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The present study was reported with synthesize of copper oxide nanoparticles by ethno botanical species. Bio convivial and compatible approaches were made to utilize the renewable source of leaves extract of Achyranthes aspera Linn as efficient capping and stabilizing agent as well. Also, natural A. aspera was functioned as reductant in the formation of CuO NPs. The phytosynthesized CuO nanoparticles were extensively characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy, Scanning electron microscopy, Energy dispersive X-ray diffraction, High resolution tunnelling electron microscopy and also comprehensively examined their biological applications like antibacterial and antifungal susceptibility against E. lenta, E. aerogenes and C. albicans strains. An XRD result of prepared CuO nanoparticles reveals the monoclinic crystalline structure and average crystallite size of 11–16 nm. The morphology variations for different concentrations of precursor material were noticed by SEM image. Furthermore, the crystalline planes found in SAED pattern of synthesized CuO NPs were coincide to the analysed XRD spectra. In the present study, a novel green approach was used to synthesize of CuO NPs for the antibacterial activity of poorly characterized and emerging pathogens of E. lenta and E. aerogenes. Further, the physicochemical, morphological and biological properties of CuO NPs are discussed. [ABSTRACT FROM AUTHOR]

The aim of the present work is to investigate the change in thermal conductivity and stability of copper oxide (CuO) water-based nanofluids, which are prepared by a two-step process, with different concentrations of anionic (Sodium dodecyl sulfate SDS) and nonionic dispersants (Polyvinyl pyrrolidone PVP). Further, CuO nanofluids and nanoparticles have been characterized by XRD, EDX, FESEM, TEM, DLS, and UV to examine the particle size, elemental composition, morphology, particle size distribution, and band gap. Besides, thermal conductivity and stability of all the fluid samples have been measured with respect to particle volume fraction. The interpretation of particle stability in different weight percent of dispersants in base fluids in the presence of PVP dispersant results in a better stabilizing agent than SDS at higher particle volume fraction. Finally, evaluating the effect of lower dispersant concentration (0.1–0.5 wt%) and particle size on the thermal conductivity of CuO water-based nanofluids confirmed that the significant enhancement of thermal conductivity is observed at lower dispersant concentration and decreases with increase in particle size. The enhancement of thermal conductivity was found to be 38% and 34% at 0.4 wt% of SDS and PVP dispersants. [ABSTRACT FROM AUTHOR]

[Display omitted] • Synthesis of CuO Nps via solution combustion method using novel fuel (Chakkota or Pomelo fruit juice). • CuO nanoparticles shows a reversible capacity of 110 mA h g−1 is after 150 cycles at 0.1C current rate. • CuO nanoparticles exhibited better photocatalytic methylene blue dye degradation under visible light source. CuO nanoparticles (NPs) using Pamelo (Binomial name; Citrus maxima) fruit juice as fuel. XRD pattern confirms the monoclinic structure with C2/c point group. In FT-IR spectra peaks at 532 cm−1 is observed for symmetrical stretching vibrations of Cu-O bonds. The UV-DRS spectrum shows characteristic absorption band at 732 nm with corresponding bandgap of 1.62 eV. TEM images show agglomerated irregular shape of nanoparticles with an average particle size of about ~ 60 nm. BET analysis shows mesoporous nature having surface area of 3.7 nm. CuO NPs was examined as anode material for the Li-ion battery and it shows specific capacity at 110 mAh g−1 even after 150 cycles. CuO NPs showed excellent photocatalytic activity (82% in 150 min) against MB dye under visible light irradiation. [ABSTRACT FROM AUTHOR]