Nanoflakes of zinc oxide:cobalt oxide composites by pulsed laser fragmentation for visible light photocatalysis

Kanakkillam, Sreed Sharma; Shaji, Sadasivan; Krishnan, Bindu; Vázquez‐Rodríguez, Sofia; Aguilar-Martínez, J.A.; Palma, Maria Isabel Mendivil; Avellaneda, David Avellaneda

doi:10.1016/j.apsusc.2019.144223

Cited by 40 publications

(25 citation statements)

References 68 publications

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“…While comparing the morphology of these nanocomposites with our previous work, the morphology has a significant difference. The cryo-milled assisted pulsed laser fragmentation of zinc oxide and cobalt oxide provided different types of nanoflakes [10] , whereas here in this work we observed a gradual change in morphology, that is agglomerated particles to petal shaped and then to spherical particles. In the literature, we can observe some works related to the nanocomposites of zinc oxide and cobalt oxide.…”

Section: Resultscontrasting

confidence: 52%

“…These researches show better application results, and which urge us to focus on a related investigation. Our previous work with zinc oxide and cobalt oxide showed better photocatalytic efficiency than the normal zinc oxide and cobalt oxide [10] .…”

Section: Introductionmentioning

confidence: 68%

“…1 (b). We have already reported the synthesis and photocatalytic studies of zinc oxide: cobalt oxide nanocomposite by cryomilling assisted pulsed laser fragmentation technique [10] . So, here we are using the procedure of nanocomposite synthesis in a different way.…”

Section: Resultsmentioning

confidence: 99%

“…Our group modified TiO 2 to black TiO 2 with the help of pulsed laser irradiation of white TiO 2 dispersed in water using 532 nm laser output [14] . In our previous work, we successfully synthesized and characterized the structure, morphology, optical photocatalytic properties of zinc oxide cobalt oxide nanoflakes from cryomilled zinc oxide and cobalt oxide powders [10] . Also, stable nanocolloids of cobalt oxide were prepared in water using pulsed laser fragmentation in liquid [15] .…”

Section: Introductionmentioning

confidence: 99%

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A simple synthesis of ZnO:Co2O3 nanocomposites by pulsed laser irradiation in liquid

Kanakkillam

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Avellaneda

et al. 2020

Materials Today: Proceedings

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Highlights ZnO:Co 2 O 3 nanocomposites by pulsed laser irradiation in water. Morphology was modified by laser irradiation and Co 2 O 3 content. Elemental composition and their chemical states were confirmed by XPS. Nanocomposites showed higher visible light absorption compared to ZnO. Thin films of the ZnO:Co 2 O 3 nanocomposites showed visible light photocatalysis.

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Section: Resultscontrasting

confidence: 52%

Section: Introductionmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A simple synthesis of ZnO:Co2O3 nanocomposites by pulsed laser irradiation in liquid

Kanakkillam

Krishnan

Avellaneda

et al. 2020

Materials Today: Proceedings

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“…The elemental composition was quantified using an ICP-OES (Thermo Scientific iCAP 6500-ICP-OES CID). It was observed that as the ablation time doubled, the concentration had no significant increase in nanostructure filler fraction; this might be due to the post irradiation effect of the nanofluids [50]. Thus, the particle size will be reduced further as the laser ablation time increases.…”

Section: Icp-oes/elemental Composition Analysismentioning

confidence: 99%

Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

et al. 2020

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Lubricants and fluids are critical for metal-mechanic manufacturing operations as they reduce the friction and wear of tooling and components, and serve as coolants to dissipate the heat generated in these operations. The proper application of these materials improves machine operative life and tooling, and decreases cost, energy, and time consumption for maintenance, damage, repairs, or the need to exchange pieces/components within the machinery. Natural or vegetable-based lubricants have emerged as a substitute for mineral oils, which harm the environment due to their low biodegradability and have negative effects on human health (e.g., causing skin/respiratory diseases). Thus, finding biocompatible and efficient lubricants has become a technology objective for researchers and industry. This study evaluates soybean-, corn-, and sunflower-based lubricants reinforced with silver (Ag) nanostructures by a pulsed laser ablation process. Thermal and tribological evaluations were performed with varying Ag contents, and temperature-dependent behavior was observed. Thermal conductivity improvements were observed for all nanofluids as the temperature and Ag concentration increased (between 15% and 24%). A maximum improvement of 24% at 50 °C and 10 min exposure time of the pulsed laser ablation process for soybean oil was observed. The tribological evaluations showed improvements in the load-carrying capacity of the vegetable oils, i.e., an increase from 6% to 24% compared to conventional materials. The coefficient of friction performance also showed enhancements with Ag concentrations between 4% and 15%.

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Synergistic promotion of the photocatalytic efficacy of CuO nanoparticles by heteropolyacid‐attached melem: Robust photocatalytic efficacy and anticancer performance

Liu

Abbaspour

Rouki

et al. 2022

Applied Organom Chemis

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The in situ photocatalytic oxidation of aromatic alcohols to aldehydes by air under visible-light-driven condition is an attractive and beneficial route regarding environmental crises and worldwide energy economy. Herein, CuOmelem-heteropolyacid nanophotosensitizer is disclosed as an efficient heterostructured nanocomposite involving H 5-n PW 10 V 2 O 40 nÀ … (melem-NH 3 + ) n ionic liquid, successfully prepared via a facile and straightforward procedure.This nanocomposite is characterized employing routine techniques such as Xray diffraction (XRD), Fourier transform infrared (FT-IR), diffuse reflectance spectra (DRS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM),and Brunauer-Emmett-Teller (BET). The resultant nanocomposite exhibited superior photocatalytic efficacy than its pristine melem, HPA, and CuO constituents in the in situ photo-oxidation of benzylic alcohols and in the fast condensation with o-phenylenediamine to generate a range of 2-substituted benzimidazoles, as important precursors in the synthesis of important pharmaceuticals under the illumination of a green laser light (λ 535 nm). This study suggests a radical pathway involving reactive species such as •O 2 À and OH• together with h + in a photocatalytic process. Stability and reusability experiments along with hot filtration test ensured sufficient reproducibility of the nanophotocatalyst in the reaction medium. At the final part of this study, the in vitro cellular cytotoxicity of CuO-melem-heteropolyacid nanohybrid material was evaluated on A549 human lung cancer cell line with the MTT assay.The distinct reduction in cell viability affirmed cytotoxicity of the nanomaterial against the performed cell line.

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Nanoflakes of zinc oxide:cobalt oxide composites by pulsed laser fragmentation for visible light photocatalysis

Cited by 40 publications

References 68 publications

A simple synthesis of ZnO:Co2O3 nanocomposites by pulsed laser irradiation in liquid

A simple synthesis of ZnO:Co2O3 nanocomposites by pulsed laser irradiation in liquid

Tribological and Thermal Transport of Ag-Vegetable Nanofluids Prepared by Laser Ablation

Synergistic promotion of the photocatalytic efficacy of CuO nanoparticles by heteropolyacid‐attached melem: Robust photocatalytic efficacy and anticancer performance

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