Photoreactive azido-containing silica nanoparticle/polycation multilayers: durable superhydrophobic coating on cotton fabrics.
Photoreactive azido-containing silica nanoparticle/polycation multilayers: durable superhydrophobic coating on cotton fabrics.
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DOI：
10.1021/la300281q
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
Yan Zhao;Zhiguang Xu;Xungai Wang;Tong Lin
中科院分区：
文献类型：
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作者：
Yan Zhao;Zhiguang Xu;Xungai Wang;Tong Lin
在这项研究中，我们报告了具有高度光反应性的苯基叠氮基的二氧化硅纳米颗粒的功能化及其作为带负电荷的构建单元的实用性，用于逐层（LBL）静电组装以产生稳定的二氧化硅纳米颗粒涂层。通过3-氨丙基三甲氧基硅烷对裸二氧化硅纳米粒子进行官能化，然后与4-叠氮基苯甲酸反应，制备了叠氮基封端的二氧化硅纳米粒子。通过FTIR和XPS证实了叠氮基的功能化。聚（烯丙基胺盐酸盐）也接枝与苯基叠氮基团，并用作光反应性聚阳离子的LBL组装。对于光反应性二氧化硅纳米颗粒/聚阳离子多层膜，UV照射可以通过叠氮基光化学反应（包括与周围分子的C-H插入/夺取反应和叠氮基的二聚化）诱导多层膜内的共价交联以及多层膜锚定到有机基底上。我们的研究结果表明，二氧化硅纳米粒子/聚阳离子多层膜的稳定性大大提高后，紫外线照射。结合氟烷基硅烷后处理，光反应LbL多层膜被用作超疏水改性棉织物的涂层。在本文中，LbL组装方法使我们能够通过组装循环来定制涂覆的二氧化硅纳米颗粒的数量。棉织物的超疏水性对酸、碱和有机溶剂以及反复机洗具有耐久性。由于独特的叠氮基光化学，这里用于锚二氧化硅纳米颗粒的方法适用于几乎任何有机基底。
In this study, we report the functionalization of silica nanoparticles with highly photoreactive phenyl azido groups and their utility as a negatively charged building block for layer-by-layer (LbL) electrostatic assembly to produce a stable silica nanoparticle coating. Azido-terminated silica nanoparticles were prepared by the functionalization of bare silica nanoparticles with 3-aminopropyltrimethoxysilane followed by the reaction with 4-azidobenzoic acid. The azido functionalization was confirmed by FTIR and XPS. Poly(allylamine hydrochloride) was also grafted with phenyl azido groups and used as photoreactive polycations for LbL assembly. For the photoreactive silica nanoparticle/polycation multilayers, UV irradiation can induce the covalent cross-linking within the multilayers as well as the anchoring of the multilayer film onto the organic substrate, through azido photochemical reactions including C-H insertion/abstraction reactions with surrounding molecules and dimerization of azido groups. Our results show that the stability of the silica nanoparticle/polycation multilayer film was greatly improved after UV irradiation. Combined with a fluoroalkylsilane post-treatment, the photoreactive LbL multilayers were used as a coating for superhydrophobic modification of cotton fabrics. Herein the LbL assembly method enables us to tailor the number of the coated silica nanoparticles through the assembly cycles. The superhydrophobicity of cotton fabrics was durable against acids, bases, and organic solvents, as well as repeated machine wash. Because of the unique azido photochemistry, the approach used here to anchor silica nanoparticles is applicable to almost any organic substrate.