Army

Enhanced Stability of Metal-Organic Frameworks using Plasma Enhanced Chemical Vapor Deposition

Metal organic frameworks are a leading class of porous materials for a wide variety of applications, such as gas storage, separations, catalysis, and even toxic gas removal. However, many MOFs that are highly active towards toxic chemicals are prone to decomposition due to moisture. Many efforts have focused on developing MOFs that are air-stable and water-stable so they can survive harsh field environments.

Materials

The US Army Edgewood Chemical Biological Center has developed and patented a process for post-treating MOFs with fluorocarbons using plasma-enhanced chemical vapor deposition (PECVD). Fluorinations of the organic linkers, in conjunction with a hydrophobic coating, prevent water clustering. In particular, fluorinated precursors develop reactive radicals in the plasma and form a variety of fluorine and carbon-fluorine functional groups that react with the surface, drastically changing the properties of the MOF substrate. The resulting material is also less hydrophilic and allows for its use in ambient applications where moisture is omnipresent.

MOFs targeted reactions against toxic chemicals make it beneficial for integration into filtration devices

MOFs targeted reactions against toxic chemicals make it beneficial for integration into filtration devices

This US patent 9,216,404 is related to US patent 8,883,676.

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