Mechanistic Insights into a Sustainable Mechanochemical Synthesis of Ettringite

Stroh, Julia; Feiler, Torvid; Ali, Nazim; Piedade, Manuel E. Minas da; Emmerling, Franziska

doi:10.1002/open.201900215

Cited by 3 publications

(3 citation statements)

References 67 publications

(109 reference statements)

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“…In 2019, Emmerling and colleagues, including Minas da Piedade, were involved in mechanistic studies of the mechanosynthesis of ettringite [ 97 ]. Ettringite ([Ca 3 Al(OH) 6 ] 2 ·(SO 4 ) 3 ·26H 2 O) is an important mineral present in cement concretes, with technological potential due to its ion exchange ability.…”

Section: Developments Of Mechanochemistry In Portugalmentioning

confidence: 99%

“…Mechanochemistry reveals high conversion and short reaction times (94% in 2 h), without CO 2 release or wastewater production nor the need for product separation, contrary to the conventional wet-chemical traditional synthesis. Mechanistic studies were performed based on one-, two-, and three-step synthetic procedures, and the results provided a new understanding of mechanochemical ettringite formation, important for further improvement of synthesis efficiency, envisaging a possible industrial implementation [ 97 ].…”

Section: Developments Of Mechanochemistry In Portugalmentioning

confidence: 99%

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Mechanochemistry in Portugal—A Step towards Sustainable Chemical Synthesis

et al. 2021

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In Portugal, publications with mechanochemical methods date back to 2009, with the report on mechanochemical strategies for the synthesis of metallopharmaceuticals. Since then, mechanochemical applications have grown in Portugal, spanning several fields, mainly crystal engineering and supramolecular chemistry, catalysis, and organic and inorganic chemistry. The area with the most increased development is the synthesis of multicomponent crystal forms, with several groups synthesizing solvates, salts, and cocrystals in which the main objective was to improve physical properties of the active pharmaceutical ingredients. Recently, non-crystalline materials, such as ionic liquids and amorphous solid dispersions, have also been studied using mechanochemical methods. An area that is in expansion is the use of mechanochemical synthesis of bioinspired metal-organic frameworks with an emphasis in antibiotic coordination frameworks. The use of mechanochemistry for catalysis and organic and inorganic synthesis has also grown due to the synthetic advantages, ease of synthesis, scalability, sustainability, and, in the majority of cases, the superior properties of the synthesized materials. It can be easily concluded that mechanochemistry is expanding in Portugal in diverse research areas.

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Section: Developments Of Mechanochemistry In Portugalmentioning

confidence: 99%

Section: Developments Of Mechanochemistry In Portugalmentioning

confidence: 99%

Mechanochemistry in Portugal—A Step towards Sustainable Chemical Synthesis

et al. 2021

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“…Ettringite (Ca 6 Al 2 (SO 4 ) 3 (OH) 12 •26H 2 O) is a common early-age hydrate of ordinary Portland cement, calcium aluminate cement and calcium sulfoaluminate (CSA) cement [11,12]. Ettringite is a key constituent in cement-based construction materials because ettringite is formed in the first few hours of hydration and provides early-age strength to cement mixture [13,14]. The ettringite immediately crystallises into needle-like shapes with a large aspect ratio when water is added to calcium aluminate in the presence of calcium sulfate [11,15].…”

Section: Introductionmentioning

confidence: 99%

Early hydration and mechanical strength of calcite–ettringite seeds added cement mixture for 3D printing

Lim

Kim

et al. 2021

Advances in Applied Ceramics

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Cement mixture with calcite-ettringite seeds (CE seeds) was investigated in terms of early hydration and mechanical property. The ettringite crystals of ettringite seeds (E seeds) exhibited needle-like shapes with lengths of approximately 3 μm, and the ettringite crystals of CE seeds exhibited rodlike shapes with lengths less than 1 μm. A dense growth of network-structured ettringite and calcium silicate hydrate (C-S-H) was observed. The amount of cement hydrates was analysed by thermal analysis, and the weight loss of the hydrates was 1.62% (E seeds) and 1.79% (CE seeds) at approximately 104°C, indicating that the amount of hydrates was higher in the mixture with CE seeds. The average pore diameter and porosity of the mixtures decreased from 145 to 79 nm and from 14.88% to 13.89% with the addition of CE seeds. The initial and final setting times of the mixture with CE seeds were 20 and 21 min, which were 4.76% and 8.70% shorter than the setting times of mixture with E seeds. The compressive and flexural strengths of the mixture with CE seeds were 6% and 10% higher than those of the mixture with E seeds, respectively.

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