In this study, magnetite nanoparticles (Fe3O4 NPs) and Chitosan coated Fe3O4 nanocomposites (CS-Fe3O4 NCs) were synthesized by simple co-precipitation method under air atmosphere. The structure, Functional, morphology
and magnetic property of synthesized samples have been analyzed. X-ray diffraction results confirmed NPs and CS-Fe3O4 Fe3O4 NCs were composed of pure magnetite and the peak positions were unchanged after the introduction of CS biopolymer. The FTIR
studies authenticate the bonding of the CS polymer with Fe3O4 NPs. The morphological studies revealed that the nanoparticles are almost spherical in size. Magnetization curves showed both Fe3O4 NPs and CS-Fe3O4 NCs were near
to superparamagnetic. In addition, the antimicrobial efficacy of CS-Fe3O4 NCs were found out by using viable cell-counting method against Gram positive bacterial strain Staphylococcus aureus MTCC 3160 (S. aureus). The results proved that synergistic antibacterial
effects by combining CS with Fe3O4 NPs which may have the potential to be used in combating bacterial infections.
The biocompatible Chitosan/Zinc oxide (CS/ZnO) nanocomposites (NCs) material was synthesized via a simple and versatile microwave assisted wet synthesis method. After the incorporation of CS in the ZnO nanoparticles (NPs), the crystalline structure of the modified NPs was retained in
the NCs and it was clearly exposed in the X-ray diffraction (XRD) measurements. The Zeta potential measurement of CS/ZnO nanocomposites (NCs) shows more stability than ZnO NPs. The Field Emission Scanning Electron Microscopy (FE-SEM) measurements depict the formation of cauliflower like structure
after the integration of CS in the ZnO NPs. The interaction between ZnO molecules in CS becomes more compact and is confirmed in the Fourier Transform Infrared Spectroscopy (FTIR) measurement. Bacterial activity was increased gradually with the CS/ZnO content and was analytically stronger
against Gram-positive cells. This study has conclusively proved that reactive oxygen species (ROS) such as •OH, •O2− , and H2O2 were significantly produced from aqueous suspension of CS/ZnO and were primarily responsible
for the bactericidal activity.
Microwave assisted co-precipitation method is used to synthesize copper oxide nanoparticles from various concentrations of CuCl 2 .2H 2 O (0.1 M -0.5 M) precursors. Both CuO and Cu 2 O phases are observed from X-ray diffraction (XRD) pattern and further confirmed from Energy Dispersive X-ray Analysis (EDX) and selected area electron diffraction (SAED) data. The particle size of 43 to 27 nm determined from XRD data using Scherrer formula is in good relation with Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) images. The existence of reasonably uniform size and shape is clear from SEM. The band gaps determined from the UV-Visible absorption peaks and vibrational modes observed from Micro-Raman Scattering (MRS) analysis further confirm the presence of CuO and Cu 2 O phases. These results are also related to electrical conductivity at low temperatures which illustrate different types of conduction mechanisms. The samples show semiconducting behavior with improved electrical conductivity. Finally, the material is proposed to have applications in designing gas sensors and also in regulating electrical conductivity in drug delivery systems.
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