F-KCW-Department Publications
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Item GROWTH, STRUCTURAL, DIELECTRIC AND OPTICAL CHARACTERISTICS OF GLYCINE PHOSPHITE SINGLE CRYSTALS(ScienceDirect, 2020) Shanmuga Sundari S; Kanchana P; Arunadevi N; Shobana CInteresting compounds are formed when glycine reacts with inorganic materials. These compounds exhibit phase transitions with exciting dielectric and elastic properties. In this aspect, glycine with orthophosphorus acid forms glycine phosphite (GPI) single crystals. Good quality, optical transparent glycine phosphite (GPI) single crystals are grown from aqueous solution. GPI crystals have a wide range of nonlinear optical applications. The present work focuses on the growth of GPI from its aqueous solution by slow evaporation method. The PXRD (powder XRD) pattern recorded at ambient temperature shows the single phase nature of the grown GPI crystals and it exists in the monoclinic system with space group P21/a. Etching studies were carried out to know more about the growth morphology and FTIR spectra shows the presence of a variety of normal mode vibration of GPI crystals. Dielectric studies were carried out from 100 K to 383 K. the ferroelectric to para electric transition was observed at 201 K. The dielectric relaxation of the grown crystals was studied using Debye fitting. The activation energy associated with the transition was also calculated. As the GPI crystals are paraelectric at room temperature, no second order non linearity was observed.Item OPTICAL AND BIOLOGICAL CHARACTERISTICS OF NOVEL ORGANIC SINGLE CRYSTAL 4-CHLORO N-METHYL 4-STILBAZOLIUM TOSYLATE(ScienceDirect, 2020) Arunadevi N; Kanchana P; Mehala M; Shanmuga Sundari SWhen compared with inorganic materials, the molecular organic materials acquire significant interest because of their considerable nonlinear optical properties, virtual unlimited design possibilities and extremely fast response times. Amongst them, organic crystals which are based on the charged chromophores and substantial Coulomb interaction have a number of benefits over non-ionic species, like first-order hyperpolarizability or greater molecular nonlinearity, durable stability and having a larger capability to override the dipole–dipole interactions and therefore it forms a non-centro symmetric macroscopic packing. For instance, DAST (4-N, N-dimethylamino-4′-N′-methyl-stilbazolium tosylate), the organic salt crystal, is one of the finest nonlinear optical materials having larger second-order nonlinear optical susceptibilities. Even though benchmark stilbazolium crystals display a great macroscopic nonlinearity and noble crystal characteristics, improving these physical properties comprising the environmental stability is a provocative topic. Based on this, the present paper discusses the growth of cationic substituted DAST namely 4-chloro -N-methyl 4-stilbazolium tosylate (CMST). Knoevenagel reaction method was used to synthesis CMST salt using Dean-Stark apparatus. The synthesized salt of CMST was dried at 100 °C for 24 h. The dried CMST salt was used to grow the crystals after three recrystallization process. Based on the solubility curve new solvent, mixture of methanol and acetonitrile was used to grow the crystals at room temperature by slope nucleation method. Structure of the grown crystals was characterized using single crystal XRD and FTIR. The compositional analysis was carried out using NMR and CHN analysis. Luminescence characteristics was studied using photoluminescence spectrum. The dielectric characteristics ware carried out from room temperature to 250 °C. Invitro analysis was carried out in the cancer cell line to study it’s anti-cancer activity.Item LEMON JUICE (NATURAL FUEL) ASSISTED SYNTHESIS OF MGO NANORODS FOR LPG GAS SENSOR APPLICATIONS(Elsevier, 2021-02) Vandamar Poonguzhali R; Ranjith Kumar E; Pushpagiri T; Ananth, Steephen; Arunadevi N; Baskoutas SLemon juice assisted combustion method was adopted to prepare MgO nanorods. The role of heat treatment on structural, morphological and gas sensing properties of MgO NPs has been analyzed. The phase analyses of the samples were analyzed using X-ray Diffraction (XRD). The single-phase nanostructure of MgO nanoparticles has been identified from the XRD spectra. The average crystallite sizes are found to be in the range 7.8 nm–19.2 nm. The nanorod like structure of MgO has been recorded through SEM and TEM. The size of MgO nanostructure recorded from TEM is well matched with the crystallite size calculated by XRD. The lemon assisted synthesis of MgO nanoparticles show noticeable gas sensing properties for various gases. In different aspects, gas sensing response of MgO nanoparticles have been analyzed for different gases. The maximum sensing response ~70% has been recorded for LPG at the optimum temperature (OT) 300 °C with the gas concentrations 1000 ppm.Item STRUCTURAL, OPTICAL, THERMAL, BIOLOGICAL AND MOLECULAR DOCKING STUDIES OF GUANIDINE BASED NAPHTHOATE METAL COMPLEXES(Elsevier, 2021-06) Arunadevi N; Swathika M; Prabha Devi B; Kanchana P; Shanmuga Sundari S; Jone Kirubavathy S; Subhapriya P; Ranjith Kumar EThe present work reports the complexation of few d-block metals with 3-hydroxy-2-naphthoic acid and guanidine which yields corresponding mononuclear complex bis(guaninium) 3-hydroxy-2-naphthoate metal (II) dihydrate of the type M(CN3H5)2{C10H6(3-O)(2-COO)}].2H2O, where M= form Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Pb(II) and Ca(II) of ratio 1:2:4 – metal: acid: base. Characterization