Dinesh Ramesh; Giri Prasad.M.J; Abhishek Raaj.A.S; Jerome Santharaj.N; Rishi Kumar.R; Santhip. J; Devashankar. S
Abstract
Engine oil is primarily used to carry away the excess heat from engine and to provide lubrication to moving parts of the engine, thereby reducing friction and wear between the rubbing surfaces. However with time net heat stored in the bulk of the engine oil becomes greater than its thermal conductivity ...
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Engine oil is primarily used to carry away the excess heat from engine and to provide lubrication to moving parts of the engine, thereby reducing friction and wear between the rubbing surfaces. However with time net heat stored in the bulk of the engine oil becomes greater than its thermal conductivity causing a drastic reduction in its viscosity leading to formation of oil sludges inside the engine. Previous studies prove that the nano engine oil prepared by dispersing nanoparticles into engine oil provides enhanced operational characteristics when compared to plain engine oil, but are accompanied by the high cost of preparation and low stability of the nano engine oil[1]. In the present study a nano base oil which is a dispersion of MWCNTs and ZnO nanoparticles of ratio 1:4 in mineral oil was prepared by the two step preparation process. Tribological properties such as wear resistance, friction co-efficient and thermophysical properties such as thermal conductivity, viscosity, flash point of the nano base oil were evaluated and were compared with SAE 20W40 engine oil. The results obtained reveal that nano base oil possess better tribological and thermophysical properties when compared to engine oil, which will eventually improve the lifetime of the engine components. Copyright © 2018 VBRI Press.
Karuna Nalwa; Anupama Thakur; Neeta Sharma
Abstract
In the present study nanoparticles of zinc oxide (ZnO) were synthesized by simple solution based approach and used as an adsorbent for the removal of Cu(II) ions from aqueous solution. ZnO nanoparticles were characterized by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Dynamic ...
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In the present study nanoparticles of zinc oxide (ZnO) were synthesized by simple solution based approach and used as an adsorbent for the removal of Cu(II) ions from aqueous solution. ZnO nanoparticles were characterized by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Dynamic Light Scattering (DLS). TEM confirmed the formation of zinc oxide nanoparticles in the size range of 10-11 nm. Adsorption capacity of ZnO for removing Cu(II) ions from aqueous solutions was investigated at different pH, as a function of contact time, metal ion concentration and the amount of adsorbent. Moreover, adsorption isotherms and kinetics was studied to understand the nature and mechanism of adsorption. A high percentage removal (98.71%) of Cu(II) from its aqueous solutions at pH 5 and at initial heavy metal ion concentration of 300 mg/l by ZnO particles was achieved. The adsorption isotherm was well described by Freundlich isotherm model(R2= 0.999). The adsorption kinetics data was well fitted by the pseudo-second-order rate model with a high regression coefficient. The above results suggest that ZnO nanoparticles can be used as potential adsorbent for the efficient removal of heavy metals from aqueous solutions. Copyright © 2017 VBRI Press
