We study phases and structures of mixtures of two representative chromonic liquid crystal materials, sunset yellow FCF (SSY) and disodium cromoglycate (DSCG), in water. A variety of combinations of isotropic, nematic (N), and columnar (also called M) phases are observed depending on their concentrations, and a phase diagram is made. We find a tendency for DSCG-rich regions to show higher-order phases while SSY-rich regions show lower-order ones. We observe uniform mesophases only when one of the materials is sparse in the N phases. Their miscibility in M phases is so low that essentially complete phase separation occurs. X-ray scattering and spectroscopy studies confirm that SSY and DSCG molecules do not mix when they form chromonic aggregates and neither do their aggregates when they form M phases.
Phases and structures of sunset yellow and disodium cromoglycate mixtures in water / A. Yamaguchi, G.P. Smith, Y. Yi, C. Xu, S. Biffi, F. Serra, T. Bellini, C. Zhu, N.A. Clark. - In: PHYSICAL REVIEW. E. - ISSN 2470-0045. - 93:1(2016 Jan 12).
|Titolo:||Phases and structures of sunset yellow and disodium cromoglycate mixtures in water|
|Parole Chiave:||statistical and nonlinear physics; statistics and probability; condensed matter physics|
|Settore Scientifico Disciplinare:||Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)|
|Data di pubblicazione:||12-gen-2016|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevE.93.012704|
|Appare nelle tipologie:||01 - Articolo su periodico|