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Make graphene membranes

 

Engineers at the Massachusetts Institute of Technology have shown that the obtained by condensation from the vapor graphene can be used as a chemically selective membrane. The work of scientists published in the journal ACS Nano, and its summary can be found on the website of the institute.

The researchers obtained graphene wafer with condensation of carbon atoms from the vapor. The analysis of the material scientists have found that the resulting graphene has so many defects – pores that pass small molecules. Pore ​​diameter ranged from one to 15 nanometers – enough to pass ions of salts and many organic substances, but too small for typical polymers or viruses.

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The authors draw attention to the fact that the resulting defects can not be lack of production method, and its dignity, thus obtained graphene could be useful in the production of filters. Such use contributes to its very high mechanical strength and impermeability is a record since.

Scientists have created a prototype of the membrane by applying a layer of graphene area of ​​2.5 cm on a polycarbonate substrate, and then measured the permeability of the filter obtained for different substances. According to the developers, the material may be useful in the production of sensors concentration of different substances. It needs to be chemically modified pores, to give them the properties of different chemical selectivity.

Earlier results of the computer simulation showed that the membranes for desalination, made of graphene, are considerably more effective than their conventional counterparts.