Flexible molecular structures allow large molecules to enter tiny pores
In short: Researchers using a combination of experiments and molecular simulations found that the ZIF-8 framework is much more flexible than previously thought. While the material has very narrow windows, the study observed that the imidazolate linkers can swing open, allowing larger molecules to pass through the structure.
This discovery helps explain why large molecules unexpectedly adsorb into ZIF-8. By observing how the structure changes during gas uptake and at extreme pressures of 14,700 bar, the researchers demonstrated a mechanism for opening the framework's pores. However, the study relies on both experimental techniques and simulations to reach these conclusions.
Why it matters: Understanding how these molecular gates swing open can help design better membranes for separating gases.
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Sources
- Source: Research: Fairenjimenez et al. (2011). Opening the Gate: Framework Flexibility in ZIF-8 Explored by Experiments and Simulations. Journal of the American Chemical Society. · other-oa
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