Revealing the microstructure of sodium-montmorillonite aqueous suspensions
Abstract
Aqueous suspensions of geometrically anisometric (2D) sodium-montmorillonite (Na-Mt) particles display a sol-gel transition at very low solids concentrations. The underlying microstructure of the gel has remained a point of contention since the time of Irving Langmuir. An in-situ investigation encompassing length scales much larger than the individual particles is required to provide support for one of the two models proposed in the literature: 1) a percolated network governed by electrostatic attraction between platelets; and 2) a jammed suspension stabilized by repulsive electrostatic forces between particles. We settle this debate by comprehensively probing the microstructure of Na-Mt suspensions using ultra-small angle neutron/X-ray scattering and found that it is ordered and contains entities that are at least an order of magnitude larger than the individual particles. Complementary cryo-electron microscopy showed both the presence of domains having strong particle-particle ordering and regions of particle-particle aggregation. These data indicate 1) the presence of nematic domains, which refutes a purely attractive nature, and 2) assembly of particles, which refutes a purely repulsive nature. Na-Mt gels appear to have a hybrid microstructure with both attractive and repulsive domains.
Keywords
Cite
@article{arxiv.2204.01869,
title = {Revealing the microstructure of sodium-montmorillonite aqueous suspensions},
author = {Mohammad Shoaib and Shaihroz Khan and Omar B Wani and Jitendra Mata and Anthony J. Krzysko and Ivan Kuzmenko and Markus Bleuel and Lindsey K. Fiddes and Eric W. Roth and Erin R Bobicki},
journal= {arXiv preprint arXiv:2204.01869},
year = {2022}
}