Faculty Publications

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    Eclipta prostrata leaf aqueous extract mediated synthesis of titanium dioxide nanoparticles
    (2012) Govindasamy, G.; Rahuman, A.A.; Priyamvada, B.; Khanna, V.G.; Devarepally, D.K.; Jose, P.J.
    Eco-friendly, nontoxic, inexpensive, abundantly available hitherto unreported Eclipta prostrata leaf extract is used for the biosynthesis of titanium dioxide nanoparticles (TiO 2 NPs). The TiO 2 NPs were characterized by FTIR, XRD, AFM and FESEM analysis. FTIR peak implicated the role of carboxyl group OH stretching amine NH stretch in the formation of TiO 2 NPs. XRD characterized in crystallographic plane of rutile phase. AFM showed uneven surface morphology which indicates the presence of both individual and agglomerated nanoparticles. FESEM analysis showed shape in spherical clusters, quite polydisperse and it ranges in size from 36 to 68 nm with calculated average size of 49.5 nm. In this paper, we have demonstrated a novel biological route for the synthesis of TiO 2 NPs. © 2011 Elsevier B.V. All rights reserved.
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    Investigation on wear behavior of aluminium matrix micro and nanocomposites
    (Elsevier Ltd, 2022) Kumar, S.; Kumar, A.; Poddar, A.; Asthana, P.
    Aluminum matrix composites (AMCs) have a wide range of applications in aerospace, marine, and automobile because of their improved tribological and mechanical properties. In the present article, Al7075 alloy was used as the matrix material filled with micro (average size 50 μm) and nano (average size 80 nm) particles of Al2O3 (alumina). The same quantity of weight fractions of micro and nano alumina particles were injected into the semi-solid state of Al7075 aluminum alloy by the mechanical stir casting process. The developed composites have been investigated for specific wear rate (SWR) by using Pin on Disc Tribometer. The results of nano and micro composites have been compared at similar combinations of input parameters. The normal load, sliding distance, and sliding velocity were the input parameter for analyzing the SWR. The result shows that SWR increased with an increase in normal load and sliding distance. It has been found from the results that SWR is inversely proportional to sliding velocity. Also, results indicate that SWR of the developed AMCs containing nano alumina was found superior to that of the micro composite and base material. © 2021