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Sangita Kumari,Rashi Gusain,Niranjan Kumar,Om P. Khatri 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-
Lamellar-structured nanomaterials are gaining large interest for tribological applications owing to theirremarkable mechanical and low shearing properties. Herein, polyethylene glycol (PEG)-mediatedhierarchical microspheres of MoS2 nanosheets are synthesized by a facile and single-step hydrothermalreduction of ammonium molybdate in the presence of thiourea. The PEG functions as a soft templatingmaterial and provides hierarchical microspheres of MoS2 nanosheets. Detailed chemical andmicrostructural features of hierarchical microspheres of MoS2 nanosheets are probed by FTIR[14TD$DIF], XPS,Raman, XRD, TGA, FESEM, and HRTEM analyses. Each nanosheet of MoS2 [15TD$DIF]microspheres is composed oflimited number (10–20) of atomic-thick lamellae[3TD$DIF] as deduced from HRTEM images. The MoS2microspheres, as[4TD$DIF] additive[5TD$DIF] provide significantly improved lubrication properties for steel tribo-pair byreducing the friction ( 21%) and the wear (42%) compared to that of fully formulated 10W40 lubricant. The elemental mapping of worn surfaces revealed the deposition of MoS2 nanosheets on the contactinterfaces. The improved lubrication properties are attributed to collective effect of deposition ofdelaminated MoS2 lamellae on the contact interfaces, low shearing and high mechanical strength ofMoS2 nanosheets.
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.