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Jayanthi S.N.,Center for Material Science | Prabakaran A.R.,Pachaiyappas College | Subashini D.,Pachaiyappas College | Thamizharasan K.,Sir Theagaraya College
Materials Today: Proceedings | Year: 2015

L-histidinium perchlorate, a semi-organic crystal has been grown by slow evaporation solution growth technique at room temperature. The growth of L-histidinium perchlorate was confirmed by single crystal X-ray diffraction analyses. Results of indentation-induced hardness testing are presented. The Vicker's hardness of the material in the load range 10-100g was 29-59Kg/mm2. The values of elastic stiffness constant, fracture mechanics, brittleness index and yield strength have also been calculated. The dielectric measurements of the crystal in the frequency range 100Hz-1MHz were investigated. The activation energy of electrical processes was also calculated and reported. © 2015 Elsevier Ltd. Source


Jayachandra R.,Vellore Institute of Technology | Lakshmipathy R.,Center for Material Science | Reddy S.R.,Vellore Institute of Technology
Journal of Molecular Liquids | Year: 2015

Herein we report the synthesis of new hydrophobic ionic liquid by simple manipulations starting from d-galactose. The synthesized ionic liquid 1-methyl-3-(((3aS,5S,5aR,8aR,8bS)-2,2,7,7-tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4',5'-d]pyran-5-yl)methyl)-1H-imidazol-3-ium hexafluorophosphate(V) (IL 5) was completely characterized by sophisticated analytical techniques. IL 5 was investigated as adsorbent for the sequestration of Pb2+ ions from aqueous solution and this is proved as its potential application. Batch mode studies were done, by varying the batch parameters such as pH, IL dose, contact time, initial metal ion concentration and temperature. Various mathematical models such as kinetic models and isotherms were employed to understand the mechanism of sequestration. Thermodynamic investigations suggest that the sequestration of Pb2+ ions is spontaneous and exothermic in nature. The maximum loading capacity of IL 5 was found to be 374.9mgg-1. Desorption and regeneration analysis revealed the repeated use of IL 5 in industrial processes. These results suggest that IL 5 is a potential sorbent for the elimination of Pb2+ ions from aqueous solution. © 2015. Source


Kumar M.,Pondicherry University | Kumar M.,Center for Material Science | Subramania A.,Pondicherry University | Balakrishnan K.,Pondicherry University
Electrochimica Acta | Year: 2014

Co3O4 nanofibers are prepared by electrospinning technique and they are characterized by thermogravimetry analysis (TG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) studies. BET analysis revealed that Co3O4 nanofibers have high specific surface area. Electrochemical properties of the electrospun Co3O4 nanofibers electrode performance are characterized by cyclic voltammetry (CV) and galvanostatic charge-discharge measurements in a 6 M KOH electrolyte using a three-electrode system. The electrospun Co3O4 nanofibers exhibit a specific capacitance of 407 F g-1 at a scan rate of 5 mVs-1. Futhermore, the Co3O4 nanofibers show an excellent cycle stability and better capacity rentation with 94% after 1000 continuous charge-discharge cycles at a constant current density of 1 Ag-1. Moreover, the enhanced supercapacitor performance is mainly due to its unique nanofibers structure provides larger reactive surface area capable of fast ion and electrone transfer. The results are compared with the existing reported systems in the literature. © 2014 Elsevier Ltd. All rights reserved. Source


Venugopalarao G.,Vellore Institute of Technology | Lakshmipathy R.,Center for Material Science | Sarada N.C.,Vellore Institute of Technology
International Journal of Nanomedicine | Year: 2015

Background: The application of antibiotics has been limited due to weak biodistribution and pharmacokinetics. Encapsulation of these drugs in lipid vesicles might be a good solution for obtaining the required properties. Liposomes are one of the most suitable drug-delivery systems to deliver the drug to the target organ and minimize the distribution of the drug to non-target tissues. Objective: The study reported here aimed to develop cefditoren pivoxil liposomes by thin-film hydration, characterize them in terms of physical interactions, and undertake in vitro and in vivo release studies. Methodology: The pre-formulation studies were carried out using Fourier-transform infrared spectroscopy and differential scanning calorimetry. Cefditoren pivoxil liposomal formulations were formulated by thin-film hydration using biomaterials ie, soya lecithin and cholesterol in different molar ratios. The best molar ratio was determined by in vitro studies such as entrapment efficacy, particle size distribution, and diffusion. Results: From the in vitro release studies, it was found that the formulation that contained soya lecithin and cholesterol in a 1.0:0.6 molar ratio gave good entrapment of 72.33% and drug release of 92.5% at 36 hours. Further, the formulation’s zeta potential and surface morphology were examined and stability and in vivo studies were undertaken evaluating the pharmacokinetic parameters, which showed promising results. Conclusion: Formulation CPL VI showed the maximum drug-loading capacity of 72.3% with good controlled release and acceptable stability when compared with the other formulations. In vivo studies in rabbits showed that the drug release from the liposomes was successfully retarded with good controlled release behavior which can be used to treat many bacterial infections with a minimal dose. © 2015 Venugopalarao et al. Source


Andal V.,Center for Material Science
International Journal of ChemTech Research | Year: 2015

Nano-Fe2O3 was synthesized by precipitation method using starch as the precipitating agent. The characterization of the samples by XRD (X-ray diffraction) technique confirmed the formation of Fe2O3..Analysis by SEM (scanning electron microscope) was carried out to study the morphology and particle size. The SEM image shows that the particles are spherical in nature. The as prepared samples contained rhombohedral phase. MR fluid was prepared using Fe2O3 nano powder, silicone oil and grease. The aim of the work was to determine the viscosity of the MR fluid, under the influence of different values of electromagnetic field. To determine the viscosity and damping coefficient a modified experimental setup was fabricated. © 2015, Sphinx Knowledge House. All rights reserved. Source

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