Thermodynamic aspects of the adsorption of hexametaphosphate on kaolinite

Equilibrium and kinetic studies for the sorption of 3-methoxybenzaldehyde on activated kaolinites

“…This interaction can be occured with Lewis acid sites at the edge and interlameller region for thermally activated kaolinite. Similar results are reported by Castellini et al [48] for the adsorption of hexametaphosphate on kaolinite. Enhanced mesoporosity for acid activated kaolinite is also affected on the interaction between the functional groups of 3-methoxybenzaldehyde and surface and edge sites.…”

Remineralizing effect of a fluoridated gel containing sodium hexametaphosphate: An in vitro study

“…Sodium hexametaphosphate seems to facilitate the diffusion of ions during ionic exchanges (van Dijk et al, 1980), which is a consequence of its mechanism of action. Nevertheless, sodium hexametaphosphate cannot be considered as a source of phosphate that reacts spontaneously with the dental enamel, since it is not a hydrolysable compound (Choi, Wen, & Smith, 1993;Castellini, Lusvardi, Malavasi, & Menabue, 2005). Instead, it forms strong complexes with metal ions (Andreola, Castellini, Manfredini, & Romagnoli, 2004;Cochrane et al, 2008) in the oral environment, which are adsorbed by the enamel surface and the charged ions calcium fluoride and ion calcium are retained, replacing ion sodium in the cyclic structure, leading to a reticular formation (van Wazer & Campanella, 1950), by binding of ion calcium to one or more HMP molecules.…”

Fluoride toothpaste supplemented with sodium hexametaphosphate reduces enamel demineralization in vitro

“…Sodium hexametaphosphate (HMP) is a cyclic inorganic phosphate with capacity to adsorb on enamel [7] and with strong tendency to form complexes with cations [8,9]. A recent in vitro study showed that HMP improved the effects of a low-fluoride dentifrice (250 ppm F) [7].…”