A facile sol-gel strategy for the scalable synthesis of CuFe2O4 nanoparticles with enhanced infrared radiation property: Influence of the synthesis conditions

Hou, Haili; Xu, Guoyue; Tan, Shujuan; Zhu, Yongmei

doi:10.1016/j.infrared.2017.07.008

Cited by 35 publications

(13 citation statements)

References 34 publications

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“…The SEM results of Cu 1−x K x Fe 2 O 4 catalysts are shown in Figure 4. It is shown that the nature of the catalysts are the spongy structures consisting of many agglomerated particles and pores 40 . The holes observed in the CuFe 2 O 4 , Cu 0.95 K 0.05 Fe 2 O 4 , and Cu 0.9 K 0.1 Fe 2 O 4 are ascribed to gases released by the pyrolysis of nitrate and citric acid in the catalysts preparation 41,42 .…”

Section: Resultsmentioning

confidence: 95%

“…It is shown that the nature of the catalysts are the spongy structures consisting of many agglomerated particles and pores. 40 The holes observed in the CuFe 2 O 4 , Cu 0.95 K 0.05 Fe 2 O 4 , and Cu 0.9 K 0.1 Fe 2 O 4 are ascribed to gases released by the pyrolysis of nitrate and citric acid in the catalysts preparation. 41,42 While no holes are observed in Cu 0.85 K 0.15 Fe 2 O 4 sample, it may be related to the high content of doped potassium in Cu 0.85 K 0.15 Fe 2 O 4 , leading to the lower melting point of the catalyst and changing the flow state on the catalyst surface during synthesis.…”

Section: Catalysts Characterizationmentioning

confidence: 92%

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Enhanced soot oxidation by oxygen vacancies via K ⁺ doped CuFe ₂ O ₄ spinel catalysts

Abuelgasim

Wang

et al. 2022

Intl J of Energy Research

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Summary Soot particulate emitting from diesel engines are serious to both human health and environment. Efficient catalyst is vital in diesel particulate filter technology to decrease soot oxidation temperature. Cu1−xKxFe2O4 (x = 0, 0.05, 0.1, and 0.15) catalysts are synthesized and analyzed with XRD, Raman, BET, SEM, TEM, TG, EDS, XPS, catalytic activity tests, and kinetic analysis. The results suggests that many factors affect the catalytic activity, and the contents of oxygen vacancies are dominant. A large amount of oxygen vacancies which facilitate to the soot oxidation are created with the assistance of K+, and they increase with the increasing doping contents. Excessive surface concentration of K+ may lead to the partially covering of active sites of the catalysts. Therefore, Cu0.9K0.1Fe2O4 catalyst exhibits the best catalytic activity in soot oxidation, which decreases the Tmax of soot by 279°C. This decrease makes it highly promising for application in diesel particulate filter.

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Section: Resultsmentioning

confidence: 95%

Section: Catalysts Characterizationmentioning

confidence: 92%

Enhanced soot oxidation by oxygen vacancies via K ⁺ doped CuFe ₂ O ₄ spinel catalysts

Abuelgasim

Wang

et al. 2022

Intl J of Energy Research

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“…In general, high porosity and large specific surface area (SSA) help to improve the infrared radiative properties of the materials. 20 Hence, nitrogen adsorption and desorption tests were employed to elucidate the pore structure and SSA of CNFO-X samples (Figure 2C; Figure S5). Evidently, all samples exhibit a multistage pore structure with the coexistence of macropores and mesopores.…”

Section: Structural and Physicochemical Analysismentioning

confidence: 99%

“…Additionally, beyond the abovementioned internal contribution of the intrinsic crystal structure to the infrared emissivity, the porous and loose structures of the material, as external causes, also play a considerable role in the infrared radiation behavior and physical properties of the coating. 20,21 According to Kirchhoff's rule, the infrared emissivity and absorption rates are of equal significance for an object under thermal equilibrium conditions. 21 As a result, the majority of the infrared radiation reaching the coating surface can be effectively absorbed through the pores when substantial pores exist inside the filler particles, thus facilitating excellent infrared radiation performance.…”

