1997
DOI: 10.1021/jp9629351
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Calorimetric Study of the Micellization of n-Butoxyethanol in Water

Abstract: This paper reports on critical micelle concentrations and enthalpies of micellization of n-butoxyethanol in water at three different temperatures (5, 25, and 45°C) as determined by means of a sensitive microcalorimeter. The experimental enthalpies are compared with those calculated from the temperature dependence of the critical micelle concentration by using the phase separation model of micelle formation. Enthalpies and entropies of micelle formation are both positive and decrease as the temperature is raise… Show more

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Cited by 31 publications
(21 citation statements)
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“…For 0.1 < w BE < 0.9, a BE is almost constant, which coincides with the appearance of micellar-type supramolecular aggregates at x BE ≈ 0.02 (i.e., w BE ≈ 0.12) as observed in measurements at 25 • C by a variety of techniques including light scattering, neutron scattering and calorimetry (Darrigo et al, 1991a,b;Onori and Santucci, 1997). When w BE increases above 0.12, the added BE molecules form new aggregates or are incorporated into existing aggregates, which might be as large as 1.8-2.0 nm in radius (Darrigo et al, 1997).…”
Section: Thermodynamic Activitysupporting
confidence: 52%
“…For 0.1 < w BE < 0.9, a BE is almost constant, which coincides with the appearance of micellar-type supramolecular aggregates at x BE ≈ 0.02 (i.e., w BE ≈ 0.12) as observed in measurements at 25 • C by a variety of techniques including light scattering, neutron scattering and calorimetry (Darrigo et al, 1991a,b;Onori and Santucci, 1997). When w BE increases above 0.12, the added BE molecules form new aggregates or are incorporated into existing aggregates, which might be as large as 1.8-2.0 nm in radius (Darrigo et al, 1997).…”
Section: Thermodynamic Activitysupporting
confidence: 52%
“…butoxyethanol were measured in wider concentration range (up to 1.29 mol•kg −1 ) that extends to the region where formation of solute micelles is reported 10,11. Critical micelle concentration (CMC) decreases with increasing temperature and data published by D'Angelo et al10 for the temperature ranging from 275 to 328 K can be represented by the polynomial fit m 2 (CMC)/(mol•kg −1 ) = 1.8031 × 10 −4 (T/K) 2 − 0.12110(T/ K) + 21.061 which gives (with slight extrapolation) m 2 (CMC) in the range between 1.33 mol•kg −1 (at 278 K) and 0.73 mol•kg−1 …”
mentioning
confidence: 77%
“…[51][52][53][54][55][56][57][58] The determination of thermodynamic parameters of micellization from the cmc value is usually based on the vant Hoff equation. In the vant Hoff method, the cmc value of a surfactant is mea-A C H T U N G T R E N N U N G sured at different temperatures and the energetic parameters can be evaluated by the mass action and pseudophase models.…”
Section: Thermodynamics Of Micellizationmentioning
confidence: 99%