Effect of pore occupancy on the acoustic properties of Zeolitic Imidazolate Framework (ZIF)-8: A Brillouin spectroscopic study at ambient and low temperatures

Radhakrishnan, Dhanya ; Narayana, Chandrabhas (2015) Effect of pore occupancy on the acoustic properties of Zeolitic Imidazolate Framework (ZIF)-8: A Brillouin spectroscopic study at ambient and low temperatures The Journal of Chemical Physics, 143 (23). Article ID 234703. ISSN 0021-9606

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Official URL: https://aip.scitation.org/doi/abs/10.1063/1.493776...

Related URL: http://dx.doi.org/10.1063/1.4937763

Abstract

Brillouin spectroscopy is used to study the effect of pore occupancy on the elastic constants by incorporating various guest molecules into Zeolitic Imidazolate Framework (ZIF)-8. A systematic study on the effect of mass and polarizability of the guest has been carried out by incorporating alcohols of varying chain lengths at room temperature. The interaction between the guest and host affects the elastic properties, lifetimes and guest dynamics inside the pores. The elastic anisotropy was seen to reduce upon incorporation of the guests. We have also studied the temperature dependence of the acoustic modes on gas adsorption to understand the framework flexibility. The Brillouin shift of the acoustic modes increases upon temperature dependent gas adsorption with transverse acoustic modes exhibiting a larger shift. This suggests a hardening of otherwise low shear modulus of ZIF-8. Our findings give insight into the role of guest molecules and temperature in tuning the elastic properties of ZIF-8 which is important for practical applications.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
ID Code:113716
Deposited On:23 Apr 2018 12:08
Last Modified:23 Apr 2018 12:08

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