Scientists have a gas capture frame for nanocatalysts with power power



Feb 08, 2019

(TheNanowerk News) When a physician and engineer Rice, Hossein Robatjazi, married a dragon sieve called MOF to a nanoparticle aluminum plasmonic two years ago, it was never thought that the key was a & # 39; A process that used nature for petrify wood.

In a new newspaper in the magazine Advanced knowledge ("Metal-organic frames that attract nanocrystal alloy buildings"), Robatjazi and co-authors with Laboratory Rice for Nanophotonics (LANP) Describes how the pseudomorphic center is the only chemical process that causes a tree to stone, and Help you to expand to & # 39; first metal-organic frame (MOF) around nanocatalyst powerful aluminum. metal-organic framework Graphic to show the synthesis method that is; Start with aluminum nanocrystals covered with an oxygen (left left) and its; finishing with nanocrystal covered in a metal-organic frame (MOF). The MOF self-assemblage around a grain when the oxygen will; largely distributed to aluminum inks connected to an organic connection to create a 3D framework. (Image with permission from LANP / Rice University) (Image: LANP / Rice University) (click on image to enlarge)

Catalysts are aids that promote chemical reactions without working alone, and are used to do a & # 39; Most chemicals made commercially. Given that most businesses work at high temperatures or high or both, they also have a " come with great power. The variety of MOFs and plasmonic aluminum can create a new way for greener bottle design that will be used; use the energy of the sun and make them from the most common metal in the Earth crabs.

In the study, Robatjazi, Director of LANP Naomi Halas and co-workers confirmed the principle of a process called the migration of gas-gas at environmental temperatures and stress under the terms of laboratory that represented sunlight . The rehabilitation of carbon dioxide (CO2) transformation and hydrogen gas into one-oxygen carbon – a storage resource for chemicals – and water.

"This is the first example that shows you can combine MOF granules and aluminum to make this revival light," said the reviewer, a LANP graduating student, Robatjazi Rice who has started plasmonic technologies for applications so different to diagnosis and cancer treatment, MRI interfaces and solar water clips.

Plasmons are wavelengths that overlay the surface of small metal nanoparticles, various shape and size of nanoparticle plasmonic, LANP scientists can connect it to and extract energy from light. In a previous investigation, a copper nanocatalyst LANP revealed that hydrogen was cleaned from ammonia, and antenna-reactors based on aluminum for ethylene, the most common plastic of polyethylene, the most common plastic in the world.

Halas said the latest work with MOF is important for a number of reasons.

"We have confirmed that the MOF that grows around the nanocrystals alochanes contributes to the photocatalytic work of the aluminum aluminum and also gives us a new way of doing; control the size, and thus the plasmonic features, of the crannogs themselves, "said Halas. "Finally, we have shown that the basic collaborative approach is working for different types of MOF."

It is three-dimensional structures in a MOF that; Collect itself when metal strands interact with organic molecules called a connection. The structures are very nice, such as sponge or cheese of Swiss. Only a range of MOF surfaces is larger than a football area, and by changing the type of metal, the connections and the answering reasons, MOF chemists can be designed by different structures, pounds sizes and actions , how to capture special molecules. Over 20,000 types of MOF were made.

In Robatjazi's first experiments, he attempted to develop MIL-53, a well-researched MOF diagnosed for its CO2 capture capability. He tried parallel lines that worked for MOF to grow around gold fragments, failed for aluminum, and was accused of suspicion of oxid oxide in Robatjazi.

Unlike gold, aluminum is highly reactive with oxygen, and all nanoparticle aluminum is covered with a tana of aluminum oxide at 2- to 4 levels at the time it comes into communication with the air.

"It's unhappy," said Robatjazi. "It is not like a flat surface with crystals well-defined. It's like a winding road, and the MOF crystals can not structure that surface."

In view of the chemical literature, Robatjazi was hoping to reinstate pseudomorphic mineral work both. Prepare the surface of the fragments to take MOF and take the metal blocks for MOF.

"We learned from Mother Nature, and we use the same strategy especially because it's a mineral aluminum oxide," he said. "Usually for MOF, we will combine a metal device with an organic connection, and in this case we eliminated the metal compartment and instead replaced the aluminum oxide and we used aluminum ion from that response as metal components of the MOF. "

By changing the response conditions, Robatjazi detected that he could control the surface of the surface, so that he could not. controlling the final size – and plasmonic features – of the inner plasmic crannogs. For MIL-53, the CO2-the MOF, showed that the plasmic cellular activity of nanocrystal aluminum plasmonic activity increased when the MOF was a place.

Finally, he proved that he could use the same artificial way with different connections, and # 39; making MOF with different breeds and other buildings, including a variety of hydrophilic types; keeping water away from the aluminum ground.

"We are investigating ways to convert the features of aluminum-MOF structures, either by parallel or post-synthesis change," said Halas. "This flexibility could open a range of opportunities to spread plasmon intermediaries that are relatively expensive for business and better for the environment."


Source link