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Synthesis and characterization of lanthanum-doped curcumin-functionalized antimicrobial copper oxide nanoparticles

Journal of Rare Earths 2023年第10期41卷 1606-1615,I0005页

作者： Sai Varshith Chakka Naveen Thanjavur Sunmi Lee Sanghyo Kim Department of Bionanotechnology Gachon UniversitySeongnam13120South Korea Department of Virology Sri Venkateswara UniversityTirupati517502India Department of K-beauty business Daegu Haany UniversityKyungsan42158South Korea

Flavonoid-based nanomaterials have extensive potential in antimicrobial research because of their non-toxicity,large-scale producibility,and chemical *** efficient combination of flavonoids and rare earth metals can have excellent antimicrobial properties owing to their robust medicinal and physicochemical *** this study,we synthesized copper oxide(CuO)nanoparticles(NPs)using a reflux reaction and repeated doping with the rare earth element lanthanum to prepare La-CuO ***,these La-CuO NPs were functionalized with the flavonoid curcumin,and the modified NPs were termed Cu-La-CuO *** NPs were chemically characterized via microscopic and spectroscopic techniques,including transmission electron microscopy(TEM),scanning electron microscopy(SEM),ultraviolet-visible(UV-Vis)adsorption,Fourier transform infrared spectroscopy(FT-IR)spectroscopy,and powder X-ray diffraction(XRD)*** SEM-EDX analysis reveals the elements doped into the native CuO *** TEM and XRD characterization results show,in detail,the distinct morphology and phase composition of the prepared CuO,La-CuO,and Cu-La-CuO *** antimicrobial activity of the Cu-La-CuO NPs was investigated on bacteria,such as Escherichia coli(***)and Bacillus subtilis(***),and fungi,including Aspergillus niger(A niger).The Cu-La-CuO NPs delivers excellent antimicrobial effects due to the incorporation of lanthanum and curcumin into the CuO *** Cu-La-CuO NPs show excellent antimicrobial potentials with an adequate zone of inhibition values around 2.2 and 2.9 mm in *** and ***,*** and dead analysis studies suggest the antimicrobial effects of lanthanum and curcumin moieties over native CuO *** obtained results are significant in developing of rare earth metal-based flavo no id-conjugated nanocomposites against typical microbes.

关键词： copper oxide nanoparticles Reflux reaction Curcumin Antimicrobial activity Cu-La-CuO NPs Rare earths

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Experimental Investigation of Upgraded Diesel Fuel with copper oxide nanoparticles on Performance and Emissions Characteristics of Diesel Engine

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Journal of Energy and Power Engineering 2017年第8期11卷 541-552页

作者： Sherry Khulief Tarek M. Aboul-Fotouh Department of Chemical Engineering Faculty of Engineering the British University in Egypt (BUE) El-Shorouq City Cairo 11837 Egypt Mining and Petroleum Engineering Department Faculty of Engineering Al-Azhar University Nasr City Cairo 11884 Egypt

The enhancement of the physicochemical characteristics of fossil fuel has been the subject of extensive research to achieve better efficiency and reduced emissions. Diesel is one of the fossil fuels that are highly consumed in daily life. This paper focuses on the behavior of a refined diesel fuel when copper oxide nanoparticles are added. The resulting blend ofnano-diesel has been analyzed using a four-stroke engine under two loads indicating light vehicles and heavy duty vehicles. The nano-diesel was prepared by the aid of an ultrasonicator and a mechanical homogenizer. A base diesel was taken as a reference to distinguish the effect of the nanoparticles additives. Three different samples with different concentrations are utilized in this study. As a result, the fuel consumption, exhaust temperature, brake power, power losses and engine efficiency have been evaluated and compared to the base diesel in order to demonstrate and access the enhanced performance of the nano-fuel blend. The three concentrations conducted were 100 ppm, 200 ppm and 300 ppm of copper oxide nanoparticles. The results represented that the pure refinery diesel has low exhaust temperatures, high brake power and high efficiency as compared to the commercial diesel supplied from a gas station. In addition, 300 ppm copper oxide nano-diesel showed improvement in engine performances as compared to the other concentrations and pure diesel. In this context, lowest fuel consumption for both passenger cars and heavy duty vehicles was achieved, brake power for passenger cars only was improved and input power showed improvement however, exhaust temperature was the highest as for this fuel.

关键词： Diesel fuel copper oxide nanoparticles bio-diesel additives.

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Effect of Nanomaterials Addition to Phase Change Materials on Heat Transfer in Solar Panels under Iraqi Atmospheric Conditions

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Frontiers in Heat and Mass Transfer 2023年第1期21卷 215-226页

作者： Majid Ahmed Mohammed Abdullah Talab Derea Mohammed Yaseen Lafta Obed Majeed Ali Omar Rafae Alomar Department of Power Mechanics Haweja Technical InstituteNorthern Technical UniversityKirkuk36001Iraq Department of Reconstruction and Projects Ministry of Higher Education and Scientific ResearchBaghdad10065Iraq Department of Physics College of EducationAl-Iraqia UniversityBaghdad10053Iraq Engineering Technical College of Mosul Northern Technical UniversityMosul41002Iraq

It is common knowledge that phase-change materials are used for the purpose of thermal storage because of the characteristics that are exclusive to these materials and not found in *** characteristics include a large capacity for absorbing heat and a large capacity for releasing heat when the phase changes;however,these materials have a low thermal *** paper presents the results of an experimental study that investigated the impact that nanoparticles of copper oxide had on reducing the temperature of solar *** phase change substance that was used was determined to be *** impact of adding nanoscale copper oxide at a concentration of 0.05%of the total mass of wax was investigated and compared to a reference solar panel that did not contain any nanoscale *** findings demonstrated that the incorporation of nanoscale copper oxide brought about a reduction of three℃ in the plate’s average temperature as well as a one percent improvement in its electrical *** cases where it seems that the use of nanoparticles might potentially enhance the performance of integrated solar energy systems that contain phase change.

关键词： copper oxide nanoparticles nanoparticle beeswax thermal conductivity phase-change materials

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