scholarly journals Electrochemical Study, Structural Characterization and Antimicrobial Activity of Silver and Copper Oxide (CuO) Nanoparticles Synthesized by a Green Method Using L-ascorbic Acid and Chitosan

2019 ◽  
pp. 6366-6375
Author(s):  
M E. Vázquez ◽  
Keyword(s):  
Antimicrobial Activity ◽  
Ascorbic Acid ◽  
Copper Oxide ◽  
Structural Characterization ◽  
Cuo Nanoparticles ◽  
Electrochemical Study ◽  
Green Method

scholarly journals Sintesis del óxido de cobre nanoestructurado asistida con irradiación gamma o ultrasonido y sus propiedades antimicrobianas

2019 ◽  
pp. 3-7
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Copper Oxide ◽  
Gamma Irradiation ◽  
Antimicrobial Properties ◽  
Ultrasound Irradiation ◽  
Cuo Nanoparticles ◽  
E Coli

Sintesis del óxido de cobre nanoestructurado asistida con irradiación gamma o ultrasonido y sus propiedades antimicrobianas Synthesis of nanostructured copper oxide assisted with Gamma or ultrasound irradiation and its antimicrobial properties Kety León, Alcides López, Javier Gago, José Solís División de Materiales, Dirección de Investigación y Desarrollo, Instituto Peruano de Energía Nuclear. Av Canadá 1470, San Borja Facultad de Ciencias, Universidad Nacional de Ingeniería. Av. Túpac Amaru 210, Rímac. DOI: https://doi.org/10.33017/RevECIPeru2011.0001/ RESUMEN Se han sintetizado nanopartículas de óxido de cobre (CuO) mediante irradiación gamma o ultrasonido. La actividad antimicrobiana de las nanopartículas de CuO se determinaron mediante el método de excavación en placa cultivo, con 3 cepas microbianas: Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922 y Pseudomonas aeruginosa ATCC 27853. La concentración bacteriana inicial fue 1x107 UFC / mL, y fueron sembradas sobre Agar Muller Hinton e incubadas a 37ºC por 24 h. Las nanopartículas de CuO obtenidas mediante ultrasonido son nanoesferas con una mayor actividad antimicrobiana para la bacteria S. aureus que para E. coli y sin actividad frente a P. aeruginosa; mientras que las nanopartículas de CuO obtenidas con radiación gamma con una dosis de 8 kGy tienen actividades antimicrobianas similares para S. aureus y E. coli y las obtenidas a dosis de 15 y 25 kGy solo tienen actividad antimicrobiana frente a E. coli. Descriptores: Nanopartículas, actividad antimicrobiana, sonoquímica, radiación gamma. ABSTRACT Copper oxide (CuO) nanoparticles have been synthesized using gamma irradiation or ultrasound. The antimicrobial activity of CuO nanoparticles was determined by excavation method in plate culture in three microbial strains: Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853. The initial bacterial concentration was 1x107 CFU / mL and seeded onto Muller Hinton Agar and incubated at 37 °C for 24 h. The CuO nanoparticles obtained by ultrasound are nanospheres with a higher antimicrobial activity for S. aureus than for E. coli and no activity against P. aeruginosa, while CuO nanoparticles obtained by gamma irradiation with a dose of 8 kGy have antimicrobial activity similar to S. aureus and E. coli and those obtained at doses of 15 and 25 kGy only have antimicrobial activity against E. coli. Keywords: Nanoparticles, antimicrobial activity, sonochemistry, gamma radiation.

scholarly journals Structural Analysis of Chemical and Green Synthesis of CuO Nanoparticles and their Effect on Biofilm Formation

2018 ◽  
Vol 15 (2) ◽  
pp. 211-216 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Copper Oxide ◽  
Biofilm Formation ◽  
Chemical Method ◽  
Copper Oxide Nanoparticles ◽  
Cuo Nanoparticles ◽  
Crystalline Size ◽  
Oxide Nanoparticles ◽  
Average Crystalline Size ◽  
Green Method ◽  
Cuo Nps

Copper oxide nanoparticles (CuO NPs) were synthesized by two methods. The first was chemical method by using copper nitrate Cu (NO3)2 and NaOH, while the second was green method by using Eucalyptus camaldulensis leaves extract and Cu (NO3)2. These methods easily give a large scale production of CuO nanoparticles. X-ray diffraction pattern (XRD) reveals single phase monoclinic structure. The average crystalline size of CuO NPs was measured and used by Scherrer equation which found 44.06nm from chemical method, while the average crystalline size was found from green method was 27.2nm. The morphology analysis using atomic force microscopy showed that the grain size for CuO NPs was synthesized by chemical and green methods were 77.70 and 89.24 nm, respectively. The effectiveness of copper oxide nanoparticles on bacteria was measured for both gram positive, negative and fungi, copper oxide minutes showed excellent efficacy on biofilm formation.

