Browsing by Author "Saratha, R"

Now showing 1 - 20 of 81
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    Biogenic silver nanoparticles – Synthesis, characterization and its potential against cancer inducing bacteria
    (2016) Saratha, R
    Biogenic synthesis of silver nanoparticleswas achieved using extracts fromsixteen commonly available plants by sonication method. The formation of AgNPs was confirmed by UV–Visible spectral, XRD and TEM analyses. The results of TEManalysis reveal mostly spherical-shaped AgNPs of size 5–25 nmAgNPs. Antibacterial assay carried out for the biosynthesized AgNPs against bacteria (Escherichia coli, Salmonella paratyphi, Staphylococcus aureus and Bacillus subtilis) disclosed excellent antibacterial activity. Thismay be due to the small-sized nature of particles diffusing through the agar resulting in good antimicrobial activity.
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    Comparison of Corrosion Mitigation Efficiency of Seed Coat of Coffea Arabica for Mild Steel In 1 M Hcl and 0 .5 M H2So4
    (2010) Saratha, R; Shyamala, R; Thilagavathy, P
    The protection efficiency of seed coat of Coffea Arabica fruit extract on the corrosion of mild steel in 1 M HCI and 0.5 M H2SO4 were evaluated by using Gravimetric method. The study was carried out by varying the parameters like inhibitor concentration, immersion period and temperature. The maximum efficiency was obtained at 2.5 %(v/v) concentration of the inhibitor in both 1 M HCI and 0.5 M HzS04. The protective action of the acid extract was maximum at 12 h in both 1M HCI and 0.5 M H2SO4. In the temperature study the maximum efficiency was obtained at 333 K in 1M HCI and at 323 K in 0.5 M H2SO4.
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    Compatibility of Metals in Jatropha Oil
    (2011) Saratha, R
    Environmental factors and depleting reserves of crude oil are becoming the main driving forces in the quest for cleaner and alternate fuels. A large variety of biofuels are available but very little is known about the corrosion mechanism related to them. The introduction of biofuels is associatod w th difficulties in transport ?nd storage as well as their use. Construction materials for tankers, storage tanks and pipes normally consist of metals, which are prone to corrosion. Hence the present study is on the corrosion aspect of jatropha oil on various metals like carbon steel, aluminum, copper and brass.
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    Corrosion Inhibition and Adsorption Properties of African marigold for the Corrosion of Mild Steel in Hydrochloric acid
    (2012) Saratha, R
    Inhibitive and adsorption properties of acid extract of flowers of African marigold (AMF) for the corrosion of mild steel in hydrochloric acid medium was studied using weight loss and electrochemical studies. The results revealed that acid extract of African marigold flowers inhibited the corrosion of mild steel. The inhibition efficiency of the extract increases with increase in concentration of the extract, exposure time and temperature of the medium. The maximum inhibition efficiency of 97% was obtained at 0.3%v/v concentration of the extract at room temperature. Potentiodynamic polarization study clearly reveals that the extract controls both anodic as well as cathodic reactions. Double layer capacitance (Cdl) and charge transfer resistance (Ret) values were derived from Nyquist plots. The adsorption of extract components on the mild steel surface was found to follow the Langmuir adsorption isotherm. The energy of activation, enthalpy of activation and entropy of activation for the dissolution process were determined and discussed. A mechanism of adsorption of the flower components on the surface of the metal was proposed for the inhibition behavior on the basis of FTIR study.
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    Corrosion Inhibition and Adsorption Properties of African marigold for the Corrosion of Mild Steel in Hydrochloric acid
    (2012) Saratha, R
    Inhibitive and adsorption properties of acid extract of flowers of African marigold (AMF) for the corrosion of mild steel in hydrochloric acid medium was studied using weight loss and electrochemical studies. The results revealed that acid extract of African marigold flowers inhibited the corrosion of mild steel. The inhibition efficiency of the extract increases with increase in concentration of the extract, exposure time and temperature of the medium. The maximum inhibition efficiency of 97% was obtained at 0.3%v/v concentration of the extract at room temperature. Potentiodynamic polarization study clearly reveals that the extract controls both anodic as well as cathodic reactions. Double layer capacitance (Cdl) and charge transfer resistance (Rct) values were derived from Nyquist plots. The adsorption of extract components on the mild steel surface was found to follow the Langmuir adsorption isotherm. The energy of activation, enthalpy of activation and entropy of activation for the dissolution process were determined and discussed. A mechanism of adsorption of the flower components on the surface of the metal was proposed for the inhibition behavior on the basis of FTIR study.
