Abstract
Enthalpies of mixing for three binary systems, sodium dodecyl sulfate (SDS)–water, hexadecyl trimethylammonium bromide (CTAB)–water, andi-C8H17C6H4O(C2H4O)9.5H (Triton X100)–water, have been measured at 302.65 K by a LKB2107-121 flow microcalorimeter equipped with a composition scanning setup. With the constructed setup we have made the step by step titration continuous by simply keeping the volumetric flow rate ratio (U1/U) of the solution with constant concentrationC1to the solution with varying concentrationCiat about one tenth. From the recorded curves, the critical micelle concentration and heat of micelle formation of surfactant have been derived. The micellar structural transition from sphere to rod for an aqueous solution containing SDS and 0.6MNaCl at 298.75 and 302.65 K can be observed directly, and the enthalpy changes of micellar transition can also be calculated.
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