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Nanofluid lubrication and high pressure Raman studies of oxygen functionalized graphene nanosheets
Karuna Kara Mishra,Kalpataru Panda,Niranjan Kumar,Deepika Malpani,T.R. Ravindran,Om P. Khatri 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-
Ultralow friction coefficient in reduced graphene oxide (rGO) nanofluid was observed at high pressure lubrication conditions. High pressure Raman spectroscopic studies of graphene oxide (GO) and rGO in a hydrostatic pressure medium in diamond anvil cell (DAC) showed an increase in G-band linewidth in GO but this value was decreased in rGO at same pressure range due to the defect relaxation in sp2 networks. Moreover, loss of recovery of G band linewidth in decompression cycles was clearly noticed in both the samples but it was significantly higher in GO due to the irreversible sp3 into sp2 planar phase.