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The critical micelle concentration (CMC) for polyoxyethylene sorbitan fatty acid esters (tween) series surfactant was determined by the fluorescence intensity technique. It has been measured against concentration of micelle at temperature range (298-348) °k . at 298°k the CMC for tween (20, 21, 40, 60 and 80) were (0.0499, 0.063, 0.0333, 0.0167 and 0.015) mM respectively. The critical micelle concentration (CMC) for all tween series decreased with increasing carbon atoms number for alkyl group, but increased with increasing the number of oxyethylene group. The CMC for all tween series decreased with increasing temperature, it slightly increased at higher temperature. Thermodynamic parameters (ΔG°m, ΔH°m , ΔS°m) of the micelle formation were calculated from the temperature dependence on the CMC, ΔG°m decreased when increasing temperature above the whole temperature range . It is found that (ΔG°m, ΔH°m, ΔS°m ) decreased with increasing carbon number for alkyl group, but increased with increasing the number of oxyethylene group.
dafer mahdy, May Essa Mahmood. 2013. "Effect of Temperature Changes on Critical Micelle Concentration for Tween Series surfactant". Global Journal of Science Frontier Research - B: Chemistry GJSFR-B Volume 13 (GJSFR Volume 13 Issue B4).
Crossref Journal DOI 10.17406/GJSFR
Print ISSN 0975-5896
e-ISSN 2249-4626
v1.2
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Total Score: 146
Country: Iraq
Subject: Global Journal of Science Frontier Research
Authors: May Essa Mahmood, Dhafer A. F. Al-Koofee (PhD/Dr. count: 0)
View Count (all-time): 313
Total Views (Real + Logic): 1252
Total Downloads (simulated): 66
Publish Date: 2013 04, Fri
Monthly Totals (Real + Logic):
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