸附量的跳跃伴随着吸附层的总厚度从20埃增加到约60埃。基于中子的匹配...
The interactions between the cationic surfactant dodecyl trimethylammonium bromide (C12TAB) and the anionic polymer sodium poly(styrene sulfonate) (NaPSS) have been studied using surface tension and neutron reflectivity techniques. Neutron reflection shows that the surface consists of a mixture of polymer and surfactant over surfactant concentrations ranging from twice the critical micelle concentration (CMC) to 1/100 of the CMC for polymer concentrations between 20 and 140 ppm. In the lower surfactant concentration range the amount of surfactant adsorbed approximately corresponds to a surfactant monolayer (area per molecule ∼ 50 A2), but at a higher concentration this increases to an amount approximately corresponding to three adsorbed layers (area per molecule = 17 A2). A similar increase is observed in the amount of adsorbed polyelectrolyte. The jump in the adsorbed amounts is accompanied by an increase in the overall thickness of the adsorbed layer from 20 A to about 60 A. Based on fits to the neutron...