Trane Technologies launches graphene-enhanced air purification system for public buses

Trane Technologies’ Thermo King brand has launched a new graphene-based air purification solution for buses that continuously purifies the air while the bus is in operation.

Thermo King says its Air Purification Solution has been independently tested and proven to be 98 percent effective in deactivating certain viruses, including a surrogate for the virus that causes COVID-19.

EPFL scientists develop highly efficient graphene-based carbon dioxide filter

Scientists at EPFL have developed an energy-efficient graphene-based carbon dioxide filter that can extract carbon dioxide out of a gas mix, to then be either stored or converted into useful chemicals.

Professor Kumar Varoon Agrawal at EPFL's School of Basic Sciences (EPFL Valais Wallis) has led a team of chemical engineers to develop the world's thinnest filter from graphene. "Our approach was simple," says Agrawal. "We made carbon dioxide-sized holes in graphene, which allowed carbon dioxide to flow through while blocking other gases such as nitrogen, which are larger than carbon dioxide." The result is a record-high carbon dioxide-capture performance.

Researchers develop method to control graphene nanochannel orientation and dimensions for improved membranes and filters

A team of Brown University researchers has found a way to orient the gaps that form between sheets of graphene that are stacked on top of each other. The tiny gaps, called nanochannels, are positioned by the team in a way that makes them more useful for filtering water and other liquids of nanoscale contaminants.

Structure and fabrication steps leading to vertically aligned Zr-GO/epoxy membranes imageStructure and fabrication steps leading to vertically aligned Zr-GO/epoxy membranes. Image from article

“In the last decade, a whole field has sprung up to study these spaces that form between 2D nanomaterials,” said Robert Hurt, a professor in Brown’s School of Engineering and coauthor of the research. “You can grow things in there, you can store things in there, and there’s this emerging field of nanofluidics where you’re using those channels to filter out some molecules while letting others go through.”

Researchers shed light on ionic interactions with graphene and water

Researchers led by Northwestern University engineers and Argonne National Laboratory scientists have reached new findings regarding the role of ionic interaction within graphene and water. Their insights could open the door to the design of new energy-efficient electrodes for batteries or provide the backbone ionic materials for neuromorphic computing applications.

"Every time you have interactions with ions in matter, the medium is very important. Water plays a vital role in mediating interactions between ions, molecules, and interfaces, which lead to a variety of natural and technological processes," said Monica Olvera de La Cruz, Lawyer Taylor Professor of Materials Science and Engineering, who led the research. "Yet, there is much we don't understand about how water-mediated interactions are influenced by nanoconfinement at the nanoscale."

Researchers develop enhanced graphene sieve that could advance clean water efforts

Vanderbilt engineers recently designed a simple defect-sealing technique to correct variations in pore size in graphene membranes. The researchers reported a breakthrough in scalable fabrication of graphene membranes with a sealing technology that corrects variations in the pore size so they remain small enough to trap salt ions and small molecules but allow water to pass.

Vanderbilt engineers design a defect-sealing technique to correct variations in pore size in graphene membranes image

One of the most complex engineering challenges when making membranes so thin is to maintain integrity in the uniformity of the pores, which requires drilling atomically precise holes in a one-atom thick sheet of carbon atoms. “A single large hole can cause high leakage and compromise membrane performance,” said Piran Kidambi, assistant professor of chemical and biomolecular engineering.