Scientists from Rice University and the University of Maryland lead efforts to overcome a major barrier. Despite being recognized as some of the strongest substances on Earth, utilizing their full potential has proven to be a difficult task. 2D materials, which are finer than even the thinnest o
have found a way to overcome this barrier, by carefully tweaking the molecular structure of 2D polymers known as covalent organic frameworks . The findings are detailed in a new study published in“It’s a very exciting starting point,” said Rice University materials science and nanoengineering professor Jun Lou, who led the Rice team.
The first COF, like most 2D materials, showed only a weak interaction among layers, and both strength and elasticity drained away as more layers were added. Not so with the second COF, which “exhibits strong interlayer interaction and retains its good mechanical properties even as multiple layers are added,” said Rice University doctoral student Qiyi Fang, a co-lead author of the PNAS paper.
The potential applications are many. “COFs could make excellent filtration membranes,” said Rice’s Lou. “For a filtration system, the functional group structure at the pore will be very important. As you have, say, dirty water traveling through a COF membrane, the functional group at the pore will capture the impurities only and allow the desired molecule to pass. In this process, the mechanical integrity of that membrane will be very important.
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