Concentration, temperature, and pH dependence of SY aggregates

October 7, 2009

Researchers from Kent State University have used beamline 6-ID-B to measure the positional-order and correlation lengths of collumar agagates of the dye sunset yellow (SY) as functions of temperature, concentration, and ionic content. The average length of aggregates i.e., the number of SY molecules pressent in each column, was found to grow monotonically with concentration while their effective transverse separation decreased. Temperature and concentration dependence of suggests that chromonic aggregation is not an isodesmic process.