Abstract
The interfacial tension of benzene-water interface was measured as a function of sodium lauryl sulphate concentration in presence of 0, 0,1 and 1 M sodium chloride. Analysis of pressure-area curves constructed from these data indicated qualitatively the validity of the ‘onekT’ and ‘twokT’ forms of theGibbs equation respectively for the presence and absence of neutral salt. The proposed dimerisation of lauryl sulphate ions in the bulk was shown not to affect theΠ- A curves to a large extent in the high pressure region. The limiting area per adsorbed ion was evaluated from an empirical plot. The experimental pressure was found to deviate significantly from that expected theoretically from theGouy model of the electrical double layer. This deviation was explained on the basis of the “discrete-ion-effect” proposed byBell, Levine andPethica.
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