Highly-porous mayenite-based ceramics by combined suspension emulsification and reactive sintering

Baptista, Miguel F.; Kovalevsky, Andrei V.; Sarabando, Artur R.; Ferro, Marta C.; Capela, Isabel; Frade, J.R.

doi:10.1016/j.matlet.2018.11.061

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…As shown in Figure 7B, for the metallic samples (b), (c) and (d), the corresponding log[σ] is linear to T -1/4 with positive slopes in a temperature range of 300-5 K, suggesting a delocalization state of the carrier electrons. [ 8,19,[35][36][37] ] These results demonstrate that the insulating mixture precursors were converted to a good electronic conductor by facile sintering process. The resultant N e can be controlled merely by adjusting the addition amounts of Al.…”

Section: Characterization Techniquesmentioning

confidence: 77%

Insights into the direct formation of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) and its electrical characterization

2019

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C12A7:e− electrides are potentially useful in various technological applications. However, it usually needs to be synthesized through a complicated multistep process under severe conditions. Therefore, the search is on for a more facile and direct process that occurs under milder conditions. Here, a facile and efficient synthesis strategy has been developed for the rapid production of highly conductive C12A7:e− directly from commercially available chemical ingredients of CaO, Al2O3, and Al powders at 1200°C in a 10−2 Pa vacuum for 20 minutes using SPS process. The electron concentration in the as‐prepared C12A7:e− was enhanced up to 2.13 × 1021 cm−3 by simply regulating the addition amounts of Al, covering IM transition. The electronic structure results indicated the formation of homogeneous trapped electrons in the lattice. Further thermal analyses illustrated that Al made a dual function of reducing agent and and reaction promoter, which remarkably reduced the formation temperature of mayenite structure. This study fills in the gaps of direct formation mechanisms of conductive mayenite phase, and provides a new perspective to regulate the resultant Ne.

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Section: Characterization Techniquesmentioning

confidence: 77%

Insights into the direct formation of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) and its electrical characterization

2019

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“…Mayenite (Ca 12 Al 14 O 33 , C12A7) is a mesoporous calcium aluminate that recently has attracted many researchers from different fields of chemistry, with applications ranging from passive sampling to steam reforming [1][2][3][4][5][6]. The physical properties of mayenite are correlated to its crystalline structure.…”

Section: Introductionmentioning

confidence: 99%

A Novel Synthetic Route to Prepare High Surface Area Mayenite Catalyst for TCE Oxidation

et al. 2019

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Mayenite (Ca12Al14O33) was synthesized by a novel route based on the use of polymethyl methacrylate (PMMA) as a soft templating agent. The material was tested for the total oxidation of trichloroethylene in the gas phase and the catalytic performance was analysed when using different initial amounts of PMMA in the catalyst synthesis. The results were compared with those obtained with a mayenite synthetized by a classical hydrothermal method. The highest activity in terms of TCE conversion was achieved in the presence of mayenite prepared using 10% w/w of PMMA; its activity was also higher than that of the hydrothermal mayenite. The surface area and the number of superoxide anions (O2−) seem to be the main properties determining the catalytic activity of the material.

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Synthesis and characterization of low-cost hierarchical porous silica by nanoemulsion templating: influence of nanoemulsion volume and hydrodynamic diameter

Hessien

Prouzet

2021

J Sol-Gel Sci Technol

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Highly-porous mayenite-based ceramics by combined suspension emulsification and reactive sintering

Cited by 5 publications

References 17 publications

Insights into the direct formation of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) and its electrical characterization

Insights into the direct formation of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) and its electrical characterization

A Novel Synthetic Route to Prepare High Surface Area Mayenite Catalyst for TCE Oxidation

Synthesis and characterization of low-cost hierarchical porous silica by nanoemulsion templating: influence of nanoemulsion volume and hydrodynamic diameter

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Highly-porous mayenite-based ceramics by combined suspension emulsification and reactive sintering

Cited by 5 publications

References 17 publications

Insights into the direct formation of [Ca24Al28O64]4+(4e−) and its electrical characterization

Insights into the direct formation of [Ca24Al28O64]4+(4e−) and its electrical characterization

A Novel Synthetic Route to Prepare High Surface Area Mayenite Catalyst for TCE Oxidation

Synthesis and characterization of low-cost hierarchical porous silica by nanoemulsion templating: influence of nanoemulsion volume and hydrodynamic diameter

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Insights into the direct formation of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) and its electrical characterization

Insights into the direct formation of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) and its electrical characterization