فهرست مطالب

Asian Journal of Nanoscience and Materials - Volume:5 Issue: 4, Dec 2022
  • Volume:5 Issue: 4, Dec 2022
  • تاریخ انتشار: 1401/09/10
  • تعداد عناوین: 8
  • K Sudhakara, Avvaru Praveen Kumar *, Begari Prem Kumar, A Raghavender, S Ravi, Dunkana Negussa Keniec, Yong-Ill Lee Pages 243-251
    Iron nanoparticles (NPs), due to their interesting properties, low cost preparation and many potential applications in ferrofluids, magneto-optical, catalysis, drug delivery systems, magnetic resonance imaging, and biology, have attracted a lot of interest during recent years. In this research, γFe2O3NPs were synthesized through simple co-precipitation method followed by thermal treatment at 300 °C for 2 hours. In our synthesis route, FeCl3 and FeCl2 were employed as precursors to synthesize γ-Fe2O3NPs. This approach is very effective and economical. The γ-Fe2O3NPs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM),and vibrating sample magnetometer (VSM). The XRD and FT-IR results indicated the formation of γ-Fe2O3NPs. The SEM and TEM images contributed to the analysis of particle size and revealed that the γ-Fe2O3 particle size of the nanopowders ranged from 11 and 13 nm. Magnetic property was measured by VSM at room temperature and hysteresis loops exhibited that the γ-Fe2O3 NPs were super-paramagnetic. The synthesized γ-Fe2O3NPs were applied in order to synthesize mono-triazoles within one molecule using azide-alkyne cycloaddition reactions. KEYWORDS: γ-Fe2O3 Nanoparticles,
    Keywords: γ-Fe2O3 Nanoparticles, Co-precipitation method, Characterization, Catalysis
  • Pigewh Amos *, Hitler Louis, Kayode Adesina Adegoke, Ededet Akpan Eno, Akakuru Ozioma Udochukwu, Thomas Odey Magub Pages 252-293

    Interestingly, copper has been identified as an ideal metal catalyst for an industrial scale electrochemical reduction of CO2 to various value-added chemicals relative to other metal catalysts reported so far. This is due to the fact that copper and copper-based materials have the potential to convert CO2 to oxygenates such as ethanol, methanol, formates etc. and hydrocarbons such as ethane, methane etc. Mechanistic details on how these products are formed on the catalyst-electrolyte interphase during the reduction process have remained relatively uncovered. This review, therefore, seeks to uncover the mechanism of electrochemical reduction of CO2 on Cu/Cu based electrodes, factors that affect catalytic activity and selectivity for these electrodes as reported in the various literature. This paper is therefore organized as follows: section 1 covers the introduction; an overview of some basic concepts in electrochemical CO2 reduction (ECR) was discussed in section 2, experimental studies were discussed in section 3, and finally the conclusion.

