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play a major role in the micelle formation. This is because
these forces are the main attractive force in the micelle
formation [37]. Also, the observed exothermicity can be
attributed to possible surfactant–solvent interactions.
Besides, the DHmꢀ values do not vary significantly with
temperature, indicating no significant variation in the
environment surrounding the hydrophobic chain of the
surfactant molecule with increasing temperature. The data
from Table 3 indicate that the negative values of DGꢀm are
mainly due to the large positive DSꢀm. DHmꢀ is much smaller
than the value of TDSꢀm; therefore, the micellization process
is governed primarily by the entropy gain associated with it.
Namely, the micellization is entropy-driven, and the driving
force for the process is the tendency of the hydrophobic
group of the surfactant to transfer from the solvent
environment to the interior of the micelle.
Acknowledgment This work was financially supported by Research
Project Supported by Shanxi Scholarship Council of China (2011-069).
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