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- 저자 : Jayaweera (검색결과 3 건)
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Wijewardhana, K. Rohana,Shen, Tian-Zi,Jayaweera, E.N.,Shahzad, Amir,Song, Jang-Kun Elsevier 2018 Nano energy Vol.52 No.-
<P><B>Abstract</B></P> <P>Artificially embedded surface charges can dramatically improve the output energy of water–solid contact electrification devices, but the embedded charges easily escape or are cancelled out by adsorption of opponent ions in ambient conditions. Here, we demonstrate a hybrid energy harvesting nanogenerator by combing water–solid and solid–solid contact electrification schemes. It consists of a water–solid contact electrification device and wind-fluttering ribbons that regularly supplies triboelectric surface charges on the solid surface and hence, the high density of surface charges can remain on the surface. This scheme can enhance the harvesting energy by up to a factor of 30 during rain. Moreover, the fluttering ribbons independently collect electric energy from mild winds without rain. This scheme provides a facile, cost-effective, and robust approach to enhance the energy-harvesting efficiency of a water–solid contact electrification device and to combine the energy harvesting from simultaneous rain and wind.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hybrid nanogenerator combining an EDL device and triboelectric ribbons was demonstrated. </LI> <LI> The hybrid nanogenerator produces electricity in both rainy and windy conditions. </LI> <LI> Wind-driven ribbons provides triboelectric charges, producing 30-times more electricity. </LI> <LI> It provides a solution to enhance the electrification efficiency in water–solid nanogenerators. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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TiO<sub>2</sub> Nanoparticles from Baker’s Yeast: A Potent Antimicrobial
( Mmk Peiris ),( Tdcp Guansekera ),( Pm Jayaweera ),( Ssn Fernando ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.10
Titanium dioxide (TiO<sub>2</sub>) has wide applications in food, cosmetics, pharmaceuticals and manufacturing due to its many properties such as photocatalytic activity and stability. In this study, the biosynthesis of TiO<sub>2</sub> nanoparticles (NPs) was achieved by using Baker’s yeast. TiO<sub>2</sub> NPs were characterized by X-ray Diffraction (XRD), UV-Visible spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray analysis (EDX) studies. The XRD pattern confirmed the formation of pure anatase TiO<sub>2</sub> NPs. According to EDX data Ti, O, P and N were the key elements present in the sample. SEM and TEM revealed that the nanoparticles produced were spherical in shape with an average size of 6.7 ± 2.2 nm. The photocatalytic activity of TiO<sub>2</sub> NPs was studied by monitoring the degradation of methylene blue dye when treated with TiO<sub>2</sub> NPs. TiO<sub>2</sub> NPs were found to be highly photocatalytic comparable to commercially available 21 nm TiO<sub>2</sub> NPs. This study is the first report on antimicrobial study of yeast-mediated TiO<sub>2</sub> NPs synthesized using TiCl<sub>3</sub>. Antimicrobial activity of TiO<sub>2</sub> NPs was greater against selected Gram-positive bacteria and Candida albicans when compared to Gram-negative bacteria both in the presence or absence of sunlight exposure. TiO<sub>2</sub> NPs expressed a significant effect on microbial growth. The results indicate the significant physical properties and the impact of yeast-mediated TiO<sub>2</sub> NPs as a novel antimicrobial.
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Synthesis, Characterization and Antimicrobial Activity of Garcinol Capped Silver Nanoparticles
( H. N. Fernando ),( K. G. U. R. Kumarasinghe ),( T. D. C. P. Gunasekara ),( H. P. S. K. Wijekoon ),( E. M. A. K. Ekanayaka ),( S. P. Rajapaksha ),( S. S. N. Fernando ),( P. M. Jayaweera ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.11
Garcinol, a well-known medicinal phytochemical, was extracted and isolated from the dried fruit rinds of Garcinia quaesita Pierre. In this study, garcinol has successfully used to reduce silver ions to silver in order to synthesize garcinol-capped silver nanoparticles (G-AgNPs). The formation and the structure of G-AgNPs were confirmed by UV-visible spectroscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The antimicrobial activity of garcinol and G-AgNPs were investigated by well diffusion assays, broth micro-dilution assays and time-kill kinetics studies against five microbial species, including Staphylococcus aureus (ATCC 25923), Pseudomonas aeruginosa (ATCC 27853), Escherichia coli (ATCC 25922), Candida albicans (ATCC 10231) and clinically isolated methicillin-resistant Staphylococcus aureus (MRSA). The formation of G-AgNPs is a promising novel approach to enhancing the biological activeness of silver nanoparticles, and to increase the water solubility of garcinol which creates a broad range of therapeutic applications.
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