F-KCW-Department Publications
Permanent URI for this communityhttps://dspace.psgrkcw.com/handle/123456789/1
Browse
57 results
Search Results
Item THE INHIBITION EFFECT OF THIAZINE COMPOUNDS TOWARDS THE CORROSION OF MILD STEEL IN SULPHURIC ACID MEDIA(Rasayan Journal of Chemistry, 2012-12) Hemapriya V; Parameswari K; Bharathy GThe inhibition effect of thiazines (AT, CBT & NBT) on mild steel corrosion in 1M sulphuric acid (H2SO4) was investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The result showed that corrosion rate was significantly decreased in presence of the inhibitors. The inhibiting action increases with the concentration of thiazine compounds to attain 99 % at 0.5mM of (AT). The increase in temperature leads to a decrease in the inhibition efficiency of the compounds in the temperature range 308-353K. Adsorption of thiazines on the mild steel surface in 1M H2SO4 obeyed the Langmuir adsorption isotherm. EIS measurements showed an increase in charge transfer resistance (Rct) with concentration. Potentiodynamic polarization study showed that the inhibitors act as mixed type, controlling both the anodic and cathodic reactions. Surface analysis by SEM confirmed the formation of adsorbed protective layer of the inhibitor on the steel surface.Item INHIBITING EFFECTS OF BENZOTHIAZOLE AMINE SCHIFF BASES ON THE CORROSION OF MILD STEEL IN ACID ENVIRONMENT(International Journal of Recent Scientific Research, 2014-08) Hemapriya V; Parameswari K; Chitra SThe corrosion inhibition of mild steel in 1M H2SO4 solution by Benzothiazol-2-yl- benzylidene amine (BBA) & 2-(Benzothiazol-2-yliminomethyl)-phenol (BIP) has been studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy. The experimental results showed that the inhibition efficiency increases with increasing inhibitor concentration but decreases with increasing temperature. The adsorption of inhibitors on the mild steel surface obeyed the Langmuir adsorption isotherm. Potentiodynamic polarization curves revealed that the compounds act as mixed type inhibitors. The impedance measurements showed a change in the charge transfer resistance and double layer capacitance indicating adsorption of inhibitors on the mild steel surface. Surface analysis of mild steel has been carried out using scanning electron microscopy (SEM) with EDX and Fourier transform infrared (FT-IR) spectroscopy. Quantumchemical calculations have been performed and several quantum chemical indices were calculated in order to complement the experimental resultsItem UTILIZATION OF BIOWASTE AS AN ECO-FRIENDLY BIODEGRADABLE CORROSION INHIBITOR FOR MILD STEEL IN 1 MOL/L HCL SOLUTION(Science Direct, 2020-12) Venkatesan, Hemapriya; Mayakrishnan, Prabakaran; Subramanian, Chitra; Manoharan, Swathika; Seung-Hyun, Kim; Ill-Min, ChungThis report focuses on the application of a biodegradable biowaste [human hair-(HHR)], to produce a mild steel corrosion inhibitor. The performance of HHR extract in inhibiting metallic corrosion in 1 mol/L HCl was investigated. The analysis of the metal corrosion behavior using electrochemical and weight loss techniques revealed that HHR exhibits an efficient corrosion-mitigating effect via adsorption on the metal surface following a Langmuir isotherm. Tafel-plot results revealed the mixed-mode corrosion protection behavior of HHR. Surface analysis using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), and Fourier transform infrared (FT-IR) spectroscopy provided evidence for the precipitation of a protective HHR film on the metal surface.Item ASSESSMENT OF LOW CARBON STEEL CORROSION INHIBITION BY ECO-FRIENDLY GREEN CHAENOMELES SINENSIS EXTRACT IN ACID MEDIUM(The Korean Electrochemical Society, 2018-05-06) Ill-Min, Chung; Venkatesan, Hemapriya; Kanchana, Ponnusamy; Natarajan, Arunadevi; Subramanian, Chitra; Chi-Hee, Youn; Seung-Hyun, Kim; Mayakrishnan, PrabakaranThe impact of methanol extract of Chaenomeles sinensis (C. sinensis) leaves on acid corrosion of low carbon steel was assessed by gravimetric and electrochemical methods. Phytochemical characterization by total phenolic content (TPC), and total flavonoids content (TFC) of the extract was performed. The TPC and TFC concentrations were identified as 193.50 and 40.55 mg/g. Efficiency increased remarkably in the presence of inhibitor and found as concentration dependent. A maximum inhibition efficiency of 93.19% was achieved using 2000 ppm of the C. sinensis inhibitor. Impedance and surface morphology analysis by SEM and AFM revealed that the anticorrosive activity results from the protective film of phytochemical components of C. sinensis extract adsorbed on the metal surface.Item PREPARATION OF MESOSCOPIC STRUCTURE POLY METHYL METHACRYLATE THIN FILMS FOR AFM DATA STORAGE DEVICES.