|
|
| Type |
Oral Presentation |
| Area |
Oral Presentation for Young Physical Chemists I |
| Room No. |
Room 305+306 |
| Time |
THU 09:40-09:49 |
| Code |
PHYS1.O-5 |
| Subject |
Understanding gas behavior in local pores of Metal-Organic Frameworks by gas adsorption crystallography |
| Authors |
Hae Sung Cho, Osamu Terasaki*
School of Physical Science and Technology, ShanghaiTech University, China
|
| Abstract |
Gas adsorption is an essential and reliable characterization method for porous materials. Recently, we showed that in-situ X-ray scattering profiles along the complete pore filling led to the discovery of extra-adsorption domain and superlattice formation in mesoporous metal-organic frameworks (MOFs) with single pore type [1]. This method, termed here generally as “gas adsorption crystallography”, allowed for the access to knowledge such as the subtle changes in lattice constant, strain of the framework, quantitative and spatial distribution of gases, reflecting the gas behavior at any stage in the isotherm.
Here, we demonstrate an extension of gas adsorption crystallography to porous crystals containing multiple types of pore and show how gas adsorption isotherms can be accurately decomposed into multiple sub-isotherms corresponding to each type of pore within a material. Specifically, two MOFs, PCN-224 and ZIF-412 containing two and three different types of pore, respectively, are used to generate isotherms of individual pores by combining gas adsorption measurements with in-situ X-ray diffraction. This isotherm decomposition approach reveals previously inaccessible information concerning gas uptake capacity, surface area, accessible pore volume of each individual pore, as well as the impact of pore geometry on the uptake and distribution of different adsorbates within the pores.
[1] Cho, H. S. et al. Nature 527, 503 (2015).
|
| E-mail |
jhs83914@gmail.com |
|
123rd General Meeting of the KCS