Hectorite hydrothermal synthesis

Hectorites which include anisotropic platy silicates in the interlayers could be hydrothermally synthesized. Layer charge, silicate content, etc. could be controlled by the synthesis conditions. 

The layered silicates hectorite and magadiite were synthesized using hydrothermal procedures based on those described in 111. For hectorite which contains lithium and magnesium atoms in octahedral sites between the silicate sheets, this synthesis procedure was modified. The crystallizations were carried out at temperatures ranging from 100°C to 200°C. The compositions of the reaction mixtures (expressed as molar ratios of the oxides) were ... 

This system does not increase the carbon monoxide or soot produced during the combustion, as many commercial FRs do [233]. Other polymer silicate nanocomposites based on a variety of polymers, such as polystyrene, epoxy and polyesters, have been prepared recently by melt intercalation [236]. A direct synthesis of PVA-clay (hectorite) complexes in water solution (hydrothermal crystallization) was reported [237]. It was assumed that the driving force of this phenomenon, at least kinetically, can be described in terms of a simple diffusion reaction of polymers/monomers into clay-layered structures. 

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