Silver nanoparticles (AgNPs) synthesized by an implicitly environmentally gracious route using Acanthospermum hispidum aqueous leaves extract at room temperature reported. This approach is facile, swift, cost-effective and stable for a long time, reproducible at room temperature and in an eco-friendly manner to obtain a self-assembly of AgNPs. These fabricated AgNPs were investigated by ultraviolet-visible spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscope with selected area electron diffraction, X-ray diffraction, Fourier transform Infrared spectroscopy, particle size, zeta potential, photoluminescence with fluorescence lifetime spectroscopy and surface area with porosity studies of synthesized nanoparticles were analyzed by Brunauer-Emmett-Teller and Barrett-Joyner-Halenda curve. Besides, these AgNPs displayed antibacterial, antifungal antimycobacterial and antimalarial activity against some bacterial pathogens. From the outcomes obtained it is suggested that AgNPs could be used effectively in future nanobiotechnology and medical concerns.
A highly efficient, eco‐friendly, recyclable heterogeneous ZnFe2O4 nanocatalyzed synthesis of 2‐amino‐4‐substituted 1,4‐dihydrobenzo[4,5]imidazo[1,2‐a]pyrimidine‐3‐carbonitrile (4a‐j) derivatives via one pot multicomponent reaction of benzimidazole (1), substituted aromatic aldehyde (2a‐j) and malononitrile (3) under ultrasonic irradiations. Significance of this synthetic approach is short reaction time, easy handling, simplicity, efficiency, high yield, and recoverable catalyst.
In this study, spinel zinc chromite nanorods (ZnCr
2
O
4
NRs) were successfully manipulated by a simple sol-gel auto combustion process employing urea as fuel. The sample was only required to sinter at 500 °C for 2 h to obtain the single crystalline phase. The phase formation, crystallinity, and surface topography of synthesized ZnCr
2
O
4
NRs were explored by X-ray diffraction (XRD), UV-Vis reflectance spectroscopy (UVDRS), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray (EDX) spectroscopy, and vibrating sample magnetometry (VSM). XRD analysis confirms the formation of spinel ZnCr
2
O
4
NRs. The FTIR spectrum displays the two vibrational peaks of Cr–O, and Zn–O at 489 and 615 cm
–1
, correspondingly. These vibrational bonds were correlated with ZnCr
2
O
4
and revealed the production of cubic spinel ZnCr
2
O
4
NRs. FESEM indicates the presence of hexagonal-rod-shaped particles. EDX spectrum demonstrates the elemental composition of the ZnCr
2
O
4
NRs and confirms the primary peak of Zn, Cr, and O. The obtained ZnCr
2
O
4
NRs exhibit an antiferromagnetic behavior. The bandgap energy of ZnCr
2
O
4
NRs was ascertained and was shown to be 3.45 eV. Furthermore, the antifungal and antibacterial effect of ZnCr
2
O
4
NRs was examined against pathogenic strains by disc diffusion technique. Besides these, the antimalarial activity of ZnCr
2
O
4
NRs was studied against
Plasmodium falciparum
. Thus, the as-synthesized ZnCr
2
O
4
NRs showed significant antibacterial, antifungal and antimalarial activity and may be helpful for research opening a novel horizon in nanomedicine.
Graphical abstract
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