Abstract
The states of water in sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/isooctane/water reverse(W/O) microemulsions system have been investigated by using Fourier transform infrared spectroscopy(FT-IR) technique. The broad peak obtained for hydroxy(O-H) of water has been resolved by least square curve-fitting. It has been observed that the water solubilized in microemulsion droplets has four states, i.e. bound water with sulfo-group, free water, bound water with sodium counterion in the water pool of microemulsion droplets and a small amount of trapped water in the palisade layer of microemulsion droplets. The following have also been determined: the aggregation number ( n ), the radius of the water pool in the microemulsions( r w ), the thickness of the bound water with sulfo-group( d 1 ), the thickness of the bound water with sodium counterion( d 2 ), the total thickness of the bound water ( d ) and the effective area of head groups of AOT( A AOT ).
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