Sintering Behavior of Copper Nanoparticles

Yu, En-Kyul; Piao, Longhai; Kim, Sang-Ho

doi:10.5012/bkcs.2011.32.11.4099

Cited by 18 publications

(12 citation statements)

References 17 publications

(16 reference statements)

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“…In these cases, a strongest peak of each copper oxide appears around 36 o (Cu 2 O) and 38 o (CuO) in XRD patterns. 28,29 Our obtained results confirm that the prepared CuNPs are high purity. The colloidal solution didn't change color after one month without storage in any inner gas (Image not shown here).…”

Section: 25supporting

confidence: 78%

Ultrafine Copper Nanoparticles Exhibiting a Powerful Antifungal/Killing Activity Against Corticium Salmonicolor

Cao¹,

Nguyen²,

Vo³

et al. 2014

Bulletin of the Korean Chemical Society

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In this paper ultrafine copper nanoparticles (CuNPs) were prepared from copper salt via chemical reduction method with sodium citrate dispersant and polyvinylalcol (PVA) capping polymer. The colloidal CuNPs were characterized by using UV-Visible spectroscopy, Transmission Electron Microscopy (TEM), and X-ray Diffraction (XRD) techniques. Our obtained results indicated that the CuNPs were produced ranging from 2 to 4 nm in diameter. The colloidal solution at 7 ppm of CuNPs exhibited a powerful antifungal activity against Corticium salmonicolor (C. Salmonicolor). Fungal killing assays showed colloid solutions containing 10 ppm of CuNPs killed entirely the cultured fungus. A highly killing activity against the fungus was also performed when the CuNPs were sprayed on pink disease-infected rubber trees. These positive results may offer a great potential to produce CuNPs-based eco-fungicide for pink disease.

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Section: 25supporting

confidence: 78%

Ultrafine Copper Nanoparticles Exhibiting a Powerful Antifungal/Killing Activity Against Corticium Salmonicolor

Cao¹,

Nguyen²,

Vo³

et al. 2014

Bulletin of the Korean Chemical Society

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“…When a cell-free extract of Pseudomonas fluorescens MAL2 was added to CuSO4•5H2O solution in the growing flasks and left for incubation for 48 h, the reaction mixtures color changed from blue to heavy green ( Figure 5A), proving the biotransformation of CuNPs. The analogous appearance of a dark green color solution due to the addition of 5 mM CuSO4 to a flask comprising Morganella sp., indicated CuNPs biotransformation [47,48]. When different concentrations of CuSO4•5H2O solutions were added to the pellet, no color change occurred ( Figure 5B).…”

Section: Uv-vis Analysis Of Cunps Biosynthesismentioning

confidence: 97%

Ecofriendly Synthesis and Insecticidal Application of Copper Nanoparticles against the Storage Pest Tribolium castaneum

et al. 2020

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In spite of great developments in the agricultural field and plant productivity in the last decades, the concern about the control of agricultural pests is still continuous. However, pest management is expected to have more effects from nanomaterials by providing innovative solutions. The current study confirms the biotransformation of copper nanoparticles (CuNPs) using a cell-free culture extract of metal copper-resistant bacteria Pseudomonas fluorescens MAL2, which was isolated from heavy metal-contaminated soils collected from Sharqia Governorate, Egypt. The local screened bacterial isolate, Pseudomonas fluorescens MAL2, is similar to Pseudomonas fluorescens DSM 12442T DSM. After optimization of growth conditions, F-Base medium was found to be the best medium and pH 7, temperature 35 °C, concentration of CuSO4·5H2O 300 ppm, 10 mL supernatant: 40 mL CuSO4·5H2O (300 ppm), and reaction time 90 min were recorded as the best growth conditions to the fabrication of CuNPs. The formed CuNPs were characterized using initially visual observation of the change in the color of the reaction mixture from blue color to the dark green as an indication of CuNPs biotransformation. Then, UV–Vis spectroscopy showed a maximum absorption at 610 nm under the optimum conditions performed. Transmission Electron Microscopy (TEM) revealed the formation of spherical aspect with size ranges from 10:70 nm; moreover, Energy Dispersive X-ray spectroscopy (EDX) indicated the presence of CuNPs and other elements. In addition, the presence of alcohols, phenols, alkenes, and amines is confirmed by Fourier-Transform Infrared spectroscopy (FTIR) spectroscopy analysis. Dynamic Light Scattering (DLS) supported that the Zeta-average size of nanoparticle was 48.07 with 0.227 PdI value. The Zeta potential showed −26.00mV with a single peak. The biosynthesized CuNPs (Bio CuNPs) showed toxicity against the stored grain pest (Tribolium castaneum), where LC50 value was 37 ppm after 5 days of treatment. However, the negligible effect was observed with chemical synthesis of CuNPs (Ch CuNPs) at the same concentration. The results suggest that Bio CuNPs could be used not only as a biocontrol agent, but also as an ecofriendly and inexpensive approach for controlling the stored grain pests.

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“…The density increase can probably be attributed to low-temperature sintering of copper nanoparticles as copper has a lower melting temperature than iron. The eff ect of low-temperature sintering and melting of nanoparticles is well-known [29,30] and is attributed to their surface energy [31] which is determined by a high density of defects and the curvatures of nanoparticles surface [32]. It is also shown in Ref.…”

Section: Resultsmentioning

confidence: 94%

The formation of Fe Cu composite based on bimetallic nanoparticles

Ложкомоев

Лернер

Первиков

et al. 2019

Vacuum

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In this paper we suggest a new method of producing a Fe-28 wt% Cu composite by compacting and subsequent sintering of bimetallic nanoparticles made of metals with limited mutual miscibility: iron and copper. The influence of the temperature of annealing on the structure and phase composition of consolidated composite samples has been analyzed. It has been shown that annealing in the temperature range of 200-400 °C induces the processes of low-temperature sintering of copper and iron. These processes are accompanied by the growth of the size of coherent scattering regions and the separation of the metallic components of nanoparticles. During thermal treatment in the range between 400 and 600 °C, adjacent sidewalls of large particles are welded together and large pores emerge in the sample. Further temperature increases cause the sample to shrink and the pores to become smaller. The consolidation of bimetallic nanoparticles consisting of iron and copper and their subsequent sintering allows for obtaining volumetric composites that have homogeneous structure without distinct macroscopic separation of phases as well as high strength characteristics.

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Sintering Behavior of Copper Nanoparticles

Cited by 18 publications

References 17 publications

Ultrafine Copper Nanoparticles Exhibiting a Powerful Antifungal/Killing Activity Against Corticium Salmonicolor

Ultrafine Copper Nanoparticles Exhibiting a Powerful Antifungal/Killing Activity Against Corticium Salmonicolor

Ecofriendly Synthesis and Insecticidal Application of Copper Nanoparticles against the Storage Pest Tribolium castaneum

The formation of Fe Cu composite based on bimetallic nanoparticles

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