Section: Introductionmentioning

confidence: 99%

Band gap and oxygen vacancy engineering of honeycomb‐like CuFe₂O₄ spinels toward enhanced high infrared emissivity

et al. 2023

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Recently, copper ferrites have acquired widespread attraction in high infrared radiation fields owing to their remarkable cost efficiency. However, to achieve broader applications under various operating conditions, it is essential to further improve the infrared emissivity, particularly at high temperatures. Herein, the Ni‐doped CuFe2O4 (NCFO) honeycomb‐like frameworks, which are constructed with single‐crystal nano‐subunits, are successfully fabricated via the scalable sol–gel avenue. The unique porous honeycomb framework endows NCFO with enhanced infrared absorption and relieves the stress between coatings and substrates meanwhile. With both band gap and oxygen vacancy (OV) engineering of CuFe2O4 itself via smart Ni doping, a maximum lattice strain, the richest OVs, and the narrowest band gap (∼1.63 eV) are simultaneously achieved for the CuFe2O4 with 15% Ni doping (denoted as CNFO‐15). Benefiting from the synergy of these external and intrinsic contributions, the CNFO‐15 possesses an ultrahigh infrared emissivity (∼0.975) in the wavelength range of 3–5 µm at a test temperature of 800°C. Moreover, the CNFO‐15‐based coating displays superior infrared radiation performance with outstanding high‐temperature resistance. More meaningfully, the constructive design here will provide a distinctive perspective for future large‐scale fabrication of advanced high‐infrared‐emissivity coatings.

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“…CuFe2O4 has inverse spinel structure which in that Cu 2+ cations and half of the Fe 3+ cations occupy octahedral sites, while the other half of the Fe 3+ cations occupy tetrahedral sites. Inverse spinel ferrites have been utilized as catalysts in reactions such as azide-alkyne cycloaddition, epoxide ring-opening and the Ullmann coupling [4,5].…”

Section: Introductionmentioning

confidence: 99%

ZnS/CuFe2O4: Magnetic Hybrid Nanocomposite to Catalyze the Synthesis of 2,4,5-triaryl-1H-imidazole Derivatives

Hassanzadeh‐Afruzi¹,

Bahrami²,

Maleki³

2019

The 23rd International Electronic Conference on Synthetic Organic Chemistry

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Integration of nanomaterials is an entirely new method to synthesis efficient catalysts. These compounds provided new characteristics and distinctive application which is not accessible in the single-particle nanostuctures. Although there is little catalytic activity in each component of the hybrid material, their hybrid displays much higher activity. Indeed, the presence of intermediate metal and their oxides in the framework of hybrid catalyst caused a synergistic effect, thus facilitate the organic reaction more effectively. The extensive biochemical and pharmacological activities of imidazole-containing compounds have required the development of efficient methods for synthesizing these compounds, which is a significant topic in organic chemistry. The imidazole nucleus function as a main scaffold for constructing of biologically important molecules. The ZnS/CuFe2O4 magnetic hybrid nanocatalyst was synthesized by a simple co precipitation and characterized by conventional analyses successfully. Synthesized nanocomposite was utilized as a magnetic and heterogeneous catalyst for the one-pot synthesis of 2,4,5-triaryl-1H-imidazole derivatives with condensation of various aromatic aldehydes, benzil and ammonium acetate. The presented method shows some advantages such as mild conditions, good yields, and simple separation of products from the reaction mixture and cost-effective catalyst. The experimental data showed ZnS/CuFe2O4 nanocatalyst were easily separated from the reaction mixture using an external magnetic field and use again five times in subsequent reactions without appreciable reduction in catalytic activity.

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A facile sol-gel strategy for the scalable synthesis of CuFe2O4 nanoparticles with enhanced infrared radiation property: Influence of the synthesis conditions

Cited by 35 publications

References 34 publications

Enhanced soot oxidation by oxygen vacancies via K ⁺ doped CuFe ₂ O ₄ spinel catalysts

Enhanced soot oxidation by oxygen vacancies via K ⁺ doped CuFe ₂ O ₄ spinel catalysts

Band gap and oxygen vacancy engineering of honeycomb‐like CuFe₂O₄ spinels toward enhanced high infrared emissivity

ZnS/CuFe2O4: Magnetic Hybrid Nanocomposite to Catalyze the Synthesis of 2,4,5-triaryl-1H-imidazole Derivatives

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A facile sol-gel strategy for the scalable synthesis of CuFe2O4 nanoparticles with enhanced infrared radiation property: Influence of the synthesis conditions

Cited by 35 publications

References 34 publications

Enhanced soot oxidation by oxygen vacancies via K + doped CuFe 2 O 4 spinel catalysts

Enhanced soot oxidation by oxygen vacancies via K + doped CuFe 2 O 4 spinel catalysts

Band gap and oxygen vacancy engineering of honeycomb‐like CuFe2O4 spinels toward enhanced high infrared emissivity

ZnS/CuFe2O4: Magnetic Hybrid Nanocomposite to Catalyze the Synthesis of 2,4,5-triaryl-1H-imidazole Derivatives

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Enhanced soot oxidation by oxygen vacancies via K ⁺ doped CuFe ₂ O ₄ spinel catalysts

Enhanced soot oxidation by oxygen vacancies via K ⁺ doped CuFe ₂ O ₄ spinel catalysts

Band gap and oxygen vacancy engineering of honeycomb‐like CuFe₂O₄ spinels toward enhanced high infrared emissivity