Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 116, Issue 45, Pages 13506-13515Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp306135w
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Funding
- American Chemical Society Petroleum Research Fund
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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IR-806 is a near-infrared cyanine dye that forms assemblies in aqueous solutions which in turn orientationally order into a liquid crystal phase at concentrations as low as 0.5 wt %. Unlike many chromonic liquid crystals, the absorption spectrum of IR-806 changes dramatically with concentration, showing an isodesmic assembly process at lower :concentrations followed by a second process at higher concentration that is not isodesmic. The lower concentration assembly process is characterized by a free energy change per molecule of about 9 k(B)T, not unlike other chromonic systems. However, X-ray scattering measurements suggest that the assemblies that form during the higher concentration process are much larger than what is observed for many chromonic liquid crystals. Although there is a transitional region between the liquid crystal and isotropic phases of 10-15 degrees C, unlike most chromonic liquid crystals, no biphasic region is observed using polarizing microscopy.
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