Mechanochemical synthesis of α‐Al2O3‐Cr3+ (Ruby) and χ‐Al2O3

Cortes-Vega, Fernando D.; Yang, Weidong; Zárate‐Medina, J.; Brankovic, Stanko R.; Calderón, Héctor A.; Hernandez, Francisco C. Robles

doi:10.1111/jace.16171

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Nanomaterials can be produced using several approaches: mechanical milling, electrospinning, lithography, sputtering, the arc discharge method, laser ablation/fragmentation, chemical vapor deposition, solvothermal and hydrothermal methods, the sol-gel method, soft and hard templating methods and reverse micelle methods [64,65]. Laser ablation in liquid or ball milling methods is usually used to synthesize ruby particles [41,[66][67][68]. The advantage of laser-generated materials is their purity because there is no need for any acids or polymer stabilizers [46], as well as the absence of impurities formed during ball milling.…”

Section: Discussionmentioning

confidence: 99%

Ruby Nanoparticles for Greenhouse Farming: Synthesis, Features and Application

Paskhin,

Aiyyzhy,

Pobedonostsev

et al. 2023

J. Compos. Sci.

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In this work, we investigated the effect of photoconversion covers based on ruby (chromium-doped alumina (Al2O3:Cr3+)) particles (PCC-R) on the growth and development of lettuce (Lactuca sativa) plants. Ruby particles (from 100 nm to 2 μm) were obtained by the sequential application of spall laser ablation and further laser fragmentation. The content of chromium ions relative to aluminum ions in the nanoparticles was 3.3 × 10−3. The covers with different densities of applied ruby particles (2 × 107 m−2 (PCC-R7), 2 × 108 m−2 (PCC-R8), 2 × 109 m−2 (PCC-R9)) were studied in the present work. The PCC-Rs had two wide bands of luminescence excitation. The first one was from 350 nm to 450 nm with a maximum at 405 nm, and the second one was from 500 nm to 600 nm with a peak at 550 nm. Synthesized covers emitted in the range of 650 nm to 750 nm, with a peak at 695 nm. It has been shown that PCC-R8, in contrast to PCC-R7 and PCC-R9, provided an increase in yield by 40% and was characterized by increased water use efficiency during dark respiration and assimilation of carbon dioxide in plants. It is assumed that the observed positive effect of PCC-R8 photoconversion covers is associated with the activation of regulatory mechanisms due to a qualitative change in the light spectrum.

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Section: Discussionmentioning

confidence: 99%

Ruby Nanoparticles for Greenhouse Farming: Synthesis, Features and Application

Paskhin,

Aiyyzhy,

Pobedonostsev

et al. 2023

J. Compos. Sci.

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“…Actually, in this experiment, the small quantities α-Cr: Al 2 O 3 (0.2%) synthesized by mechanical activation at room temperature (first stage) acts as the seed or heterogenous sites for the secondary nucleation process and is responsible for a temperature drop of approximately 200°C (up to 867 °C) for crystallization of the ruby (second stage). The ruby (α-Al2O3-Cr2O3(0.2%) synthesis at low temperature, via the mechanical activation and via chi-alumina (χ-Al2O3) has been made by Cortes-Vega et al [145,146] show that the critical problems in this crystal growth synthesis were finding the right concentrations of Cr2O3 and using Raman spectroscopy to detect very low concentrations of chromium in ruby-diluted compositions. The presence of (α-Al2O3-Cr2O3 (0.2%) ruby phase was further confirmed with HRTEM (high-resolution transmission electron microscopy).…”

Section: Mechanical Activation Of Boehmite -Transition γ Al2o3 To α-A...mentioning

confidence: 99%

Short review on mechanical activation in non-metallurgical alumina production

Kim¹,

Dobra²,

Isopescu³

et al. 2022

RJEEC

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The terms mechano-chemistry and mechanical activation of solid materials were introduced in chemical literature by Ostwald at the beginning of the XX century. Both terms cover a whole range of interconnected phenomena taking place during the mechanical action on solids or their separate parts participating in chemical reactions, phase transitions, mixing and creating composite materials, alloying and crystal growth in the solid state, deformation and changing physical and thermal properties, all of them at low temperature. The common effects of the mechanical activation on solid material are fracturing and reduction of particle sizes, generation of new reactive surfaces, diffusion of atoms of the reactant phase through the product phase, and quite significantly, accumulating energy in crystalline or amorphous structure (enough twists in atomic and molecular networks, tensions in atomic bond and active sites to trigger the nucleation of new phases). Mechanical activation is very used to produce all clean alumina mineralogical phases with uniform particle size dimensions from nano to macro size. Also, mechanical activation may extend the specific surface of some minerals, enhancing the yields in the solid-liquid extraction process. With adequate precursors, all phase transitions from amorphous to alfa α-Al2O3 can be carried out on the same route as in thermally activated alumina, but some other routes, impossible by thermal activation, might be followed. The difference between the two activation ways is that mechanical activation is made at room temperature.

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Structural, optical, mechanical, and electronic properties of Cr-doped alumina

Mohamed

Wahba

2020

J Mater Sci: Mater Electron

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Mechanochemical synthesis of α‐Al₂O₃‐Cr³⁺ (Ruby) and χ‐Al₂O₃

Cited by 6 publications

References 21 publications

Ruby Nanoparticles for Greenhouse Farming: Synthesis, Features and Application

Ruby Nanoparticles for Greenhouse Farming: Synthesis, Features and Application

Short review on mechanical activation in non-metallurgical alumina production

Structural, optical, mechanical, and electronic properties of Cr-doped alumina

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