“…These compounds include protonated primary, secondary or tertiary amines (Danilovtseva et al, 2011;Demadis et al, 2008;Spinde et al, 2011); amide moieties (Demadis and Neofotistou, 2007); and phosphonium (Demadis et al, 2012a, b), while the functional groups are reactive silica species. The polymers reported so far are molecules intended merely for the improvement of silica solubility; however, similar attempts for the metal-silicates aiming at metal solubility have not been examined (Topçu et al, 2017). The effect of metal cations, known as catalysts for silica polycondensation (Demadis et al, 2012a, b), on metal-silicate formation was reduced by using polymers with pendant groups that are capable of chelating metals.…”