  In this paper we have reported the reaction kinetics of nano dimensional clay
saponite and hectorite with an amphiphilic cation octadecyl rhodamine B (RhB)
in hybrid Langmuir monolayer at the air-water interface. The surface
pressure-molecular area (pi-A) isotherms were strongly influenced by the
presence of clay with the lift-off area of the cationic amphiphile shifted to
progressively larger area. In-situ infrared reflection absorption spectroscopy
(IRRAS) was used to demonstrate the reaction kinetics. Time taken to complete
the reaction kinetics for RhB-hectorite hybrid films is larger than
RhB-saponite hybrid films. Atomic force microscopic images of hybrid
Langmuir-Blodgett films give compelling visual evidence of the incorporation of
clay platelets into the hybrid films and density of which increases with the
progress of reaction kinetics.
