Nav: Home

Super-adsorbent MOF captures twice its weight in water

January 11, 2018

Material chemists in the Kingdom of Saudi Arabia have developed a superporous solid made up of a patchwork of metal ions and organic linkers (a metal-organic framework, or MOF) that can suck up to 200% of its own weight in atmospheric moisture. The technology, presented January 11 in the journal Chem, could be applied to regulating humidity levels, particularly in confined environments such as aircraft cabins and air-conditioned buildings.

"I am not surprised that MOFs surpass existing solids in their water capacity uptake," says senior author Mohamed Eddaoudi, of the King Abdullah University of Science and Technology. "MOFs' modularity, ultra-high surface areas, and large pore volumes, combined with the ability to control the pore surface functionality and pore size and shape, place MOFs as prospective candidates for energy-efficient and cost-effective humidity-control systems."

Permanently porous superabsorbent materials, with the combined requisite hydrolytic stability and significant water uptake, are challenging to make because most porous solids are either too dense or too reactive to water. Eddaoudi and his collaborators overcame this problem with their design of Cr-soc-MOF-1, a MOF made up of chromium ions linked together by carboxylate-based organic ligands that leave well-defined cages and channels for water to collect. The chromium ions are held in place by carboxylate moieties in a bidentate fashion, forming a rigid hexacarboxylate oxo-trinuclear chromium(III) cluster, ensureing that the resultant Cr-soc-MOF-1 adsorbent possess the required hydrolytic stability.

The researchers tested Cr-soc-MOF-1's water adsorption properties and found that as the relative humidity increases up to 55%, the adsorbed amount of water gradually increases, followed by a steep water uptake between 60 and 75% relative humidity. As this point, the MOF reaches its maximum capacity, where it can capture nearly twice its weight in adsorbed water (1.95 g/g). Markedly, Cr-soc-MOF-1 maintains its structural integrity and performance over more than 100 tested water vapor adsorption-desorption cycles.

Now that the researchers have a material that can readily regulate humidity (absorbs and desorbs), they are engaged in collaborative work to develop ways to create a humidity-control device.

"In 20 years we went from a folklore that MOFs are not stable and are just pretty structures to MOFs with unprecedented hydrolytic stability and exceptional properties relevant to energy security and environmental sustainability," Eddaoudi says. "There is no doubt in my mind that the future of MOFs is bright, and the only limitation will be the scientist's imagination on where MOFs can be deployed effectively and efficiently."
-end-
The research was fully supported by the King Abdullah University of Science and Technology.

Chem, Abtab et al.: "Reticular Chemistry in Action: A Hydrolytically Stable MOF Capturing Twice Its Weight in Adsorbed Water" http://www.cell.com/chem/fulltext/S2451-9294(17)30473-4

Chem (@Chem_CP) is the first physical science journal published by Cell Press. The sister journal to Cell, Chem, which is published monthly, provides a home for seminal and insightful research and showcases how fundamental studies in chemistry and its sub-disciplines may help in finding potential solutions to the global challenges of tomorrow. Visit http://www.cell.com/chem. To receive Cell Press media alerts, contact press@cell.com

Cell Press

Related Technology Articles:

How technology use affects at-risk adolescents
More use of technology led to increases in attention, behavior and self-regulation problems over time for adolescents already at risk for mental health issues, a new study from Duke University finds.
Hold-up in ventures for technology transfer
The transfer of technology brings ideas closer to commercialization. The transformation happens in several steps, such as invention, innovation, building prototypes, production, market introduction, market expansion, after sales services.
The ultimate green technology
Imagine patterning and visualizing silicon at the atomic level, something which, if done successfully, will revolutionize the quantum and classical computing industry.
New technology detects COPD in minutes
Pioneering research by Professor Paul Lewis of Swansea University's Medical School into one of the most common lung diseases in the UK, Chronic Obstructive Pulmonary Disease, has led to the development of a new technology that can quickly and easily diagnose and monitor the condition.
New technology for powder metallurgy
Tecnalia leads EFFIPRO (Energy EFFIcient PROcess of Engineering Materials) project, which shows a new manufacturing process using powder metallurgy.
More Technology News and Technology Current Events

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Teaching For Better Humans
More than test scores or good grades — what do kids need to prepare them for the future? This hour, guest host Manoush Zomorodi and TED speakers explore how to help children grow into better humans, in and out of the classroom. Guests include educators Olympia Della Flora and Liz Kleinrock, psychologist Thomas Curran, and writer Jacqueline Woodson.
Now Playing: Science for the People

#535 Superior
Apologies for the delay getting this week's episode out! A technical glitch slowed us down, but all is once again well. This week, we look at the often troubling intertwining of science and race: its long history, its ability to persist even during periods of disrepute, and the current forms it takes as it resurfaces, leveraging the internet and nationalism to buoy itself. We speak with Angela Saini, independent journalist and author of the new book "Superior: The Return of Race Science", about where race science went and how it's coming back.