Davangere University

About: Davangere University is a education organization based out in Davangere, India. It is known for research contribution in the topics: Nanofluid & Heat transfer. The organization has 236 authors who have published 413 publications receiving 3673 citations.

Phyto assisted synthesis and characterization of Scoparia dulsis L . leaf extract mediated porous nano CuO photocatalysts and its anticancer behavior

Abstract: In this scientific report we present the synthesis of series of copper oxide nanostructures with porous nature using very rapid and efficient Solution Combustion Synthesis (SCS) methodology. The synthesis utilizes various volumes of crude leaves extract of Scoparia dulsis L. (SD). that has definite role in directing the particle size of copper oxide nanoparticles (CSD NPs) during the reduction process. The CSD NPs are well characterized by the various analytical and microscopic tools. FT-IR spectra confirms the Cu–O bond formation. The p-XRD patterns reveals the formation of copper oxide nanoparticles with average particle size of 11.95–16.64 nm. The porous morphology of the nanostructures and the elemental composition purity are evident from the micrographs obtained from Field Emission Scanning Electron Microscopy (FESEM) coupled with Energy Dispersive Spectroscopy (EDS). UV–Vis spectroscopic analysis was carried out and band gap via Tauc-plot relation and was found in the range of 3.47–3.96 eV. A large surface to volume ratio and the pore volume of CSD NPs was observed by Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) analysis. The prepared nanoparticles show enhanced photocatalytic study rendering two model dyes (Methylene blue and Methyl orange) to colorless degraded products after 180 min with efficiency more than 90%. Significant invitro anti-inflammatory behavior is observed for all CSD NPs with % protection of HRBC more than 82%. The CSD NPs proved significant cytotoxicity effect against adenocarcinomic human alveolar basal epithelial cells with IC50 value more than 95 µg/ml. Thus, the CSD NPs are believed to possess multifaceted applications in environmental and biomedical fields.

Photocatalytic and electrochemical sensor for direct detection of paracetamol comprising γ-aluminium oxide nanoparticles synthesized via sonochemical route

Abstract: Aluminium oxide nano particles (Al2O3 NPs) were synthesized using simple but effective probe sonication method. The structural, photocatalytic, and electrochemical sensor properties of Al2O3 NPs were investigated by powder X-ray Powder Diffraction (PXRD), Scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), UV–vis Spectroscopy, and Electrochemical analyzer potentiostat. The impact of sonication on the physical properties of Al2O3 NPs was elucidated. From the powder X-ray diffraction (PXRD) studies the material exhibited a face centered cubic structure and γ phase with crystallite size in the range from 6 to 16 nm. The semiconductor behavior has been confirmed from the study of energy band gap via diffuse reflectance spectroscopy (DRS). The conductivity of the samples was studied by cyclic voltammetry (CV) and Electrochemical Impedance spectroscopy (EIS) in 0.1 M HCl and 0.1 M NaOH as aqueous electrolytes. The electrode exhibited specific capacitance of 0.866 F g-1 and 0.488 F g-1 at scan rate 10 mV/s in acidic and alkaline electrolytes, respectively. EIS measurements showed reduction in the charge transfer resistance in acidic electrolyte. Modified carbon paste electrode employing γ-Al2O3 NPs has sensed Paracetamol in both acidic and alkaline electrolytes. The electrode displayed high sensitivity for paracetamol detection under varying concentrations. A linear calibration curve for paracetamol detection was obtained with a limit of detection (LOD) 2.3602 × 10−3 mol/L. These results confirm that the γ-Al2O3 NPs are promising electrode material for sensing paracetamol with high electrode reversibility and as an excellent photocatalyst.