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Ionic Liquids Assisted Synthesis of ZnO Nanostructures:Controlled Size,morphology and Antibacterial Properties

Journal of materials Science & Technology 2013年第6期29卷 533-538页

作者： R.Rajiv Gandhi S.Gowri J.Suresh m.sundrarajan Advanced Green Chemistry Lab Department of Industrial ChemistrySchool of Chemical SciencesAlagappa UniversityKaraikudi 3Tamil NaduIndia

Systematic analysis about the exploitation of imidazolium based ionic liquids （ILs）, [BmIm] BF4 [ILl], [EmIm] BF4 ILL2] and [BmIm] PF6 [IL3] as the morphological template on the basic sol-gel method adopted synthesis of nanostructured zinc oxide （ZnO） is presented. X-ray diffraction （XRD）, particle size analysis （PSA） and scanning electron microscopy （SEm） have been employed for the characterization of structure and morphology of the synthesized ZnO particles. Well-defined capsule like shaped morphology with lower nanosize is observed for the ZnO nanoparticles with ILl than those with IL2 and IL3. This confirms that ILl served as an effective templating material due to their unique properties. Especially the effective aggregation of ZnO particles with a self-organized frame of ILl was the essential factor to produce the lower nanosized ZnO with capsule shaped structure. The synthesized ZnO samples with IL2 and IL3 fabricated the flake like shaped and rod like shaped morphologies in the range of nanoscale. The formed ZnO nanoparticles with IL2 exhibit higher nanosize than the ZnO nanoparticles produced by ILl, owing to shorter length of alkyl group in its cation which restricts steric effect and permits the nanoparticles to grow longer. Even though IL3 produced the discrete ZnO nanorods, the hydrophobic nature of IL3 created the higher nanosize than the ZnO nanoparticles formed by other two ionic liquids. Antibacterial properties of the synthesized ZnO nanostructures were investigated against Staphylococcus aureus （gram positive） and Escherichia coil （gram negative） bacteria by Agar diffusion test method. microbial experiments indicate that the synthesized ZnO samples show a wide spectrum of antimicrobial activities and performed better against S. aureus than E. coil with the same concentration of ZnO.

关键词： Zinc oxide Ionic liquids Sol-gel method Antibacterial activity

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Structural,Optical,Antibacterial and Antifungal Properties of Zirconia Nanoparticles by Biobased Protocol

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Journal of materials Science & Technology 2014年第8期30卷 782-790页

作者： S. Gowri R. Rajiv Ganhi m. sundrarajan Advanced Green Chemistry Lab Department of Industrial ChemistrySchool of Chemical SciencesAlagappa University

Biological entities and inorganic materials have been in constant touch with each other ever since inception of life on *** method has lots of merits such as not requiring complex procedures,template supporting *** this work,Aloe vera plant mediated synthesis of tetragonal zirconia nanoparticles has been performed and thermogravimetric and differential thermal analysis（TG/DTA）,X-ray diffraction（XRD）,scanning electron microscopy（SEm） with energy dispersive X-ray spectroscopy（EDX）,atomic force microscopy（AFm）,ultraviolet—visible（UV—VIS） technique and Fourier transform infrared spectroscopy（FTIR） have been provided for characterizing the *** of homogeneously distributed spherical zirconia nanoparticles of 50—100 nm in size is *** antimicrobial and antifungal properties are also investigated for synthesis of zirconia nanoparticles and the treated cotton by agar diffusion method against Staphylococcus aureus and Escherichia coli bacterial pathogens and fungal strains Candida albicans and Aspergillus niger,respectively.

关键词： Zirconia nanoparticles Biosynthesis Aloe vera Cotton Antibacterial property

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