Browsing by Author "Nalini, B"
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Item Accomplishment of highly porous-lithium lanthanum titanate through microwave treatment(2016) Nalini, BPerovskite structured (ABO,) lithium lanthanum titanate (LLTO) is a successful electrolyte reported by several scientists in the recent past. It is believed that intercalation and de-intercalation of Li ions inside solid electrolyte can be improved by increasing the porosity of the material. Hence in this research work, an attempt is made to increase the porosity of the LLTO electrolyte by rapid-microwave synthesis route. The microwave prepared LLTO is compared with the sol-gel synthesized LLTO. The prepared samples are analyzed with XRD, SEM, PL and cyclic Voltammetry studies. Morphological analysis proves that microwave synthesized LLTO contains much pores compared to the Sol-gel LLTO. A remarkable difference in its electrochemical property is also demonstrated and analysed with cyclic voltammetric studies and the results are presented.Item Antioxidant, Antidiarrhoeal & Anticancerous Effect of Nanocoated Food Packages(2016) Sylvia Subapriya, M; Nalini, BItem The Best Route to Synthesis SnSb Nanoparticle with Low Distribution of Size(2011) Nithyadharseni, P; Nalini, BNano-sized particles of Sn-Sb alloy powders were synthesized by three kinds of reductive precipitation methods: rapid mixing, slow (solution) titration and slow titration with microwave assistance. The structure and morphology of synthesized Sn-Sb alloy powders were evaluated by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). Slow, rapid mixed Sn-Sb alloy powders exhibit trace of parent materials and relatively large particle size (average) of 100-250 nm. In contrast, the microwave assisted Sn-Sb shows almost negligible influence from the parent material and a narrow size distribution (40-70nm). The particle size characterization through SEM, TEM and Dynamic Light Scattering in dispersed fluid agreed well with each other.Item Carbothermal reduction of sillimanite in a transferred arc thermal plasma reactor(2013) Nalini, BConversion o f sillimanite to value-added ceramic materials was investigated by transferred arc plasma processing using nitrogen as the plasma gas. Plasma processing was carried out using sillimanite and sillimanite-cartKin mixtures at different power levels. The products were characterized by XRD, SEM and FTIR techniques. Thermodynamic analysis using hee energy minimization principle was used to predict the products formed and also analyze the experimental results. The results o f these investigations showed that sillimanite can be converted to mullite. or alumina and silicon carbide by careful choice o f the operating conditions and sillimanite-carbon ratio.Item Comparison of characteristics between Prepared and Commercial Carbon(2018-04) Roopasri, M; Nalini, BItem Comparison of Electrochemical Performance of Group IV and VI Elements in ZnCo2O4 as Symmetric Supercapacitors(2022-05) Charulatha, K; Nalini, BItem Effect of Concentration of Cerium in Tin Antimonide Alloy(2016-03) Gokila, K; Nalini, BItem Effect of Di and Trivalent Substitution in B Site of Sodium Vanadium Phosphate on Cyclability(2023-05) Jaya Dharani P V; Nalini, BItem Effect of Terbium in tin antimonide host(2016-04) Deepika. R; Nalini, BItem Effect of Zirconium as Dopant in NaFePO4 as Cathode for Sodium ion Batteries(2022-05) Gayathiri, D; Nalini, BItem Electrical and magnetic effect of transition metals in SnSb nanoalloy(2014) Nalini, BInfluence of incorporating transition metal impurities such as Fe. Co and Ni on the magnetic and electrical properties of SnSb alloy nanopowders synthesized by reductive co-precipitation is reported. Structural elucidation of all the samples by X-ray diffraction (XRD) confirms hexagonal structure and the morphological observations through scanning electron microscope (SEM) show a minimal particle size of 20 nm for the Co substituted SnSb sample, among all the other impurity incorporated samples. Compositional confirmation of Sn, Sb, Fe, Co, and Ni was made using EDAX. The X-ray photoelectron spectroscopy (XPS) is used to investigate the surface of SnSb and the change in surface activity due to the addition of transition metal impurities. The magnetic