(2015) B, Chandar Shekar; S, Sathish; Sulana, Sundari; S., Sunnitha; C, SharmilaPoly methyl methacrylate (PMMA) thin films were prepared by dip coating method. Benzene was used as a solvent to prepare PMMA thin films for the time periods ranging from 1 min. to 1 h. The thickness of the films deposited was measured by using an electronic thickness measuring instrument (Tesatronic-TTD-20). Fourier Transform Infrared spectrum was used to identify the above said films. X-ray diffraction spectra indicated the predominantly amorphous nature of the films. Surface morphology of the coated films studied by using scanning electron microscope (SEM) indicated the absence of any pits, cracks and pin holes in the surface. Both as grown and annealed films showed smooth and amorphous structures. The closer SEM inspection revealed the presence of self assembled mesoscopic cells. The mesoscopic structure PMMA thin films could be used as an AFM-based data storage which is promising alternative to conventional magnetic data storage because it offers great potential for considerable storage density improvements.Item NEW TRANSITION METAL (II) COMPLEXES WITH NAPHTHOATE AND AMINOGUANIDINE-BASED LIGANDS: A COMBINED SPECTROSCOPIC AND THEORETICAL STUDY WITH ITS APPLICATIONS(Taylor & Francis, 2022-08-18) Ponnusamy, Kanchana; Natarajan, Aruna Devi; Balakrishnan, Prabha Devi; Sankaran, Shanmuga Sundari; Venkatesan, Hemapriya; Ill-Min, Chung; Mayakrishnan, PrabakaranA new series of transition metal complexes of Mn(ΙΙ), Fe(ΙΙ), Co(ΙΙ) and Ni(ΙΙ) is synthesized from aminoguanidine and 3-hydroxy-2-naphthoic acid ligands with the formula (N4H7C)2[M{(C10H6(O)(COO)}2]·2H2O. The synthesized complexes were characterized by analytical, spectral and thermal studies. The elemental analysis confirms the composition of the complexes. The XRD studies show that all the complexes are isostructural in nature. The complexes were screened for antimicrobial activity against a Gram-positive, Bacillus subtilis (B. subtilis), and a Gram-negative, Escherichia coli (E. coli), bacterial species. The antibacterial results were concurrent with the output of the DFT investigation of metal complex, showing that the aminoguanidine moiety plays a key role in biological activity. Molecular docking studies have been carried out to identify the binding affinity and the mode of interaction of metal complexes with E. coli protein (2FUM). Further the synthesized complex is used as a single source precursor for preparation of nano metal oxides. The photocatalytic activity was carried out using the metal oxide as catalyst for degradation of dye materials. The metal oxide is found to be an efficient catalyst for degradation of methyl orange dye.Item CARICA PAPAYA PEEL MEDIATED SYNTHESIS OF SILVER NANOPARTICLES AND ITS ANTIBACTERIAL ACTIVITY AGAINST HUMAN PATHOGENS(Elsevier, 2017-10-01) Balavijayalakshmi J; Ramalakshmi VMetallic nanoparticles are traditionally synthesized by wet chemical techniques, in which the chemicals used are quite often toxic and flammable. Ripe carica papaya peel is found to be a suitable source for green synthesis of silver nanoparticles. In the present work, a cost effective and environmental friendly technique for the green synthesis of silver nanoparticles from 1 mM silver nitrate (AgNO3) solution through the extract of ripe Carica papaya peel of various concentrations (5 ml, 10 ml, 15 ml, 20 ml, 25 ml) is described. The synthesized silver nanoparticles are characterized by using the UV–vis absorption spectroscopy, FT-IR, XRD, SEM and TEM. The formation of silver nanoparticles is confirmed by surface plasmon resonance, determined by UV–vis spectra at 400–435 nm. The shift in the absorption bands and variation in the calculated optical band gaps for the various concentrations of papaya peels extracts are also observed. The FT-IR spectra reveal that an increase in the concentration of the papaya peel extract shifts the bands to higher wavelengths. The average crystallite size for various concentrations of papaya peel extract is observed from XRD spectral analysis and is found to be around 16–20 nm, which is in good agreement with the TEM analysis. The SEM analysis shows the spherical structure