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Research Seminar of Prof. Gu Cheng from South China University of Technology

Research Seminar of Prof. Gu Cheng from South China University of Technology

 

Lecture Time:  10:00 on 24th April, 2019

Lecture Room: C501 of Science and Innovation Building

Lecture Title: Design of porous materials with local flexibility


Abstract

Design of the gas-diffusion process in a porous material is challenging because a contracted pore aperture is a prerequisite, while the channel traffic of guest molecules is regulated by the flexible and dynamic motions of nanochannels.[1-3]Herein, we present rational design of a diffusion-regulatory system in a porous coordination polymer (PCP) in which flip–flop molecular motions within the framework structure provide kinetic gate functions enabling efficient gas separation and storage.[4]The PCP shows significant temperature-responsive adsorption in which the adsorbate molecules are differentiated by each gate-admission temperature, facilitating kinetics-based gas separations of oxygen/argon and ethylene/ethane with high selectivities of ~350 and ~75, respectively. Additionally, we demonstrate the long-lasting physical encapsulation of ethylene at ambient conditions, owing to strongly impeded diffusion in distinctive nanochannels.

Figure 1  Schematic representation of diffusion-regulatory pore systems.


1. “Controlling guest conformation for efficient purification of 1,3-butadiene” P.-Q.Liao, N.-Y. Huang, W.-X. Zhang, J.-P. Zhang, X.-M. Chen,Science2017,356, 1193–1196.

2. “A mesh-adjustable molecular sieve for general use in gas separation” S. Ma, D. Sun, X.-S. Wang, H.-C. Zhou,Angew. Chem. Int. Ed.2007,46, 2458–2462.

3. “Arigid nested metal–organic framework featuring a thermoresponsive gating effect dominated by counterions” Q. Gao, J. Xu, D. Cao, Z. Chang, X.-H. Bu,Angew. Chem. Int. Ed.2016,55, 15027–15030.

4. “Design and control of gas diffusion process in a nanoporous soft crystal” C. Gu, N. Hosono, J.-J. Zheng, Y. Sato, S. Kusaka, S. Sakaki, S. Kitagawa,Science2019,363, 387–391.

 

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