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您的检索式：作者名="Nadia Ismail"
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| 1 | Antimicrobial activity of latex silver nanoparticles using Calotropis procera显示文摘Objective:To synthesize silver nanoparticles(AgNPs) by green methods using scrum latex of Calotropis procera at 80 ℃ and evaluate them against bacteria,dermatophytes and phytopathogenic fungi comparing with the activity of untreated latex.Methods:The synthesis of AgNPs was performed by mixing 3%latex scrum extract with the same volume of silver nitrate(2 mmol/L) solution in round flask and heating in water bath at80 ℃.Characterization of silver particles were determined using UV-vis spectrophotometer,transmission electron microscopy(TEM),X-ray diffraction and Fourier transform infrared spectroscopy.The antimicrobial activity of the green synthesized AgNPs was determined against bacteria,dermatophytes and phytopathogenic fungi and compared to the crude untreated latex by agar-well diffusion methods.Results:Biosynthesis of latex silver nanoparticles was successfully obtained by green method.The formation of AgNPs has been confirmed by UV-vis,TEM microscopy.X-ray diffraction and Fourier transform infrared spectroscopy.TEM analysis showed that synthesized AgNPs are highly stable spherical shaped particles,well dispersed with a diameter ranged from 4 nm up to 25 nm and an average size of 12.33 nm.AgNPs showed strong antibacterial activity against Gram-negative bacteria(Escherichia coli,Pseudomonas aeruginosa and Serratia sp.) and antifungal activity against Trichophyton rubrum,Candida albicans and Aspergillus terreus.Conclusions:It can be concluded that serum latex of Calotropis pmcera was found to display strong potential for the synthesis of AgNPs as antimicrobial agents through rapid reduction of silver ions(Ag^+ to Ag^0).The green synthesized AgNPs were found to show higher antimicrobial efficacy than crude latex. | Nadia Hussein Mohamed Mady Ahmed Ismail Wael Moustfa Abdel-Mageed Ahmed Abdelfattah Mohamed Shoreit | 2014 | Asian Pacific Journal of Tropical Biomedicine2014，4，11： | 1 |
| 2 | Electrocatalytic acidic oxygen evolution reaction:From nanocrystals to single atoms显示文摘Hydrogen is the most preferred choice as an energy source to replace the nonrenewable energy resources such as fossil fuels due to its beneficial features of abundance,ecofriendly,and outstanding gravimetric energy density.Splitting water through a proton exchange membrane(PEM)electrolyzer is a well-known method of hydrogen production.But the major impediment is the sluggish kinetics of oxygen evolution reaction(OER).Currently,scientists are struggling to build out an acid-stable electrocatalyst for OER with low overpotential and excellent stability.In this review,the reaction mechanism and characterization parameters of OER are introduced,and then the improvement method of metal nanocatalysts(noble metal catalysts and noble metal-free catalysts)in acidic media is discussed.Particularly,the application of single-atom catalysts in acidic OER is summarized,which is current researching focus.At the same time,we also briefly introduced the cluster phenomenon,which is easy to occur in the preparation of single-atom catalysts.More importantly,we summarized the in situ characterization methods such as in situ X-ray absorption spectroscopy,in situ X-ray photoelectron spectroscopy,and so forth,which are conducive to further understanding of OER reaction intermediates and active sites.Finally,we put forward some opinions on the development of acidic OER. | Nadia Ismail Fengjuan Qin Chaohe Fang Dan Liu Bihan Liu Xiangyu Liu Zi-long Wu Zhuo Chen Wenxing Chen | 2021 | Aggregate2021，2，4： | 0 |
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