National Synchrotron Light Source Lunch Time Seminar

"The "Soda-stone" Alchemists: Re-defining Zeolite Natrolite at PTX Space"

Presented by Yongjae Lee, Department of Earth System Sciences, Yonsei University, Korea

Friday, February 17, 2012, 12:00 pm — Seminar Room, Bldg. 725

While an ever-expanding variety of zeolites with a wide range of framework topology is available, it is desirable to have a way to tailor the chemistry of the zeolitic nanopores for a given framework topology via controlling both the coordination-inclusion chemistry and framework distortion/relaxation. This is, however, subjected to the ability of a zeolitic nanopore to allow the redistribution of cations-water assembly and/or insertion of foreign molecules into the pores and channels. Small-pore zeolites such as natrolite (Na16Al16Si24O80x16H2O), however, have been known to show very limited capacity for any changes in the confinement chemistry. We have recently shown that various cation-exchanged natrolites can be prepared under modest conditions from natural sodium natrolite and exhibit cation-radius/temperature-dependent volume expansions/contractions by up to 18.8% via converting the channel ellipticity. Here, we show that pressure can be used as a unique and clean tool to further manipulate the chemistry and geometry of the natrolite nanopores. Our recent crystallographic and spectroscopic studies of pressure-insertion of foreign molecules, trivalent-cation exchange under pressure, and pressure-induced inversion of cation-water coordination and channel geometry in various cation-exchanged natrolites will be presented.

This work was supported by Global Research Laboratory Program of the Korean Ministry of Education, Science, and Technology.

Hosted by: Lin Yang

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