Abstract
The enthalpies and heat capacities of solution of an anionic surfactant sodium dodecyl sulfate (SDS) in water were determined both in the monomeric as well as in the micellar state as a function of temperature from 288.15 to 323.15 K. From these results enthalpies and heat capacities of micellization (Δ H m and Δ C p, m) were evaluated as a function of temperature. With the increase in temperature, Δ H in the monomeric (Δ H s 0) as well as in the micellar state (Δ H s) increases, more so in case of the latter which results in a decrease in Δ H m as a function of temperature. We have observed a minimum in Δ C p, m vs T plots around 300 K which is a consequence of a maximum in heat capacities in the monomeric state (Δ C p,s 0), heat capacities in the micellar state (Δ C p,s) not showing any significant temperature dependence. These results show that to understand the thermodynamics of micellization the contribution due to polar and nonpolar groups both in the monomeric as well as micellar state should be assessed.
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