Samayanan Selvam

Antibacterial effect of novel synthesized sulfated β-cyclodextrin crosslinked cotton fabric and its improved antibacterial activities with ZnO, TiO2 and Ag nanoparticles coating

Sulfated β-cyclodextrin was synthesized from sulfonation of β-cyclodextrin and sulfated polymer was crosslinked with cotton fabric using ethylenediaminetetraacetic acid as crosslinker. ZnO, TiO(2) and Ag nanoparticles were prepared and characterized by XRD, UV, DLS, SEM and PSA. The prepared nanoparticles were coated on crosslinked cotton fabric. The crosslinking and nanoparticles coating effects of cotton fabrics were studied by FTIR and SEM analysis. The antibacterial test was done against gram positive Staphylococcus aureus and gram negative Escherichia coli bacterium.

Synthesis of Magnesium Oxide Nanoparticles by Wet Chemical Method and its Antibacterial Activity

Wet chemical method was applied to prepare magnesium oxide nanoparticles using magnesium nitrate and sodium hydroxide as precursors in presence of starch as stabilizing agent. The XRD analysis of MgO nanoparticles showed the average particles size of crystallite as 12nm. SEM images also proved the crystalline nature of MgO nanoparticles. Antibacterial studies were done on gram positive (S. aureus) and gram negative (E.coli) bacteria using the above prepared nanoparticles by agar diffusion method. The zone of inhibition was found to more in S.aureus compared to E.coli. Since this method of preparation produced better yield in simple and cost effective way, it can be applied for large scale preparation of magnesium oxide nanoparticles.

Preparation and Characterization of Nano-size Polyreactive Blue MXR

Nanosize Polyreactive blue MXR dye was synthesized from reactive blue MXR dye in presence of potassium persulfate as catalyst. The formation of polyreactive blue MXR was indicated by colour change from blue to brown. The characterization techniques such as, Fourier transform infrared spectroscopy (FTIR), Atomic force microscopy (AFM), and X-ray diffractrometry (XRD) were used to characterize the formation of nanosize polyreactive blue MXR. The absence of asymmetric stretching of NH2 group in polymer dye FTIR spectrum confirmed the polymerization of dye was occurring. The average particle size of the polymer dye was found to be 18.11 nm according to Scherer formula.AFM analysis shows the three dimensional structure of polyreactive blue MXR.