Abstract-

Cu2O-Cu nanoparticles (Cu2O-Cu NPs) stabilized by alginate have been developed for using as a plant fungicide. The antifungal effect of Cu2O-Cu NPs against Neoscytalidium dimidiatum fungus causing brown spot disease in dragon fruit plants was investigated. Transmission electron microscopy (TEM) was used to assess the morphology and size of Cu2O-CuNPs. The average diameter of spherical Cu2O-Cu NPswas determined to be 5.40.4 nm. Furthermore, the Cu2O-CuNPs stabilized in alginate were also characterized by Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) analysis. Especially, the prepared Cu2O-Cu NPs/alginate showed high antifungal efficiency (~100 %) against Neoscytalidium dimidiatum with 30 ppm concentration copper. The obtained results showed that Cu2O-Cu NPs stabilized in alginate have great potential in the development of nanomaterials for plant fungicide applications.

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This work presented the results of the study on synthesis and characterization of nanosilica from rice husk ash (RHA). Nanosilica was obtained by calcination of HCl treated RHA at 700 o C for 2 h. X-ray diffraction (XRD) pattern showed only one peak at 2 ~22 o confirming the amorphous structure of nanosilica. The chemical composition assessed by energy dispersive X-ray spectroscopy (EDX) showed that the obtained nanosilica was of high purity. TEM image measured by transmission electron microscopy (TEM) revealed that the obtained nanosilica was in spherical morphology with the average diameter of about 45.5±7.2 nm. The particle size distribution of nanosilica determined by dynamic laser scattering (DLS) was of Gaussian mode. The FTIR spectrum indicated the presence of silanol and siloxane groups in nanosilica. Thus, the synthesized nanosilica can be used for application in different fields.

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