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Prabakaran, Mayakrishnan,Kim, Seung-Hyun,Sasireka, Asokan,Kalaiselvi, Kathirvel,Chung, Ill-Min VNU Science Press 2018 Journal of Adhesion Science and Technology Vol. No.
<P>The corrosion of aluminum specimens in Polygonatum odaratum (P. odaratum) extract was studied using weight loss measurements, potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy (SEM), and electron dispersive X-ray spectroscopy (EDX) techniques. The inhibition efficiency of the aluminum specimens in the presence of inhibitor from P. odaratum plant extract at 303-333 +/- 1 K was evaluated with the weight loss technique. The results indicate the inhibition efficiency of P. odaratum plant extract increased with increased concentration of the inhibitor and decreased temperature in an acidic medium. The corrosion inhibition properties of the P. odaratum plant extract for aluminum specimen corrosion in 1 M HCl were analyzed using polarization studies and electrochemical impedance studies, which clearly showed a mixed-type inhibitor. UV-visible spectroscopy, Fourier transform infrared (FT-IR), SEM, and EDX revealed the surface morphology in the presence and absence of inhibitor on the metal surface. The results indicated the feasibility of using the P. odaratum plant extract as a corrosion inhibitor in acid environments.</P>
Prabakaran, M.,Kim, S.H.,Hemapriya, V.,Chung, I.M. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.37 No.-
<P>The total phenolic and flavonoid compounds present in Cryptostegia grandiflora leaf extract were analyzed. The results confirmed that the extract contains the Myricetin 3582.22(mu g/g) and Rutin 45.62(mu g/g) as major components. C. grandiflora extract was evaluated for its anti-corrosion property on mild steel in 1 M H2SO4. A maximum inhibition efficiency of 87.54% was achieved by using 500 ppm of the inhibitor. Polarization studies indicate that the extract acts as a mixed inhibitor. The formation of productive layer on mild steel by inhibitor was confirmed by SEM-EDS and AFM. The extract is adsorbed on the mild steel according to Temkin adsorption isotherm. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Prabakaran S,Mohanraj T 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
In this study, Al 2 O 3 nanoparticles were included in the Azolla pinnata methyl ester blend (AME30) in different concentrations (25 ppm, 50 ppm and 75 ppm) to analyze the effects on single-cylinder diesel engine. Box-Behnken design (BBD) based on RSM was used for production process optimization. The maximum biodiesel yield of 90.77 % attained at methanol-oil molar ratio (20:1), catalyst (3 wt%) and temperature (75 ˚C). The experiments were performed in a 3.75 kW Kirloskar diesel engine at a constant speed of 1500 rpm with Al 2 O 3 dosed biodiesel blends (AME30+Al25, AME30+Al50 and AME30+Al75), and outcomes were compared with pure diesel and AME30 blend. The corresponding test fuel properties were examined with ASTM standards. As a result, the AME30+Al50 test fuel has improved BTE and reduced BSEC compared to other test fuels. Subsequently, the highest reduction of HC (24.4 %), CO (21.24 %) and smoke opacity (15.25 %) was observed for AME30+Al50 at full load condition compared to diesel results.
<i>Aster koraiensis</i> as nontoxic corrosion inhibitor for mild steel in sulfuric acid
Prabakaran, Mayakrishnan,Kim, Seung-Hyun,Mugila, Nithiyanandham,Hemapriya, Venkatesan,Parameswari, Kandasamy,Chitra, Subramanian,Chung, Ill-Min Elsevier 2017 Journal of industrial and engineering chemistry Vol.52 No.-
<P><B>Abstract</B></P> <P>Inhibition efficiency of <I>Aster koraiensis</I> leaf extract toward corrosion of mild steel in 1M H<SUB>2</SUB>SO<SUB>4</SUB> solution was investigated using weight loss, electrochemical, FT-IR, SEM, and EDX methods The individual phenolic compounds present in <I>A. koraiensis</I> extract were identified. Maximum efficiency of 90.53% was achieved at 2000ppm of the extract. The corrosion kinetic parameters determined from the polarization curves indicated that the extract acted as a mixed-type inhibitor. Adsorption of the inhibitor on the mild steel surface obeyed the Langmuir isotherm. SEM investigations confirmed the formation of inhibition layer unto the metal surface by compounds present in the extract.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>Aster koraiensis</I> extract is a very eco-friendly corrosion inhibitor for mild steel. </LI> <LI> Adsorption of inhibitor by mild steel in 1M H<SUB>2</SUB>SO<SUB>4</SUB> obeys Langmuir isotherm model. </LI> <LI> SEM and EDX examination confirm adsorption of inhibitor unto metal surface. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Prabakaran, Mayakrishnan,Kim, Seung-Hyun,Hemapriya, Venkatesan,Chung, Ill-Min Springer-Verlag 2016 Research on chemical intermediates Vol.42 No.4
<P>A Tragia plukenetii (T. plukenetii) plant extract for use as a low-cost and efficient corrosion inhibitor for mild steel (MS) in 1 M HCl medium has been studied using various methods involving weight loss calculation, electrochemical impedance spectroscopy, and Tafel polarization. The maximum corrosion inhibition efficiency was found to be 88 % at 500 ppm. It was found that the T. plukenetii extract's inhibition efficiency increased with the inhibitor concentration. The polarization measurement showed that the T. plukenetii plant extract acts as good mixed-type inhibitor. Thermodynamic investigations showed the change in enthalpy, entropy, and free energy. The adsorption mechanism of the extract was investigated using UV-Visible, FT-IR, Raman spectroscopy, and wide-angle X-ray diffraction studies. The inhibitor solution, investigated on the basis of the atomic absorption spectra for MS, revealed decreased dissolution of Fe in the presence of the plant extract. Surface analysis of the metal with and without the plant extract was carried out by using scanning electron microscopy and energy-dispersive X-ray spectroscopy.</P>