Stories tagged MOFs

Mar
15
2009

MOF-74: hydrogen storage tank: MOF-74 resembles a series of tightly packed straws comprised mostly of carbon atoms (white balls) with columns of zinc ions (blue balls) running down the walls. Heavy hydrogen molecules (green balls) adsorbed in MOF-74 pack into the tubes more densely tha
MOF-74: hydrogen storage tank: MOF-74 resembles a series of tightly packed straws comprised mostly of carbon atoms (white balls) with columns of zinc ions (blue balls) running down the walls. Heavy hydrogen molecules (green balls) adsorbed in MOF-74 pack into the tubes more densely thaCourtesy NIST

Chemistry happens where molecules touch

Chemical interactions happen only when molecules "touch". To maximize these interactions simply maximize the surface area of the material.

More than an acre of surface in each gram

Scientists are now creating materials so porous that one gram of material (smaller than a pea) has more surface area than a football field (~4000 sq. meters).

MOF-74 (pictured) can soak up more unpressurized hydrogen than if the hydrogen were compressed into a solid. Until recently the threshold for surface area was 3,000 square meters per gram. Then in 2004, a U-M team reported development of a material known as MOF-177 (metal-organic frameworks) that has the surface area of a football field.

New material breaks surface area record

"Pushing beyond that point has been difficult," Matzger said, but his group achieved the feat with the new material, UMCM-2 (University of Michigan Crystalline Material-2), which has a record-breaking surface area of more than 5,000 square meters per gram. J of Amer Chem

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New Nanoporous Material Has Highest Surface Area Yet
More Solid than Solid: A Potential Hydrogen-Storage Compound

May
20
2007

Nanotech sponges can absorb hydrogen, carbon dioxide, or methane.

COF-108: Credit: José L. Mendoza-Cortés
COF-108: Credit: José L. Mendoza-Cortés
Omar Yaghi was named one of the "Brilliant 10" by Popular Science magazine last fall, describing him as a "hydrogen nano-architect". Like an architect, Yaghi links together well-defined molecules like building blocks to create porous crystalline structures. Referred to as metal-organic frameworks, or MOFs, these crystal sponges have nanosized openings which can be customized to soak up only molecules of a particular size (like hydrogen or methane). MOFs could lead to the first workable fuel tanks for a hydrogen cars, or laptops and cell phones.

New material sets record for most surface area per gram.

Yaghi's newest material, called covalent organic frameworks, or COFs "(pronounced "coffs") are crystalline porous organic networks. A member of this series, COF-108, has the lowest density reported of any crystalline material. One gram of COF-108, has a surface area equal to 30 tennis courts. Yaghi specifically cited COFs as a possible storage medium for carbon dioxide capture and sequestration systems.

Learn more about Omar Yaghis and his research: