Packing behaviors of structurally different polyhedral oligomeric silsesquioxane-imidazolium surfactants in clay

The Journal of Physical Chemistry. B
Cher Ling TohXuehong Lu

Abstract

This paper reports the packing structures of two types of polyhedral oligomeric silsesquioxane (POSS)-imidazolium surfactants with different molecular rigidity in the intergalleries of montmorillonite clay. Wide-angle X-ray scattering (WAXS) and molecular modeling studies suggest that the POSS-imidazolium cations have a bilayer packing structure in clay with the long axes of the molecules largely tilted with respect to the basal plane. Direct evidence for the bilayer structure is provided by transmission electron microscopy (TEM). WAXS and differential scanning calorimetry (DSC) results indicate that the relatively flexible POSS-imidazolium cation is able to form a two-dimensionally ordered structure in the clay intergalleries, while the relatively rigid one exhibits a disordered structure in clay. Furthermore, with reducing surfactant loading, the clay modified with the rigid surfactant exhibits increased interlayer d-spacings probably because the surfactant is able to take more extended conformation at lower loadings. With its low organic content and disordered surfactant packing structure, the clay modified with the rigid surfactant also exhibits excellent thermal and thermo-oxidative stabilities.

References

May 7, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·M GelferM Rafailovich
Nov 18, 2005·Journal of Colloid and Interface Science·Seung Yeop Lee, Soo Jin Kim
Jul 21, 2006·The Journal of Physical Chemistry. B·L Mohanambe, S Vasudevan
Feb 7, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Yang Choo Chua, Xuehong Lu
Jun 9, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Douglas M FoxHugh C De Long
Mar 6, 2009·Journal of Colloid and Interface Science·Feng ZhaoBala Kandasubramanian

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Citations

Dec 12, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Jinglin TanChangqiao Zhang
Oct 18, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Jinglin Tan, Shengyu Feng
May 27, 2015·ACS Applied Materials & Interfaces·Weinan XuVladimir V Tsukruk

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