Thermal analysis evidence for the location of zwitterionic surfactant on clay minerals

Current fundamental and applied research into clay minerals in China

“…In this context, He's group of Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, has shown good examples in which the status of atoms in the octahedral and tetrahedral sites in montmorillonite and saponite is well probed (Zhu et al, 2011;Ma et al, 2015;Zhou et al, 2015). Based on such in-depth knowledge, He's group has successfully prepared a class of novel organoclays from montmorillonite and zwitterionic surfactants.…”

Structure and thermal stability of organo-vermiculite

“…266°C should be attributed to the decomposition of intercalated surfactant cations, which is similar to the decomposition temperature of neat surfactant. This is very different from the case of surfactant modified Mt , where the decomposition temperature of the intercalated surfactant cation is significantly higher than that of neat surfactant (Zhu et al, 2011;Ma et al, 2015). It is noteworthy that, for OMt prepared at low surfactant concentration (e.g., 0.2 CEC), the interlayer height of the resultant OMt (approximately 0.4 nm) (Zhu et al, 2003;He et al, 2010) is much smaller than that of the corresponding HEVrm 0.2 in the present study (approximately 1.79 nm).…”

Influence of interlayer species on the thermal characteristics of montmorillonite

“…1c). The Mt layers did not collapse due to the formation of aluminum oxide pillars within the interlayer space (Pinnavaia et al, 1985;Ma et al, 2015). Similar to Al 13 -Mt, the basal spacing of MB-Mt retained 1.40 nm at 700°C (Fig.…”