Top-down and bottom-up approaches to obtain magnetic nanoparticle of Fe3O4 compound: Pulsed laser deposition and chemical route

Torres, Wilmar Serodio; Alcantara, A.S.; Bini, Raquel Dosciatti; Alvim, M.B.; Santos, Mauricio Cougo dos; Cótica, L. F.; Rocco, D.L.

doi:10.1016/j.matchemphys.2022.126511

Cited by 11 publications

(2 citation statements)

References 48 publications

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“…The top-down method was then applied to convert the phosphor micropowder to the corresponding nanoparticles [33]. TEM analysis of LAN showed diameters of 7-9 nm (Figure 2).…”

Section: Preparation Of Polyurethane Paintsmentioning

confidence: 99%

“…The combination was dried in a digital furnace at 95 C for 3 h, ground for 2 h, and sintered at 1350 C for 3 h. The phosphor micropowder (11-18 μm) was produced by grinding and sieving. Top-down processing of phosphor microparticles (15 g) was performed using a ball milling vial located on a vibrating plate and yielded phosphor nanoparticles [33]. Another silicon carbide ball mill (0.1 cm) was exposed to continuous collisions for 22 h with the phosphor micropowder and the vibrating plate to give the corresponding nanopowder (LAN).…”

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confidence: 99%

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Graphene nanosheet reinforcement of polyurethane nanocomposite for green and sustainable photoluminescence, superhydrophobic, and anticorrosive paint

Khalaf,

Abd El‐Lateef,

Abou Taleb

et al. 2024

Luminescence

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A simple and environmentally friendly method was developed for smart and efficient waterborne polyurethane (PUR) paint. Sugarcane bagasse was recycled into reduced graphene oxide nanosheets (rGONSs). Both lanthanide‐doped aluminate nanoparticles (LAN; photoluminescent agent, 7–9 nm) and rGONSs (reinforcement agent) were integrated into a waterborne polyurethane to produce a novel photoluminescent, hydrophobic, and anticorrosive nanocomposite coating. Using ferrocene‐based oxidation under masked circumstances, graphene oxide nanosheets were produced from sugarcane bagasse. The oxidized semicarbazide (SCB) nanostructures were integrated into polyurethane coatings as a drying, anticorrosion, and crosslinking agent. Polyurethane coatings with varying amounts of phosphor pigment were prepared and subsequently applied to mild steel. The produced paints (LAN/rGONSs@PUR) were tested for their hydrophobicity, hardness, and scratch resistance. Commission Internationale de l'éclairage (CIE) Laboratory parameters and photoluminescence analysis established the opacity and colourimetric properties of the nanocomposite coatings. When excited at 365 nm, the luminescent transparent paints emitted a strong greenish light at 517 nm. The anticorrosion characteristics of the coated steel were investigated. The phosphor‐containing (11% w/w) polyurethane coatings displayed the most pronounced anticorrosion capability and long‐persistent luminosity. The prepared waterborne polyurethane paints were very photostable and durable.

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“…The top-down method was then applied to convert the phosphor micropowder to the corresponding nanoparticles [33]. TEM analysis of LAN showed diameters of 7-9 nm (Figure 2).…”

Section: Preparation Of Polyurethane Paintsmentioning

confidence: 99%

mentioning

confidence: 99%

Graphene nanosheet reinforcement of polyurethane nanocomposite for green and sustainable photoluminescence, superhydrophobic, and anticorrosive paint

Khalaf,

Abd El‐Lateef,

Abou Taleb

et al. 2024

Luminescence

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Nanosized TiO2 synthesis via facile chemical top-down approach: enhancing gaseous photocatalytic performance

Fukugaichi

2023

J Mater Sci

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Effects of Reaction Temperature and Time on Structural, Morphological and Optical Properties of Magnetite Quantum Dots Prepared by Solvothermal Method

Ajibade,

Mona,

Songca

2023

J Inorg Organomet Polym

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Magnetite quantum dots were synthesized by solvothermal method in a conventional reflux setup, in an inert environment, at different reaction temperatures and times. Powder X-ray diffraction patterns of the as-prepared iron oxide confirmed magnetite crystalline phases irrespective of the reaction conditions. TEM micrographs revealed that the iron oxides obtained at 200, 180 and 165 °C are spherical in shapes with mean particle sizes of 3.25, 3.3 and 3.90 nm respectively, showing an increase in particle size with decreasing temperature. TEM micrographs revealed that particles obtained at 6 and 3 h have a mean particle size of 3.25 nm while particles obtained at 4.5-h has a bigger mean particle size of 7.5 nm. The results show that irrespective of the synthetic parameters, the average particle sizes of the magnetite are in the range 3–8 nm and could be described as quantum dots. Optical absorption spectra of the as-prepared magnetite quantum dots exhibited maximum absorption in the range of 200–210 nm. Fe3O4-1, Fe3O4-2 and Fe3O4-3 synthesized at 200, 180 and 165 °C have energy band gaps of 5.49, 5.13 and 5.01 eV respectively, showing a decrease in band gap with decreasing temperature. Fe3O4-4 and Fe3O4-6 synthesized at 6 and 3 h have optical band gap of 5.44 eV while Fe3O4-5 synthesized at 4.5 h has a band gap of 3.75 eV. FTIR spectra confirmed the passivation of the surface of the as-prepared magnetite quantum dots by oleate.

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Top-down and bottom-up approaches to obtain magnetic nanoparticle of Fe3O4 compound: Pulsed laser deposition and chemical route

Cited by 11 publications

References 48 publications

Graphene nanosheet reinforcement of polyurethane nanocomposite for green and sustainable photoluminescence, superhydrophobic, and anticorrosive paint

Graphene nanosheet reinforcement of polyurethane nanocomposite for green and sustainable photoluminescence, superhydrophobic, and anticorrosive paint

Nanosized TiO2 synthesis via facile chemical top-down approach: enhancing gaseous photocatalytic performance

Effects of Reaction Temperature and Time on Structural, Morphological and Optical Properties of Magnetite Quantum Dots Prepared by Solvothermal Method

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