G-KCW Ph.D Theses
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Item APPLICATION OF LINEAR POLYESTERS AS CORROSION MITIGATORS FOR MILD STEEL REBAR TITANIUM ALLOY AND AS ELECTROLYTE IN ENERGY STORAGE DEVICES(2018) Nusrath Unnisa C; Subramanian, ChitraThe present thesis aims at describing the corrosion behaviour of metal samples under the influence of acid and its possible protective strategy. Corrosion, an unavoidable process accompanied with huge economical loss has paved a platform to identify suitable research problem. To commence with, a series of linear aliphatic and aromatic polyesters were synthesised and structurally characterised by FT-IR, 1H-NMR and 13C-NMR studies. TGA and DSC techniques were adopted to study its thermal response followed by its evaluation in protecting the mild steel in 0.5 M H2SO4. Moderate inhibition efficiency of aliphatic polyesters was enhanced by adopting a green approach, where nano metal oxides were dispersed using Persia Americana. Selected inhibitors were tested for their inhibitive action in 1 M HCl and 0.3 M H3PO4 in addition to 0.5 M H2SO4 and the results were compared. Inhibition under chloride induced medium was investigated using selected inhibitors in presence of simulated concrete pore solution. Studies adopted to protect the metals was assessed by mass loss method, electrochemical impedance spectroscopy and potentiodynamic polarisation technique. Methods used were in good agreement with each other with an end result of mitigating corrosion. To strengthen the results, morphological studies were carried out using XRD, SEM, EDS, AFM and XPS analysis. Additionally, the degradation behaviour of Ti-6Al-4V alloy in simulated body fluid medium was also monitored using electrochemical techniques along with surface studies. Attempts made and discussed in the above mentioned areas are elaborated in Part-A of this thesis. Part-B of this thesis explores the application of synthesised polyester as electrolyte in energy storage device using solution casting technique with a base of poly vinyl alcohol and dopant. Surface and elemental composition of the synthesised electrolyte was revealed from scanning electron microscopy and energy dispersive x-ray spectroscopy. Conductivity of the electrolyte was measured using AC impedance analyser and its transference number was calculated to reveal the contribution of charged species within the polymer electrolyte. Detailed review made is documented in the respective chapters followed by the summary and conclusions in chapter - X.Item CHALCONE DERIVATIVES AS ANTICORROSIVE ADDITIVES FOR MILD STEEL IN ACID MEDIUM EXPERIMENTAL AND THEORETICAL INVESTIGATIONS(2016) Anusuya, N; Subramanian, ChitranewlineItem CORROSION MITIGATION PERFORMANCE OF NATURAL AND SYNTHETIC INHIBITORS ON MILD STEEL REBAR AND TI ALLOY(2019) Anitha, R; Subramanian, ChitranewlineItem FUNCTIONALIZATION OF NOVEL BIO ENCAPSULATED BEADS IN THE CHELATION OF NOXIOUS ANIONS AND FABRICATION OF FRP DEVICE AT LAUNDRY SITES A GREENER APPROACH(2021-08) Vivithabharathi K; Muthulakshmi Andal NnewlineItem INVESTIGATION OF THE METAL COMPLEXES OF ISOMERIC NAPHTHOIC ACID WITH BASE SYNTHESIS CRYSTAL STRUCTURE AND ITS ENERGY APPLICATIONS(2023-09) Swathika, M; Arunadevi, NnewlineItem OPTIMIZATION OF ECO DERIVED ACTIVATED CARBONS NANOCOMPOSITES IN SEQUESTERING ANIONIC DYES AND METAL ION THERMODYNAMIC KINETIC STATISTICAL STUDIES(2018) Thangamani K.S; Muthulakshmi Andal NNewlineItem POTENTIAL UTILIZATION OF POD SHELL AND BIVALVE SHELL IN METAL IONS OR ANION SORPTION FROM AQUEOUS MATRICES AND INDUSTRIAL EFFLUENTS(2018) Shyamala Devi N; Muthulakshmi Andal NnewlineItem A SEQUEL DEVELOPMENT IN TRAPPING DIVALENT METAL SPECIES BY AGRONOMIAL PRODUCTS OR DERIVATIVES WITH IMPLEMENTATION OF PROTOTYPE DEVICE FOR INDUSTRIAL SCALE UP(2018) Gayathri N.S; Muthulakshmi Andal NMetal pollution of water and its sources has been receiving considerable attention in recent times due to the increasing amounts of industrial effluents discharged into the environment. Metals like lead, cadmium, nickel, copper, chromium and zinc in their common oxidation states are declared toxicants and reported to cause several physiological disorders while exceeding their permissible limits. Several reclamation technologies have been developed to reduce their concentrations. A number of low-cost and indigenous materials are identified as successful adsorbents, to remove metal ions through the process of adsorption. In this context, treated adsorbents prepared from Prosopis juliflora Bark (TPJB), Tamarindus indica Hull (TTIH) and Goat Hoofs (TGH) are employed to reduce the concentrations of three selected metal ions, since they pose better chelating nature than their respective bare ones. Adsorption of Pb(II), Cd(II), Ni(II) ions by TPJB, TTIH, TGH have been investigated through batch and column operations. The characteristics of treated materials are examined using Atomic Absorption Spectrophotometer (AAS) and the adsorption processes are confirmed by BET/ BJH, SEM, EDAX and FT-IR analyses. The optimum conditions for achieving maximum adsorption of metal ions are established. The factors which influence the reaction rates and the dynamics of adsorption are studied in order to verify the sorption behavior. The nature of adsorption and kinetic behaviour are explained by different isotherm and kinetic models. Nano materials and magnetic nanocomposites are synthesized, characterized using AFM, XRD, TG- DTA, VSM, Zeta-Potential and Particle size analyzer and tested for their sorption nature. An assessment of the comparative ability of the three adsorbents along with the order of preferential adsorption among the metal ions is made on the basis of the valid conclusions drawn from the experimental results. The exhausted material is used as fertilizer to grow seeds. The efficiencies of the adsorbents are scaled up to industrial effluents, treatment and extended to field levels through installation of a prototype device.Item