题目：Understanding and Manipulating Thermal Transport in Polymers
报告人: Prof TengFei Luo(University of Notre Dame)
Polymers, usually known as thermal insulators, can have amazing thermal transport properties depending on their morphology. In this talk, we will discuss a series of atomistic simulations of thermal transport in polymers. We will first discuss how polyethylene molecules can be re-formed into highly aligned forest through self-assembling to conduct heat across two solid substrates efficiently. The results show the promise of polyethylene in thermal interface material applications and implies the strategy of reforming polymers into thermal conductors. We will then discuss the results on Polydimethylsiloxane (PDMS) – the most widely used thermal interface polymer. The results suggest a strong correlation between the molecular morphology and thermal transport properties. Lastly, we will discuss our findings on the morphology-thermal conductivity dependency in polyethylene fibers, and show how we can utilize such a correlation to manipulate thermal conductivity through temperature, strain and their combination.
Dr. Luois the director of the Molecular-level Energy and Mass Transport (MEMT) lab in the department of aerospace and mechanical engineering at Notre Dame. His research interests include atomistic simulations and experimental study of nanoscaleheat transfer and molecular level mass transfer. Of special interest to his group are thermal transport across material interfaces, first-principle characterization of phonon transport, and pump-probe measurement of thermal conductivity and interfacial thermal conductance. He is a coworker in a novel water desalination technology called Directional Solvent Extraction. This technology was selected as one of the top ten world-change ideas by Scientific America. His group is combing computation and experiments to optimize the desalination process.