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Author: search.filters.author.Ill-Min, Chung

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    NEW TRANSITION METAL(II) COMPLEXES WITH NAPHTHOATE AND AMINOGUANIDINE-BASED LIGANDS: A COMBINED SPECTROSCOPIC AND THEORETICAL STUDY WITH ITS APPLICATIONS
    (Taylor & Francis Online, 2022-10-07) Ponnusamy, Kanchana; Natarajan, Arunadevi; Balakrishnan, Prabha Devi; Sankaran, Shanmuga Sundari; Venkatesan, Hemapriya; Ill-Min, Chung
    A 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.
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    PHYTOFABRICATION OF SILVER NANOPARTICLES FROM LIMONIA ACIDISSIMA LEAF EXTRACT AND THEIR ANTIMICROBIAL, ANTIOXIDANT AND ITS ANTICANCER PROPHECY
    (Elsevier, 2022-10) Ponnusamy, Kanchana; Venkatesan, Hemapriya; Natarajan, Arunadevi; Sankaran, Shanmuga Sundari; Ill-Min, Chung; Mayakrishnan, Prabakaran
    Green synthesis of nanoparticles by eco-friendly methods is a recent technique which draws the attention of researchers because of the reward over many conventional chemical methods. The present work focuses on aqueous Limonia acidissima leaf extract in synthesizing silver nanoparticles and its applications in a simple way. The silver nanoparticles formed were characterized by Infrared, Ultra violet-visible, X-ray diffraction, transmission electron microscopic, and atomic force microscopic techniques. The powder X-ray diffraction studies and transmission electron microscopic images reveal that the silver nanoparticles synthesized were approximately 10–40 nm and have a spherical structure. The nanoparticles were assayed for their antibacterial, antifungal and antioxidant activity. The antimicrobial studies for the silver nanoparticles show a maximum zone of inhibition of 8.8 mm for Bacillus subtilis bacteria and 8.5 mm for Candida albicans fungi at 3 and 1 μg/mL respectively. In-silico ADMET studies reveal that the toxicity, bioactivity, pharmacokinetics and drug-likeness properties of Limonia acidissima leaf extract is good. The molecular docking studies show that the microbial activity is high for Bacillus subtilis and Candida albicans showing the coincidence of the in silico and in vitro studies as expected. The free radical scavenging activity of nanoparticles is 80 for 100 μg/mL. The 50% of inhibition of silver nanoparticles against human breast cancer cell lines is 18 μg/mL. It is evident that silver nanoparticles would be helpful in treating cancer cell lines and have great perspectives in the biomedical sector.
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    LIRIOPE PLATYPHYLLA EXTRACT AS A GREEN INHIBITOR FOR MILD STEEL CORROSION IN SULFURIC ACID MEDIUM
    (Taylor & Francis Online, 2021) Ill-Min, Chung; Venkatesan, Hemapriya; Seung-Hyun, Kim; Kanchana, Ponnusamy; Natarajan, Arunadevi; Subramanian, Chitra
    The phytochemical components of the methanol extract of Liriope platyphylla (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.
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    INHIBITORY EFFECT OF BIOWASTE ON COPPER CORROSION IN 1 M HCL SOLUTION
    (Elsevier, 2021-05) Venkatesan, Hemapriya; Ill-Min, Chung; Seung-Hyun, Kim; Mayakrishnan, Prabakaran
    The potential of human hair extract (HRE), a biodegradable biowaste extract, to protect copper surface and inhibit metallic corrosion in 1 M HCl was investigated using electrochemical and weight loss techniques. The results revealed that HRE exhibits an efficient corrosion-mitigating effect via adsorption onto the metal surface following a Langmuir isotherm. A maximum inhibition efficiency (IE %) of 92.47 % was achieved using 100 ppm of the HRE inhibitor. Tafel plot results revealed the mixed-mode corrosion protection behavior of HRE. Surface analysis using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM) provided evidence for the precipitation of a protective HRE film on the metal surface. The interaction of HRE with copper was investigated using Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) spectroscopy; they confirmed the above conclusions.
