Functionalization of natural smectite-type clays by grafting with organosilanes: physico-chemical characterization and application to mercury(ii) uptake

Development and characterization of co-loaded curcumin/triazole-halloysite systems and evaluation of their potential anticancer activity

“…The frequency and assignments of each vibrational mode are based on previous halloysite reports (Yuan et al, 2008;Tonle et al, 2003;Vansant et al, 1995;White and Tripp, 2000;Madejova and Komadel, 2001;Vranken et al, 1992). Compared to p-HNT, 1 exhibits the CH 2 asymmetric and symmetric stretching at 2930 cm À1 and 2850 cm À1 respectively, the CH 2 scissoring at 1470 cm À1 and the stretching of the azido groups at 2103 cm À1 .…”

Locking effect: A novel insight in the silylation of montmorillonite surfaces

“…In the resultant hybrids, the linkage between organic components and layered silicates via covalent bonds enables a durable immobilization of the reactive organic groups, preventing their leaching in the surrounding medium when the silane grafted clays are to be used in solutions [6]. More importantly, by introducing special functional groups in the used silanes, the adsorption selectivity of the resultant materials to contaminants could be greatly improved [3], and novel clayepolymer composites with excellent mechanical property can be obtained [2,7]. Especially, in the resultant clayepolymer composites, silane is the key bridge between clay filler and polymer matrix, which provides silanol to condensate with SieOH and AleOH on the clay surface, and the introduced special functional groups (e.g.…”

Silylation of montmorillonite surfaces: Dependence on solvent nature

“…Modification of clay mineral surfaces with organic moieties has proven to be an important step for their industrial applications, such as in clay mineral-polymer nanocomposites [1,2], environmental materials [3][4][5][6], and drug delivery [7]. The methods used for modifying clay minerals mainly include exchange of the inherent interlayer cations with cationic surfactants [8,9], grafting clay minerals surfaces with silanes [10][11][12], and using silanes as silicon source in the synthesis of clay minerals [13,14].…”

“…The covalent bond enables a durable immobilization of the organic moieties, preventing their leaching into the surrounding solutions. Meanwhile, the adsorption selectivity of the silylated products to contaminants could be greatly improved by introducing special functional groups (e.g., -NH 2 , -SH) via the organosilane agents used [3][4][5][6]. On the other hand, the introduced functional groups can react with the polymer matrix, resulting in the formation of a network among clay mineral, silane, and polymer via covalent bonds.…”