NSLS-II Seminar

"Crystal growth and ion exchange in environmentally important materials¬Ě"

Presented by Aaron Celestian

Wednesday, July 22, 2009, 2:00 pm — NSLS-II Seminar Room, Bldg. 817

Materials capable of selectively sieving cations from aqueous media are extremely useful for environmental applications like remediation. The molecular processes leading to ion selectivity in zeolites and other porous materials under extreme environmental conditions are not well understood. This is in part due to the fast rates of exchange reactions and the experimental difficulty probing crystal structures under adverse conditions. By understanding the mechanisms that govern crystal growth and ion selectivity in zeolitic materials, we can learn how to optimize ion exchange for specific environmental conditions.

I will present time-resolved X-ray diffraction studies demonstrating how structural transformations that occur during ion exchange serve to enhance the exchange capacity and/or ion selectivity . I will also describe current work on in situ crystal growth and decomposition in highly acidic and basic solutions. The primary goal of this research is to understand the mechanistic and dynamic nature of cation diffusion and crystallization processes for materials in harsh environments.

Hosted by: Eric Dooryhee

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