Performance Evaluation of Cyclic Stability and Capacitance of Manganese Oxide Modified Graphene Oxide Nanocomposite for Potential Supercapacitor ApplicationsRead the full article
Journal of Nanomaterials publishes research on nanoscale and nanostructured materials with an emphasis on synthesis, processing, characterization, and the applications of nanomaterials.
Chief Editor Stefano Bellucci is Professor of Theoretical Physics at the National Institute for Nuclear Physics in Frascati, Italy. His research interests include nanoscience and nanotechnology, nanocarbon-based composites, and the biomedical applications of nanomaterials.
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Structural and Optical Properties of CdSe/CdTe Core-Shell Quantum Dots
A simple hydrothermal method is developed for the synthesis of high-quality type II core-shell CdSe/CdTe quantum dots (QDs). The XRD results reveal the formation of mixed phases of CdSe and CdTe with a grain size of 12.6 nm. SEM morphology confirms the uniformly distributed nanoscale CdSe/CdTe with no agglomeration. EDX confirms the elemental presence of Cd, Se, and Te in the compound. TEM results suggest that the size of spherical CdSe/CdTe core-shell QDs is in the range of 8~10 nm. Significant results of the SAED pattern confirm the core and shell components as CdSe and CdTe, respectively. The correlation between the synthesis procedures and the corresponding structures of the core-shell CdSe/CdTe QDs is discussed. The demonstrated monodispersed lattice structure of core-shell CdSe/CdTe QDs has excellent PL emission properties at which is suitable for photovoltaic applications. The UV-Vis absorption bands at 455 nm and 560 nm confirm exciton emission due to the type II matrix of CdSe/CdTe QDs.
Fabrication of MnO2 Nanocomposite on GO Functionalized with Advanced Electrode Material for Supercapacitors
A new strategy for supercapacitor formation was carried out in the study using electrodes made of graphene oxide (GO) and manganese dioxide (MnO2) nanocomposites. To the present knowledge, only a few investigations have been carried out concerning the synthesis of GO-MnO2-based nanocomposites and their electrochemical properties, with varying mass ratios, as well as the change in electrochemical properties of their components as MnO2 and GO were tested individually for the enhanced stability and performances. A synthetic method was performed successfully to manufacture MnO2/GO nanocomposites. The findings of the present study show that the composites have a lot of potential as an effective conduction property. A composite of graphene oxide supported manganese dioxide nanocomposites fabricated with the simple soft chemical route. As-prepared nanocomposites can be improved in performance by the interactions between GO and MnO2.
Synthesis, Characterization, and Antibacterial Activity of ZnO Nanoparticles from Fresh Leaf Extracts of Apocynaceae, Carissa spinarum L. (Hagamsa)
Biosynthesis of nanoparticles is a new way to produce nanoparticles by using bioorganic foundations. It is attainment care because it is cost-effective, eco-friendly, and comprehensive measure manufacture potentials. The application of leaf extract to depose nanoparticles has been taken as a green method. In this study (Carissa spinarum L.), leaf extracts were reserved for examining their possibility to prepare zinc oxide nanoparticles (ZnO NPs). Zinc acetate is used as the source of zinc; deposition temperature and time were 80 degree Celsius and 60 minutes, respectively. The characterization study was done by UV-Vis spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL). The surface plasmon resonance around 358 nm from the UV–Vis qualitative evaluation result represents the ZnO NPs formation. The crystalline shape of nanoparticles is disclosed inside the XRD result, morphology confirmed through SEM effects, and consequently, the ZnO NPs scale was predicted. We have given allotted the image-catalytic degradation of excitement dye at 365 nm in image reactor victimization ZnO NPs. This will be our preliminary strive at the Carissa spinarum L. extract on ZnO NPs guidance, and degradation reveals that ZnO NPs showcase clever image-catalytic belongings, and zinc oxide (ZnO) nanoparticles were created to be operative against Bacillus and Staphylococcus.
Utilization of Superparamagnetic Iron Oxide Nanoparticles (SPIONs) Impregnated Activated Carbon for Removal of Hexavalent Chromium
Chromium (Cr) is a toxic heavy metal present in industrial effluent which could cause degenerative diseases on ingestion. Therefore, elimination of Cr from contaminated water becomes essential to preserve and sustain the quality of life. In this study, superparamagnetic iron oxide nanoparticles (SPIONs) were impregnated on activated carbon and checked for enhanced removal of Cr(VI). Thus, granular activated carbon (N-GAC) of mesh size was impregnated with SPIONs to produce SPIONs impregnated activated carbon (Sp-GAC) and characterized using UV-VIS spectrophotometer, FT-IR, SEM-EDX, XRD, and VSM. Sp-GAC was found to be possessing superparamagnetic behavior, and it was used in batch adsorption study where the adsorption parameters like pH, concentration of adsorbent, and adsorbent-adsorbate were optimized. It was found that Cr(VI) adsorption was predominant at acidic pH (pH 3) for both cases; moreover, N-GAC showed better adsorption comparatively. Both the N-GAC and Sp-GAC adsorption were found to be obeying to Langmuir.
Cotton Fabric Dyed with Self-Dispersive and Reactive Nanocarbon Black for Enhanced Static Resistance and UV Protection
Amino functionalized nanocarbon black (CB/KH550) was prepared in reaction between KH550 and nanocarbon black (CB). 2-(4-(4,6-dichloro-1,3,5-triazin-2-ylamino)phenylsulfonyl)ethyl) sodium sulfate (SDTES) was synthesized and characterized. Self-dispersive and reactive nanocarbon black (CB/KH550/SDTES) was prepared by nucleophile substitution reaction and characterized by FTIR, TEM, zeta potential, and TG analysis. Cotton fabric was dyed with CB/KH550/SDTES by dip-dyeing method and was observed by SEM. Moreover, color depth, static resistance, UV protection, tensile property, and rub fastness of cotton fabric were measured and analyzed. Results showed that CB/KH550/SDTES demonstrated excellent dispersion stability. The dyed cotton fabric possessed adorable antiultraviolet and antistatic properties. The preparation mechanism of the cotton fabric dyed with CB/KH550/SDTES was proposed.
Heat and Mass Transfer of the Darcy-Forchheimer Casson Hybrid Nanofluid Flow due to an Extending Curved Surface
The current paper describes a Darcy-Forchheimer flow of Casson hybrid nanofluid through an incessantly expanding curved surface. Darcy-Forchheimer influence expresses the viscous fluid flow in the porous medium. Carbon nanotubes (CNTs) with a cylindrical form and iron-oxide are utilized to make hybrid nanofluids. Using Karman’s scaling, the principal equations are rearranged to nondimensional ordinary differential equations. The “Homotopy analysis method” is used to further build up the analytic arrangement of modeled equations. The impact of flow variables on the velocity and temperature profiles has been tabulated and explained. The flow velocity is raised when both the curvature and volume fraction parameters are elevated. The temperature and velocity profiles exhibit the opposite tendency when the Forchheimer number is increased, since the fluid velocity decreases while the energy profile grows. The addition of CNTs and iron nanocomposites improves the thermophysical characteristics of the base fluid significantly. The obtained consequences show that hybrid nanofluids are more efficient to improve the heat transfer rate. Using CNTs and nanomaterials in the base fluid to control the coolant level in industrial equipment is a wonderful idea.