At 14:00 p.m. on December 3, 2024, Professor Mingjie Liu from the School of Chemistry of Beijing University of Aeronautics and Astronautics, invited by Professor Huang Hui from the School of Materials Science and Optoelectronics Technology, held a lecture on the theme of " Biomimetic Functional Mechanics Polymer Materials " at Room 404, Building 1, Yanqihu Campus, University of Chinese Academy of Sciences (UCAS).
Professor Mingjie Liu graduated from the Department of Applied Chemistry at Beijing University of Chemical Technology in 2005 with a Bachelor of Science degree; In 2010, he graduated from the National Nanoscience Center of the Chinese Academy of Sciences with a doctor's degree in science. Professor Mingjie Liu is a Changjiang Scholar Distinguished Professor, recipient of the National Science Foundation for Distinguished Young Scholars, Chief Scientist of the National Key Research and Development Program, and currently serves as the Dean of the School of Chemistry at Beihang University. He is mainly committed to the design, preparation and application research of biomimetic functional mechanics polymer composites. He has published 120 papers in journals such as Nature, Nat. Rev. Mater., Nat. Commun., Sci. Adv., Angew., Adv. Mater., JACS, etc.
Professor Mingjie Liu first pointed out that polymer composite materials have been widely used in aviation, automotive, and green power generation fields due to their strong designability, excellent performance, and diverse functions. However, harsh environments such as lightweight, multifunctionality, high speed, and high temperature require higher performance and functionality of polymer composite materials. In the future composite system, it is necessary to establish an optimization model that links functional elements with macroscopic properties for multiphase composite, which is the key to improving material mechanical properties and expanding functionality. In addition, the polymer confinement effect in composite systems has a significant impact on the macroscopic performance control and optimization of materials, and it is necessary to understand the confinement effect from a molecular theoretical perspective.
Next, Professor Mingjie Liu used biomimetic materials as an example to explain how to achieve the integration of structure and function of biomaterials through the design of multiphase confinement composites and multi-level ordered structures. Mingjie Liu's research group used confined space to regulate molecular movement, and realized the independent movement of orthogonal networks in confined space, thus preparing orthogonal network oil-water gel, which successfully simulated various functions of muscles; Inspired by the fluid force field, the team utilized a super spreading shear fluid to regulate the layer by layer orientation of nanosheets, ensuring that the materials could be quickly assembled to form highly ordered structures, thus preparing high-strength and tough layered nanocomposites, simulating the lightweight and impact resistance characteristics of shells.
At the end of the lecture, Professor Mingjie Liu discussed with everyone whether hydrogels can replace human tissues, the material forming process and the application prospect of hydrogels in the field of optoelectronics. The lecture caused heated discussions among teachers and students. Professor Mingjie Liu's lecture not only deepened the understanding of biomimetic functional polymer materials among the attending teachers and students, but also provided valuable guidance for researchers.
