Construction of metal-ligand-coordinated multilayers and their selective separation behavior.
Construction of metal-ligand-coordinated multilayers and their selective separation behavior.
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DOI：
10.1021/la9035453
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Guojun Zhang;Zhengang Ruan;S. Ji;Zhong-zhou Liu
中科院分区：
文献类型：
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作者：
Guojun Zhang;Zhengang Ruan;S. Ji;Zhong-zhou Liu
在这篇文章中，层层（LbL）组装的平面和3D基板上的配位多层膜的探索通过交替沉积的过渡金属的含配体的聚合物和含配体的聚合物通过形成配合物。用UV-vis、FTIR和XPS研究了Co（2+）交换的聚苯乙烯磺酸盐（PSS）和聚4-乙烯基吡啶（P4 VP）结构单元之间的金属配位作用。通过表面轮廓仪、扫描电镜、原子力显微镜和接触角分析仪系统地研究了膜的厚度、结构和形貌以及润湿性与双层数的关系。为了分离应用的目的，金属配体配位的多层组装在平板和中空纤维聚合物多孔基底上使用动态压力驱动的LbL技术。结果表明，LbL组装的PSS（Co）（1/2）/P4 VP多层膜对不同的溶剂-水混合物均具有良好的脱水性能，对芳香族-脂肪族烃具有选择性渗透，并具有一定的软化水能力.同时，多层膜在中空纤维上的成功组装表明，动态压力驱动的LbL技术是一种独特的方法来构建多孔三维基板上的多层膜。因此，金属配体配位的自组装可能成为一种强大的技术，用于制备一系列不同类型的模块中的分离膜。
In this article, a layer-by-layer (LbL)-assembled coordination multilayer on planar and 3D substrates was explored by the alternate deposition of a transition-metal-containing polyelectrolyte and a ligand-containing polymer via the formation of complexes. The metal-ligand coordination between the building blocks of Co(2+)-exchanged poly(styrene sulfonate) (PSS) and poly(4-vinyl pyridine) (P4 VP) has been demonstrated using UV-vis, FTIR, and XPS. The film thickness, structure, and morphology as well as the wettability as a function of bilayer number have been systematically investigated by profilometry, SEM, AFM, and contact angle analyzers. For the purpose of separation applications, the metal-ligand-coordinated multilayer was assembled on both flat sheet and hollow fiber polymeric porous substrates using a dynamic pressure-driven LbL technique. It was demonstrated that the LbL-assembled PSS(Co)(1/2)/P4 VP multilayer membrane had high dehydration performance with respect to different solvent-water mixtures; it also had aromatic compound permselectivity from aromatic-aliphatic hydrocarbons and water-softening capacity. Meanwhile, the successful assembly of multilayers on hollow fibers indicates that the dynamic pressure-driven LbL technique is a unique approach to the construction of multilayers on porous 3-D substrates. Therefore, the metal-ligand-coordinated self-assembly could emerge as a powerful technique for the preparation of a range of separation membranes in different types of modules.