Science, Space and Technology News 2024
Gas separation is crucial across many industries but often involves energy-intensive processes, such as cooling gases to liquefy and then separate them based on their evaporation temperatures. However, Professor Wei Zhang and his team at the University of Colorado Boulder have developed a new type of porous material that is flexible, sustainable, and energy-efficient.
Separating gases, however, can be both energy-intensive and expensive. “For example, when separating oxygen and nitrogen, you need to cool the air to very low temperatures until they liquefy. Then, by slowly increasing the temperature, the gases will evaporate at different points, allowing one to become a gas again and separate out,” explains Wei Zhang, aMuch gas separation relies on porous materials through which gases pass and are separated.
For several years, Zhang and his research group worked to develop a porous material that introduces an element of flexibility to a linking node in an otherwise rigid porous material. That flexibility allows the molecular linkers to oscillate, or move back and forth at a regular speed, changing the accessible pore size in the material and allowing it to be adapted to multiple gases.
The researchers used a fairly new type of dynamic covalent chemistry that focuses on the boron-oxygen bond. Using a boronwith four oxygen atoms around it, they took advantage of the reversibility of the bond between the boron and oxygen, which can break and reform again and again, thus enabling self-correcting, error-proof behavior and leading to the formation of structurally ordered frameworks.
Zhang adds that he and his co-researchers considered scalability in developing this material, since its potential industrial uses would require large amounts, “and we believe this method is highly scalable. The building blocks are commercially available and not expensive, so it could be adopted by industry when the time is right.”
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