Sintering of nanocrystalline materials: Sintering parameters

Babalola, Bukola Joseph; Ayodele, Olusoji Oluremi; Olubambi, Peter Apata

doi:10.1016/j.heliyon.2023.e14070

Cited by 17 publications

(11 citation statements)

References 90 publications

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“…Furthermore, unexpected sintering is observed in Figure 4B after exposure to heat. Sintering involves joining nanoparticles into a solid mass due to temperatures less than 250 • C, pressure, and leftover alcohols during evaporation [31]. As such, during both synthesis and drying, the CuNPs undergo sintering, and the well-connected features are observed in Figure 4B.…”

Section: The Morphology Of the Synthesized Nanoparticles Using Scanni...mentioning

confidence: 99%

“…As such, during both synthesis and drying, the CuNPs undergo sintering, and the well-connected features are observed in Figure 4B. Sintering techniques have been standardized to produce chemically synthesized CuNPs for copper inks used in conductivity [31,32]. Yet, no work has been reported employing a sintering temperature as low as 60 • C for CuNPs from Lannea discolor extracts.…”

Section: The Morphology Of the Synthesized Nanoparticles Using Scanni...mentioning

confidence: 99%

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Green Synthesis of Gold and Copper Nanoparticles by Lannea discolor: Characterization and Antibacterial Activity

Rambau,

Masevhe,

Samie

2024

Inorganics

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Green synthesis using plant extracts has emerged as an eco-friendly, clean, and viable alternative to chemical and physical approaches. Herein, the leaf, stem, and root extracts of Lannea discolor were utilized as a reducing and stabilizing agent in synthesizing gold (AuNPs) and copper (CuNPs) nanoparticles. The formation of AuNPs and CuNPs, confirmed by their color change, was characterized by UV-Vis spectroscopy (UV-Vis), scanning electron microscopy analysis, and energy-dispersive X-ray (SEM-EDX), transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FTIR), coupled with minimum inhibitory concentration (MIC) antibacterial assays. Gold nanoflowers (AuNFs), NPs, and CuNPs peaked at wavelengths of 316, 544, and 564 nm, respectively. TEM showed unexpected nanoflowers (30–97 nm) in the leaf extracts and spherical NPs (10–33 nm; 9.3–37.5) from stem and root extracts, while spherical CuNPs (20–104 nm) were observed from all the extracts. EDX confirmed the presence of metal salts, and FTIR revealed stable capping agents. AuNPs and NFs from L. discolor extracts showed appreciable antibacterial activity against Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853), Klebsiella pneumoniae (ATCC 700603), and Bacillus subtilis (ATCC 6633) when compared to the plant extracts. At the same time, none was observed from the CuNPs. These AuNPs and CuNPs are particularly appealing in various biomedical and conductivity manufacturing applications due to their shapes and sizes and economical and environmentally friendly production. To our knowledge, this is the first study of the synthesis of gold and copper nanoparticles from L. discolor.

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Section: The Morphology Of the Synthesized Nanoparticles Using Scanni...mentioning

confidence: 99%

Section: The Morphology Of the Synthesized Nanoparticles Using Scanni...mentioning

confidence: 99%

Green Synthesis of Gold and Copper Nanoparticles by Lannea discolor: Characterization and Antibacterial Activity

Rambau,

Masevhe,

Samie

2024

Inorganics

View full text Add to dashboard Cite

show abstract

“…Furthermore, there is unexpected sintering observed in Figure 4B after exposure to heat. Sintering involves the joining together of nanoparticles into a solid mass, due to temperature less than 250° C, pressure, and leftover alcohols during evaporation [31]. As such, during both synthesis and drying, the CuNPs undergo sintering, and the well-connected features are observed in Figure 4B.…”

Section: Morphology Of Synthesised Nanoparticles Using Scanning Elect...mentioning

confidence: 99%

Green Synthesis, Characterization and Antibacterial Activity of Gold and Copper Nanoparticles from Lannea discolor (Sond.) Engl

Rambau,

Masevhe,

Akwu

et al. 2023

Preprint

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Green synthesis using plant extracts has emerged as an eco-friendly, clean, and viable strategy alternative to chemical and physical approaches. The leaf, stem, and root extracts of Lannea discolor was utilized as a reducing and stabilizing agent in the synthesis of gold (AuNPs) and copper (CuNPs) nanoparticles. The formation of AuNPs and CuNPs confirmed by their color change, was characterised by UV–Vis Spectroscopy (UV- Vis), Scanning electron microscopy analysis and energy dispersive x-ray (SEM-EDX), Transmission Electron Microscopy (TEM), and Fourier Transform Infrared Spectroscopy (FTIR), coupled with minimum concentration inhibitory (MIC) antibacterial assays. AuNFs, NPs and CuNPs peaked at wavelengths in the ranges of 316, 544 and 564 nm respectively. TEM showed unexpected nanoflowers (30 – 97 nm) in the leaf extracts and spherical NPs (10 -33 nm; 9.3 – 37.5) from stem and root extracts, while spherical CuNPs (20 – 104 nm), were observed from all the extracts. EDX was able to confirm the presence of metal salts and FTIR revealed stable capping agents. AuNPs and NFs from L. discolor extracts showed appreciable antibacterial activity against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae and Bacillus subtilis, when compared to the plant extracts, while none was observed from the CuNPs. These AuNPs and CuNPs are particularly appealing in a variety of applications in the biomedical as well as conductivity manufacturing, due to their shapes and sizes and economical and environmentally friendly production.

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“…A novel fabrication method for TiAl alloys and composites is the Spark Plasma Sintering (SPS) technique. SPS offers the ability to fabricate alloys and composites with high densification of constituent powders within a relatively short processing time [ 29 , 30 ] and lower temperature, and also prevents impurities from reacting with the component [ 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation and Structural Analysis of Sintered TiAl(100−x)-xTaN Composites at Room Temperature

2023

Self Cite

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The nanohardness, elastic modulus, anti-wear, and deformability characteristics of TiAl(100−x)-xTaN composites containing 0, 2, 4, 6, 8, and 10 wt.% of TaN were investigated via nanoindentation technique in the present study. The TiAl(100−x)-xTaN composites were successfully fabricated via the spark plasma sintering technique (SPS). The microstructure and phase formation of the TiAl sample constitute a duplex structure of γ and lamellar colonies, and TiAl2, α-Ti, and TiAl phases, respectively. The addition of TaN results in a complex phase formation and pseudo duplex structure. The depth-sensing indentation evaluation of properties was carried out at an ambient temperature through a Berkovich indenter at a prescribed load of 100 mN and a holding time of 10 s. The nanoindentation result showed that the nanohardness and elastic modulus characteristics increased as the TaN addition increased but exhibited a slight drop when the reinforcement was beyond 8 wt.%. At increasing TaN addition, the yield strain (HEr), yield pressure (H3Er2), and elastic recovery index (WeWt) increased, while the plasticity index (WpWt) and the ratio of plastic and elastic work (RPE) reduced. The best mechanical properties were attained at the 8 wt.%TaN addition.

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Sintering of nanocrystalline materials: Sintering parameters

Cited by 17 publications

References 90 publications

Green Synthesis of Gold and Copper Nanoparticles by Lannea discolor: Characterization and Antibacterial Activity

Green Synthesis of Gold and Copper Nanoparticles by Lannea discolor: Characterization and Antibacterial Activity

Green Synthesis, Characterization and Antibacterial Activity of Gold and Copper Nanoparticles from Lannea discolor (Sond.) Engl

Nanoindentation and Structural Analysis of Sintered TiAl(100−x)-xTaN Composites at Room Temperature

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