Self-organized microporous structures based on surfactant-encapsulated polyoxometalate complexes.
Self-organized microporous structures based on surfactant-encapsulated polyoxometalate complexes.
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DOI：
10.1021/jp064535b
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
Hang Sun;Haolong Li;W. Bu;Miao Xu;Lixin Wu
中科院分区：
文献类型：
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作者：
Hang Sun;Haolong Li;W. Bu;Miao Xu;Lixin Wu
以有序凝聚液滴为模板，制备了一系列表面活性剂包裹的聚氧乙烯酸盐复合物（SEC）自组装微孔结构。在这些结构中，以（多达）（12）H[Eu（SiW（11）O（39））2]（SEC-1）为例，获得了有序的蜂窝结构并对其进行了详细表征。光学显微镜、原子力显微镜和扫描电子显微镜测量证实了三维微孔结构的形成，其中顶面显示出高度有序的蜂窝结构。与普通的溶剂浇铸膜相比，相应的蜂窝膜具有更好的疏水性和更有序的层状结构。润湿性和SEC的尺寸对微孔结构的形成有重要影响。合适的疏水性是形成蜂窝状薄膜的重要因素，大尺寸的SEC有利于制备高度有序的蜂窝状结构。不同的表面形态的形成的条件进行了讨论，在水和氯仿之间的界面处的SECs的接触角，和接触角略大于90度被发现是形成蜂窝结构的先决条件。本文的研究结果不仅有助于进一步理解蜂窝结构的形成机理，而且对以有机/纳米复合物为代表的有机/无机杂化材料的有序微孔膜的设计具有一定的指导意义。
Self-organized microporous structures based on a series of surfactant-encapsulated polyoxometalate complexes (SECs) have been prepared by using ordered condensed droplets as a template. Among these structures, ordered honeycomb structures were obtained and characterized in detail by taking (DODA)(12)H[Eu(SiW(11)O(39))2] (SEC-1) as an example. Optical microscope, atomic force microscopic, and scanning electron microscopic measurements confirmed the formation of three-dimensional microporous structure, in which the top surface shows a highly ordered honeycomb structure. As compared to common solvent-casting films, the corresponding honeycomb films are more hydrophobic and possess more ordered lamellar structures. Both the wettability and the size of SECs exert significant influence on the formation of microporous structures. The proper hydrophobicity of SECs was proposed to be an essential factor for the formation of honeycomb films, and large-sized SECs are favorable for the fabrication of highly ordered honeycomb structures. The conditions for the formation of different surface morphologies have been discussed in terms of the contact angle of SECs at the interface between water and chloroform, and a contact angle slightly greater than 90 degrees is found to be a prerequisite for the formation of honeycomb structures. The results reported in this paper not only help to further comprehend the mechanism of the formation of honeycomb structures, but also provide some guidance for the design of ordered microporous films based on organic/inorganic hybrid materials, exemplified by the organic/nanoparticle complexes.