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futurity_sci_tech 00878.txt

#At super high temps, white graphene stops rust Atomically thin sheets of hexagonal boron nitride (h-BN) have the handy benefit of protecting what's underneath from oxidizing even at very high temperatures researchers have discovered. One or several layers of the material sometimes called hite graphenekeep materials from oxidizing ##or rusting##at temperatures up to 1100 degrees Celsius (2012 degrees Fahrenheit). Researchers say it can be made large enough for industrial applications. Oxidation prevention is already big business but no products available now work on such a grand scale. With the new findings researchers see potential for very large sheets of h-BN only a few atoms thick made by scalable vapor deposition methods. e think this opens up new opportunities for two-dimensional materialsays Jun Lou an associate professor of mechanical engineering and materials science at Rice university. verybody has been talking about these materials for electronic or photonic devices but if this can be realized on a large scale it'#going to cover a broad spectrum of applications. ltrathin h-BN protection might find a place in turbines jet engines oil exploration and underwater or in other harsh environments where minimal size and weight would be an advantage. Wear and abrasion could become an issue the researcher say and optimum thicknesses need to be worked out for specific applications. It's effectively invisible as well which may make it useful for protecting solar cells from the elements Lou says. ssentially this can be a very useful structural material coating . or the study published in Nature Communications researchers made small sheets of h-BN via chemical vapor deposition (CVD) a process they say should be scalable for industrial production. They first grew the thin material on nickel foil and found it withstood high temperature in an oxygen-rich environment. They also grew h-BN on graphene and found they could transfer sheets of h-BN to copper and steel with similar results. hat's amazing is that these layers are ultra thin and they stand up to such ultrahigh temperaturessays Pulickel Ajayan professor of mechanical engineering and materials science and of chemistry. t a few nanometers wide they'##re a totally noninvasive coating. They take almost no space at all. ther researchers from Rice university the University of Texas at Austin Oak ridge National Laboratory and the National University of Singapore contributed to the study which was supported by Army Research Office the Office of Naval Research the Welch Foundation the Korean Institute of Machinery and Materials the National Science Foundation Oak ridge National Laboratory and the Department of energy. Source:

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