Ion Permeability in Graphene

 


Wurzburg scientists have published new findings in the journal Nature. The team has controlled the passage of halide ions through graphene by introducing defects into a two layer system. 

The study will advance water purification techniques in the future. 

The next research steps will focus on controlling the permeability of graphene for different substances. Frank Wurthner is from the Julius-Maximillian’s Universitat Wurzberg in Bavaria, Germany. 

He explains, “ so-called defects can be created in the carbon lattice of Graphene. These can be thought of as small holes that makes the lattice permeable to  the gases.”

The team hasn’t worked with other ions like fluoride, chloride or bromide yet.  Wurthner responds, “. . .this would be a fundamental scientific interest for applications such as the desalination of water, the detection or purification of mixtures of substances. The defects in graphene are known to allow the passage of ions.”

For the first time, Frank Wurthner and his team have created a novel system that uses defects to allow the halides, Fluoride, chloride and bromide to pass through, but not iodine. A stable double layer of graphene encloses a cavity. The halide ions are bounded in this cavity. Chloride is found in seawater and plays an important role in all life functions.

Dr. Kazutaka Shoyama led the project with Frank Wurthner. He reports, “ The high permeability for chloride by nano graphene and a selective binding of a double layer nano graphene brings some applications closer.” 

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