Browsing by Author "Shanjitha S"

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DEVELOPMENT OF A SOLID BIO-ELECTROLYTE FROM A SEAWEED EXTRACT – POLYVINYL ALCOHOL BLEND FOR PRIMARY MG-ION CONDUCTING BATTERIES
(Chemistry Europe, 2023-06-01) Suvarnna K; Shanjitha S; Selvasekarapandian S; Jone Kirubavathy S
A novel solid bio-electrolyte from seaweed acts as a potential candidate for electrolytes in batteries by solution casting technique. The ethanol extract of seaweed Sargassum Muticum (SME) is blended with PVA to prepare the bio-membrane and along with MgCl2 as the ionic provider, a solid bio-electrolyte is produced. The ionic conductivity of the prepared bio-membrane, 1 g SME+0.8 g PVA is 1.57×10−6 S cm−1. XRD analysis affirms the amorphous nature of the prepared bio-electrolytes and the highest degree of amorphous nature is apparent for the composition of 1 g SME+0.8 g PVA+0.7 wt% MgCl2. Complex formation between the SME, polyvinyl alcohol, and the added charge carrier has been made evident from the FTIR technique. Thermal properties of the bio-electrolytes by differential scanning calorimetry (DSC) are supported by the low Tg. Electrochemical impedance analysis for the prepared bio-electrolytes and the maximum ionic conductivity of 2.22×10−3 S cm−1 is exhibited by 1 g SME+0.8 g PVA+0.7 wt% MgCl2 membrane. A primary magnesium-ion conducting battery has been constructed with the highest conducting bio-electrolyte membrane and an open circuit voltage of 2.18 V validates the application of this bio-membrane as a promising solid electrolyte for energy storage devices.
INVESTIGATION OF CORN BIOMASS/POLYVINYL ALCOHOL BASED BIO-ELECTROLYTE FOR LITHIUM-ION CONDUCTING BATTERY (Article)
(John Wiley and Sons Inc, 2025-03-26) Suvarnna K; Dhanushiya P; Shanjitha S; Selvasekarapandian S; Jone Kirubavathy S
Natural corn biomass-based electrolytes blended with polyvinyl alcohol (PVA) have been prepared as the host matrix with various concentrations of lithium chloride as the ionic dopant. The optimized composition of the cornsilk extract (CSE)/PVA blend–0.9 g CSE + 1 g PVA has been prepared by the solution casting technique. The amorphous nature of the prepared bio-electrolyte 0.9 g CSE + 1 g PVA + 0.5wt% LiCl (CSLC 0.5) was confirmed by the X-ray diffraction technique (XRD). This was also supported by the differential scanning calorimetry (DSC) by the lowest glass transition temperature of 46.32 °C for the optimized CSLC 0.5 membrane. Fourier transform infrared (FTIR) spectroscopy explains the complex formation of the CSE/PVA blend with the ionic dopant lithium chloride. AC impedance analysis evidenced the maximum ionic conductivity of 2.5 × 10−3 S cm−1 for the membrane CSLC 0.5. The open circuit voltage was observed as 1.93 V, and its discharge performance has been analyzed.
INVESTIGATION OF SOLID BIO-MEMBRANE BASED ON CORN BIOMASS AS A PROTON-CONDUCTING BIO-ELECTROLYTE
(Springer Link, 2023-05-29) Suvarnna K; Shanjitha S; Selvasekarapandian S; Jone Kirubavathy S
A solid bio-electrolyte has been prepared by blending the extract of the silk part of the corn biomass (corn silk extract, CSE), polyvinyl alcohol (PVA) and NH4HCO2 as the charge carrier via the solution casting technique. This biodegradable electrolyte is optimized by the AC impedance analysis for the composition 1 g PVA + 0.9 g CSE + 0.5 wt% NH4HCO2 from their maximum conductivity values. The highest ionic conductivity for this optimized composition at room temperature is 3.302×10–3 S cm–1. This bio-electrolyte is then characterized by X-ray diffraction technique, Fourier transform infrared spectroscopy, differential scanning calorimetry, transference number analysis and electrochemical impedance spectroscopy. A primary proton-conducting battery was constructed with an output circuit voltage of 1.83 V at room temperature. A single stack PEM fuel cell has been constructed with the bio-electrolyte (0.9 g CSE + 1 g PVA + 0.5 wt% NH4HCO2) and obtained an output circuit of 480 mV. This work implies the possibility of the development of an electrolyte from a biodegradable and renewable source for energy storage applications.
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.