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    TRANSITION METAL COMPLEXES OF NOVEL BINUCLEAR SCHIFF BASE DERIVED FROM 3,3′-DIAMINOBENZIDINE: SYNTHESIS, CHARACTERIZATION, THERMAL BEHAVIOR, DFT, ANTIMICROBIAL AND MOLECULAR DOCKING STUDIES
    (Taylor & Francis Online, 2020-03-21) Venkittapuram, Palaniswamy Radha; Subramanian, Chitra; Suyambulingam, Jonekirubavathi; Ill-Min, Chung; Seung-Hyun, Kim; Mayakrishnan, Prabakaran
    A series of binuclear Co(II), Ni(II), Cu(II), and Zn(II) complexes were prepared with a novel bidentate Schiff base ligand derived by condensation of 3,3′-diaminobenzidine with creatinine. The prepared compounds were characterized by elemental analysis, magnetic susceptibility measurements, molar conductivity, FT-IR, UV-vis, 1H NMR, 13C NMR and mass spectra and thermal analysis (TGA/DTG). From spectral analysis, an octahedral geometry was proposed for the complexes except Zn(II) complex which had tetrahedral geometry. The microcrystalline nature of the complexes has been confirmed by powder XRD and SEM analyses. The molecular structures of the Schiff base L and its Zn(II) complex were fully optimized and also their quantum chemical parameters were calculated. The synthesized ligand and their metal complexes were screened against two gram-positive, gram-negative bacterial and fungal species. The results revealed that the metal complexes exhibited higher antimicrobial activity than the free ligand. The antioxidant activity of the synthesized ligand and their metal complexes was carried out by DPPH method.
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    FLOXACINS: AS MEDIATORS IN ENHANCING THE CORROSION INHIBITION EFFICIENCY OF NATURAL POLYMER DEXTRIN
    (Springer Link, 2020-01-11) Gowraraju, Nirmala Devi; Chan, Basha Nusrath Unnisa; Selvaraj, Mohana Roopan; Venkatesan, Hemapriya; Subramanian, Chitra; Ill-Min, Chung; Seung-Hyun, Kim; Mayakrishnan, Prabakaran
    Three different floxacins (Ciprofloxacin, Levofloxacin, and Norfloxacin) were used to enhance the inhibition property of Dextrin (Dex) against the dissolution of mild steel in acid medium. Substantial increase in the inhibition property was observed against mild steel dissolution by the addition of floxacins than with pure Dex. Weights loss experiments proved the potential of Fluoroquinolones (FQs) in enhaning the corrosion inhibition property of Dex on metal by proving its best ability at lower concentrations. Adsorption of Dex and floxacins on metal surface was observed to accept with Langmuir adsorption isotherm. The results from EIS studies add to the enhancing property of floxacins on Dex. While the mixed type behavior of inhibitors were confirmed by polarization studies, images from SEM, EDS and AFM gathers strength to propose the formation of protective layer.
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    ECOFRIENDLY GREEN INHIBITOR FROM HEMEROCALLIS FULVA AGAINST ALUMINUM CORROSION IN SULPHURIC ACID MEDIUM
    (Taylor & Francis Online, 2020-01-15) Ill-Min, Chung; Ramalingam, Malathy; Seung-Hyun, Kim; Kathirvel, Kalaiselvi; Mayakrishnan, Prabakaran; Mayakrishnan, Gopiraman
    This research work aims to identify a non-toxic, cheap, and effective greener inhibitor from Hemerocallis fulva (H. fulva) for corrosion of aluminum in a 1 M H2SO4 medium at different concentrations and temperatures. We investigated the inhibitive effect of H. fulva extract in a 1 M H2SO4 solution on aluminum using weight loss measurements with various concentrations and temperatures. Evaluations of the mechanism of corrosion inhibition by potentiodynamic polarization and AC-impedance analysis were also performed. The nature of the adsorption and morphology on the surface of aluminum were performed by atomic force microscopy (AFM) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) studies. The results suggested that the H. fulva extract can be used on aluminum as an efficient eco-friendly corrosion inhibitor in 1 M H2SO4 solution as identified using weight loss because the maximum corrosion inhibition efficiency η (%) was found to be 89% at 600 ppm at 303 ± 1 K. It was found that maximum η (%) was obtained at 303 ± 1 K compared to other temperatures (313, 323, and 333). The activation energy (Ea) was higher in the presence of inhibitor than in the absence of inhibitor, showing the temperature dependency of inhibition. The positive values of enthalpy of activation ΔH° and entropy of activation ΔS° reflect the endothermic and disordered nature of the reaction. Physical adsorption was proposed for the inhibition and the process followed the Langmuir adsorption isotherm. The negative value of ΔGoads indicates spontaneous adsorption. Polarization measurements clearly indicated that the H. fulva acts as a mixed inhibitor and the η (%) increases with inhibitor concentration. SEM-EDX, AFM, and XPS studies confirmed the formation of a protective layer over the surface of the aluminum specimen.
