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SUMMARY:Amphipathic Nature of Graphene Flakes - Karolina Milowska
DTSTART:20201118T113000Z
DTEND:20201118T123000Z
UID:TALK153223@talks.cam.ac.uk
CONTACT:Angela Harper
DESCRIPTION:Graphene\, due to its extraordinary electronic\, thermal and m
 echanical\nproperties\, holds great promise for applications ranging from\
 noptoelectronic\, through environmental to biomedical technologies.\nHowev
 er\, for many potential large scale processing routes to efficiently\nmanu
 facture and commercialize graphene based devices\, composites\,\ncoatings\
 , membranes or inks it is essential to understand the\nfundamental colloid
 al properties of pristine graphene flakes. Despite\nsignificant progress i
 n the field in recent years\, their chemical\ncharacter has remained incom
 pletely understood and there has been no\nconsensus whether pristine graph
 ene flakes are typical hydrophobes or\ncould\, under certain conditions\, 
 become wettable.\n\nWe have reinvestigated this question with precise expe
 riments and\nrigorous quantum-mechanical\, molecular dynamics and Monte Ca
 rlo studies.\nFor the first time\, calculations supported by experiments h
 ave revealed\nthat pristine graphene flakes are 2D amphiphiles with well d
 efined\nhydrophilic edges and hydrophobic basal plane surfaces the interpl
 ay of\nwhich allows small flakes to be utilised as surfactants. Our findin
 gs\nreconcile all previous results on the chemical nature of graphene\nfla
 kes. The interactions between flakes can be  controlled by varying\nthe fl
 ake size\, its thickness and the oil-to-water ratio. Pristine\ngraphene fl
 akes can stabilize water/oil emulsions even under high\npressure\, high te
 mperature and in saline solutions\, conditions under\nwhich conventional s
 urfactants fail.\n\nJoin Zoom Meeting:\n* https://bham-ac-uk.zoom.us/j/857
 02415099?pwd=VTh5aFZ4Sm9Nc1dxZXYwelJpc1JtZz09\n* Meeting ID: 857 0241 5099
 \n* Passcode: 501623
LOCATION:Zoom
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