Invited SpeakersProfile Details

Prof. Yu Han
Prof. Yu Han KAUST, Saudi Arabia

Biography

Dr. Yu Han is Associate Professor of Chemistry at King Abdullah University of Science and Technology, Saudi Arabia. In 2003-2008, he worked in Institute of Bioengineering and Nanotechnology, Singapore, as a post-doc fellow, research scientist and senior research scientist. He completed Ph.D.in Inorganic Chemistry, Jilin University, in 2003. Dr Han is a materials chemist and his research is focused on nanoporous and nanostructured materials, including ordered mesoporous materials, hierarchically structured zeolites, porous organic polymers, porous carbons, and metallic plasmonic nanocrystals. His ability to precisely control the structure and morphology of these materials promoted his great success in developing novel applications for them in gas adsorption/separation, heterogeneous catalysis, and nanophotonics. Dr. Han also has expertise in electron microscopy and electron tomography, using which he has successfully solved or identified some complex nanostructures. Dr. Han has published > 140 journal articles, and these papers have been cited over 10000 times with h-index of 46.

All sessions by Prof. Yu Han

  • Day 4Thursday, February 23rd
Session 6: Advanced Porous Functional Materials/Modeling III
11:00 am

Porous Materials: Synthesis, Imaging, and Applications

Direct synthesis of hierarchical zeolites currently relies on the use of surfactant-based templates to produce mesoporosity by the random stacking of two-dimensional zeolite sheets or the agglomeration of tiny zeolite grains. In this talk, we will discuss the feasibility and the merits of using non-surfactant polymers as dual-function templates in the fabrication of hierarchical zeolites [1-2]. First, the minimal intermolecular interactions of non-surfactant polymers impose little interference on the crystallization of zeolites, favoring the formation of three-dimensionally continuous zeolite frameworks with a long-range order. Second, the mutual interpenetration of the polymer and the zeolite networks renders disordered but highly interconnected mesopores in zeolite crystals. These two factors allow for the synthesis of single-crystalline, mesoporous zeolites of varied compositions and framework types [1-2]. Third, extra functional groups in the polymer template can be utilized to incorporate desired functionalities into hierarchical zeolites [2]. Last and most importantly, polymer-based templates permit heterogeneous nucleation and growth of mesoporous zeolites on existing surfaces, forming a continuous zeolitic layer [2]. The advantages of hierarchical zeolites over conventional bulk zeolites as catalysts in different reactions will also be discussed. In the second part of this talk, we will introduce our recently developed method that enables the atomic-resolution TEM of MOFs that are extremely electron beam sensitive and therefore conventionally considered unexplorable by TEM. With this method, we successfully imaged a series of MOF materials with atomic resolution for the first time, and investigated their surface and interfacial structures [3].

[1] Zhu, J. et al., “Highly mesoporous single-crystalline zeolite beta synthesized using a non-surfactant cationic polymer as a dual-function template”, Journal of the American Chemical Society 2014, 136, 2503
[2] Tian, Q. et al., “Beyond Creation of Mesoporosity: the Advantages of Polymer-based Dual-function Templates for Fabricating Hierarchical Zeolites”, Adv. Func. Mater. 2016 dx.doi.org/10.1002/adfm.201504888
[3] Zhu, Y. et al., "Unravelling surface and interfacial structures of a metal-organic framework by transmission electron microscopy" Nature Materials 2017, in press

Level 0, between bld. 4 and 5 11:00 - 11:30 Details