Surfactant Molecules Intercalated in Laponite as Studied by ¹³C and ²⁹Si MAS NMR

Abstract

The structure and dynamics of surfactant molecules intercalated in Laponite have been characterized by solid-state 13 C NMR relaxation times and 13 C-and 29 Si-detected proton relaxation times. These results are compared to similar data obtained for a surfactant intercalated in montmorillonite and for different mesoporous materials. As compared with montmorillonite clay, a higher mobility and a greater percentage of the gauche conformation of the surfactant molecules are found in Laponite. The 29 Si-detected proton relaxation times in the rotating frame are sensitive to the amount of intercalated surfactant.

The interlayer swelling and molecular packing in organoclays

“…Such structures contrast with previously proposed structures of organoclays in which it was assumed that interlayer surfactants either lie flat and parallel to clay surface or are tilted at rather precise angles. The recent literature contains numerous studies using a variety of techniques that point to a rather different picture that in many ways is quite consistent with the results and interpretations presented here [9,[27][28][29][30][31].…”

Molecular Motion in Surfactant Layers Inside Polymer Composites with Synthetical Magadiite

“…Such enhanced surfactant motion was observed before for another organically modified nanosized silicate. [29] The values for daHTMA and dbHTMA powder correspond to the rigid limit for aliphatic deuterons assuming that the FWHH is 3/4 of the quadrupole coupling constant of approximately 165 kHz. For d9HTMA, motion is significant at room temperature even in the crystalline state.…”

Synthetic clay nanocomposite‐based coatings prepared by UV‐cure photopolymerization

“…40 The difficulty in observing a sharp diffraction peak for the pure clay is attributed to the very small (20 -30 nm) diameter of the clay platelets and to the poor longrange order caused by the aggregation of these platelets. 41 The diffraction peak shifted 2 ϭ 5.6°for the organically modified clay (OML) [ Fig.…”