Development of new coarse-grained models for chromonic liquid crystals: insights from top-down approaches

Potter, Thomas D.; Tasche, Jos; Barrett, Elin L.; Walker, Martin; Wilson, Mark R.

Abstract

Two top-down coarse-grained molecular simulation models for a chromonic liquid crystal, 3,6,7,10,11-hexa-(1,4,7-trioxa-octyl)-triphenylene, are tested. We use an extension of the well-known MARTINI model and develop a new coarse-grained model based on statistical associating fluid theory (SAFT)-γ perturbation theory. For both models, we demonstrate self-assembly in the isotropic phase of the chromonic and we test the effectiveness of both models in terms of the structures of the chromonic aggregates that are produced in solution and the thermodynamics of association. The latter is tested by calculations of the potential of mean force for dimers in solution, which measures the strength of molecular association. SAFT-γ provides valuable insights into the thermodynamics of assembly. Exploration of a range of interactions between unlike sites demonstrates that chromonic self-assembly only occurs in a small parameter space where the hydrophilic–lipophilic balance between aromatic core and ethylene oxide chains is optimal. Outside of this balance, chromonic self-assembly is replaced by the formation of conglomerates of molecules or short stacks.

Citation

Potter, T. D., Tasche, J., Barrett, E. L., Walker, M., & Wilson, M. R. (2017). Development of new coarse-grained models for chromonic liquid crystals: insights from top-down approaches. Liquid Crystals, 44(12-13), 1979-1989. https://doi.org/10.1080/02678292.2017.1342005

• Journal Article Type: Article
• Acceptance Date: Jun 9, 2017
• Online Publication Date: Jun 25, 2017
• Publication Date: Oct 21, 2017
• Deposit Date: May 18, 2017
• Publicly Available Date: Jun 8, 2017
• Journal: Liquid Crystals
• Print ISSN: 0267-8292
• Electronic ISSN: 1366-5855
• Publisher: Taylor and Francis Group
• Peer Reviewed: Peer Reviewed
• Volume: 44
• Issue: 12-13
• Pages: 1979-1989
• DOI: https://doi.org/10.1080/02678292.2017.1342005
• Public URL: https://durham-repository.worktribe.com/output/1378717