Multistep nucleation and growth mechanism of aluminosilicate gel observed by cryo-electron microscopy

Tang, Zhao Qing; Souza, Felipe Basquiroto de; Mulder, Roger J.; KwesiSagoe-Crentsil,; Duan, Wenhui

doi:10.1016/j.cemconres.2022.106873

Cited by 14 publications

(6 citation statements)

References 69 publications

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“…As the geopolymer aged, the N-A-S-H gel rearranged, and the aluminosilicate network showed reduced porosity, with more globular and smaller particles. Their results demonstrate another system following a nonclassical crystallization pathway …”

Section: Crystallization Of Hydrated Phases In Alternative Bindersmentioning

confidence: 99%

“…190 In the context of relevant phases for construction materials, multistep crystallization pathways involving PNCs have been demonstrated for several phases, and the number of identified cases continues to increase. Examples include calcium sulfate, 191 portlandite, 160,192 geopolymers (N-A-S-H gel), 193 magnesium carbonate, 194 magnesium silicate hydrate, 195 magnesium phosphate, 196 magnesium oxychloride. 197 Concerning portlandite formation, which is a highly relevant phase during the hydration of PC, a nonclassical crystallization mechanism has been proposed based mainly on two recent studies.…”

Section: Two-step Nucleationmentioning

confidence: 99%

“…Their results demonstrate another system following a nonclassical crystallization pathway. 193 The microstructure of the final gel (Figure 40), dictated by the Si/Al ratio, has been shown to regulate the material's mechanical properties, as in many other systems. 265 For gels with Si/Al ≥ 1.65, more homogeneous and less porous microstructures correlate with enhanced mechanical properties, whereas the worse mechanical behavior at Si/Al ratios ≤1.40 is explained by the higher porosity of the formed gel (Figure 40d).…”

Section: N-a-s-h and C-a-s-h Bindingmentioning

confidence: 99%

“…In the context of relevant phases for construction materials, multistep crystallization pathways involving PNCs have been demonstrated for several phases, and the number of identified cases continues to increase. Examples include calcium sulfate, portlandite, , geopolymers (N-A-S-H gel), magnesium carbonate, magnesium silicate hydrate, magnesium phosphate, magnesium oxychloride …”

Section: Understanding and Controlling C–s–h Nucleationmentioning

confidence: 99%

“… Schematic representation of the formation mechanism of geopolymers as proposed in ref ( 193 ). a) Dissolution/hydrolysis (1), oligomerization (2), and aggregation (3) are the three main reactions controlling the early age geopolymerization.…”

Section: Crystallization Of Hydrated Phases In Alternative Bindersmentioning

confidence: 99%

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