Ji QINGXIANG :"Intelligent thermal metamaterials"

Abstract : This thesis mainly focuses on thermal metamaterials, including thermal metadevices that can actively manipulate heat flux, and thermally responsive metamaterials that can deform in response to external heat stimuli in a controlled manner. We propose a method to design arbitrarily shaped 3D thermal cloaks with anisotropic and homogeneous material properties. Based on this approach, we study the steady-state and transient cloaking performance of multilayered cloaks. Then we propose a general road map to build thermal harvesting devices with microstructure design. The device is realized by naturally available materials. Both numerical and experimental results demonstrate good thermal harvesting performance. In addition to the above mentioned works on in-plane heat conduction control, we further propose a multilayered medium approach to flexibly manipulate out-of-plane thermal radiation. Based on this approach we realize functionalities like infrared camouflage, thermal coding and thermal illusion. Finally, we propose thermomechanical metamaterials that can generate basic deformations (translation and rotation) in reaction to heat stimuli. We verify their accurate, stable and reversible thermally induced performance by simulations and experiments. Actuation operation is also investigated.

Jury Composition : 

M. Vincent LAUDE Directeur de recherche Université Bourgogne Franche-Comté PhD Director
M. Chengwei QIU Professor National University of Singapore Reporter
M. Richard CRASTER Professor Imperial College London Reporter
M. Muamer KADIC Maître de conférences Université Bourgogne Franche-Comté PhD Co-supervisor
M. Jun LIANG Professor Beijing Institute of Technology PhD Co-supervisor
M. Gengkai HU Professor Beijing Institute of Technology Reviewer
M. Linzhi WU Professor Harbin Engineering University Reviewer
M. Xiangqiao YAN Professor Harbin Institute of Technology PhD Director

Localization : No.5 South Zhongguancun Street Haidian District Beijing 100081 China - Salle : 313