of the complexes were done by elemental analysis, IR spectra, UV-Visible spectroscopy, TG-DTA, powder XRD. TG-DTA study reveals various decomposition pattern and thermal stability of the metal complexes. Crystalline nature of the metal complexes is confirmed form powder XRD measurement. SEM coupled with EDAX and AFM confirms the presence of nano-sized metal oxides. Antibacterial studies of the metal complex prove that they are active against Bacillus subtilis and Escherichia coli. Furthermore, molecular docking was carried out for a study of physicochemical properties and to show the binding energy of ligands with proteins.Item NATURAL CITRIC ACID (LEMON JUICE) ASSISTED SYNTHESIS OF ZNO NANOSTRUCTURES: EVALUATION OF PHASE COMPOSITION, MORPHOLOGY, OPTICAL AND THERMAL PROPERTIES(Elsevier, 2021-08-15) Vandamar Poonguzhali R; Ranjith Kumar E; Sumithra M.G; Arunadevi N; Sharmila Rahale C; Alaa M, Munshi; Gaber A M, Mersal; Nashwa M, El-MetwalyIn recent years, because of their excellent electrocatalytic action and applications in different fields, metal oxide nanostructures have received massive consideration from scientists. Zinc oxide nanostructures are useful materials for a range of sensing applications and possess admirable electrocatalytic properties and stability. The current research presents the natural citric acid assisted synthesis of ZnO nanostructures and their structural, optical, morphological and thermal properties. X-ray diffraction was studied for the phase assessment of as prepared (Z1) and annealed ZnO (Z2) nanostructures and the crystallite sizes of the Z1 and Z2 samples were also located in the range between 35 nm and 38 nm. FESEM and TEM experiments were carried out to explore the surface features of Z1 and Z2 samples. The polycrystalline existence of the samples is demonstrated by the hexagonal, cubic and spherical shaped ZnO nanostructures. The energy band gap of Z1 and Z2 samples was determined (3.16 eV for Z1 and 3.12 eV for Z2) from the UV spectrum. The impact of annealing treatment on the thermal stability of ZnO nanostructures was studied and the main peak was observed for the Z1 sample at ~249 °C and for the Z2 sample at ~289 °C.Item PREPARATION AND EVALUATION OF N, N1-METHYLENEBISACRYLAMIDE CROSSLINKED POLYMER FOR THE CONTROLLED RELEASE OF WATER AND FERTILIZER IN AGRICULTURE SECTOR(AIP Conference Proceedings, 2021-08-05) Dhanapal V; Subhapriya P; Arunadevi N; Radjarejesri SThe present study involved in the synthesis of a series of hydrophilic crosslinked superabsorbent polymer (SAP) materials by free radical thermal copolymerization method using methacrylic acid (MAA), 2-hydroxyethyl methacrylate (HEMA), acrylamide (AM) as monomers and N,N1-methylenebisacrylamide (N,N1-MBA) as crosslinker. The structural (FT-IR), thermal stability (TGA/DTG), morphological features (SEM), water, fertilizer uptakes and release characteristics of synthesized SAPs were analyzed for field application. An optimized polymer composition had absorbed 839 g/g of water and it released the imbibed water over a period of 23 days. Fertilizer uptake investigation revealed that 85, 70 and 80% of urea, potash and superphosphate respectively were absorbed from their 1% solution and it had released only 33, 39 and 45% of urea, potash and superphosphate respectively at room temperature in a single absorption-desorption cycle. The results indicated that the obtained polymer may be used as matrix for the controlled release of water and fertilizers in agriculture sector.Item METAL OXIDES: ADVANCED INORGANIC MATERIALS(Elsevier, 2022-01-14) Arunadevi N; Jone Kirubavathy SMetal oxides are significant materials in recent research scenario in pharmaceutical applications like anti-oxidant, anti-fungal, antimicrobial, etc., photovoltaic applications with higher efficiency, thin film material, biomedical implant materials, bio-imaging and drug delivery applications, dietary supplements, biosensing platforms, electrodes in various electrochemical cells, photocatalyst, corrosion materials and so on. The present review includes the applications of metal oxides and its composite materials in various fields, their significance in corrosion and electrochemical studies, and their mechanisms. It also highlights its biomedical importance and as sensors which are useful in creating an ecofriendly platform.Item DESIGNING AN ENHANCED SELF-SUPPORTED TRANSITION METAL COMPLEXES BASED ON ELECTROCATALYSTS FOR HYDROGEN EVOLUTION REACTION(Taylor & Francis Online, 2023) Swathika M; Arunadevi NProgressing efficient and low-cost catalysts to reduce overpotential within the hydrogen evolution reaction (HER) in large-scale production is highly desirable in the present era. The catalysts are accustomed to initiating an excellent approach to optimizing the electronic characteristics employed to boost their electrocatalytic production. In this article, we described the activity of transition-metal complexes with the nitrogenous analog of carbonic acid and naphthalene ring containing monocarboxylic acid to study hydrogen evolution reactions. The HER activity in transition metal complexes was varied through physicochemical and electrochemical properties. Density function theory (DFT) was calculated using the B3LYP hybrid functional and the basis set of 6-311 + G (d,p) to deliver the relevant frontier orbitals.Item BIONANOCOMPOSITES FOR REJUVENATION OF HEAVILY CONTAMINATED ENVIRONMENT(Elsevier, 2023-06-23) 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 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.