Effect of Temperature Changes on Critical Micelle Concentration for Tween Series surfactant

1
dafer mahdy
dafer mahdy
2
May Essa Mahmood
May Essa Mahmood
3
Dhafer A. F. Al-Koofee
Dhafer A. F. Al-Koofee
1 Faculity of Pharmacy / kufa university

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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.

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The authors declare no conflict of interest.

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dafer mahdy. 2013. \u201cEffect of Temperature Changes on Critical Micelle Concentration for Tween Series surfactant\u201d. Global Journal of Science Frontier Research - B: Chemistry GJSFR-B Volume 13 (GJSFR Volume 13 Issue B4): .

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Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

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May 30, 2013

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English

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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.

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Effect of Temperature Changes on Critical Micelle Concentration for Tween Series surfactant

May Essa Mahmood
May Essa Mahmood
Dhafer A. F. Al-Koofee
Dhafer A. F. Al-Koofee

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