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Vigneshkumar Sekar,Karthikeyan Rajendran,Sugumari Vallinayagam,Venkataraman Deepak,Surianarayanan Mahadevan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
This study focuses on synthesis and characterization of chitosan ascorbate nanoparticles (CANs) from a salified carboxylate form of chitosan with ascorbic acid. Evident changes were observed in crystallinity and structure of CANs from their parent polymer. CANs exhibited improved antioxidative properties against DPPH, ABTS, and FRAP. In vitro effect of CANs on cervical cancer cells (HeLa) and noncancer human fibroblast cells (WI-38) viability showed portentous toxic effects on cancer cells with reduced viability on increasing CANs concentration. However, no significant effect was observed in the fibroblast cells. Further, in silico docking on cervical cancer protein targets also showed efficient binding.
Comparative study among Al2O3, ZTA, MgO/ZTA & CuO/ZTA composites in terms of Mechanical Properties
G. Gokilakrishnan,Bipin Kumar Singh,M. Vigneshkumar 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.4
Alumina (Al2O3) ceramics are one of the demanded materials in the current scenario due to its cheaper cost, abundance ofavailability and combination of high hardness and fracture toughness by reinforcement of ytrria stabilized zirconia (YSZ),Magnesium oxide (MgO), and Copper oxide (CuO). The effect of such additives inside alumina ceramics are carried out fromlast several decades but still there are many more phenomenons that are still inconclusive. So, a comparative study among thesaid additive in terms of mechanical properties is carried out to reveal the effect of YSZ, MgO and CuO additives insidealumina ceramics. At first, 10 wt. % of YSZ is doped inside the alumina matrix followed by 0.6 wt. % of MgO and 1.5 wt. % of CuO. The developed composites are thoroughly examined in terms of microstructure, bulk density, hardness, andfracture toughness. The results of the microstructure clearly reveal the homogeneous distribution of all additives inside thealumina matrix. A positive effect with YSZ and MgO is noticed on the bulk density and hardness whereas an adverse effectof CuO is observed. The values of fracture toughness are increases with all the additives due to the synergistic effect oftransformation toughening and crack bridging phenomenon.
Esakkimuthu Shanmugasundaram,Chandramohan Govindasamy,Muhammad Ibrar Khan,Vigneshkumar Ganesan,Vimalasruthi Narayanan,Kannan Vellaisamy,Rajaram Rajamohan,Stalin Thambusamy 한국탄소학회 2023 Carbon Letters Vol.33 No.7
Carbon nanofibers (CNFs) are promising materials for the construction of energy devices, particularly organic solar cells. In the electrospinning process, polyacrylonitrile (PAN) has been utilized to generate nanofibers, which is the simplest and most popular method of creating carbon nanofibers (CNFs) followed by carbonization. The CNFs are coated on stainless steel (SS) plates and involve an electropolymerization process. The prepared Cu, CNF, CNF–Cu, PANI, PANI–Cu, CNF–PANI, and CNF–PANI–Cu electrode materials’ electrical conductivity was evaluated using cyclic voltammetry (CV) technique in 1 M H2SO4 electrolyte solution. Compared to others, the CNF–PANI–Cu electrode has higher conductivity that range is 3.0 mA. Moreover, the PANI, CNF–PANI, and CNF–PANI–Cu are coated on FTO plates and characterized for their optical properties (absorbance, transmittance, and emission) and electrical properties (CV and Impedance) for organic solar cell application. The functional groups, and morphology-average roughness of the electrode materials found by FT–IR, XRD, XPS, SEM, and TGA exhibit a strong correlation with each other. Finally, the electrode materials that have been characterized serve to support and act as the nature of the hole transport for organic solar cells.