Photoswitchable gel assembly based on molecular recognition.
Photoswitchable gel assembly based on molecular recognition.
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DOI：
10.1038/ncomms1617
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发表时间：
2012-01-03
影响因子：
16.6
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中科院分区：
文献类型：
--
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在自下而上或自上而下的过程中形成有效和精确的联系对于自组装材料的开发非常重要。通过分子识别事件的自组装是制备功能化材料的有力工具。光响应分子识别系统可以允许产生光调节的自组装宏观物体。在这里，我们表明，宏观凝胶组装可以高度调节通过光异构化的偶氮苯部分，不同的相互作用与两个主机分子。一个光调控的凝胶组装系统开发使用聚丙烯酰胺基的水凝胶功能化偶氮苯（客体）或环糊精（主体）部分。主体凝胶与客体凝胶的可逆粘附和解离可以通过光照射来控制。利用α-环糊精或β-环糊精对反式偶氮苯和顺式偶氮苯的不同亲和性，构建了光开关凝胶组装体系。 通过分子识别事件的自组装用于生产功能化材料。这项研究表明，宏观凝胶组装可以通过光异构化的偶氮苯部分，不同的相互作用与两个主机分子进行调节。
The formation of effective and precise linkages in bottom-up or top-down processes is important for the development of self-assembled materials. Self-assembly through molecular recognition events is a powerful tool for producing functionalized materials. Photoresponsive molecular recognition systems can permit the creation of photoregulated self-assembled macroscopic objects. Here we demonstrate that macroscopic gel assembly can be highly regulated through photoisomerization of an azobenzene moiety that interacts differently with two host molecules. A photoregulated gel assembly system is developed using polyacrylamide-based hydrogels functionalized with azobenzene (guest) or cyclodextrin (host) moieties. Reversible adhesion and dissociation of the host gel from the guest gel may be controlled by photoirradiation. The differential affinities of α-cyclodextrin or β-cyclodextrin for the trans-azobenzene and cis-azobenzene are employed in the construction of a photoswitchable gel assembly system. Self-assembly through molecular recognition events is used in the production of functionalized materials. This study shows that macroscopic gel assembly can be regulated through photoisomerization of an azobenzene moiety that interacts differently with two host molecules.
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