Physical-chemistry of silica/alkaline silicate interactions during consolidation. Part 1: Effect of cation size

Influence of raw materials and potassium and silicon concentrations on the formation of a zeolite phase in a geopolymer network during thermal treatment

“…Hajimohammadi et al [47] have identified the fundamental role of the alumina release rate during the formation of a geopolymer network. With respect to the two silica fumes SF F and SF M , the primary difference between them is the grain size and the degree of silicate species polymerization in the mixture [48] in accordance with the distribution of the various silica species (Q 2 , Q 3 , and Q 4 ). The silica fume SF M presents a smaller grain size than does the SF F .…”

Influence of Gd2O3 on thermal stability of oxyfluoride glasses

“…It can be an evidence that substitution of Al atoms with Gd does not cause silicate network depolymerization. On the other hands, the minor shift of 1000 cm -1 band associated with asymmetric vibrations of Si-O-Si Q 2 [25] is observed. The change in Si-O bond in the glasses doped with different content Gd 2 O 3 can be assessed by the relationship between Si-O bond strength and effective frequency as reported in the literatures [26,27].…”

The Important Role of Rubidium Hydroxide in the Synthesis of Hierarchical ZSM‐5 Zeolite Using Cetyltrimethylammonium as Structure‐Directing Agent

“…The differences between NaOH and KOH mediated syntheses can be linked to the rate of silica dissolution, which depends on the radius of the hydrated cation that stabilized the negatively charged silica network at high pH . The sodium cation is known as a water former because of its large hydrated shell of 0.36 nm .…”