Browsing by Author "Sudha D"

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CORROSION INHIBITION OF INDOLOIMIDAZOLE DERIVATIVE ON MILD STEEL IN H2SO4
(International Journal of Scientific & Engineering Research, 2013-11) Sudha D; Nalini D
The corrosion inhibition of mild steel in 0.5M H2SO4 by indoloimidazole derivative namely, (3,4-dihydro-2-(phenyl)imidazo[4,5-b]indole) (DPI) has been studied using weight loss, potentiodynamic polarization, electrochemical impedance and quantum chemicalstudies. Inhibition was found to increase with increasing concentration of the inhibitor. The effect of temperature on the corrosion behaviorof mild steel was studied in the range of 303 K-343 K. Potentiodynamic polarization results show that the inhibitors act as mixed type in0.5M H2SO4. The adsorption of the inhibitors on the mild steel surface follows Langmuir and Tempkin adsorption isotherms at 303K.Molecular modeling has been conducted to correlate the corrosion inhibition properties with the calculated quantum chemical parameters.
STRUCTURAL, OPTICAL, MORPHOLOGICAL AND ELECTROCHEMICAL PROPERTIES OF ZNO AND GRAPHENE OXIDE BLENDED ZNO NANOCOMPOSITES
(Elsevier, 2023-03-01) Sudha D; Ranjith Kumar E; Shanjitha S; Alaa M, Munshi; Gamil A A, Al-Hazmi; Nashwa M, El-Metwaly; Jone Kirubavathy S
A simple cost-effective co-precipitation method was adopted to prepare ZnO nanoparticles from a metal organic framework. The synthesized ZnO nanoparticles were blended with graphene oxide (GO) to prepare the ZnO-GO nanocomposite. The physicochemical properties of ZnO nanoparticles and ZnO-GO nanocomposite were analyzed via various techniques. The structural behavior of ZnO and ZnO-GO nanocomposite was studied by XRD and FT-IR analysis. The XRD profile confirms the hexagonal structure with an average crystallite size of 19.4 nm for ZnO and 16.2 nm for ZnO-GO nanocomposites. The functional groups and the vibration modes of the samples were examined through FT-IR. It confirms the metallic presence in the ZnO and ZnO-GO samples in the wavenumber range of 400–600 cm−1. The optical properties of ZnO and ZnO-GO were studied via UV–vis spectra. The surface morphology of the samples was recorded through FESEM, and the elemental presence in the samples was examined by EDX. It confirms that the prepared samples are spherical in shape with uniform size distributions. Cyclic voltammetry has been used to study the redox behavior of electroactive ZnO and ZnO-GO composites.
SYNTHESIS AND EVALUATION OF A [(2-HYDROXYNAPHTHALENE-1-CARBALDEHYDE)-(2-BENZOTHIAZOLAMINE 6-NITRO)] CO-CRYSTAL: A FLUORESCENT CHEMOSENSOR FOR FE3+ DETECTION WITH BIOMEDICAL APPLICATIONS (Article)
(Elsevier B.V., 2025) Nagajothi A; Sudha D; Shanjitha S; Jone Kirubavathy S
A new co crystal formed by combining 2-hydroxynaphthalene-1-carbaldehyde and 2-Benzothiazolamine 6-nitro was synthesized and its structure was examined using X-ray crystallography, revealing a monoclinic arrangement. Interestingly, the benzothiazole group aligns with the aryl ring due to interactions with the amino group, while the 2-hydroxynaphthalene-1-carbaldehyde group assumes a different position, likely due to interactions with the oxygen in naphthaldehyde. Various analyses, including FT-IR and UV–Visible spectroscopy are used to characterize the co crystal and their compounds. Its ability to detect Fe3+ions was explored through fluorescent spectroscopy, exhibiting strong fluorescence at 370 nm, especially at pH 7.2, with high selectivity, low detection limits, rapid response, and reuse potential. Additionally, the compounds demonstrated notable anti-oxidant properties in both FRAP and DPPH assays. Further screenings for anti-microbial, anti-inflammatory, and anti-fungal activities were conducted and compared with established antibiotics, providing comprehensive insights into the compound's potential across diverse applications.