b) 2024 - 140 Documents

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    SILVER NANOPARTICLES BASED FUNCTIONAL MATERIALS FOR ANTI-BACTERIAL AND ANTIVIRAL APPLICATIONS (Book Chapter)
    (American Chemical Society, 2024-06-26) Arunadevi, Natarajan; Kshitij RB, Singh; Pooja, Singh; Jay, Singh; Shyam S, Pandey; Ravindra Pratap, Singh
    Bacterial and viral infections are significant global health issues due to the destructive side effects of prolonged use of resistant drugs. In this regard, there is an imperative need for the progress of stable and effective substitutes to traditional antiviral drugs. Silver particles possess potent anti-bacterial and antiviral properties against several pathogens. Silver nanoparticles are the complete package of remarkable properties like, biocompatible, non-toxic, and user-friendly with excellent physical and chemical properties. In recent decades, scientists paid more attention to research related to developing and applying silver nanoparticle-based functional materials. These materials have broad applications, diagonally from sensors to therapeutic agents. The focus of this chapter is to provide a thorough analysis of silver nanoparticles in a different arena. This chapter also explores silver nanoparticles; synthesis, mechanism, and pharmacological application in wound healing, cardiovascular diseases, etc. Due to inadequate awareness about the dosage of the nanoparticles, the toxicity level was increased, leading to severe environmental impact. So, the challenges to be addressed before the commercialization of silver nanoparticles for therapy were discussed in detail.
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    SYNTHESIS AND ADVANCES OF SMART HETEROATOM-SITED FOR ANTICORROSION APPLICATIONS
    (Taiwan Institute of Chemical Engineers, 2024-07-03) Swathika, M; Sharmila, Chandran; Kshitij RB, Singh; Ravindra Pratap, Singh; Shyam S, Pandey; Arunadevi, Natarajan
    Background: Recently, there has been a significant interest in nanocomposites with porous structure, excellent thermal stability, and stiffness. The corrosion resistance behavior of epoxy resin-based Ni and Co metal oxides nanocomposite is reported here. The anti-corrosion abilities of mild steel substrates were investigated in different media like bore water, soil, and bacteria. Over 120 days, the inhibitory efficiency of the target compound was tested. Methods: The corrosion process was studied under a UV chamber at different wavelengths at 254 nm, 365 nm, and at visible region respectively. The bacterial study was carried out against the gram (+) and gram (-) on the mild steel specimen against Staphylococcus aureus and Escherichia coli. Morphological studies show the effective nanocomposite encapsulation in epoxy resin. The powder XRD method divulges the structure, and the dispersity of the epoxy layer as projected by scanning electron microscopy. Anti-corrosion properties were determined by electrochemical impedance spectroscopy (EIS) and polarization methods. Significant Findings: The results display nano CoO has improved anti-corrosion characteristics compared to nano NiO. The metal nano coating effectively protects mild steel due to barrier properties towards ions responsible for rusting, demonstrating its appropriateness as a next-generation anti-corrosive coating for a sustainable environment.
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    TARGETED ELIMINATION OF HEAVY METALS FROM INDUSTRIAL WASTEWATER: SYNERGISTIC EFFECT OF NANO METAL OXIDES
    (Taiwan Institute of Chemical Engineers, 2024-04-17) Manoharan, Swathika; Narasimhan, Muthulakshmi Andal; Sivasubramaniam, Dharani; Jay, Singh; Shyam S, Pandey; Kshitij RB, Singh; Arunadevi, Natarajan
    Background: Unprocessed solutions containing hazardous heavy metals, even in trace amounts, exert a detrimental impact on human health and pose a threat to biodiversity, hydrosphere ecosystems, and communities. Liquid waste containing heavy metals has been found to pose a notable threat to the environment. Method: In this study, nano NiO, MnO, and NiMnO3 were synthesized and characterized systematically. The nano metal oxides were used as an adsorbent for the elimination of heavy metals from industrial wastewater. Significant Findings: In view of this, the efficacy of synthesized metal oxides as potential sorbents is investigated to chelate Pb (II) ions which are present as one of the major contaminants of industrial effluents. Three adsorption systems viz., Pb(II) – NiO, Pb(II) - MnO, and Pb(II) – NiMnO3 mixture were experimentally verified by Batch equilibration and fixed bed column methods. Pre and post-run sorbent materials are characterized using SEM and EDAX analyses to examine the appropriate changes. A trial fixed bed column was run for the effluent sample, wherein 98% Pb (II) removal was registered against 96 % as observed in Batch mode. This emphasizes the potential of the synthesized metal oxides as efficient sorbents for addressing heavy metal contamination in industrial wastewater.
