锂皂石为框架基质的光控可逆超分子有机-无机杂化水凝胶的构筑

项目名称： 锂皂石为框架基质的光控可逆超分子有机-无机杂化水凝胶的构筑

项目编号： No.21502039

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 李志强

作者单位： 河北工业大学

项目金额： 21万元

中文摘要： 利用超分子自组装构筑可控可逆智能材料已经成为当今材料科学、生命科学等领域的研究热点。然而，利用超分子非共价弱相互作用力构筑得到的材料质地较软，力学性能差，限制了其在某些特定领域的应用。在本项目中，我们拟将基于环糊精的超分子自组装与无机基质锂皂石相结合，设计并合成以锂皂石为框架基质，超分子非共价作用力为驱动力，兼具较高机械强度和可控可逆特性的有机-无机杂化水凝胶。另外，通过引入与环糊精尺寸匹配且具有光致异构特点的偶氮苯客体分子等手段，实现凝胶-溶胶过程的光控可逆调控。在此基础上，通过深入系统地研究该杂化宏观自组装过程的热力学参数和动力学参数，阐明该杂化宏观自组装过程的机理、模式、驱动力和影响因素等基础科学问题；研究所得水凝胶的机械性能和力学性能。该研究项目不仅具有非常重要的基础科学价值，同时还在生物填充材料、光响应探测器、可控稀土发光材料等领域具有重要的实际应用前景。

中文关键词： 有机-无机杂化；宏观自组装；水凝胶；环糊精；光刺激响应

英文摘要： Recently, the construction of reversible and controllable intelligent material by supramolecular self-assembly have attracted growing interest in the fields of material science and life science. However, materials with intermolecular weak interactions as drive force usually softness and show poor mechanical property, which has limited its applications in some special fields. The objective of this project is to design and construct novel organic-inorganic hybrid hydrogel with the feature of both high mechanical property and good reversibility by combination of supramolecular macrocyclic host-guest interaction and inorganic substrate. The introduction of laponite as scaffolds will effectively improve the mechanical strength of the gel while supramolecular noncovalent interaction gives the system excellent controllability and reversibility. Controllable and reversible sol-gel process will be achieved based on the photoisomerization of azophenyl moiety under light irradiation. In addition, the mechanism, control factor and drive force of this macroscopic self-assembly process will be expounded in detail by determining thermodynamic parameters and dynamic parameters. The mechanical properties of this hybrid hydrogel will be investigated by measuring the viscous coefficient and elastic coefficient. This study will provide theory and technology for fabricating high mechanical strength and bio-compatible hydrogel. Furthermore, our research play very important role in fundamental scientific research and a variety of application in the fields of biological material for filling, photo-responsive devices and controllable rare earth luminescent material.

英文关键词： organic-inorganic hybrid;macroscopic self-assembly;hydrogel;cyclodextrin;photo-responsive