Synthesis, Physicochemical Characterizations and Antimicrobial Activity of CuO Nanoparticles

2018 ◽  
Vol 3 (2) ◽  
pp. 121-125
Author(s):  
Bhumika K. Sharma ◽  
Kinjal Patel ◽  
Debesh R. Roy
Keyword(s):  
Antimicrobial Activity ◽  
Cuo Nanoparticles

New frontiers in the plant extract mediated biosynthesis of copper oxide (CuO) nanoparticles and their potential applications: A review

2021 ◽  
pp. 111858
Author(s):  
Hoang Ngoc Cuong ◽  
Shreyas Pansambal ◽  
Suresh Ghotekar ◽  
Rajeshwari Oza ◽  
Nguyen Thi Thanh Hai ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Plant Extract ◽  
Cuo Nanoparticles ◽  
Potential Applications

Methods for Separation of Copper Oxide Nanoparticles From Colloidal Suspension in Dodecane

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Mohammed H. Sheikh ◽  
Muhammad A. R. Sharif
Keyword(s):  
Energy Storage ◽  
Copper Oxide ◽  
Phase Change ◽  
Phase Change Materials ◽  
Research Work ◽  
Cuo Nanoparticles ◽  
Health Hazards ◽  
Suspension Stability ◽  
Reduced Pressure

Phase change materials (PCM) are used in many energy storage applications. Energy is stored (latent heat of fusion) by melting the PCM and is released during resolidification. Dispersing highly conductive nanoparticles into the PCM enhances the effective thermal conductivity of the PCM, which in turn significantly improves the energy storage capability of the PCM. The resulting colloidal mixture with the nanoparticles in suspension is referred to as nanostructure enhanced phase change materials (NEPCM). A commonly used PCM for energy storage application is the family of paraffin (CnH2n+2). Mixing copper oxide (CuO) nanoparticles in the paraffin produces an effective and highly efficient NEPCM for energy storage. However, after long term application cycles, the efficiency of the NEPCM may deteriorate and it may need replacement with fresh supply. Disposal of the used NEPCM containing the nanoparticles is a matter of concern. Used NEPCM containing nanoparticles cannot be discarded directly into the environment because of various short term health hazards for humans and all living beings and unidentified long term environmental and health hazards due to nanoparticles. This problem will be considerable when widespread use of NEPCM will be practiced. It is thus important to develop technologies to separate the nanoparticles before the disposal of the NEPCM. The primary objective of this research work is to develop methods for the separation and reclamation of the nanoparticles from the NEPCM before its disposal. The goal is to find, design, test, and evaluate separation methods which are simple, safe, and economical. The specific NEPCM considered in this study is a colloidal mixture of dodecane (C12H26) and CuO nanoparticles (1–5% mass fraction and 5–15 nm size distribution). The nanoparticles are coated with a surfactant or stabilizing ligands for suspension stability in the mixture for a long period of time. Various methods for separating the nanoparticles from the NEPCM are explored. The identified methods include: (i) distillation under atmospheric and reduced pressure, (ii) mixing with alcohol mixture solvent, and (iii) high speed centrifugation. These different nanoparticle separation methods have been pursued and tested, and the results are analyzed and presented in this article.

Structural Characterization and Electrochemical Study of Novel Ferrocene Derivatives Prepared from [(β-Ferrocenylvinyl)imino]phosphorane by Aza Wittig Reactions

1997 ◽  
Vol 16 (26) ◽  
pp. 5836-5843 ◽  
Author(s):  
Pedro Molina ◽  
Aurelia Pastor ◽  
M. Jesús Vilaplana ◽  
M. Desamparados Velasco ◽  
M. Carmen Ramirez de Arellano
Keyword(s):  
Structural Characterization ◽  
Electrochemical Study ◽  
Ferrocene Derivatives ◽  
Wittig Reactions

scholarly journals Green Synthesis, Characterization and Antibacterial Activity of Copper Oxide Nanoparticles Using Annona muricata Stem Extract

2021 ◽  
Vol 9 (12) ◽  
pp. 1205-1214
Author(s):  
Shivani Kushwaha
Keyword(s):  
Antibacterial Activity ◽  
Copper Oxide ◽  
Copper Sulphate ◽  
Copper Oxide Nanoparticles ◽  
Maximum Activity ◽  
Cuo Nanoparticles ◽  
Oxide Nanoparticles ◽  
Gradual Change ◽  
Annona Muricata ◽  
Stem Extract

Abstract: Nanotechnology is a rising field of science and technology that deals with the particles having size in the range of 1 to 100 nm. Copper oxide nanoparticles has many properties like antifungal activity, antibacterial activity, optical properties, conductive properties, etc. Due to its demand of diversified use, copper oxide nanoparticles were fabricated using ecofriendly and non-toxic Annona muricata stem extract. The extract with copper sulphate pentahydrate showed gradual change in the colour of the extract from brown to green which indicates the CuO nanoparticles synthesis. The fabrication is followed by characterization of CuO nanoparticles using UV-vis spectroscope, FTIR, XRD and SEM. The characterization showed roughly spherical shaped nanoparticles in the range of 100nm with high crystalline monoclinic phase. FTIR absorption spectra conclude that the compounds attached with copper oxide nanoparticles could be polyphenols with aromatic ring. The CuO nanoparticles exhibited antibacterial activity; it showed the maximum activity against E.coli (18 mm). Keywords: Annona muricata, copper sulphate pentahydrate, FTIR, nanomaterials, SEM, XRD.

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