Interactions between quaternary ammonium surfactants and polyethylenimine at high pH in film forming systems.
Interactions between quaternary ammonium surfactants and polyethylenimine at high pH in film forming systems.
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DOI：
10.1016/j.jcis.2015.01.034
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发表时间：
2015-07
影响因子：
9.9
通讯作者：
R. Jaber;M. Wasbrough;J. Holdaway;K. Edler
中科院分区：
文献类型：
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作者：
R. Jaber;M. Wasbrough;J. Holdaway;K. Edler
假设在阳离子表面活性剂与聚乙烯亚胺的溶液上形成的膜中的膜形成和膜结构受表面活性剂结构的影响，包括尾长和头基的性质，实验合成了一系列阳离子表面活性剂，并通过电导率测量比较了这些表面活性剂的临界胶束浓度以及它们在聚乙烯亚胺存在和不存在下的行为小角中子散射测量被用来确定在聚合物存在和不存在下胶束的大小和形状。聚乙烯亚胺和各种表面活性剂之间的膜形成的trialed，和测量使用中子reflectivity.FindingsFilm形成的界面膜结构示出依赖于表面活性剂的尾部长度，与较厚的膜形成的表面活性剂具有较长的疏水性尾巴。表面活性剂头基结构影响胶束的抗衡结合，并且在芳香族头基的情况下，当添加聚合物时，头基影响胶束生长的程度。使用十六烷基溴化吡啶表面活性剂生长具有最大介观结构有序的膜。
HypothesisFilm formation and film structure in films formed on solutions of cationic surfactants with polyethylenimine is influenced by the surfactant structure, including both the tail length and the nature of the headgroup, which alter the micelle properties.ExperimentsA series of cationic surfactants were synthesized and conductivity measurements were used to compare the critical micelle concentrations for these surfactants and their behaviour with and without polyethylenimine at high pH. Small angle neutron scattering measurements were used to characterise the size and shape of the micelles in the presence and absence of the polymer. Film formation between polyethylenimine and the various surfactants was trialled, and the interfacial film structures measured using neutron reflectivity.FindingsFilm formation is shown to depend on surfactant tail length, with thicker films forming for surfactants with longer hydrophobic tails. The surfactant headgroup structure affects counterion binding to the micelles, and in the case of the aromatic headgroups, the headgroup affects the extent of micellar growth when polymer is added. Films with the greatest mesostructural ordering were grown using hexadecylpyridinium bromide surfactants.