报告题目：Hierarchical Co-assembly Enhanced Direct Ink Writing

报告人：  美国Dartmouth学院 李龙玉   博士

报告时间：2018年4月20日（周五）下午2：00

报告地点：存中楼233会议室

邀请人：高分子材料与工程研究所 王旭 教授

报告人简介：

李龙玉博士2009年本科毕业于南开大学化学系，2015年在美国University of Massachusetts Amherst化学系获得博士学位，师从S. Thayumanavan，随后在美国University of California Berkeley中Omar Yaghi课题组进行博士后研究。2017年七月开始在美国Dartmouth College中Chenfeng Ke课题组担任助理研究员。李龙玉博士主要在用于生物检测和递送的刺激响应性材料，用于3D打印技术的智慧型材料，及基于筑网化学的共价有机框架的设计和制备等方面做出一系列重要成果。发表论文21篇（一区7篇，二区11篇），其中以第一作者在国际化学顶尖期刊《Angew. Chem. Int. Ed.》上发表论文两篇。

报告内容简述：

The development of smart materials and devices has attracted increasing attention as a result of the demonstrated capability of altering their macroscale properties in a controlled manner. Integrating these synthetic functional materials with 3D printing technology, i.e. the extrusion-based direct ink writing (DIW) will allow us to amplify their nanoscale properties to the macroscale by taking advantage of the hierarchical nature of the controlled assembly and pre-designed complex 3D geometry. In this presentation, we report a general method based on hierarchical co-assembly by using supramolecular templates to facilitate shear-thinning and self-healing properties to overcome the obstacle of integrating functional small molecules into DIW-printable materials. The co-assembled supramolecular template and functional small molecules rapidly deform and reform during the DIW extrusion process. After extrusion, the molecular monomers and templates in the 3D printed monolith re-assemble dynamically upon external stimulus, e.g. controlled evaporation, affording functional monolith with enhanced printing resolution. After post-printing crosslinking and template removal, monoliths with predesigned macroscale architecture and molecular functions were obtained, which respond to external stimuli with dynamic fluorescent color changing and shape morphing.