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    Clay induced changes in the aggregation pattern of Safranine-O in hybrid Langmuir-Blogdgett (LB) films

    Year: 2017

    Journal: J. Photochem. Photobiol. A-Chem., Volume 348, NOV 1, page 199–208

    Authors: Saha, Mitu; Shil, Ashis; Hussain, S. A.; Bhattacharjee, D.

    Organizations: FIST-DST Program, Govt. of India [SR/FST/PSI-191/2014]; DST, Govt. of India through Women Scientist Project [SR/WOS-A/PM-1034/2014]; CSIR through DST Fast-Track Project [SE/FTP/ PS-54/2007, 03(1146)/09/EMR-II]; DST through DST Fast-Track Project [SE/FTP/ PS-54/2007, 03(1146)/09/EMR-II]

    Keywords: Surfaces; Thin films; Multilayers; Optical properties; Surface properties; Phase transitions

    In the present communication, detailed investigation has been carried out to study the clay mineral induced changes in aggregation of a well known cationic fluorescent dye Safranine-O (SO) in aqueous solution as well as in organo-clay hybrid Langmuir-Blodgett (LB) films. At higher dye concentration in aqueous solution, Safranine-O (SO) formed both H-dimers and J-aggregates and the corresponding UVvis absorption spectra got distorted with increasing solution concentration. In clay mineral Laponite dispersed aqueous solution SO formed J-aggregates with increasing Laponite concentration resulting in an increase in fluorescence intensity. H-dimeric sites were also sufficiently decreased in organo-clay hybrid LB films of SO. UV-vis absorption and fluorescence spectroscopic as well as in-situ Brewster Angle Microscopic (BAM) studies were employed in our investigation. (C) 2017 Elsevier B.V. All rights reserved.
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