    Keywords: Copper electrode, Catalyst, Mechanism, CO2 reduction, Selectivity
  • Essamhassan G Arafa Gomaa *, Moustafa Diab, Adel Elsonbati, Hamed M Abulenader, Asmaa Helmy Pages 294-302
    The redox mechanisms were examined for copper chloride in absence and presence of Orange G (OG) at 19.1°C using Carbon glassy electrode (CGE). The supporting electrolyte used is 0.1 M KCl effect of scan rate was also studies for the redox reactions for CuCl2 alone and in presence of the ligand used orange G (OG). Stability constants for the complex formed from the interaction of CuCl2+ Orange G (OG) were evaluated with the different thermo chemical data. Effect of different scan rates were examined for cupric Chloride in absence and presence of the ligand used Orange G (OG).The different scans used are 0.1, 0.05, 0.02 and 0.01 V/Sec. The stability constants and Gibbs free energies of complexation were also estimated for the interaction of CuCl2 with Orange G (OG) in 0.1MKCl supporting electrolyte.
    Keywords: Solvation parameters, Cyclic Voltammetry, copper chloride, orange G (OG), glassy carbon electrode (CGE)
  • Reza Ghiasi *, Faegheh Aghazadeh Kozeh Kanani Pages 303-312
    In the present research, the dipole moment, electronic structure, frontier orbitals energy, and aromaticity in the graphyne and Si-doped graphynes were studied with M062X quantum chemical computation. The relative energies of four possible isomers of Si-doped graphyne were calculated. Also, the ionization potential (IP) and electron affinity (EA) values of the studied molecules were reported. Frontier orbital (HOMO-LUMO) gap values were used for illustration of conductivity of these molecules. Aromaticity of the cycles of studied molecules was investigated by nucleus independent chemical shift (NICS) values and electron localization function (ELF).
    Keywords: Graphyne, Si-doped Graphyne, Nucleus independent chemical shift (NICS), electron localization function (ELF)
  • Mukti Sharma, Saurabh Yadav, Man Srivastava, Narayanan Ganesh, Shalini Srivastava * Pages 313-326
    Phyto-compounds facilitated synthesis of nanoparticles has created an exceptional impact in the formation of nanoparticles and is used for the synthesis of modern nano drugs. Ignorance about phytochemical composition particularly knowledge of the bio-active principle of medicinal plant restricts the demonstration of the real picture of the enhancement of any bio-efficacy. The present communication scientifically established anti-inflammatory bio-efficacy in seeds of the folk plant Madhuca longifolia and its significant enhancement by bio-active principle (saponin) loaded silver nanoparticles (S@AgNps). A family of four saponins has been explored quantified (3.59%) and characterized (Micro Mass ESI-TOF MS spectra). Synthesis of S@AgNps has been conducted in a green single step and thoroughly characterized. In- vivo assessment of anti-inflammatory bio-efficacy has been carried out using carrageenan induced hind paw edema in Swiss albino mice model. Anti-inflammation bio-efficacy of native seed extract (15 mg/kg/bw) was found 46.84% which was further elevated and further rose to 56.10% by saponin at considerable low optimized dose (1.5 mg/kg/bw). Anti-inflammatory bio-efficacy was further successfully enhanced to (70.99%) by S@AgNps, almost close to that of reference drug (Diclofenac sodium; 76.42%). Saponin loaded silver nanoparticles (S@AgNps) prepared from the seed extract of the plant M. longifolia seem to be an ideal candidate for the development of complimentary herbal nanomedicine for anti-inflammation.
    Keywords: Madhuca longifolia, Green synthesis, Saponin loaded silver nanoparticles Enhanced anti-inflammatory activity
  • Mahdi Rezaei Sameti *, B. Amirian Pages 327-335
    In this paper, by using of density function theory (DFT), we have investigated the interaction and adsorption of Cd+2 ion on the interior and exterior surface of pristine, C, P and C&P doped BNNTs. The calculated results indicate that the adsorption of Cd+2 is exothermic in thermodynamic approach. With adsorbing Cd+2 ion the electrical and optical properties of system alter significantly from original state. Inspection of quantum, natural bond orbital (NBO) and reduced density gradient (RDG) results confirm that the pristine and doped BNNTs are a good candidate to making sensor and adsorbent of Cd+2 in biological and environmental system.
    Keywords: BNNTs, Adsorption Cd+2, DFT, RDG
  • Iran Sheikhshoaie *, Azimeh Rezazadeh, Samaneh Ramezanpour Pages 336-345
    Nano Co3O4/ZnO has been successfully synthesized by a simple and green gel combustion method followed by calcination at 600 o C. Sugar was used as fuel for combustion in this work. The nano Co3O4–ZnO was characterized by X-ray diffraction (XRD), Energy Dispersive X-Ray analysis (EDAX) and Scanning electron microscopy (SEM). Co3O4–ZnO was applied as an adsorbent to remove lead from aqueous solution.EDAX strongly proved the adsorption of lead on the surface of Co3O4-ZnO adsorbent. By increasing the amount of ZnO on the structure of the Co3O4-ZnO samples, the adsorption of Pb2+ on the surface was increased too. The SEM images also help the confirmation of lead adsorption on the surface of as synthesized samples. The concentrations of remained Pb2+ ions were also measured by atomic absorption spectroscopy (AAS) and reported in terms of removal efficiency.
    Keywords: Gel combustion, Adsorption, Lead removal, Nanosized Co3O4, ZnO
  • Mohamed A Morsi, Essam Gomaa *, Alaa S Nageeb Pages 346-357
    The redox behavior for nano cadmium chloride (Ncc) was studied using cyclic voltammetry in the absence and presence of isatin (Isa.) on the use carbon glassy electrode (CGE) prepared in laboratory in 0.1M KCl electrolytic solution at two different temperatures . All cyclic voltamograms were carried at the selected temperatures in the absence and presence of isatin (Isa.). The redox reactions and reaction mechanism were suggested. All avialable cyclic voltammetry and thermodynamic data were calculated from cyclic voltammetry measurments and their values were explained .All the thermodynamic parameters necessary for the interaction of nano CdCl2 withisatin were calculate,explained and interapretatited.
    Keywords: Cyclic Voltammetry, thermodynamic parameters, nano cadmium chloride (Ncc), Isatin (Isa)