Sharma, Virender K. ; Bhat, Rajiv ; Ahluwalia, Jagdish C. (1987) Temperature dependence of enthalpies and heat capacities of sodium dodecyl sulfate (SDS) in water Journal of Colloid and Interface Science, 115 (2). pp. 396-401. ISSN 0021-9797
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002197...
Related URL: http://dx.doi.org/10.1016/0021-9797(87)90055-5 |
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 (ΔHm and ΔCp, m) were evaluated as a function of temperature. With the increase in temperature, ΔH in the monomeric (ΔHs0) as well as in the micellar state (ΔHs) increases, more so in case of the latter which results in a decrease in ΔHm as a function of temperature. We have observed a minimum in ΔCp, m vs T plots around 300 K which is a consequence of a maximum in heat capacities in the monomeric state (ΔCp,s0), heat capacities in the micellar state (ΔCp,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.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
ID Code: | 354 |
Deposited On: | 21 Sep 2010 04:46 |
Last Modified: | 11 May 2011 07:13 |
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