Synthesis, characterisation and thermal conductivity of CuO - water based nanofluids with different dispersants

Pavithra, K. S.; Fasiulla,; Puttaiahgowda, Yashoda Malgar; Prasannakumar, S.

doi:10.1080/02726351.2019.1574941

Cited by 23 publications

(9 citation statements)

References 39 publications

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“…The addition of dispersant is an important factor to modify the physical and thermal properties of the NPs such as conductivity and viscosity [ 85 ]. The addition of dispersants was helpful in heat resistance in heat transfer applications and helped in foam formation during the heat and coal process [ 86 ].…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Zinc Oxide Nanoparticles (ZnO-NPs) Using Arthrospira platensis (Class: Cyanophyceae) and Evaluation of their Biomedical Activities

et al. 2021

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In this study, zinc oxide nanoparticles (ZnO-NPs) were successfully fabricated through the harnessing of metabolites present in the cell filtrate of a newly isolated and identified microalga Arthrospira platensis (Class: Cyanophyceae). The formed ZnO-NPs were characterized by UV–Vis spectroscopy, Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Data showed the efficacy of cyanobacterial metabolites in fabricating spherical, crystallographic ZnO-NPs with a size ≈30.0 to 55.0 nm at a wavelength of 370 nm. Moreover, FT-IR analysis showed varied absorption peaks related to nanoparticle formation. XPS analysis confirms the presence of Zn(II)O at different varied bending energies. Data analyses exhibit that the activities of biosynthesized ZnO-NPs were dose-dependent. Their application as an antimicrobial agent was examined and formed clear zones, 24.1 ± 0.3, 21.1 ± 0.06, 19.1 ± 0.3, 19.9 ± 0.1, and 21.6 ± 0.6 mm, at 200 ppm against Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, and Candida albicans, respectively, and these activities were reduced as the NPs concentration decreased. The minimum inhibitory concentration (MIC) values were determined as 50 ppm for S. aureus, 25 ppm for P. aeruginosa, and 12.5 ppm for B. subtilis, E. coli, and C. albicans. More interestingly, ZnO-NPs exhibit high in vitro cytotoxic efficacy against cancerous (Caco-2) (IC50 = 9.95 ppm) as compared with normal (WI38) cell line (IC50 = 53.34 ppm).

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Section: Resultsmentioning

confidence: 99%

Green Synthesis of Zinc Oxide Nanoparticles (ZnO-NPs) Using Arthrospira platensis (Class: Cyanophyceae) and Evaluation of their Biomedical Activities

et al. 2021

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“…The contact zone reaches its boiling point, resulting in an explosion that releases nanodroplets and ionized materials onto the substrate [38]. As ionized matter nucleates and grows, these nanodroplets can solidify on the medium and form spherical micrometric and submicrometric particles, which appear to develop from the aggregation of fine nanoparticles [7,39,40]. The EDS examination confirms that even the microstructured particles are constituted of Ag, as seen in Figure 7a.…”

Section: Fesem Imaging Of Ag Npsmentioning

confidence: 71%

“…FESEM images show that laser-ablated nanostructures have a spherical form [17,38]. As a result, CTAB surfactant was used as a nanoparticle stabilizing agent, protecting them against aggregation and other external influences [39].…”

Section: Fesem Imaging Of Ag Npsmentioning

confidence: 99%

Fabrication of Silver Nanoparticles in Aqueous Solution by Laser Technique and Study of Their Hemocompatibility and Antibacterial Effects Against Dental Decay Bacteria

Abbas¹,

Haleem²,

Kadhima³

2023

ETJ

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“…When high-intensity laser pulses contact a copper target, the interaction zone's temperature rises to its boiling point, causing an explosion in which nanodroplets (clusters of free atoms) are blasted from the target onto the substrate surface. These nanodroplets can solidify on the substrate and form spherical micrometric and submicrometric particles, which seem to be formed as a result of fine nanoparticle aggregation while ionized matter nucleates and grows [31,32]. The EDS examination indicates that even the micrometric particles are copper or copper oxide, as shown in Figs.…”

Section: Fesem Imagingmentioning

confidence: 96%

The Antibacterial Activities of Copper Oxide Nanoparticles Synthesized Using Laser Ablation in Different Surfactants against Streptococcus mutans

Abbas¹,

Kadhim²,

Haleem³

2023

Journal of Renewable Materials

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Copper oxide nanoparticles (CuO NPs) were synthesised with laser ablation of a copper sheet immersed in deionized water (DW), cetrimonium bromide (CTAB), and sodium dodecyl sulphate (SDS), respectively. The target was irradiated with a pulsed Nd: YAG laser at 1064 nm, 600 mJ, a pulse duration of 10 ns, and a repetition rate of 5 Hz. The CuO NPs colloidal were analyzed using UV-Vis spectroscopy, the Fourier transform infrared (FTIR) spectrometer, zeta potential (ZP), X-ray diffraction (XRD), transmission electron microscope (TEM) and field emission scanning electron microscopy (FESEM). The absorption spectra of CuO NPs colloidal showed peaks at 214, 215 and 220 nm and low-intensity peaks at 645, 650 and 680 nm for SDS, CTAB and DW, respectively. CuO NPs' colloidal results are (−21.6, 1.2, and 80 mV) for negatively, neutrally, and positively charged SDS, DW, and CTAB, respectively. The XRD pattern of the NPs revealed the presence of CuO phase planes (110) ( 111), (20-2) and (11-1). The TEM images revealed nearly spherical NPs, with sizes ranging from 10-90, 10-50, and 10-210 nm for CuO NPs mixed with DW, SDS and CTAB, respectively. FESEM images of all the synthesized samples illustrate the formation of spherical nanostructure and large particles are observable. The CuO NPs were tested for antibacterial activity against Streptococcus mutans by using the well diffusion method. In this method, CuO NPs prepared in DW at a concentration of 200 μg/mL showed a greater inhibition zone against Streptococcus mutans.

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Synthesis, characterisation and thermal conductivity of CuO - water based nanofluids with different dispersants

Cited by 23 publications

References 39 publications

Green Synthesis of Zinc Oxide Nanoparticles (ZnO-NPs) Using Arthrospira platensis (Class: Cyanophyceae) and Evaluation of their Biomedical Activities

Green Synthesis of Zinc Oxide Nanoparticles (ZnO-NPs) Using Arthrospira platensis (Class: Cyanophyceae) and Evaluation of their Biomedical Activities

Fabrication of Silver Nanoparticles in Aqueous Solution by Laser Technique and Study of Their Hemocompatibility and Antibacterial Effects Against Dental Decay Bacteria

The Antibacterial Activities of Copper Oxide Nanoparticles Synthesized Using Laser Ablation in Different Surfactants against Streptococcus mutans

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