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    CORRosion Inhibition Of Mild Steel In Acid Medium Using Canna Indica As Green Corrosion Inhibitor
    (2016) Saratha, R
    The corrosion inhibition of mild steel in 1M HCl by Canna Indica flower extract (CIFE) has been studied by mass loss method and electrochemical techniques (potentiodynamic polarization and electrochemical impedance spectroscopy). The results showed that increase in concentration of CIFE decreases the rate of mild steel dissolution which indicates the inhibitive behaviour of CIFE in acid medium. Electrochemical impedance spectroscopy (EIS) results showed that corrosion inhibition of mild steel occurred mainly by charge transfer process. The potentiodynamic polarization results revealed that the acid extracts of CIFE act as mixed type inhibitor. SEM studies provide strong evidence for the protection of mild steel surface by CIFE inhibitor.
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    Corrosion Inhibition of Mildsteel in Acid Medium by Hexadecyl Amine
    (1999-05) Mangayarkarasi, S; Saratha, R
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    Corrosion inhibitor-A plant extract
    (2010) Saratha, R
    The efficacy of an acid extract of leaves of Sida rhombifolia.L as corrosion inhibitor for mild steel in IM phosphoric acid medium, was earned out using weight loss measurements, polarization and electrochemical impedance spectral studies. Experiments are performed by varjang iimnersion period, concentration of the inhibitor and temperature. The results showed variation in inhibition performance of the inhibitor with varying concentration, immersion time and temperature. The maximum efficiency was found to be 97.48% at 1 %( w/v) concentration of the inhibitor for the immersion period of 24 hours. Langmuir and Temkin were tested to describe the adsorption behavior of inhibitor on the mild steel surface. Potentiodynamic polarization study clearly revealed that inhibitor acts as a mixed type of inhibitor. The results of the electrochemical impedance study showed a decrease in double layer capacitance as the adsorption of inhibitor caused structural change at electrode-solution interface.
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    Corrosion Mitigation of low Carbon Steel in Hydrochloric acid Medium by Tagetes erecta Stem Extract
    (2016) Subha, R; Saratha, R
    The corrosion inhibitive effect o f Tagetes erecta stem (TES) extract on the corrosion of mild steel in hydrochloric acid medium was studied using chemical and electrochemical studies. The maximum inhibition efficiency of 97% was obtained at 0.3%V/V concentration of the extract at room temperature. Potentiodynamic polarization study reveals that the extract controls both anodic as well as cathodic reactions. Double layer capacitance (Cdi) and charge transfer resistance (Ret) values were derived from Nyquist plots. A mechanism of adsorption of the stem components on the surface o f the metal was proposed for the inhibition behavior on the basis ofFTIR study.
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    Corrosion Mitigation of low Carbon Steel in Hydrochloric acid Medium by Tagetes erecta Stem Extract
    (2016) Saratha, R
    The corrosion inhibitive effect o f Tagetes erecta stem (TES) extract on the corrosion of mild steel in hydrochloric acid medium was studied using chemical and electrochemical studies. The maximum inhibition efficiency of 97% was obtained at 0.3%V/V concentration of the extract at room temperature. Potentiodynamic polarization study reveals that the extract controls both anodic as well as cathodic reactions. Double layer capacitance (Cdi) and charge transfer resistance (Ret) values were derived from Nyquist plots. A mechanism of adsorption of the stem components on the surface o f the metal was proposed for the inhibition behavior on the basis ofFTIR study.
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    Corrosion of Metals in biodiesel from Pongamia Pinnata
    (2010) Saratha, R
    Biodiesel is a suitable renewable alternative fuel that can be added to diesel derived from fossil fuel because their constituents match that of diesel. Tankers, storage tanks, pipes and pumping equipment are normally constructed using carbon steel, stainless steel or aluminium. It is known that biodiesel and biodiesel blends form sediments when in contact with metals. Natural or nitrile rubber compounds, polyethylene, polypropylene, and polyvinyl materials are also vulnerable to biodiesel. A review of literature on biofuels reveals that least work has been carried out on the corrosion of metals in biodiesel. This paper presents corrosion rates of aluminum, copper, brass and carbon steel in biodiesel obtained from Pongamia Pinnata.
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    Corrosion of Metals in Biofuels
    (2010) Saratha, R
    Global amiual production of bioethanol exceeds 36,500 million liters and tliat of biodiesel exceeds 3,524 million liters. Dining production, transportation and usage, biofiiels come in contact witli vaiious materials (metals and non-metals). Therefore it is important to imderstand tlie influence of biofiiels on materials as well as tlie influence of materials on biofiiels, Tliis paper summarizes our cuixent understanding of tlie coirosion of metals in biofiiels. Tlie sources of biofiiels have been renewed. Difterent t>"pes of coirosion expenenced in biofiiels liave been discussed, Teclmiques to investigate tlie conosivit>' of biofiiels have been analyzed. Future developments in tliis field have been liiglihghted,