UConn chemistry professor Doug Adamson has found an inexpensive way to manufacture the pristine form of this substance, which is stronger than steel and thinner than a human hair. Credit: Peter Morenus/UConn Photo
A UConn chemist Professor Doug Adamson has patented a one-of-a-kind process for exfoliating graphene in its pure (unoxidized) form, as well as manufacturing innovative graphene nanocomposites that have potential uses in a variety of applications, including desalination of brackish water. If you think of graphite like a deck of cards, each individual card would be a sheet of graphene. Comprised of a single layer of carbon atoms arranged in a hexagonal lattice, graphene is a 2D crystal at least 100X stronger than steel. Aerogels made from graphene are some of the lightest materials known to man, and the graphene sheets are one of the thinnest, at only 1 atom thick – a million times thinner than a human hair. Graphene is also even more thermally and electrically conductive than copper, with minimal electrical charge.
Graphene has been a hot topic for researchers since it was first isolated from graphite in 2004. Since then, more than 10,000 scholarly articles have been published about the material. But only Adamson’s discusses a proprietary process for manufacturing graphene in its pristine form. What others are calling “graphene” is often actually graphene oxide that has been chemically or thermally reduced. The oxygen in graphene oxide provides a sort of chemical handle that makes the graphene easier to work with, but adding it to pristine graphene reduces the material’s mechanical, thermal, and electrical properties in comparison to unmodified graphene like the kind Adamson produces.
It also significantly increases the cost to manufacture the material. Oxidizing graphite requires adding expensive hazardous chemicals, such as anhydrous sulfuric acid and potassium peroxide, followed by a lengthy series of manipulations to isolate and purify the products, known as a chemistry workup. Adamson’s process doesn’t require any additional steps or chemicals to produce graphene in its pristine form. “The innovation and technology behind our material is our ability to use a thermodynamically driven approach to un-stack graphite into its constituent graphene sheets, and then arrange those sheets into a continuous, electrically conductive, three-dimensional structure” says Adamson. “The simplicity of our approach is in stark contrast to current techniques used to exfoliate graphite that rely on aggressive oxidation or high-energy mixing or sonication – the application of sound energy to separate particles – for extended periods of time. As straightforward as our process is, no one else had reported it. We proved it works.”
A distinctive feature of graphene that seems like an obstacle to many – its insolubility – is at the heart of Adamson’s discovery. Since it doesn’t dissolve in liquids, Adamson and his team place graphite at the interface of water and oil, where the graphene sheets spontaneously spread to cover the interface and lower the energy of the system. The graphene sheets are trapped at the interface as individual, overlapping sheets, and can subsequently be locked in place using a cross-linked polymer or plastic.
While stabilized graphene composite materials have countless potential uses in fields as varied as aircrafts, electronics, and biotechnology, Adamson chose to apply his technology to improving standard methods for the desalination of brackish water. With his SPARK funding, he is developing a device that uses his graphene nanocomposite materials to remove salt from water through a process called capacitive deionization, or CDI.
CDI relies on inexpensive, high surface area, porous electrodes to remove salt from water. There are two cycles in the CDI process: an adsorption phase where the dissolved salt is removed from the water, and a desorption phase where the adsorbed salts are released from the electrodes by either halting or reversing the charge on the electrodes. Many materials have been used to create the electrodes, but none have proven to be a viable material for large-scale commercialization. Adamson and his industry partners believe that his simple, inexpensive, and robust material could be the technology that finally brings CDI to market in a major way.
“The product we are developing will be an inexpensive graphene material, with optimized performance as an electrode, that will be able to displace more expensive, less efficient materials currently used in CDI,” says Michael Reeve, one of Adamson’s partners and a veteran of various successful startups. http://today.uconn.edu/2017/08/synthesizing-pure-graphene-miracle-material/
Recent Comments