Multiple thin film formation from dilute mixtures of polyethyleneimine (PEI) and cetyltrimethylammonium bromide (CTAB).

Multiple thin film formation from dilute mixtures of polyethyleneimine (PEI) and cetyltrimethylammonium bromide (CTAB).
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由聚乙烯亚胺 (PEI) 和十六烷基三甲基溴化铵 (CTAB) 的稀释混合物形成多重薄膜。

DOI:
10.1016/j.jcis.2009.07.067
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发表时间:
2009
影响因子:
9.9
通讯作者:
Comas-Rojas H
Comas-Rojas H
中科院分区:
化学1区
文献类型:
--
作者:
Comas-Rojas H

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水溶性聚合物聚乙烯亚胺(PEI)和阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)的稀释混合物在空气/溶液界面处形成介观结构薄膜。在本文中,我们表明,这些薄膜自发形成,达到平衡组成。当膜被去除时,新的固体膜迅速重新形成,当通过布鲁斯特角显微镜(BAM)检查时具有类似的形态。膜的连续去除导致一系列结构相似的膜,直到溶液中的表面活性剂的量接近成膜浓度的下限。使用表面活性剂选择性电位测定法获得的结果表明,初期的聚合物:表面活性剂聚集体是在一个位置,以迅速迁移到表面后,膜去除,介观结构形成之前。X-射线反射率表明,在不同PEI:CTAB组成下形成的膜保持具有相同d-间距特征的中间相规则结构,等于52.2nm。掠入射衍射测量表明,薄膜是由小晶粒排列在一个随机的粉末的方式,开发一个粗糙的表面形貌证明BAM。中心发现是PEI:CTAB膜形成时,溶液中的CTAB的量高于临界成膜浓度,非常接近临界聚集浓度(CAC),允许从相同的生长溶液形成几个平衡的膜。
Dilute mixtures of the water soluble polymer polyethyleneimine (PEI) and the cationic surfactant cetyltrimethylammonium bromide (CTAB) form mesostructured thin films at the air/solution interface. In this paper we show that these films form spontaneously, reaching an equilibrium composition. When the film is removed, a new solid film rapidly reforms, with a similar morphology when inspected by Brewster angle microscopy (BAM). Successive removal of films lead to a series of structurally similar films, until the amount of surfactant in solution approaches the lower limit of film forming concentration. The results obtained using surfactant-selective potentiometry suggest that the incipient polymer:surfactant aggregates are in a position to migrate to the surface rapidly after film removal, prior to mesostructure formation. X-ray reflectivity indicates that films formed at different PEI:CTAB compositions retain mesophase regular structures with the same d-spacing feature, equal to 52.2Å. Grazing incidence diffraction measurements indicate that films are composed of small crystallites arranged in a random powder fashion, developing a rough surface morphology evidenced by BAM. The central finding is that PEI:CTAB films form when the amount of CTAB in solution is higher than a critical film formation concentration, very close to the critical aggregation concentration (CAC), allowing the formation of several equilibrated films from the same growing solution.
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