c) 2023 - 131 Documents
Permanent URI for this communityhttps://dspace.psgrkcw.com/handle/123456789/3941
Browse
Search Results
Item STRUCTURAL AND OPTICAL PROPERTIES OF SALICYL-N-METHYL-4-STILBAZOLIUM TOSYLATE: THERMAL, DFT, MEP AND HIRSHFELD SURFACE ANALYSIS(Elsevier, 2023-01-05) Shanmuga Sundari, S; Mehala, M; Arunadevi, N; Kanchana, P; Salman S, Alharthi; Ranjith Kumar, E; Al-Douri, Y; Abd El-Rehim, A FThe structural characteristics and optimized geometry of salicyl-N-methyl-4-stilbazolium tosylate (SMST), a derivative of the prominent electro-nonlinear optic crystal 4-(N,N-dimethylamino)-N-methyl-4-toluene sulfonate (DAST) is investigated. Its morphology, spectral, vibrational, thermal, and electronic features have been examined in studies like FT-IR, UV-Transmittance spectroscopy, single crystal XRD and TG-DTA analysis. Thermal parameters like activation energy, entropy, enthalpy, and Gibbs free energy suggest that the reaction is slower and non-spontaneous. The optical constants like energy band gap, absorption coefficient, extinction coefficient, refractive index, and skin depth of SMST have been calculated. The energy band gap value is found to be 2.69 eV, which makes SMST a potential and promising material for non-linear optical applications. The dielectric behavior of SMST is in agreement with the property needed for NLO materials. Theoretical calculations like density functional theory and frontier molecular orbitals- HOMO and LUMO are investigated to analyze the structural properties, atomic arrangement, oriented geometry, and dipole moment. Molecular electrostatic potential (MEP), Hirshfeld surface, and 2D fingerprint plot analysis are examined to provide information about the molecular interaction, crystal packing, electron density, and intermolecular properties of atomic contacts. Second Harmonic Generation of SMST shows greater efficiency than urea, which confirms that SMST crystal can leads to many applications in the optical field.Item NATURAL LEMON EXTRACT ASSISTED GREEN SYNTHESIS OF SPINEL CO3O4 NANOPARTICLES FOR LPG GAS SENSOR APPLICATION(Elsevier, 2023-02-15) Vandamar Poonguzhali, R; Ranjith Kumar, E; Srinivas, Ch; Mubark, Alshareef; Meshari M, Aljohani; Ali A, Keshk; Nashwa M, El-Metwaly; Arunadevi, NA fresh lemon juice-assisted auto-combustion method was implemented for the synthesis of Co3O4 nanoparticles (Co3O4 NPs). The structural, vibrational, optical, and morphological properties of prepared Co3O4 NPs were investigated at 350 °C. The effects of lemon juice and heat treatment on the physicochemical properties of Co3O4 nanoparticles were investigated. XRD was used to investigate the structure, lattice constant, and crystallite size of Co3O4 NPs. Heat treatment at 350 °C causes the crystallite size to increase from 14.4 nm to 23.7 nm. FT-IR spectroscopy was used to investigate the functional groups and vibrational modes of unheated and heated Co3O4 NPs. Unheated and heated Co3O4 NPs had energy band gaps of 3.14 eV and 3.4 eV, respectively. TEM micrographs of heat-treated Co3O4 NPs confirm the nanoscale range of the particles, which agrees well with the crystallite size determined by XRD. The colloidal stability of Co3O4 NPs has been analyzed through zeta potential values, and the obtained values confirm that the colloidal stability of Co3O4 NPs was influenced by heat treatment. LPG based sensor behavior of Co3O4 nanoparticles has been tested with various aspects of sensing parameters. The result shows that the prepared nanoparticles can be a promising sensing material for toxic gases like LPG, CO2 and NH3Item INVESTIGATION ON GROWTH, STRUCTURE, AND PHYSICAL PROPERTIES OF AN ORGANIC CRYSTAL 2-AMINOPYRIDINIUM CYANOACETATE(Elsevier, 2023-10-05) Sivapriya, S; Subramaniyan Raja, R; Arun Kumar, A; Suryakanth, J; Arunadevi, N; Ranjith Kumar, E; Balasubramanian, KThe single crystal of 2-Aminopyridinium cyanoacetate (2APC) has been grown by solution growth slow evaporation technique. Single crystal XRD shows that the grown 2APC is monoclinic crystal system with centrosymmetric space group P21/c and the lattice parameters were found to be a = 9.8955(9) Å b = 6.1096(5) Å c = 14.6132(12) Å. The functional groups and chemical composition of grown 2APC crystal was confirmed by FTIR analysis. UV–Vis spectral study showed that grown crystal has high transparency in the entire visible region and the cut off wavelength at 369 nm. Thermal properties of the crystal were investigated by TGA/DTA analysis. Microhardness mechanical studies show that the hardness number (Hv) of a 2APC single crystal increases with the load as measured by the Vickers microhardness method. The dielectric properties of the grown crystal were analyzed by varying the frequency. The LDT and Z-Scan study were carried out to explore the laser stability and the existence of NLO property in the 2APC.Item BIONANOCOMPOSITES FOR REJUVENATION OF HEAVILY CONTAMINATED ENVIRONMENT(Elsevier, 2023) Arunadevi, N; Jone Kirubavathy, STreatment of air, land, and water is challenging for many engineers and scientists for environmental rejuvenation. A variety of methods have been explored for the removal of toxic materials. But the efficiency of these conventional methods is less. Among the different rejuvenation techniques, the adsorption process is used extensively due to its ease and low cost. After a successful search, bionanocomposites were found to be an effective and reliable environmental remediation tool. Bionanocomposites come under the class of advanced hybrid materials. They contain natural/synthetic degradable polymers along with nanomaterial. The nanocomposites play a significant role in wastewater treatment by removing contaminants such as dyes, organic compounds, and heavy metals. The attention toward bionanocomposites is owing to their physical and mechanical properties. This chapter focuses on cost-effective and efficient bionanocomposites for environmental rejuvenation.Item THREE-DIMENSIONAL APPROACHES BASED ON NANOTECHNOLOGY TOWARDS WOUND MANAGEMENT(Elsevier, 2023) Arunadevi, N; Jone Kirubavathy, SDevelopments in medicine and biotechnology have created many applications in areas such as tissue engineering. Regenerative medicines have the potential to develop patient-specific 3D tissue for customized treatment. The advancements in 3D bioprinting and nanomaterial manufacturing techniques have attracted the attention of many young researchers to the study of disease pathology. These advances enable digital fabrication techniques for biological molecules and for the encapsulation process. Compared to traditional methods, the main advantage of 3D printing is its ability to target the particular tissue construct and produce a high-resolution 3D structure through computer-aided design.