Development new method generate test metal-organic frameworks

Development of new method to generate and test metal-organic frameworks

3:08 AM, 9th December 2011
Development of new method to generate and test metal-organic frameworks
Hundreds of thousands of hypothetical materials, 15 of which are pictured above, are simultaneously investigated for their ability to store natural gas. Each small orange ball represents a molecule of methane, the primary component of natural gas.

EVANSTON, US: Porous crystals called metal-organic frameworks, with their nanoscopic pores and incredibly high surface areas are excellent materials for natural gas storage with millions of different structures possible.

A Northwestern University research team has developed a computational method with new algorithm that automatically generates and tests hypothetical metal-organic frameworks (MOFs), rapidly zeroing in on the most promising structures. These MOFs then can be synthesized and tested in the lab.

Using their method, the researchers quickly identified more than 300 different MOFs that are predicted to be better than any known material for methane (natural gas) storage. The researchers then synthesized one of the promising materials and found it beat the U.S. Department of Energy (DOE) natural gas storage target by 10 percent.

There already are 13 million vehicles on the road worldwide today that run on natural gas this number is expected to increase sharply due to recent discoveries of natural gas reserves. 

In addition to gas storage and vehicles that burn cleaner fuel, MOFs may lead to better drug-delivery, chemical sensors, carbon capture materials and catalysts. MOF candidates for these applications could be analyzed efficiently using the Northwestern method.

“When our understanding of materials synthesis approaches the point where we are able to make almost any material, the question arises as Which materials should we synthesize?” said Randall Q. Snurr, professor of chemical and biological engineering, the McCormick School of Engineering and Applied Science. Snurr led the research. “This paper presents a powerful method for answering this question for metal-organic frameworks, a new class of highly versatile materials.”

Christopher E. Wilmer, a graduate student in Snurr’s lab, developed the new algorithm; Omar K. Farha, research associate professor of chemistry, Weinberg College of Arts and Sciences,  and   Joseph T. Hupp, professor of chemistry, led the synthesis efforts. 

“Currently, researchers choose to create new materials based on their imagining how the atomic structures might look,” Wilmer said. “The algorithm greatly accelerates this process by carrying out such ‘thought experiments’ on supercomputers.”

The researchers were able to determine which of the millions of possible MOFs from a given library of 102 chemical building block components were the most promising candidates for natural-gas storage. In just 72 hours, the researchers generated more than 137,000 hypothetical MOF structures. This number is much larger than the total number of MOFs reported to date by all researchers combined (approximately 10,000 MOFs). The Northwestern team then winnowed that number down to the 300 most promising candidates for high-pressure, room-temperature methane storage.

In synthesizing the natural-gas storage MOF that beat the DOE storage target by 10 percent, the research team showed experimentally that the material’s actual performance agreed with the predicted properties. 

The new algorithm combines the chemical “intuition” that chemists use to imagine novel MOFs with sophisticated molecular simulations to evaluate MOFs for their efficacy in different applications. The algorithm could help remove the bottleneck in the discovery process, the researchers said.



© Northwestern University News



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