Programmed internal stress induced three-dimensional deformation of hydrogels and superstructure formation of rigid macromolecules
讲座名称：
Programmed internal stress induced three-dimensional deformation of hydrogels and superstructure formation of rigid macromolecules
讲座时间：
2014-06-23
讲座人：
吴子良
形式：
校区：
兴庆校区
实践学分：
讲座内容：
报告名称：Programmed internal stress induced three-dimensional deformation of hydrogels and superstructure formation of rigid macromolecules
报告时间：2014年6月23日下午4:30-5:30
报告地点：化学系会议室207
报告人：吴子良 博士
报告内容： Nature utilizes controlled deformation strategies to produce complex three-dimensional (3D) shapes of proteins, soft biotissues, and plants. Inspired by natural activated systems, the realization of 3D shapes of artificial materials by programmed deformations has recently attracted great interest as a delightful concept and a practical technology. The significant point is to control the distribution of internal stress, which induces mechanical instability and thus complex deformation. We will present in this talk a photolithographic method to create “programmable”, well-defined regions with a varying polymer content and/or composition in planar gel sheets. The critical design rule is such that an activating external stimulus induces a large difference in swelling/shrinkage ratios and elastic moduli between different regions. The transformations of the planar sheets into 3D conformations such as cylindrical and conical helical structures are driven solely by in-plane forces, to reduce the stretching energy. In addition, the well-tuned internal stresses in photolithographic patterned gels are used to induce superstructure formation of rigid macromolecules, which are easily aligned parallel to the direction of tensile stress and perpendicular to the direction of compression stress.
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