Abstract
Mesostructured layered silicas have been prepared through a surfactant-assisted procedure using neutral alkylamines as templates and starting from atrane complexes as hydrolytic inorganic precursors. By adjusting the synthetic parameters, this kinetically controlled reproducible one-pot method allows for obtaining both pure and functionalized (inorganic or organically) lamellar silica frameworks. These are easily deconstructed and built up again, which provides a simple way for expanding the interlamellar space. The materials present high dispersibility, which results in stable colloidal suspensions.
Highlights
Materials derived from layered inorganic solids continue to attract great interest [1,2,3,4,5,6,7]
The attention paid to the MCM-50 and related lamellar silicas has been much less than that given to other M41S materials
By using alkylammonium salts as templates, this one-pot procedure allowed for obtaining hexagonal mesophases at apparent pHs values ranging approximately from 9 to 10.5 [41]
Summary
Materials derived from layered inorganic solids continue to attract great interest [1,2,3,4,5,6,7]. There is a diversity of layered solids (silicates, clay minerals, and LDH, among others) that can be tailored to promote specific properties so that they may act as “nanomaterials or as nanoreactors for fabrication of nanospecies, nanoparticles, or nanodevices” [8]. 2D atomic periodicity has been considered in some cases [13,16], the siliceous frameworks in these hybrids are typically amorphous This might be disadvantageous when compared with the use of crystalline layered silicates networks with regard to a variety of possible applications [4,5]. The preparation of the siliceous fillers requires more or less troublesome multi-step processes [4,5,28,29]
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