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Adsorption kinetics of a fluorescent dye in a long chain fatty acid matrix Syed Arshad Hussain, Soma Banik, S. Chakraborty and D. Bhattacharjee Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Volume 79, Issue 5, September 2011, Pages 1642-1647
Abstract
This work reports the adsorption kinetics of a highly fluorescent laser dye rhodamine B (RhB) in a preformed stearic acid (SA) Langmuir monolayer. The reaction kinetics was studied by surface pressure–time (π–t) curve at constant area and in situ fluorescence imaging microscopy (FIM). Increase in surface pressure (at constant area) with time as well as increase in surface coverage of monolayer film at air–water interface provide direct evidence for the interaction. ATR–FTIR spectra also supported the interaction and consequent complexation in the complex films. UV–vis absorption and Fluorescence spectra of the complex Langmuir–Blodgett (LB) films confirm the presence of RhB molecules in the complex films transferred onto solid substrates. The outcome of this work clearly shows successful incorporation of RhB molecules into SA matrix without changing the photophysical characteristics of the dye, thus making the dye material as LB compatible.
Highlights
► Formation of stearic acid (SA) Langmuir monolayer at air–water interface. ► Injection of fluorescent laser dye rhodamine B (RhB) from the backside of the barrier. ► Monitoring the reaction kinetics by measuring surface pressure–time (π–t) curve and in situ fluorescence imaging microscopy (FIM). ► Increase in surface pressure and surface coverage of monolayer film confirm adsorption of RhB onto SA monolayer. ► ATR–FTIR and UV–vis absorption spectra of RhB–SA LB film support the adsorption.
Keywords: Langmuir monolayer; Pressure–area isotherm; Reaction kinetics; FIM; Rhodamine
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