hysteresis studies indicate that SnSb and SnSb:Ni exhibit diamagnetic behaviour; while the Fe and Co incorporation resulted in ferromagnetic nature. The conductivity of SnSbiFe, SnSb:Ni shows a semiconducting nature with negative temperature coefficient of resistance; whereas pure and Co substitution exhibit metallic behaviour with positive temperature coefficient of resistance. The switching of metallic to semiconducting regime is explained in this paper. Also an attempt has been made to correlate electrical and magnetic properties with the surface oxidation effect through XPS data.Item Electrochemical Evaluation of Leaf Composited Membrane with and without Electrolytic salt for Supercapacitors(2019-07) Sumithradevi, V; Nalini, BItem Exploitation of Lanthanum as Stabilizing Agent in NaFePO4 towards Electrochemical Performance in Sodium Ion Batteries(2022-05) Kalaiyarasi, V; Nalini, BItem Fabrication and Characteristics of Flexible Thin Film Depletion Mode Field Effect Transistor (FET) using High- K Dielectric Nano Zirconia(2013) Nalini, BThis present work focuses on preparation of high quality Zirconia (Zr02) thin films, a high-K dielectric material by a modified sol-gel technique. The precursor was Zirconium (IV) Propoxide added in proper proportion with Iso Propyl Alcohol. Acetyl acetone in Iso Propyl Alcohol was used as a gelating agent. The prepared Zirconia was coated onto a glass plate and found that there was poor adhesion after firing (110“C for 4h). Hence a coating of Poly (Ethylene Terephthalate) was used before Z1O2 film formation on a glass plate, which results in better adhesive and uniform distribution. Since it is unable to peel off, the Zr02/PET film is prepared and is coated on the flexible ITO PET substrate. Then, a semiconducting SWNT layer is coated above the Zr02/PET layer. The terminals of Source, Drain and Gate are soldered using silver paste. Thus, the field effect transistor is fabricated using high-K dielectric Zr02 on a flexible PET substrate. Finally, the fabricated FET is characterized. Index terms - Field Effect Transistor; High-,K dielectric; ITO/PET; Sol-Gel Synthesis; Thinfilm; Zr0.Item Glycyrrhiza glabra - a Natural Panacea against Diarrhoea and Cancer(2016) Nalini, BThe major food borne outbreaks of diarrhoeal diseases are caused by microbes such as Escherichia coli. Salmonella enterica and Shigella dysenteriae. The present study was conducted to develop nanoparticle coatings from the medicinal plant, against diarrhea and carcinoma. The GC/MS of nanoparticles reveals the following active phyto constituents namely 9-octadecenal, tetradecanoic acid, oleic Acid, z, z 2,5- Pentadecadien-1 -ol, cis-9,10-epoxyoctadecan-1 -ol and n-hexadecanoic acid. The antioxidant and thin layer chromatography of Glycyrrhiza glabra nanoparticles showed a maximum o f520 pg and phenolic compounds. The antimicrobial activity were tested by disc diffusion showed microbial inhibition of 11,15 and 14 mm against £leo// (MTCC 40), S.enterica (MTCC 3219) and S.dysenteriae (PSGIMS&R) respectively. Therefore, commercially available food packages such as PET bottles, zip lock covers and infant feeding bottles were coated with nanoparticles and tested for shelf-life for ten days. In nanocoated PET bottles arid ziplock covers stored with tomato puree showed that till 6* day, there was no rnicrobial growth. On the 10* day, 57,68 and 88 percentage of microbial inhibition was observed in PET bottles against £.co/z (MTCC 40), S.enterica (MTCC 3219) and S.dysenteriae (PSGIMS&R) respectively. In nanocoated zip lock covers showed 38,63 and 83 percentage of microbial inhibition was observed against diarrhoeal pathogens. Nanocoated feeding bottles, showed a maximum microbial inhibition (84percentage) against diarrhoeal pathogens. Gel electrophoresis showed DNA damage to the Hela and Liver carcinoma cell lines and 50 and 48 per cent apoptosis in the two cell lines respectively. Therefore, Glycyrrhiza glabra nanoparticles are effective in diarrrhoea prevention and cancer treatment.Item Impact of Trivalent Dopants in the Electrochemical Performance of Zinc Cobaltite(2023-05) Yazhini, V; Nalini, BItem Improvized photoluminescence of tin antimonide alloy(2016-04) Muthuselvi, K; Nalini, B
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