题 目：Precise engineering of fast and selective molecular flow
across atomically thin nanopores and nanochannels
报告人：CHI CHENG, 澳大利亚墨尔本大学ARC Future Fellow
时 间：2023年6月2日 （周五）14：00-15：30
邀请人：李林森 副教授，何雨石 副研究员
成驰，澳大利亚ARC Future Fellow。自2022年5月起担任墨尔本大学化学工程系，纳米流体力学与能源实验室的团队负责人。2017-2020年，在MIT机械工程系从事博士后研究，师从Rohit Karnik 和 Kong Jing教授；2021年提职Research Scientist。2014年博士毕业于Monash大学，师从Dan Li教授。课题组的研究和教学兴趣主要集中在材料科学和传输现象的交叉领域，特别关注分子尺度传输过程在纳米系统中的理解和控制，以应对化学分离、电化学储能和合成中的关键挑战。2017年，荣获Australian Endeavour Research Fellowship；2021年，荣获DOE Geothermal Lithium Extraction Prize 和Australian Research Council Future Fellowship。迄今，已在Science，Nature Nanotechnology（两篇一作），Science Advances，Advanced Materials等重要国际期刊发表学术论文多篇。
Chi (David) Cheng is an Australian Future Fellow in chemical engineering at the University of Melbourne where he is the group leader for the nanofluidics and energy laboratory since May 2022. Prior to his current position, he was a postdoctoral scholar followed by a research scientist appointment in mechanical engineering at the Massachusetts Institute of Technology from 2017 to 2022. Chi received his Ph.D. in materials science and engineering from Monash University in 2014. He joined the R&D division of DuluxGroup Australia working on emulsion synthesis and product design from 2016 to 2017. His research and teaching interests lie at the intersection of materials science and transport phenomena, with a particular focus on understanding and controlling molecular-scale transport processes in nanosystems critical for addressing key challenges in chemical separations, electrochemical energy storage and synthesis. Chi has garnered several recognitions for his research contributions, including the Australian Endeavour Research Fellowship in 2017, being named a semifinalist for DOE Geothermal Lithium Extraction Prize in 2021, and being awarded the Australian Research Council Future Fellowship in 2021.
Achieving net zero global transition requires the chemical industry to decarbonize, which in turn demands fundamental innovations in the engineering of momentum, mass, charge, and energy transfer with unparalleled efficiency and precision at the molecular level. Among many emerging clean technologies, precise control of ionic and molecular transport is oftentimes the limiting steps, preventing optimal performance in for example, membrane separations, batteries, and catalysts. However, due to the presence of competing forces, intricate structural and chemical interactions in nanosystems, unpredictable transport behaviors emerge, posing significant challenges in engineering nanofluids with molecular-level accuracy.
In this talk, I discuss advances in our understanding of precise engineering of nanofluids by: (i) proposing a pathway for scalable fabrication of angstrom size-tunable atomically thin nanopores and nanochannels, (ii) developing combined experiment and theoretical approaches to study novel transport physics under nanoconfinement, and (iii) exploring fast and selective molecular transport as a function of structural and chemical interactions. I first discuss our attempts in exploring liquid permeation through atomically thin nanopores, which are sub-continuum and molecular geometry-dependent when pore size approaches the liquid’s smallest molecular cross-section. Then, I venture into the space between two layers of carbon atoms where I present the discovery of the correlated ion transport in nanoconfined electrical double layer, which can be fast and reversibly modulated with the surface potential. I conclude the talk by illustrating how engineering nanofluids can translate into new engineering solutions to address challenges in sustainable energy and manufacturing, specifically in chemical separations and electrochemical technologies.