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    INHIBITION OF MILD STEEL CORROSION USING MAGNOLIA KOBUS EXTRACT IN SULPHURIC ACID MEDIUM
    (Elsevier, 2020-12) Ill-Min, Chung; Ramalingam, Malathy; Rameshkumar, Priyadharshini; Venkatesan, Hemapriya; Seung-Hyun, Kim; Mayakrishnan, Prabakaran
    Magnolia kobus DC. (M. kobus), a prominent Southeast Asian flowering plant species, was investigated for its inhibition efficiency against mild steel corrosion in 1 M H2SO4. The extract (M. kobus) was identified to have 145.80 μg/g of myricetin and 102.32 μg/g syringic acid as prominent components, with a total phenolic content (TPC) of 95.26 mg/g and a total flavonoid content (TFC) of 25.38 mg/g. The mass-loss measurements showed that 500 ppm of M. kobus extract was able to inhibit corrosion, with an efficiency of 95.01% at 303 ± 1 K. Reduction of dissolved iron content in the inhibited solution than in the inhibitor free solution observed in Atomic Adsorption Spectroscopy (AAS) revealed the corrosion mitigating effect of inhibitor on mild steel. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM) analysis of the protected and unprotected mild steel samples indicate adsorption of M. Kobus on the electrode surface. UV–vis and FT-IR studies complement the above results. The electrochemical studies indicated that M. kobus functioned as a mixed-type indicator and myricetin along with other plant components present in the plant extract contributed to the inhibition process.
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    UTILIZATION OF BIOWASTE AS AN ECO-FRIENDLY BIODEGRADABLE CORROSION INHIBITOR FOR MILD STEEL IN 1 MOL/L HCL SOLUTION
    (Elsevier, 2020-12) Venkatesan, Hemapriya; Mayakrishnan, Prabakaran; Subramanian, Chitra; Manoharan, Swathika; Seung-Hyun, Kim; Ill-Min, Chung
    This 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.
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    EVALUATION OF ANTIOXIDANT AND ANTICORROSION PROPERTIES OF EPIPREMNUM AUREUM
    (Springer Link, 2019) Mayakrishnan, Prabakaran; Venkatesan, Hemapriya; Seung-Hyun, Kim; Ill-Min, Chung
    The practice of employing ornamental plants for biological applications has been increasing for quite some time. Herein, we had evaluated the phenolic content and antioxidative potency of Epipremnum aureum (E. aureum) leaves. The total phenol and flavonoid contents were found to be 125.21 and 52.22 , respectively, in methanolic E. aureum extract (EA-MeOH). Based on the known antioxidative activity of phenol, -diphenyl- -picrylhydrazyl (DPPH 95%), nitric oxide (NO 90%), and hydrogen peroxide assays were performed, where the highest inhibition of free radicals was achieved with 100 μ EA-MeOH. The anticorrosion performance of plant-based antioxidants has gained importance; hence, the anticorrosive effect of 100% EA-MeOH on low-carbon steel (LCS) in 1M was evaluated. The inhibition efficiency [ (%)] was calculated based on weight loss and atomic absorption spectroscopy analyses. Surface analysis was carried out by Fourier transform infrared (FT-IR), UV–visible (UV–Vis) and X-ray diffraction (XRD). The results showed absorption bands at 3611.86, 3018.72, 1043.53, and 756.12 for FT-IR, absorbance bands at 221 and 251 nm for UV–Vis were observed in LCS inhibited in inhibitor (EA-MeOH). The maximum inhibition efficiency of 92.37% was achieved with 600 ppm of E. aureum extract in 1M at 1K. All these exhibit the formation of protective layer over the inhibited specimen by the inhibitor.