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.
New milestone in printed photovoltaic technology
A team of researchers at Friedrich-Alexander-Universit├Ąt have achieved an important milestone in the quest to develop efficient solar technology as an alternative to fossil fuels.
Gene Drive Technology: Where is the future?
For this episode of BioScience Talks, we're joined by Gene Drive Committee co-chair James P.
Could Hollywood technology help your health?
The same technology used by the entertainment industry to animate characters such as Gollum in 'The Lord of The Rings' films, will be used to help train elite athletes, for medical diagnosis and even to help improve prosthetic limb development, in a new research center at the University of Bath launched today.
Assessing carbon capture technology
Carbon capture and storage could be used to mitigate greenhouse gas emissions and thus ameliorate their impact on climate change.
New technology for dynamic projection mapping
It has been thought technically difficult to achieve projection mapping onto a moving/rotating object so that images look as though they are fixed to the object.

Related Technology Reading:

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

Don't Fear Math
Why do many of us hate, even fear math? Why are we convinced we're bad at it? This hour, TED speakers explore the myths we tell ourselves and how changing our approach can unlock the beauty of math. Guests include budgeting specialist Phylecia Jones, mathematician and educator Dan Finkel, math teacher Eddie Woo, educator Masha Gershman, and radio personality and eternal math nerd Adam Spencer.
Now Playing: Science for the People

#517 Life in Plastic, Not Fantastic
Our modern lives run on plastic. It's in the computers and phones we use. It's in our clothing, it wraps our food. It surrounds us every day, and when we throw it out, it's devastating for the environment. This week we air a live show we recorded at the 2019 Advancement of Science meeting in Washington, D.C., where Bethany Brookshire sat down with three plastics researchers - Christina Simkanin, Chelsea Rochman, and Jennifer Provencher - and a live audience to discuss plastics in our oceans. Where they are, where they are going, and what they carry with them. Related links:...