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Updated: May 18, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Gelation via ion exchange in discotic suspensions
Ya-Wen Chang1, Andres F Mejia, Zhengdong Cheng
1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, USA.
Abstract:
The phase behavior of charged disk suspensions displays a strong dependence on ionic strengths, as the interplay between excluded volume and electrostatic interactions determines the formation of glasses, gels, and liquid crystal states. The various ions in natural soil or brine, however, could present additional effects, especially considering that most platelet structures bear a momentous ion-exchange capacity. Here we observed how ion exchange modulates and controls the interaction between individual disks and leads to unconventional phase transitions from isotropic gel to nematic gel and finally to nematic liquid crystals.
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