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    CAMELLIA SINENSIS ASSISTED GREEN SYNTHESIS OF METAL OXIDE NANOPARTICLES: INVESTIGATION OF STRUCTURAL, VIBRATIONAL, MORPHOLOGICAL AND THERMAL ANALYSIS
    (2024-06) Sathyapriya, R; Nilofur Fathima, S J; Arun Paul, C; Prakash, T; Ranjith Kumar, E; Arunadevi, Natarajan
    Metal oxide nanoparticles were created via a green combustion approach, with natural tea extract and metal nitrates as the key starting components. The X-ray diffraction (XRD) spectra were used to determine the phase of CuO, NiO, and Co3O4 nanoparticles. The findings validate the monoclinic and cubic structures of CuO, NiO, and Co3O4 nanoparticles. The X-ray diffraction (XRD) profiles of CuO, NiO, and Co3O4 nanoparticles show crystallite sizes of 25.2, 31.2, and 32.5 nm, respectively. Metal oxide nanoparticles exhibit approximately equal average crystallite diameters, demonstrating the consistency of the synthesis procedure. The FTIR spectra were utilized to investigate the functional groups and other chemical components present in CuO, NiO, and Co3O4 nanoparticles. FESEM investigation revealed a leaf-like surface morphology in CuO nanoparticles. The EDX spectra confirm the presence of metals and oxygen in the produced metal oxide nanoparticles. The study focused on the thermal stability and weight loss % of metal oxide nanoparticles. Metal oxide nanoparticles synthesized from natural tea have been shown to have good thermal stability.
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    PROLIFERATING OPTOELECTRONIC PROPERTIES OF DOPED ZNO NANOPARTICLES
    (Elsevier, 2024) Sharmila, Chandran; Arthi Priscilla, Ganesan; Nidhi, Asthana; Shyam S, Pandey; Kshitij RB, Singh; Arunadevi, Natarajan
    Ag-doped ZnO nanocomposites were synthesized precisely by adopting a wet chemical method to explore their optoelectronic characteristics for LED applications. Characterization studies have progressed for substantiation of its structural, and functional characteristics in conjugation with the optical properties of nanocomposites before and after doping. The metal-oxygen bonding was affirmed from IR spectra and excitation characteristics were detailed from UV–visible absorption spectra. The SEM images along with Energy dispersive X-ray analysis deliberates hexagonal morphology for pure ZnO which was surprisingly reformed into poly hexagon structures after doping with silver ions. The pertinence of the target material for LED application was verified by performing photoluminescence and charge density measurements. The doping of silver ions into ZnO presents a novel avenue in the field of optronics and serves as appropriate phosphors for light-emitting diodes. The application of the title compound was established by providing nano coating to LED bulb and emission efficiencies was recorded before and after coating. The present research recommends a unique method of nanocoating of LED bulb for efficient light intensity.
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    HETERO ATOM-BASED METAL COMPLEXES AS EMITTERS IN ORGANIC LIGHT-EMITTING DIODES
    (Elsevier, 2024-05-15) Swathika, M; Harshita, Rai; Kshitij, RB Singh; Shyam, S Pandey; Arunadevi, Natarajan
    The new, more energy-efficient lighting systems and high-quality displays for new age digital devices is the demand of the current generation. In this regard, focused and deliberated research has been done on transition metal complexes as effective building blocks for organic light-emitting diodes (OLEDs). The activity of divalent metallic compounds was investigated through spotlighting Co (II), Ni (II), and Cu (II) metal ions with guanidinium naphthoate as blue phosphors in OLEDs. Using spectroscopic and diffraction techniques, the phosphors produced at the optimal temperature were studied both structurally and thermally. Additionally, the target compound's photophysical investigations in a variety of organic solvents with differing polarities were examined, and the findings were presented. Because of their quick photoluminescence response time and high emission quantum efficiency, Ni (II) complexes have drawn specific attention. Ni (II) complexes precisely exhibit thermally activated delayed fluorescence (TADF) and found to be the most promising materials for future lighting technology. We compared the efficiencies of various complexes in this study to provide an overview of the development of OLEDs. To affirm the pertinency of the synthesized compounds as phosphors, studies like photoluminescence, correlated color temperature, color purity, Duv, and the Television Lighting Consistency Index (TLCI) were performed and their photometric properties were also deliberated. Ni (II) shows an magnificent luminescence character and maximum coloring index for light sources and found to be an essential component for OLEDs.
