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            (Seminar) Active matter: a world far from equilibrium - thermodynamics, pattern formation, and complex environments
            2020-11-11  【 】【打印】【關閉

            CAS Key Laboratory of Theoretical Physics

            Institute of Theoretical Physics

            Chinese Academy of Sciences

             Seminar

            Title

            題目

            Active matter: a world far from equilibrium - thermodynamics, pattern formation, and complex environments

            Speaker

            報告人

            趙永峰

            Affiliation

            所在單位

            上海交通大學 自然科學研究院

            Date

            日期

            2020年11月11日(周三)下午4:00

            Venue

            地點

            騰訊會議:943 958 694

            Contact Person

            所內聯系人

            雷澤

            Abstract

            摘要

            Active matter, such as run-and-tumble bacteria, is a system with microscopic injection and dissipation of energy. It is a common non-equilibrium system in nature, which exhibits a lot of new physics outside the equilibrium world. In this talk, I will talk about my several recent work on active matter, especially bacterial systems. I will start with the surface tension in active systems: if there exists an equation of state of surface tension and how to measure it. It opens the way towards the generalized thermodynamics of active systems. [1] Then I will talk about how to engineer two strains of E. coli to form different patterns from reciprocal interactions. [2] To confirm the bacteria behaves as we engineered, we developed a high-throughput method, differential dynamic microscopy, to relate directly the kinetic parameters of bacteria with its molecular property. [3] Finally, I will talk about how the complex environment, such as semi-solid agar gel, alters the expansion of the bacteria colony.   References: [1] R. Zakine, Y. Zhao, M. Knezevic, A. Daerr, Y. Kafri, J. Tailleur, F. van Wijland, "Surface Tensions between Active Fluids and Solid Interfaces: Bare vs Dressed", Physical Review Letters 124, 248003 (2020). [2] A. I. Curatolo, N. Zhou, Y. Zhao, C. Liu, A. Daerr, J. Tailleur, J.-D. Huang, "Cooperative pattern formation in multi-species bacterial colonies", Nature Physics (2020). [3] C. Kurzthaler, Y. Zhao, N. Zhou, J. Schwarz-Linek, C. Devailly, J. Arlt, J. Huang, W. C. K. Poon, T. Franosch, J.Tailleur, V. A. Martinez, "Quantitative characterization of the run-and-tumble dynamics of Escherichia coli", unpublished.
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