Surfactant concentration dependent metachromasy of an anionic cyanine dye in adsorbed and deposited Langmuir films

In-situ Brewster Angle Microscopic (BAM) images of Langmuir monolayer at the air-water interface and the UV–vis absorption and fluorescence spectra of corresponding CTAB-MC540 complex LB films fabricated below (0.7mM) and above (1.0mM) critical micellar concentration of CTAB in the aqueous subphase of the Langmuir trough.