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    ENHANCING SUSTAINABILITY: CHITOSAN BIOPOLYMERS WITH AG NANOPARTICLES FOR ECO-FRIENDLY APPLICATIONS IN FOOD PACKAGING
    (Springer Link, 2024-01-23) Sharmila, Chandran; Arthi, Pricillia; Arunadevi, Natarajan; Geetha, Venkatesan
    Converting organic solid waste into biomaterials has recently contributed to reducing economic reliance on fossil fuels. Polymers derived from biomass are gaining appeal for their biofuel, biomedical, and biocomposite uses. Animal cellulose-based biopolymers such as chitosan, have piqued the interest of researchers seeking access to a sustainable biopolymer material. Chitosan films were developed through the crosslinking of chitosan and citric acid using distilled water as a solvent. A hydrogel thus formed was then cast to produce a free-standing film. A comparative analysis of these films was carried out by integrating silver (Ag) nanoparticles as dopants. The study encompasses the entire process including film synthesis, as well as the evaluation of their morphological and thermal properties. Various techniques were employed for the characterization of the films, which includes UV-Vis spectroscopy, X-ray diffraction, SEM, EDAX, AFM, TGA, and DSC. The results shed light on how the inclusion of Ag nanoparticles influences the characteristics of chitosan. Chitosan films were evaluated for migration potential towards dry foods, yielding satisfactory results in terms of their suitability for food packaging materials. The suspension of chitosan films in water was accompanied by a determination of their physical and chemical properties, revealing that water quality remained at satisfactory levels. These films were identified to meet stringent food grade standards and were observed to contribute to the reduction of biomass through their integration into the natural recycling process.
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    SYMBIOTIC STUDY OF N-BRIDGED METAL COMPLEXES AS ELECTROCATALYSTS FOR HYDROGEN EVOLUTION REACTION
    (Elsevier, 2024-01-02) Arunadevi, Natarajan; Swathika, M; Kshitij RB, Singh; Ranjana, Verma; Shyam S, Pandey; Jay, Singh
    Design and fabrication of non-noble metal catalysts for the extensive generation of H2 (hydrogen) gas by water splitting is the upsurging field aiming towards the sustainable environment and need the future clean and green energy. However, scheming and understanding the basic principle regulating the activity of the catalyst is still inexplicable. Although Pt is currently the material of choice owing to its high electrocatalytic activities but need for its high loading and high cost is an intriguing issue needing amicable solution. The hybrid structures of heteroatom-based transition metal complexes are more effective and are cost effective electrocatalysts for hydrogen production. In this proposed work, the electrocatalytic behaviour of alkali (Li+, Na+, K+) and alkaline metal (Ca2+, Sr2+, Ba2+) was figured out along with their synthetic procedure and characterization. Owing to their high complexing ability, ring formation, and bidentate nature, substituted naphthoic acid and aminoguanidine were chosen as bridging ligands. The thermodynamic stability and best catalytic behaviour of synthesized alkali and alkaline earth metals were compared and presented based on electrochemical studies. Linear sweep voltammetry (LSV) curves display excellent activity and Tafel slope was found in the range of 6.38–40 mVdec−1 in 0.5 M H2SO4. The electrochemical impedance spectroscopy (EIS) test was accomplished to recognize the mechanism of HER, and charge transfer resistance was less which indicates that composites are favourable for the hydrogen evolution. The electrochemical surface area (ECSA) was figured by studying the electric double layer capacitance (C dl) and it was found to be 0.377 μFcm2 - 0.143 μFcm2. More prominent ECSA values implies, the target complexes have enhanced electrochemically active/dynamic sites and better hydrogen evolution performance. According to the results, high-performing catalytically active sites are found to be Li [1NA-AMG] metal ions, thus showing a potential method for electrocatalyst engineering. Furthermore, in a volcano plot, the position of the Li [1NA-AMG] metal ions is found to be close to the apex with near thermoneutral catalytic activity. Based on the results, we successfully designed an electrocatalyst as a prospective candidate for hydrogen evolution reaction.