{"title":"Zinc Nanoparticles: an Investigation of Deleterious Effect on Micro-Organisms","authors":"R. Singaravelan","doi":"10.19080/gjn.2017.01.555569","DOIUrl":"https://doi.org/10.19080/gjn.2017.01.555569","url":null,"abstract":"The work investigates the synergistic effect of zinc nanoparticles (Zn NPs) against different multi-drug resistant (MDR) gram-positive and gram-negative bacteria. The Zn NPs obtained by the electro deposition process exhibited a very high antibacterial effect with minimum inhibitory concentration of 50μg/ml on both gram positive and gram negative bacteria. Zeta potential measurements were carried out to study the effect of Zn NPs on the membrane surface potential. The negative surface potential of Zn NPs was very effective against gram negative bacterium comparing to gram positive bacterium. Studies on optical properties of the Zn NPs were carried-out by UV-Vis diffuse reflectance spectroscopy (UV-DRS). Surface plasma on peak in absorption spectra of Zn NPs exposed significant blue shift indicating the small particle size. Optical band-gap of the Zn NPs has been calculated using the Kubelka-Munk function and the band gap value being 2.8 eV. The high resolution scanning electron microscope (HR-SEM) characterizations revealed the hexagonal surface morphology of the Zn NPs. The purity of the synthesized Zn NPs was confirmed by the Fourier transform infrared spectroscopy (FT-IR) and the spectrum showed a functional group free bands indicating high degree of purity of Zn NPs.","PeriodicalId":427673,"journal":{"name":"Global Journal of Nanomedicine","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126564477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"MgO nanostructures: Formation and Antibacterial Activity","authors":"M. Malla, M. Shah","doi":"10.19080/gjn.2017.01.555566","DOIUrl":"https://doi.org/10.19080/gjn.2017.01.555566","url":null,"abstract":"An improved and non toxic way for the preparation of magnesium oxide (MgO) nanostructures having size range of 60 ± 15nms has been established at very low temperature of ~ 125°C. The formation of nano particles by the reaction of metals with water is suggested to occur due of decomposition of water by the metal giving hydrogen. The approach described can potentially eliminate the problem by making nano particles non toxic and biocompatible. Bactericidal experiments with gram positive and gram negative were carried out using as synthesized MgO nano particles and their bactericidal mechanism was investigated.","PeriodicalId":427673,"journal":{"name":"Global Journal of Nanomedicine","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127822389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Second Law Analyses of Forced Convection of Low-Reynolds-Number Slip Flow of Nanofluid Inside a Microchannel with Square Impediments","authors":"M. Abbaszadeh","doi":"10.19080/gjn.2017.01.555567","DOIUrl":"https://doi.org/10.19080/gjn.2017.01.555567","url":null,"abstract":"In this study, the Finite Volume Method is employed in order to investigate the flow field, heat transfer and entropy generation of forced convection of Al2O3-water nanofluid in a parallel plate microchannel. Four square impediments are placed inside the microchannel to enhance mixing of nanofluid. The governing equations, which are accompanied with the slip velocity and temperature jump boundary conditions, are solved by SIMPLER algorithm. The study is conducted for the Reynolds numbers in the range of 0.1 ≤ Re ≤ 10, Knudsen numbers ranging of 0 ≤ Kn ≤ 0.1 and volume fraction of nanoparticles ranging of 0 ≤ φ ≤ 3%. The results show that by increasing the volume fraction of nanoparticles or the Reynolds number, the average Nusselt number and the total entropy generation augment. Furthermore, as the Knudsen number increases, both the average Nusselt number and the total entropy generation rate decrease.","PeriodicalId":427673,"journal":{"name":"Global Journal of Nanomedicine","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116205195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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