of the silver nanoparticles with some agglomeration for higher concentrations of papaya peel extract. The synthesized silver nanoparticles show good antibacterial activity against human pathogens such as Escherichia coli and Staphylococcus aureus and it has many medical applicationsItem IMPACT OF IRON DOPING ON STRUCTURAL AND OPTICAL PROPERTIES OF NICKEL SULPHIDE NANOPARTICLES(Elsevier, 2022-01-01) Balavijayalakshmi J; Sonia DTransition metal sulphides exhibit excellent optical, photo electrical and thermoelectric properties. These materials have attracted much attention because of its applications in the field of electroluminescence devices, light emitting displays, cathode material for rechargeable lithium battery, magnetic devices, dye degradation and optical sensors. In the present work, iron doped Nickel sulphide nanoparticles are synthesized using chemical precipitation method. Nickel chloride and Ferric chloride are used as precursors and sodium sulphide as a stabilizing agent. The performance of the synthesized nanoparticles are analysed by varying the molarity of the iron chloride from 0.01 M to 0.05 M. The synthesized nanoparticles are characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Ultraviolet Visible spectroscopy (UV–Vis) and Photoluminescence (PL) studies. FT-IR spectral analysis shows the band at 630 cm−1 corresponds to the bending vibration of metal sulphur bond (Ni-S) and the bands observed around 585 cm−1 and 456 cm−1 are ascribed to Fe–O stretching vibrations of tetrahedral and octahedral lattice sites respectively. The XRD analysis shows the crystalline nature of nanoparticles and the average nano-crystallite size is found to be 18 nm − 26 nm. The crystallite size increases with increase in the concentration of iron. The morphology of the samples is analyzed using scanning electron microscope and is found to be spherical in shape. The optical properties are characterized using UV–Vis spectral analysis and PL study. UV–Visible absorption spectra show absorption peaks of iron doped nickel sulphide nanoparticles and the band exhibits a blue shift, indicates quantum size effect. Electrochemical studies revealed two oxidation peaks at a potential about −0.3 V and 0.7 V for pure nickel sulphide nanoparticles and in addition to it, a redox peak is observed at a potential about −0.5 V due to the doping of iron into the nickel sulphide nanoparticles. The synthesized nanoparticles may be used as high-performance electrode materials for supercapacitor applications.Item LIRIOPEPLATYPHYLLA EXTRACT AS A GREEN INHIBITOR FOR MILD STEEL CORROSION IN SULFURIC ACID MEDIUM(Taylor & Francis, 2019-11-23) Ill-Min Chung; Venkatesan Hemapriya; Seung-Hyun Kim; Kanchana Ponnusamy; Natarajan Arunadevi; Subramanian Chitra; Mayakrishnan Prabakaran; Mayakrishnan GopiramanThe phytochemical components of the methanol extract of Liriopeplatyphylla (L. platyphylla) leaves were identified using UHPLC, and their antioxidant activities were studied. The impact of the L. platyphylla extract on the corrosion of mild steel by 1 M H2SO4 was assessed using electrochemical and gravimetric techniques. L. platyphylla exhibited concentration-dependent corrosion protection activity through a mixed-mode adsorption process, as revealed by polarization studies. Impedance measurements indicated the development of a protective film of the inhibitor, which was confirmed by morphology studies at the micro level with scanning electron microscopy (SEM) and at the nano level with atomic force microscopy (AFM). Fourier transform infrared (FT-IR) studies also confirmed the adsorption of the inhibitor film onto the mild steel surface.Item CHARACTERISATION OF POLYANILINE COPPER COMPOSITES PREPARED VIA IN-SITU MECHANICAL MIXING, MICROWAVE ASSISTED AND INTERFACIAL METHOD OF POLYMERISATION(PSGR Krishnammal College for Women, 2018-09-06) S, Yuvasree; R, Viveka; SowmyaRamkumarThe present study deals with green synthesis of copper nanoparticles by using leaf extract of AzadirachtaIndica. It acts as reducing as well as capping agent for the nanoparticles. PAni –Cu (polyaniline copper) composite was then prepared by in-situ mechanical, microwave and interfacial methods of polymerization using Cu nanoparticles as addition agent. The obtained polymers were then characterized by UV - Visible, FT - IR, XRD and SEM. The effect of copper on the structure and property of polyaniline was studied showing an excellent in its property compared to the polymer.