Molecular rivets keep porous COFs from collapsing in humid air, benefiting water harvesting, dehumidification, heat pumps


"mesoporous keto-enamine-linked COFs show enhanced framework physical stability due to intralayer hydrogen bonds... COFs adsorb/ release water vapor, capillary forces exerted within shift layers, collapse channels, transform frameworks into amorphous polymers...trade-off: smaller pores more stable, hold less water/ larger pores stored more water, collapse under capillary forces... overcome using keto-enamine linkages creating intralayer hydrogen bonds holding layers rigidly together, preventing interlayer slipping"

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https://www.eurekalert.org/news-releases/1106285

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